<XBRL>
<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.lpl.com/role/AcquisitionsDetails" xlink:href="lpla-20111231.xsd#AcquisitionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/AcquisitionsDetails1" xlink:href="lpla-20111231.xsd#AcquisitionsDetails1" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/AcquisitionsDetailsTextuals" xlink:href="lpla-20111231.xsd#AcquisitionsDetailsTextuals" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/CommitmentsAndContingenciesDetailsTextuals" xlink:href="lpla-20111231.xsd#CommitmentsAndContingenciesDetailsTextuals" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="lpla-20111231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ConsolidatedStatementsOfFinancialCondition" xlink:href="lpla-20111231.xsd#ConsolidatedStatementsOfFinancialCondition" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ConsolidatedStatementsOfFinancialConditionParenthetical" xlink:href="lpla-20111231.xsd#ConsolidatedStatementsOfFinancialConditionParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ConsolidatedStatementsOfOperations" xlink:href="lpla-20111231.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:href="lpla-20111231.xsd#ConsolidatedStatementsOfStockholdersEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical" xlink:href="lpla-20111231.xsd#ConsolidatedStatementsOfStockholdersEquityParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/DocumentAndEntityInformation" xlink:href="lpla-20111231.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/EarningsPerShareDetailsTextuals" xlink:href="lpla-20111231.xsd#EarningsPerShareDetailsTextuals" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/FairValueMeasurementsChangesInLevel3RecurringFairValueMeasurementsDetails" xlink:href="lpla-20111231.xsd#FairValueMeasurementsChangesInLevel3RecurringFairValueMeasurementsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/FairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisDetails" xlink:href="lpla-20111231.xsd#FairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/GoodwillAndIntangibleAssetsDetails" xlink:href="lpla-20111231.xsd#GoodwillAndIntangibleAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/GoodwillAndIntangibleAssetsGoodwillDetails" xlink:href="lpla-20111231.xsd#GoodwillAndIntangibleAssetsGoodwillDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/HeldToMaturitySecuritiesDetails" xlink:href="lpla-20111231.xsd#HeldToMaturitySecuritiesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/HeldToMaturitySecuritiesDetails1" xlink:href="lpla-20111231.xsd#HeldToMaturitySecuritiesDetails1" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/IncomeTaxesDetailsTextuals" xlink:href="lpla-20111231.xsd#IncomeTaxesDetailsTextuals" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/IndebtednessDetails" xlink:href="lpla-20111231.xsd#IndebtednessDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/IndebtednessDetailsTextuals" xlink:href="lpla-20111231.xsd#IndebtednessDetailsTextuals" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/IntangibleAssetsDetails1" xlink:href="lpla-20111231.xsd#IntangibleAssetsDetails1" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/NetCapitalAndRegulatoryRequirementsDetails" xlink:href="lpla-20111231.xsd#NetCapitalAndRegulatoryRequirementsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/OrganizationAndDescriptionOfCompanyDetails" xlink:href="lpla-20111231.xsd#OrganizationAndDescriptionOfCompanyDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/RelatedPartyTransactions" xlink:href="lpla-20111231.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/RelatedPartyTransactionsDetails" xlink:href="lpla-20111231.xsd#RelatedPartyTransactionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/RestructuringTableDetails" xlink:href="lpla-20111231.xsd#RestructuringTableDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ShareBasedCompensationDetails" xlink:href="lpla-20111231.xsd#ShareBasedCompensationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ShareBasedCompensationDetails2" xlink:href="lpla-20111231.xsd#ShareBasedCompensationDetails2" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ShareBasedCompensationDetails3" xlink:href="lpla-20111231.xsd#ShareBasedCompensationDetails3" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/ShareBasedCompensationDetailsTextuals" xlink:href="lpla-20111231.xsd#ShareBasedCompensationDetailsTextuals" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsDetails" xlink:href="lpla-20111231.xsd#SummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesDraftsPayableDetails" xlink:href="lpla-20111231.xsd#SummaryOfSignificantAccountingPoliciesDraftsPayableDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesFixedAssetsDetails" xlink:href="lpla-20111231.xsd#SummaryOfSignificantAccountingPoliciesFixedAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesOtherOperatingExpenseDetails" xlink:href="lpla-20111231.xsd#SummaryOfSignificantAccountingPoliciesOtherOperatingExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesReceivablesFromAndPayablesToClientsDetails" xlink:href="lpla-20111231.xsd#SummaryOfSignificantAccountingPoliciesReceivablesFromAndPayablesToClientsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesReceivablesFromOthersDetails" xlink:href="lpla-20111231.xsd#SummaryOfSignificantAccountingPoliciesReceivablesFromOthersDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesSecuritiesBorrowedAndLoanedDetails" xlink:href="lpla-20111231.xsd#SummaryOfSignificantAccountingPoliciesSecuritiesBorrowedAndLoanedDetails" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <definitionLink xlink:role="http://www.lpl.com/role/AcquisitionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_C458C795D0012D0F9A95202D702E0EF4" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_CB84192701D810013558202D702E8917" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C458C795D0012D0F9A95202D702E0EF4" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_CB84192701D810013558202D702E8917" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_DC8ACB281C0D61B6CFC1202D702EDC8C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_CB84192701D810013558202D702E8917" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_DC8ACB281C0D61B6CFC1202D702EDC8C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69159403A32EAD7A1C13202D702E040C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_DC8ACB281C0D61B6CFC1202D702EDC8C" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69159403A32EAD7A1C13202D702E040C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69159403A32EAD7A1C13202D702E040C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_DC8ACB281C0D61B6CFC1202D702EDC8C" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69159403A32EAD7A1C13202D702E040C" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ConcordCapitalPartnersMember" xlink:label="loc_lpla_ConcordCapitalPartnersMember_6A4628371DE02639EC52202D702E39AB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69159403A32EAD7A1C13202D702E040C" xlink:to="loc_lpla_ConcordCapitalPartnersMember_6A4628371DE02639EC52202D702E39AB" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_NationalRetirementPartnersMember" xlink:label="loc_lpla_NationalRetirementPartnersMember_3B3303F6083A75D80030202D702E7EB0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69159403A32EAD7A1C13202D702E040C" xlink:to="loc_lpla_NationalRetirementPartnersMember_3B3303F6083A75D80030202D702E7EB0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ProductSponsorRelationshipsMember" xlink:label="loc_lpla_ProductSponsorRelationshipsMember_3BE19C2EEF4ECA6B35F6202D702E95AA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69159403A32EAD7A1C13202D702E040C" xlink:to="loc_lpla_ProductSponsorRelationshipsMember_3BE19C2EEF4ECA6B35F6202D702E95AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C458C795D0012D0F9A95202D702E0EF4" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_669D59A6E6392179409A202D702EF070" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_669D59A6E6392179409A202D702EF070" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables_ACE4B0C035E311F229CA202D702E2712" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsReceivables_ACE4B0C035E311F229CA202D702E2712" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsOtherAssets" xlink:label="loc_lpla_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsOtherAssets_A0C1317862DBE851F155202D702E50F1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_lpla_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsOtherAssets_A0C1317862DBE851F155202D702E50F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_6B4D3CBDB46ED8D57080202D702E2708" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_6B4D3CBDB46ED8D57080202D702E2708" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationNoncurrentAssets" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationNoncurrentAssets_E8FD760345C1604BC57F202D702E8A80" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationNoncurrentAssets_E8FD760345C1604BC57F202D702E8A80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_344D5F07FA740FE58640202D702E14B9" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities_344D5F07FA740FE58640202D702E14B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet_F2A828DC48035421A2E9202D702E3B3D" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet_F2A828DC48035421A2E9202D702E3B3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLifeAverage" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLifeAverage_DC1949E84B0AEF29AAFB84C659C42F24" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAbstract_FB3DE52CA6D4BC220A02202D702E489D" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLifeAverage_DC1949E84B0AEF29AAFB84C659C42F24" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAbstract" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAbstract_20E691D956F8F105E052202D702E37AE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C458C795D0012D0F9A95202D702E0EF4" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAbstract_20E691D956F8F105E052202D702E37AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid_A19DC7405B46EB44F6F6202D702EC6E0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAbstract_20E691D956F8F105E052202D702E37AE" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid_A19DC7405B46EB44F6F6202D702EC6E0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionCostOfAcquiredEntityCashPlacedInEscrow" xlink:label="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityCashPlacedInEscrow_27A960D87F2A19A62263202D702E45E1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAbstract_20E691D956F8F105E052202D702E37AE" xlink:to="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityCashPlacedInEscrow_27A960D87F2A19A62263202D702E45E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionContingentConsiderationAtFairValue" xlink:label="loc_us-gaap_BusinessAcquisitionContingentConsiderationAtFairValue_7F63DE663110D8B95CCF202D702EEE22" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAbstract_20E691D956F8F105E052202D702E37AE" xlink:to="loc_us-gaap_BusinessAcquisitionContingentConsiderationAtFairValue_7F63DE663110D8B95CCF202D702EEE22" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/AcquisitionsDetails1" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_DE32C3BD98CB7C901857202D710987C4" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_91D0C65B69CBB9E35A56202D71093CF9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_DE32C3BD98CB7C901857202D710987C4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_91D0C65B69CBB9E35A56202D71093CF9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9DC8209F660FAF5674F3202D71097944" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_91D0C65B69CBB9E35A56202D71093CF9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9DC8209F660FAF5674F3202D71097944" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_81FC7D53E440A4101C85202D710905A2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9DC8209F660FAF5674F3202D71097944" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_81FC7D53E440A4101C85202D710905A2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_81FC7D53E440A4101C85202D710905A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9DC8209F660FAF5674F3202D71097944" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_81FC7D53E440A4101C85202D710905A2" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ConcordCapitalPartnersMember" xlink:label="loc_lpla_ConcordCapitalPartnersMember_E33121B9EE678A548CD4202D71095FCC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_81FC7D53E440A4101C85202D710905A2" xlink:to="loc_lpla_ConcordCapitalPartnersMember_E33121B9EE678A548CD4202D71095FCC" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_NationalRetirementPartnersMember" xlink:label="loc_lpla_NationalRetirementPartnersMember_293FC639651266A6FCCF202D7109E948" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_81FC7D53E440A4101C85202D710905A2" xlink:to="loc_lpla_NationalRetirementPartnersMember_293FC639651266A6FCCF202D7109E948" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis_8A4E6CE06859F0581888202D710968EA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_91D0C65B69CBB9E35A56202D71093CF9" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis_8A4E6CE06859F0581888202D710968EA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5ECA903738EAD10A364202D7109849B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis_8A4E6CE06859F0581888202D710968EA" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5ECA903738EAD10A364202D7109849B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5ECA903738EAD10A364202D7109849B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsByMajorClassAxis_8A4E6CE06859F0581888202D710968EA" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5ECA903738EAD10A364202D7109849B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_2AB8D1AD8E6C2337172D202D71091776" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5ECA903738EAD10A364202D7109849B" xlink:to="loc_us-gaap_CustomerRelationshipsMember_2AB8D1AD8E6C2337172D202D71091776" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AdvisorRelationshipsMember" xlink:label="loc_lpla_AdvisorRelationshipsMember_00271504723535778FEF202D7109F575" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5ECA903738EAD10A364202D7109849B" xlink:to="loc_lpla_AdvisorRelationshipsMember_00271504723535778FEF202D7109F575" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ProductSponsorRelationshipsMember" xlink:label="loc_lpla_ProductSponsorRelationshipsMember_AA3ACAC654E70343E791202D7109A890" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_C5ECA903738EAD10A364202D7109849B" xlink:to="loc_lpla_ProductSponsorRelationshipsMember_AA3ACAC654E70343E791202D7109A890" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife_F009E245C501C1D3C9A6202D710985A7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_DE32C3BD98CB7C901857202D710987C4" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife_F009E245C501C1D3C9A6202D710985A7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_47B653D22EC837373388202D7109FE19" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_DE32C3BD98CB7C901857202D710987C4" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets_47B653D22EC837373388202D7109FE19" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/AcquisitionsDetailsTextuals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_85A3F061624253F57EA7E2C80AA2AA72" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_23474726B5D15DD329FA85815F6CE1E4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85A3F061624253F57EA7E2C80AA2AA72" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_23474726B5D15DD329FA85815F6CE1E4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_95B5CA0B28C53E3BEEBAE2C80A92A5E7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_23474726B5D15DD329FA85815F6CE1E4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_95B5CA0B28C53E3BEEBAE2C80A92A5E7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_78CD58C04723F8F043A1E2C80A92C0C7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_95B5CA0B28C53E3BEEBAE2C80A92A5E7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_78CD58C04723F8F043A1E2C80A92C0C7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_78CD58C04723F8F043A1E2C80A92C0C7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_95B5CA0B28C53E3BEEBAE2C80A92A5E7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_78CD58C04723F8F043A1E2C80A92C0C7" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_NationalRetirementPartnersMember" xlink:label="loc_lpla_NationalRetirementPartnersMember_A8A476311DFDF19E81ECE2C80A923609" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_78CD58C04723F8F043A1E2C80A92C0C7" xlink:to="loc_lpla_NationalRetirementPartnersMember_A8A476311DFDF19E81ECE2C80A923609" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ConcordCapitalPartnersMember" xlink:label="loc_lpla_ConcordCapitalPartnersMember_7280ACB3203A2760B302E2C80A923979" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_78CD58C04723F8F043A1E2C80A92C0C7" xlink:to="loc_lpla_ConcordCapitalPartnersMember_7280ACB3203A2760B302E2C80A923979" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_85A3F061624253F57EA7E2C80AA2AA72" xlink:to="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid_5EBC2E31FB1B762ACFF4E2C80AA2D675" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid_5EBC2E31FB1B762ACFF4E2C80AA2D675" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionCostOfAcquiredEntityCashPlacedInEscrow" xlink:label="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityCashPlacedInEscrow_E8FFFC43C87C0E3CA2A3E2C80AA2CC79" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityCashPlacedInEscrow_E8FFFC43C87C0E3CA2A3E2C80AA2CC79" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionCostOfAcquiredEntityAdditionalConsideration" xlink:label="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityAdditionalConsideration_F864A40178392AF47A0AE2C80AA237C1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityAdditionalConsideration_F864A40178392AF47A0AE2C80AA237C1" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionCostOfAcquiredEntityAdditionalConsiderationAndEscrowPayment" xlink:label="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityAdditionalConsiderationAndEscrowPayment_3BD903DABDA40CFD6332E2C80AA2763B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityAdditionalConsiderationAndEscrowPayment_3BD903DABDA40CFD6332E2C80AA2763B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionCostOfAcquiredEntityCashPaidOutOfEscrow" xlink:label="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityCashPaidOutOfEscrow_FF67BBB4FB53AAD206D8B20FB9EE97ED" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityCashPaidOutOfEscrow_FF67BBB4FB53AAD206D8B20FB9EE97ED" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_EstimateOfFutureContingentConsideration" xlink:label="loc_lpla_EstimateOfFutureContingentConsideration_1CB579E821688EC8F8B4E2C80AA2CA9D" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_EstimateOfFutureContingentConsideration_1CB579E821688EC8F8B4E2C80AA2CA9D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AdvancePaymentsForContingentConsideration" xlink:label="loc_lpla_AdvancePaymentsForContingentConsideration_70666A9671A77BEEF99BE2C80AA2D2E4" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_AdvancePaymentsForContingentConsideration_70666A9671A77BEEF99BE2C80AA2D2E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionContingentConsiderationAtFairValue" xlink:label="loc_us-gaap_BusinessAcquisitionContingentConsiderationAtFairValue_3FFB534C0AB41FAFD18EE2C80AA2B997" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_us-gaap_BusinessAcquisitionContingentConsiderationAtFairValue_3FFB534C0AB41FAFD18EE2C80AA2B997" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AdvancePaymentsForContingentConsiderationAndFairValueOfContingentConsideration" xlink:label="loc_lpla_AdvancePaymentsForContingentConsiderationAndFairValueOfContingentConsideration_C761E414DBC2991FF2C2E2D9C4C7BE51" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_AdvancePaymentsForContingentConsiderationAndFairValueOfContingentConsideration_C761E414DBC2991FF2C2E2D9C4C7BE51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice_79704F1CCC517370508D8D275D7F1509" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice_79704F1CCC517370508D8D275D7F1509" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionCostOfAcquiredEntityTransactionCostCurrentPeriod" xlink:label="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityTransactionCostCurrentPeriod_737B1A50D7B1712B027AE2C80AA26C85" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityTransactionCostCurrentPeriod_737B1A50D7B1712B027AE2C80AA26C85" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_MaximumAmountOfContingentConsideration" xlink:label="loc_lpla_MaximumAmountOfContingentConsideration_A37E731E9982E9F58A4FE2C80AA2024E" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_MaximumAmountOfContingentConsideration_A37E731E9982E9F58A4FE2C80AA2024E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet_6A2EB1C0B165A4793185828B24C39904" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet_6A2EB1C0B165A4793185828B24C39904" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BusinessAcquisitionCostOfAcquiredEntityTotalTransactionCostOverTransactionPeriod" xlink:label="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityTotalTransactionCostOverTransactionPeriod_7C7D783F52514DA21BA7B1E96DCBAE1B" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_288F1A0879CDBB535269E2C80AA25E47" xlink:to="loc_lpla_BusinessAcquisitionCostOfAcquiredEntityTotalTransactionCostOverTransactionPeriod_7C7D783F52514DA21BA7B1E96DCBAE1B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/CommitmentsAndContingenciesDetailsTextuals" xlink:type="extended">
    <loc xlink:href="lpla-20111231.xsd#lpla_CommitmentsAndContingenciesLineItems" xlink:label="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:type="locator" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CommitmentsAndContingenciesTable" xlink:label="loc_lpla_CommitmentsAndContingenciesTable_11BC28E814B0B7369473847C65542C7C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_lpla_CommitmentsAndContingenciesTable_11BC28E814B0B7369473847C65542C7C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CollateralReceivedFromClientByThirdPartyPledgeRecipientAxis" xlink:label="loc_lpla_CollateralReceivedFromClientByThirdPartyPledgeRecipientAxis_D9DA0997882072D3ACEB84794C9968E4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_CommitmentsAndContingenciesTable_11BC28E814B0B7369473847C65542C7C" xlink:to="loc_lpla_CollateralReceivedFromClientByThirdPartyPledgeRecipientAxis_D9DA0997882072D3ACEB84794C9968E4" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_PledgeRecipientDomain" xlink:label="loc_lpla_PledgeRecipientDomain_7AFE7EEC393E3AF17B47847A42A4560D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_CollateralReceivedFromClientByThirdPartyPledgeRecipientAxis_D9DA0997882072D3ACEB84794C9968E4" xlink:to="loc_lpla_PledgeRecipientDomain_7AFE7EEC393E3AF17B47847A42A4560D_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_PledgeRecipientDomain" xlink:label="loc_lpla_PledgeRecipientDomain_7AFE7EEC393E3AF17B47847A42A4560D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_CollateralReceivedFromClientByThirdPartyPledgeRecipientAxis_D9DA0997882072D3ACEB84794C9968E4" xlink:to="loc_lpla_PledgeRecipientDomain_7AFE7EEC393E3AF17B47847A42A4560D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_OptionsClearingCorporationMember" xlink:label="loc_lpla_OptionsClearingCorporationMember_8A2E40CC92BC746517E1847E6FB84B0A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_PledgeRecipientDomain_7AFE7EEC393E3AF17B47847A42A4560D" xlink:to="loc_lpla_OptionsClearingCorporationMember_8A2E40CC92BC746517E1847E6FB84B0A" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_NationalSecuritiesClearingCorporationMember" xlink:label="loc_lpla_NationalSecuritiesClearingCorporationMember_28A35A1F8491FECCEBE3847F9486F2C7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_PledgeRecipientDomain_7AFE7EEC393E3AF17B47847A42A4560D" xlink:to="loc_lpla_NationalSecuritiesClearingCorporationMember_28A35A1F8491FECCEBE3847F9486F2C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals_8ED5F82D2B84F6A83909202D9D88F4CC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals_8ED5F82D2B84F6A83909202D9D88F4CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OperatingLeasesRentExpenseNet" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseNet_2BFEB54DAF35E33AAE8F202D9D888BCC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_us-gaap_OperatingLeasesRentExpenseNet_2BFEB54DAF35E33AAE8F202D9D888BCC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LitigationSettlementExpense" xlink:label="loc_us-gaap_LitigationSettlementExpense_CD75AA987D0C721D1268844BF2229118" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_us-gaap_LitigationSettlementExpense_CD75AA987D0C721D1268844BF2229118" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingencyRelatedReceivableCarryingValue" xlink:label="loc_us-gaap_LossContingencyRelatedReceivableCarryingValue_8DEAC62000EEADBC5D5D8453F80FCF58" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_us-gaap_LossContingencyRelatedReceivableCarryingValue_8DEAC62000EEADBC5D5D8453F80FCF58" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SettlementValuationAllowance" xlink:label="loc_lpla_SettlementValuationAllowance_16CF8F4E88A26DE0D4BD8459F4385D3D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_lpla_SettlementValuationAllowance_16CF8F4E88A26DE0D4BD8459F4385D3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingencyRelatedReceivableCarryingValueReceipts" xlink:label="loc_us-gaap_LossContingencyRelatedReceivableCarryingValueReceipts_09EAFA46BF0952CD7B998455B1279179" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_us-gaap_LossContingencyRelatedReceivableCarryingValueReceipts_09EAFA46BF0952CD7B998455B1279179" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_UnfundedLoanCommitments" xlink:label="loc_lpla_UnfundedLoanCommitments_74026E5B6C2D1CABA132202D9D881931" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_lpla_UnfundedLoanCommitments_74026E5B6C2D1CABA132202D9D881931" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_NumberOfArbitrationsSettled" xlink:label="loc_lpla_NumberOfArbitrationsSettled_DEA1B043BBBB4A741298202D9D884BFB" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_lpla_NumberOfArbitrationsSettled_DEA1B043BBBB4A741298202D9D884BFB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LegalFees" xlink:label="loc_us-gaap_LegalFees_F3BA6E7FBF53F0DDA3BA202D9D8871BA" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_us-gaap_LegalFees_F3BA6E7FBF53F0DDA3BA202D9D8871BA" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_OtherCommitmentsAbstract" xlink:label="loc_lpla_OtherCommitmentsAbstract_793AD47891DBF8925B3384825174BA21" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_CommitmentsAndContingenciesLineItems_0401854F992C7AC0F67D847D82474CED" xlink:to="loc_lpla_OtherCommitmentsAbstract_793AD47891DBF8925B3384825174BA21" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue" xlink:label="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue_F8C0B8861945997D13C2202D9D885219" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_OtherCommitmentsAbstract_793AD47891DBF8925B3384825174BA21" xlink:to="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue_F8C0B8861945997D13C2202D9D885219" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValueOfSecuritiesSoldOrRepledged" xlink:label="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValueOfSecuritiesSoldOrRepledged_14644307EE99540D6A4B202D9D88FCC4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_OtherCommitmentsAbstract_793AD47891DBF8925B3384825174BA21" xlink:to="loc_us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValueOfSecuritiesSoldOrRepledged_14644307EE99540D6A4B202D9D88FCC4" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CollateralSecurityPledgedInBank" xlink:label="loc_lpla_CollateralSecurityPledgedInBank_3348D49A57C8794AB6C3202D9D88B6F0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_OtherCommitmentsAbstract_793AD47891DBF8925B3384825174BA21" xlink:to="loc_lpla_CollateralSecurityPledgedInBank_3348D49A57C8794AB6C3202D9D88B6F0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeRemainingUnpledgedAmount" xlink:label="loc_lpla_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeRemainingUnpledgedAmount_ACCEAB849084644166CA8486C37FDEED" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_OtherCommitmentsAbstract_793AD47891DBF8925B3384825174BA21" xlink:to="loc_lpla_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeRemainingUnpledgedAmount_ACCEAB849084644166CA8486C37FDEED" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_35F25C16FB04D739C0ADF81CE8443768" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_StatementTable_35F25C16FB04D739C0ADF81CE8443768" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_98448570CAF488F6CA1284EB2316838D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_35F25C16FB04D739C0ADF81CE8443768" xlink:to="loc_us-gaap_StatementScenarioAxis_98448570CAF488F6CA1284EB2316838D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_DEF0CADC01B659EC929D84EB231C21C7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_98448570CAF488F6CA1284EB2316838D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_DEF0CADC01B659EC929D84EB231C21C7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_DEF0CADC01B659EC929D84EB231C21C7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_98448570CAF488F6CA1284EB2316838D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_DEF0CADC01B659EC929D84EB231C21C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5F58DDCFEF6884412F67202D67B3EE14" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5F58DDCFEF6884412F67202D67B3EE14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_245DC922658D8791D228202D67B38B1F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5F58DDCFEF6884412F67202D67B3EE14" xlink:to="loc_us-gaap_NetIncomeLoss_245DC922658D8791D228202D67B38B1F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_260267F9A9160BFFB112202D67B35ECF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5F58DDCFEF6884412F67202D67B3EE14" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_260267F9A9160BFFB112202D67B35ECF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_260267F9A9160BFFB112202D67B35ECF" xlink:to="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_636662680D6EDB7698DD202D67B39AB9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_DepreciationAndAmortization_636662680D6EDB7698DD202D67B39AB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_DBBEC5CF1761E6B4D57C202D67B32E30" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_DBBEC5CF1761E6B4D57C202D67B32E30" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_2BE578DBBD1477D2AC41202D67B35AB9" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_2BE578DBBD1477D2AC41202D67B35AB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_70E74EAD413E538BE77E202D67B3B1F1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets_70E74EAD413E538BE77E202D67B3B1F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_1240873AD38CB47392A1202D67B3E9CF" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_ShareBasedCompensation_1240873AD38CB47392A1202D67B3E9CF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_B179FC1F1D727C91C21D202D67B31EEC" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_B179FC1F1D727C91C21D202D67B31EEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_387BA6A991E6771B228E202D67B3182E" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_387BA6A991E6771B228E202D67B3182E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_D82A5E2DD634FAF06DF0202D67B3BCCB" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_D82A5E2DD634FAF06DF0202D67B3BCCB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_ABC482E5F4A82C6CF5C0202D67B39553" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_ABC482E5F4A82C6CF5C0202D67B39553" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_3E13DF9D9A23FBC16647202D67B307B6" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_3E13DF9D9A23FBC16647202D67B307B6" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LeaseAbandonment" xlink:label="loc_lpla_LeaseAbandonment_D69A2EA87D8DB93E6066202D67B36769" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_lpla_LeaseAbandonment_D69A2EA87D8DB93E6066202D67B36769" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LoanForgiveness" xlink:label="loc_lpla_LoanForgiveness_59B525E30C523885B654202D67B308E7" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_lpla_LoanForgiveness_59B525E30C523885B654202D67B308E7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_5513A6B3DF27DD19AC18202D67B33E62" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C3C65584FB47FF78DFF9202D67B3B0B0" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_5513A6B3DF27DD19AC18202D67B33E62" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_260267F9A9160BFFB112202D67B35ECF" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsChangesInOperatingAssetsAndLiabilities" xlink:label="loc_lpla_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsChangesInOperatingAssetsAndLiabilities_4DDF54031032601EF111202D67B3FB32" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_lpla_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsChangesInOperatingAssetsAndLiabilities_4DDF54031032601EF111202D67B3FB32" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IncreaseDecreaseReceivablesFromClients" xlink:label="loc_lpla_IncreaseDecreaseReceivablesFromClients_B6F0E243A5785748DB6F202D67B32322" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_lpla_IncreaseDecreaseReceivablesFromClients_B6F0E243A5785748DB6F202D67B32322" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInBrokerageReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInBrokerageReceivables_C22DCD66C9FCA907E383202D67B3C467" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInBrokerageReceivables_C22DCD66C9FCA907E383202D67B3C467" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInOtherReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherReceivables_7122DD5CA80F0D1F7CDF202D67B3EF1D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherReceivables_7122DD5CA80F0D1F7CDF202D67B3EF1D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInTradingSecurities" xlink:label="loc_us-gaap_IncreaseDecreaseInTradingSecurities_AC68963A8CED74ABC48C202D67B341A2" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInTradingSecurities_AC68963A8CED74ABC48C202D67B341A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInSecuritiesBorrowed" xlink:label="loc_us-gaap_IncreaseDecreaseInSecuritiesBorrowed_2447578D6EDE442377EC202D67B3AE36" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInSecuritiesBorrowed_2447578D6EDE442377EC202D67B3AE36" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_3A7AE3F73B788EAD552B202D67B38B26" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_3A7AE3F73B788EAD552B202D67B38B26" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_DraftsPayableChangesInOperatingAssetsAndLiabilities" xlink:label="loc_lpla_DraftsPayableChangesInOperatingAssetsAndLiabilities_6DF9925E1825BB0C9E79202D67B3EC37" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_lpla_DraftsPayableChangesInOperatingAssetsAndLiabilities_6DF9925E1825BB0C9E79202D67B3EC37" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IncreaseDecreasePayablesToClients" xlink:label="loc_lpla_IncreaseDecreasePayablesToClients_F6EC62E10A1880F17D6DF82C6F2E9CCF" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_lpla_IncreaseDecreasePayablesToClients_F6EC62E10A1880F17D6DF82C6F2E9CCF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInPayablesToBrokerDealers" xlink:label="loc_us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_0F2D898F1306C26F727F202D67B332E1" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_0F2D898F1306C26F727F202D67B332E1" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ChangesInAccruedCommissionsAndAdvisoryFeesPayable" xlink:label="loc_lpla_ChangesInAccruedCommissionsAndAdvisoryFeesPayable_305388BD56EB1EC66E1F202D67B3B722" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_lpla_ChangesInAccruedCommissionsAndAdvisoryFeesPayable_305388BD56EB1EC66E1F202D67B3B722" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E20DB8509559D3E2D0BB202D67B39516" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_E20DB8509559D3E2D0BB202D67B39516" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_FC75E5C72C30B9A6BE8E202D67B31006" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_FC75E5C72C30B9A6BE8E202D67B31006" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_161FEB86B1C90B170AF3202D67B33256" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_161FEB86B1C90B170AF3202D67B33256" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased" xlink:label="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased_334004E2EF4FC435DC18202D67B37EE7" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_4B635A7A8253695EDCC7202D67B33985" xlink:to="loc_us-gaap_IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased_334004E2EF4FC435DC18202D67B37EE7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_72A20BE556AECF0DEAF1202D67B3473C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5F58DDCFEF6884412F67202D67B3EE14" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_72A20BE556AECF0DEAF1202D67B3473C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_C6869D3A0F9616857A28202D67B35F0D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_C6869D3A0F9616857A28202D67B35F0D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_1DAA81F7A9C80CC9A59D202D67B3492E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_1DAA81F7A9C80CC9A59D202D67B3492E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_DB749B818C74DF7A0B45202D67B32466" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_DB749B818C74DF7A0B45202D67B32466" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities_648B549DCFCB4BF2CCAA202D67B33641" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities_648B549DCFCB4BF2CCAA202D67B33641" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_92B1910523F2F7360D39202D67B3F874" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_92B1910523F2F7360D39202D67B3F874" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_DepositsOfRestrictedCash" xlink:label="loc_lpla_DepositsOfRestrictedCash_71E5B3048A43024F3F1F202D67B38AD0" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_lpla_DepositsOfRestrictedCash_71E5B3048A43024F3F1F202D67B38AD0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReleaseOfRestrictedCash" xlink:label="loc_lpla_ReleaseOfRestrictedCash_D99D13E6D856E90E2038202D67B3394E" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_lpla_ReleaseOfRestrictedCash_D99D13E6D856E90E2038202D67B3394E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_07936EAE64BB8D3415E4202D67B36296" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_07936EAE64BB8D3415E4202D67B36296" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1EA4F2616F17C38F3632202D67B3883F" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_D73D6DB0782FEDDFC133202D67B350BD" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1EA4F2616F17C38F3632202D67B3883F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_B2383E83A3A878C535B3202D67B3E3DB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_B2383E83A3A878C535B3202D67B3E3DB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_634B2A2EDF25E5E88E7B202D67B3CEDA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_634B2A2EDF25E5E88E7B202D67B3CEDA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_1E99E88E8EE6A1ABF35B202D67B33C59" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_1E99E88E8EE6A1ABF35B202D67B33C59" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RepaymentsOfSubordinatedDebt" xlink:label="loc_us-gaap_RepaymentsOfSubordinatedDebt_97E12D4C3CDE02B87F3F202D67B38F01" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_RepaymentsOfSubordinatedDebt_97E12D4C3CDE02B87F3F202D67B38F01" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_5F04284948BFC269EB10202D67B34082" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_5F04284948BFC269EB10202D67B34082" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_8B9430981CCE0A451F3D202D67B31D96" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_8B9430981CCE0A451F3D202D67B31D96" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RepaymentOfStockholderLoans" xlink:label="loc_lpla_RepaymentOfStockholderLoans_5A8E82AA701B6EA8F19E202D67B36047" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_lpla_RepaymentOfStockholderLoans_5A8E82AA701B6EA8F19E202D67B36047" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_FF92F70C47BB3808AB4E202D67B39BEE" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_FF92F70C47BB3808AB4E202D67B39BEE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_5E8D12F9D635334EDCAE202D67B34B3D" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_5E8D12F9D635334EDCAE202D67B34B3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_A6E51F738ADE0D3571FB202D67B339EF" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_A6E51F738ADE0D3571FB202D67B339EF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_CE34A0F716FD835D57FE202D67B32A7D" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_EC992730A700EFD58AC7202D67B3BB01" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_CE34A0F716FD835D57FE202D67B32A7D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_9C9F7744867ACDB92DEA202D67B32C27" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_9C9F7744867ACDB92DEA202D67B32C27" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_FF59DA6CBF28F2EE2516202D67B36772" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_FF59DA6CBF28F2EE2516202D67B36772" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_EC75BFBA5EC9D9840A3B202D67B3488D" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_EC75BFBA5EC9D9840A3B202D67B3488D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_us-gaap_InterestPaid_273C0EB9A95B27ED8A49202D67B3C31C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_EC75BFBA5EC9D9840A3B202D67B3488D" xlink:to="loc_us-gaap_InterestPaid_273C0EB9A95B27ED8A49202D67B3C31C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:label="loc_us-gaap_IncomeTaxesPaid_A827EB04E9FE7B78E36A202D67B39BA3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_EC75BFBA5EC9D9840A3B202D67B3488D" xlink:to="loc_us-gaap_IncomeTaxesPaid_A827EB04E9FE7B78E36A202D67B39BA3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9505E0696F2476CDE6F2202D67B3D8A5" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A77673F530E8719901E3F81CE8441BE5" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9505E0696F2476CDE6F2202D67B3D8A5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_B47AC36E4955ABCA68AE202D67B3F7B6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9505E0696F2476CDE6F2202D67B3D8A5" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_B47AC36E4955ABCA68AE202D67B3F7B6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_CE7F42DD8021CAB54068202D67B3744D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9505E0696F2476CDE6F2202D67B3D8A5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_CE7F42DD8021CAB54068202D67B3744D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_DiscountOnProceedsFromSeniorCreditFacilitiesRecordedAsDebtIssuanceCosts" xlink:label="loc_lpla_DiscountOnProceedsFromSeniorCreditFacilitiesRecordedAsDebtIssuanceCosts_E062C556F74D7396EABE202D67B34E24" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9505E0696F2476CDE6F2202D67B3D8A5" xlink:to="loc_lpla_DiscountOnProceedsFromSeniorCreditFacilitiesRecordedAsDebtIssuanceCosts_E062C556F74D7396EABE202D67B34E24" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ConsolidatedStatementsOfFinancialCondition" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_CF83A5E24B5FEA28C1338BF907484C74" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_56F0D24075C30E0B1CCA8BF9072B3796" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_CF83A5E24B5FEA28C1338BF907484C74" xlink:to="loc_us-gaap_StatementTable_56F0D24075C30E0B1CCA8BF9072B3796" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_4869A64A9CEC408B6E5E8BF90742E4C5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_56F0D24075C30E0B1CCA8BF9072B3796" xlink:to="loc_us-gaap_StatementScenarioAxis_4869A64A9CEC408B6E5E8BF90742E4C5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_4925F1134C8AA51153448BF907429669_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_4869A64A9CEC408B6E5E8BF90742E4C5" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_4925F1134C8AA51153448BF907429669_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_4925F1134C8AA51153448BF907429669" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_4869A64A9CEC408B6E5E8BF90742E4C5" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_4925F1134C8AA51153448BF907429669" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CF83A5E24B5FEA28C1338BF907484C74" xlink:to="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_97B7D4C26F04534B855E202D5F854D8D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_97B7D4C26F04534B855E202D5F854D8D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations" xlink:label="loc_us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_49EB2545EBB8777B23B3202D5F8569A6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_49EB2545EBB8777B23B3202D5F8569A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ReceivablesAbstract" xlink:label="loc_us-gaap_ReceivablesAbstract_1870BCEC9C8F23B97969202D5F850112" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_ReceivablesAbstract_1870BCEC9C8F23B97969202D5F850112" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ReceivablesFromCustomers" xlink:label="loc_us-gaap_ReceivablesFromCustomers_6024D5033AD238AFB977202D5F851579" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivablesAbstract_1870BCEC9C8F23B97969202D5F850112" xlink:to="loc_us-gaap_ReceivablesFromCustomers_6024D5033AD238AFB977202D5F851579" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations" xlink:label="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_A58F8DF395AD6832DF44202D5F857173" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivablesAbstract_1870BCEC9C8F23B97969202D5F850112" xlink:to="loc_us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations_A58F8DF395AD6832DF44202D5F857173" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_734552F182C48F891FFF202D5F859C43" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivablesAbstract_1870BCEC9C8F23B97969202D5F850112" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_734552F182C48F891FFF202D5F859C43" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SecuritiesOwnedAbstract" xlink:label="loc_lpla_SecuritiesOwnedAbstract_42C526DEBCC2AF34C7C3202D5F85CA67" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_lpla_SecuritiesOwnedAbstract_42C526DEBCC2AF34C7C3202D5F85CA67" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TradingSecurities" xlink:label="loc_us-gaap_TradingSecurities_9D4242FEF6353FCB6808BF86683EB401" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SecuritiesOwnedAbstract_42C526DEBCC2AF34C7C3202D5F85CA67" xlink:to="loc_us-gaap_TradingSecurities_9D4242FEF6353FCB6808BF86683EB401" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_DBC3CAC1E786B2C92804202D5F851995" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SecuritiesOwnedAbstract_42C526DEBCC2AF34C7C3202D5F85CA67" xlink:to="loc_us-gaap_HeldToMaturitySecurities_DBC3CAC1E786B2C92804202D5F851995" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecuritiesBorrowed" xlink:label="loc_us-gaap_SecuritiesBorrowed_FC4DF63C08CA6C1EC4D7202D5F851991" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_SecuritiesBorrowed_FC4DF63C08CA6C1EC4D7202D5F851991" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxReceivable" xlink:label="loc_us-gaap_IncomeTaxReceivable_FC2A8BD0D4E3467598E98BF908FBE036" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_IncomeTaxReceivable_FC2A8BD0D4E3467598E98BF908FBE036" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_5E76750C6B1DB67CAF1E202D5F858DF6" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_5E76750C6B1DB67CAF1E202D5F858DF6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_81B91CD32A241EE2EE45202D5F85E2F9" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_81B91CD32A241EE2EE45202D5F85E2F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_DE1854C8AEE2AB2B36E3202D5F85993B" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_Goodwill_DE1854C8AEE2AB2B36E3202D5F85993B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_EB0DC728960A2D6CA351202D5F85701D" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_EB0DC728960A2D6CA351202D5F85701D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_us-gaap_OtherAssets_4AAA7CE1810C67526E61202D5F85D0DC" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_OtherAssets_4AAA7CE1810C67526E61202D5F85D0DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_58DF57CA1A6FD7073F58202D5F856601" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_6230D5762CEE5BC6F64D202D5F753FE5" xlink:to="loc_us-gaap_Assets_58DF57CA1A6FD7073F58202D5F856601" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_680FACA846867075E622202D5F856595" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CF83A5E24B5FEA28C1338BF907484C74" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_680FACA846867075E622202D5F856595" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_680FACA846867075E622202D5F856595" xlink:to="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DraftsPayable" xlink:label="loc_us-gaap_DraftsPayable_97FB23836EDD83ABC84B202D5F858730" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_DraftsPayable_97FB23836EDD83ABC84B202D5F858730" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PayablesToCustomers" xlink:label="loc_us-gaap_PayablesToCustomers_8B5F5C6C5BDB003FF125202D5F85E756" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_PayablesToCustomers_8B5F5C6C5BDB003FF125202D5F85E756" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PayablesToBrokerDealersAndClearingOrganizations" xlink:label="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_A97656A9631843D69E99202D5F858481" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_PayablesToBrokerDealersAndClearingOrganizations_A97656A9631843D69E99202D5F858481" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AccruedCommissionsAndAdvisoryFeesPayable" xlink:label="loc_lpla_AccruedCommissionsAndAdvisoryFeesPayable_D59FA00544AF70D45C58202D5F854DC9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_lpla_AccruedCommissionsAndAdvisoryFeesPayable_D59FA00544AF70D45C58202D5F854DC9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_03D94367215035CAED4D202D5F856829" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_03D94367215035CAED4D202D5F856829" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TaxesPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_56E5146A4313BB8A7B208C0686096C4F" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_56E5146A4313BB8A7B208C0686096C4F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_2B8FFCCCE6E8C0D5913C202D5F85B667" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_DeferredRevenueCurrent_2B8FFCCCE6E8C0D5913C202D5F85B667" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet_AE052CE6747EE038C961AD6009A5D5D9" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet_AE052CE6747EE038C961AD6009A5D5D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_384AE5B567ACD9E363D3202D5F85668E" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_DerivativeLiabilities_384AE5B567ACD9E363D3202D5F85668E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue" xlink:label="loc_us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue_8BEE86A7DA86989C69528C0C85B66558" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue_8BEE86A7DA86989C69528C0C85B66558" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_CE2CA8CC0B295481D475202D5F85712F" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_LongTermDebt_CE2CA8CC0B295481D475202D5F85712F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_AC7BCB4FECA15EE880D68C0E309D8881" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_AC7BCB4FECA15EE880D68C0E309D8881" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_D63B1FCE759A5DB43DE8202D5F8577FE" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_0DA728417B072E0066D8202D5F851FC7" xlink:to="loc_us-gaap_Liabilities_D63B1FCE759A5DB43DE8202D5F8577FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_680FACA846867075E622202D5F856595" xlink:to="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_88C7F24A9189F403760C202D5F85F935" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:to="loc_us-gaap_CommonStockValue_88C7F24A9189F403760C202D5F85F935" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_39CE500062451AEC83BF202D5F858103" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_39CE500062451AEC83BF202D5F858103" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_5BABFAFE9F16901840EC8C0B22F3AA34" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:to="loc_us-gaap_TreasuryStockValue_5BABFAFE9F16901840EC8C0B22F3AA34" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_B6B03B23611E40749BE7202D5F85EABA" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_B6B03B23611E40749BE7202D5F85EABA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_710CA30F9754D33041C3202D5F85E3D4" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_710CA30F9754D33041C3202D5F85E3D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_57EDB194F4A984943355202D5F85B82C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_A6B89DE22AF7DB3C806F202D5F850043" xlink:to="loc_us-gaap_StockholdersEquity_57EDB194F4A984943355202D5F85B82C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_AA5B54EE2D47F425691F202D5F85FB6C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_680FACA846867075E622202D5F856595" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_AA5B54EE2D47F425691F202D5F85FB6C" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ConsolidatedStatementsOfFinancialConditionParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_4C10F0EB17A61FAB46545F4D1850675E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_130DCF0A1B2CE91ABE995F4D181471B1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4C10F0EB17A61FAB46545F4D1850675E" xlink:to="loc_us-gaap_StatementTable_130DCF0A1B2CE91ABE995F4D181471B1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_158D72A4A8DB11F5E1E45F4D181E0E15" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_130DCF0A1B2CE91ABE995F4D181471B1" xlink:to="loc_us-gaap_StatementScenarioAxis_158D72A4A8DB11F5E1E45F4D181E0E15" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8747B6D5101C0EEC289E5F4D181E55AE_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_158D72A4A8DB11F5E1E45F4D181E0E15" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8747B6D5101C0EEC289E5F4D181E55AE_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8747B6D5101C0EEC289E5F4D181E55AE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_158D72A4A8DB11F5E1E45F4D181E0E15" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8747B6D5101C0EEC289E5F4D181E55AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_2EE3ABDAC5F2441E3370C02B6E421B51" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4C10F0EB17A61FAB46545F4D1850675E" xlink:to="loc_us-gaap_AssetsAbstract_2EE3ABDAC5F2441E3370C02B6E421B51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_F6EE497D13CD010495485F4ADD863458" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2EE3ABDAC5F2441E3370C02B6E421B51" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_F6EE497D13CD010495485F4ADD863458" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent_3C51024C02705E830B115F4ADD86F17F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2EE3ABDAC5F2441E3370C02B6E421B51" xlink:to="loc_us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent_3C51024C02705E830B115F4ADD86F17F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0C58630D55B0FCFF4B925F4ADD8680E1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2EE3ABDAC5F2441E3370C02B6E421B51" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0C58630D55B0FCFF4B925F4ADD8680E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedAmortizationDeferredFinanceCosts" xlink:label="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_D96FB776555739290BD85F4ADD86E6BC" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2EE3ABDAC5F2441E3370C02B6E421B51" xlink:to="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_D96FB776555739290BD85F4ADD86E6BC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_FDC2439AE05C7CB8E5545F4ADD86CDA0" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2EE3ABDAC5F2441E3370C02B6E421B51" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_FDC2439AE05C7CB8E5545F4ADD86CDA0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3428FBBACC59B17F24035F4ADD86A817" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4C10F0EB17A61FAB46545F4D1850675E" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3428FBBACC59B17F24035F4ADD86A817" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_100E88C844D3DCEA98875F4ADD86E1AF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3428FBBACC59B17F24035F4ADD86A817" xlink:to="loc_us-gaap_StockholdersEquityAbstract_100E88C844D3DCEA98875F4ADD86E1AF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_E4994D95792B82ADDF8C5F4ADD86369E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_100E88C844D3DCEA98875F4ADD86E1AF" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_E4994D95792B82ADDF8C5F4ADD86369E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_27152E1B12689E529E665F4ADD86A43A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_100E88C844D3DCEA98875F4ADD86E1AF" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_27152E1B12689E529E665F4ADD86A43A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_D948E1EB6BA090EDB3F55F4ADD865873" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_100E88C844D3DCEA98875F4ADD86E1AF" xlink:to="loc_us-gaap_CommonStockSharesIssued_D948E1EB6BA090EDB3F55F4ADD865873" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_5580925AED33625C5C945F4ADD86F96D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_100E88C844D3DCEA98875F4ADD86E1AF" xlink:to="loc_us-gaap_TreasuryStockShares_5580925AED33625C5C945F4ADD86F96D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_59B0C6D68CC75C6D91B21050D9CD37AD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:to="loc_us-gaap_StatementTable_59B0C6D68CC75C6D91B21050D9CD37AD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_CCCF835BEB2205DB8E441050D9CD4370" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_59B0C6D68CC75C6D91B21050D9CD37AD" xlink:to="loc_us-gaap_StatementScenarioAxis_CCCF835BEB2205DB8E441050D9CD4370" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_216EF000D297F84C6C5F1050D9CDD2CA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_CCCF835BEB2205DB8E441050D9CD4370" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_216EF000D297F84C6C5F1050D9CDD2CA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_216EF000D297F84C6C5F1050D9CDD2CA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_CCCF835BEB2205DB8E441050D9CD4370" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_216EF000D297F84C6C5F1050D9CDD2CA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:to="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BrokerageCommissionsRevenue" xlink:label="loc_us-gaap_BrokerageCommissionsRevenue_872AB4F60E4B806D5E241091EE9C864A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:to="loc_us-gaap_BrokerageCommissionsRevenue_872AB4F60E4B806D5E241091EE9C864A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InvestmentAdvisoryFees" xlink:label="loc_us-gaap_InvestmentAdvisoryFees_1255BAEED973F3041BEC109464CEAF09" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:to="loc_us-gaap_InvestmentAdvisoryFees_1255BAEED973F3041BEC109464CEAF09" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AssetBasedFees" xlink:label="loc_lpla_AssetBasedFees_37664AC097F2B23E0D351095CB15DD8D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:to="loc_lpla_AssetBasedFees_37664AC097F2B23E0D351095CB15DD8D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TransactionAndOtherFees" xlink:label="loc_lpla_TransactionAndOtherFees_791666811DE10BF1713910D5FB122AFF" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:to="loc_lpla_TransactionAndOtherFees_791666811DE10BF1713910D5FB122AFF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_CF9F2351304F3DC8313510D656FE5486" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_CF9F2351304F3DC8313510D656FE5486" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherIncome" xlink:label="loc_us-gaap_OtherIncome_5570C7FB94611CF54E7910D6FB9B456C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:to="loc_us-gaap_OtherIncome_5570C7FB94611CF54E7910D6FB9B456C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_EC36D89ACDA924926E8010D74083F396" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8720DA6235F8A8901DE2108FB2A6B8B0" xlink:to="loc_us-gaap_Revenues_EC36D89ACDA924926E8010D74083F396" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:to="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CommissionsAndAdvisoryFees" xlink:label="loc_lpla_CommissionsAndAdvisoryFees_10D0D13A5E4484093DE110D8D1B3BAA3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_lpla_CommissionsAndAdvisoryFees_10D0D13A5E4484093DE110D8D1B3BAA3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_3DB743347C69F8FF65B210EE40FAB386" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_LaborAndRelatedExpense_3DB743347C69F8FF65B210EE40FAB386" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_PromotionalExpenses" xlink:label="loc_lpla_PromotionalExpenses_ECA34F23BF701510F94410EFB03BCD50" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_lpla_PromotionalExpenses_ECA34F23BF701510F94410EFB03BCD50" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_B55334C7D3C1CA843BCC10EEBE1A6B3A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_DepreciationAndAmortization_B55334C7D3C1CA843BCC10EEBE1A6B3A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OccupancyNet" xlink:label="loc_us-gaap_OccupancyNet_B456C14E6267ADC707DB10EFFCE4FEB2" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_OccupancyNet_B456C14E6267ADC707DB10EFFCE4FEB2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProfessionalFees" xlink:label="loc_us-gaap_ProfessionalFees_F6003A97EFA23720652F10F07456089E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_ProfessionalFees_F6003A97EFA23720652F10F07456089E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FloorBrokerageExchangeAndClearanceFees" xlink:label="loc_us-gaap_FloorBrokerageExchangeAndClearanceFees_F40D38408FD8C6AB1B7510F11D975AFE" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_FloorBrokerageExchangeAndClearanceFees_F40D38408FD8C6AB1B7510F11D975AFE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CommunicationsAndInformationTechnology" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_E7E03431E02B01A5A9E410F1F039900E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_E7E03431E02B01A5A9E410F1F039900E" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RegulatoryFeesAndExpenses" xlink:label="loc_lpla_RegulatoryFeesAndExpenses_28C7667876FD31400B1F10F22C29F82E" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_lpla_RegulatoryFeesAndExpenses_28C7667876FD31400B1F10F22C29F82E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_920D099E3047B841E2CD10F2E94F35D7" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_RestructuringCharges_920D099E3047B841E2CD10F2E94F35D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherExpenses" xlink:label="loc_us-gaap_OtherExpenses_67BCAF6993682C1D7E0A10F755948390" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_OtherExpenses_67BCAF6993682C1D7E0A10F755948390" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_B8E0F4657BA2A89A102E10F8FB80CAA8" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_OperatingExpenses_B8E0F4657BA2A89A102E10F8FB80CAA8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestExpenseSubordinatedNotesAndDebentures" xlink:label="loc_us-gaap_InterestExpenseSubordinatedNotesAndDebentures_F8E2ED82BD304EAE3592110AB29A52BE" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_InterestExpenseSubordinatedNotesAndDebentures_F8E2ED82BD304EAE3592110AB29A52BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_96074410C3488CD8473A10FC590893BB" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_96074410C3488CD8473A10FC590893BB" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_Expenses" xlink:label="loc_lpla_Expenses_66D6267A0AE1400DC43B10FD27E624E5" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_B5B88B51678796735DEF10D868E7FE6E" xlink:to="loc_lpla_Expenses_66D6267A0AE1400DC43B10FD27E624E5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6403B55897C7A3467151110089D7B7F2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6403B55897C7A3467151110089D7B7F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_FE84DD75723BF9A23740110150DC2AA6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_FE84DD75723BF9A23740110150DC2AA6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_D9107489CBD2AECEAE011101EF4FE186" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:to="loc_us-gaap_NetIncomeLoss_D9107489CBD2AECEAE011101EF4FE186" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_8CF0EFFB89AF0CA2E52A11035F16592F" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_A146BCA5DBEB4207C60F1050D9CD0A22" xlink:to="loc_us-gaap_EarningsPerShareAbstract_8CF0EFFB89AF0CA2E52A11035F16592F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_AF4D622A5FEF45EA91EC1103A659002A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_8CF0EFFB89AF0CA2E52A11035F16592F" xlink:to="loc_us-gaap_EarningsPerShareBasic_AF4D622A5FEF45EA91EC1103A659002A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_45858DBC8991548EE3771104055810A8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_8CF0EFFB89AF0CA2E52A11035F16592F" xlink:to="loc_us-gaap_EarningsPerShareDiluted_45858DBC8991548EE3771104055810A8" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_4DB20AA78A1F1892778C202D61692147" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StatementTable_4DB20AA78A1F1892778C202D61692147" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_DC3DA0AC9CFCD631CF10202D6169DD52" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4DB20AA78A1F1892778C202D61692147" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_DC3DA0AC9CFCD631CF10202D6169DD52" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_DC3DA0AC9CFCD631CF10202D6169DD52" xlink:to="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_DC3DA0AC9CFCD631CF10202D6169DD52" xlink:to="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_2DD2E95CAA01BB207377202D61697F4B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:to="loc_us-gaap_CommonStockMember_2DD2E95CAA01BB207377202D61697F4B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_EF09D9EC205958352A5B202D61691999" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_EF09D9EC205958352A5B202D61691999" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_StockholderLoansMember" xlink:label="loc_lpla_StockholderLoansMember_063871B3FDA635BD37FA202D6169FA2C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:to="loc_lpla_StockholderLoansMember_063871B3FDA635BD37FA202D6169FA2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_C251BD05C9D3B8A93FB1202D6169DCAD" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_C251BD05C9D3B8A93FB1202D6169DCAD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_D48AF2D9FA239A1FC9728C9A5244B222" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:to="loc_us-gaap_TreasuryStockMember_D48AF2D9FA239A1FC9728C9A5244B222" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_A5C7652B6D7AD1D09332202D61690CEB" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6C1657F34680D8D1F715202D61699129" xlink:to="loc_us-gaap_RetainedEarningsMember_A5C7652B6D7AD1D09332202D61690CEB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_E06957C401F067BAA0E5202D6169C1ED" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockholdersEquity_E06957C401F067BAA0E5202D6169C1ED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaap_SharesIssued_58FB367C8F1B72D24A94202D616947F4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_SharesIssued_58FB367C8F1B72D24A94202D616947F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_05CE993E7149788AA25B202D616906AC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_05CE993E7149788AA25B202D616906AC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_AF2A81750F4672ECD0C8202D61697CB3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_05CE993E7149788AA25B202D616906AC" xlink:to="loc_us-gaap_NetIncomeLoss_AF2A81750F4672ECD0C8202D61697CB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease_00B035DE5D7EF4805913202D6169E641" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_05CE993E7149788AA25B202D616906AC" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease_00B035DE5D7EF4805913202D6169E641" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_0CED264651BF82FB79FA202D6169129C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_05CE993E7149788AA25B202D616906AC" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_0CED264651BF82FB79FA202D6169129C" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_StockholdersLoans" xlink:label="loc_lpla_StockholdersLoans_2B185F8CCAADD5F001AA202D6169D3B9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_lpla_StockholdersLoans_2B185F8CCAADD5F001AA202D6169D3B9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_1EE44BA0846808E158088CC2E7EEDF42" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_1EE44BA0846808E158088CC2E7EEDF42" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_16AE90FFD726E75F1C8C8C9A51C6DB9E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_16AE90FFD726E75F1C8C8C9A51C6DB9E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_C44B52218BA4EE5CB045202D6169BC2A" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_C44B52218BA4EE5CB045202D6169BC2A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_A973635ACFA6C4BC1028202D61690904" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_A973635ACFA6C4BC1028202D61690904" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_58FE25B5BAAD633DDE58202D61691422" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_58FE25B5BAAD633DDE58202D61691422" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_StockIssuedDuringPeriodValueRestrictedStockAwardReleased" xlink:label="loc_lpla_StockIssuedDuringPeriodValueRestrictedStockAwardReleased_2D644AFE659A2104F1A38CBDD2924559" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_lpla_StockIssuedDuringPeriodValueRestrictedStockAwardReleased_2D644AFE659A2104F1A38CBDD2924559" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet" xlink:label="loc_us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet_CD173A77B6AF6026847B202D6169A995" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet_CD173A77B6AF6026847B202D6169A995" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6853FC1AB85A7F659EB6202D616930D6" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6853FC1AB85A7F659EB6202D616930D6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_A1593EC5F24EF9C2C4F2202D61694F33" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_A1593EC5F24EF9C2C4F2202D61694F33" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_70839A4D6F3A309A63CE202D61697866" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_70839A4D6F3A309A63CE202D61697866" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_BF34235E94893240B40E202D6169EBDA" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_BF34235E94893240B40E202D6169EBDA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_C688F9E22BC563A96891202D6169D846" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C327BFEC9B450EC35E57202D61692385" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_C688F9E22BC563A96891202D6169D846" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_769C9848135AD5B2DBAC5F6C09B09246" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_FBF99FFF815C136210405F6C09B0441B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_769C9848135AD5B2DBAC5F6C09B09246" xlink:to="loc_us-gaap_StatementTable_FBF99FFF815C136210405F6C09B0441B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_A37C9F774DE3FC7FA69B5F6C09B0467B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_FBF99FFF815C136210405F6C09B0441B" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_A37C9F774DE3FC7FA69B5F6C09B0467B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_2942EEB1646CE9936F205F6C09B03A1B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_A37C9F774DE3FC7FA69B5F6C09B0467B" xlink:to="loc_us-gaap_EquityComponentDomain_2942EEB1646CE9936F205F6C09B03A1B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_2942EEB1646CE9936F205F6C09B03A1B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_A37C9F774DE3FC7FA69B5F6C09B0467B" xlink:to="loc_us-gaap_EquityComponentDomain_2942EEB1646CE9936F205F6C09B03A1B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8A748407A15547928A725F6C09B0DB69" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2942EEB1646CE9936F205F6C09B03A1B" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8A748407A15547928A725F6C09B0DB69" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease_1F290F5EF9775D413AD75F6C09B0CAFB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_769C9848135AD5B2DBAC5F6C09B09246" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease_1F290F5EF9775D413AD75F6C09B0CAFB" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/DocumentAndEntityInformation" xlink:type="extended">
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityInformationLineItems" xlink:label="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntitiesTable" xlink:label="loc_dei_EntitiesTable_CE3B5C98B24EE4DFE0925F35B9A47359" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntitiesTable_CE3B5C98B24EE4DFE0925F35B9A47359" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_567A85E1DD58E56441F35F35B9A47CC0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_CE3B5C98B24EE4DFE0925F35B9A47359" xlink:to="loc_dei_LegalEntityAxis_567A85E1DD58E56441F35F35B9A47CC0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_05B755EC3E64EA15A2045F35B9A4002A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_567A85E1DD58E56441F35F35B9A47CC0" xlink:to="loc_dei_EntityDomain_05B755EC3E64EA15A2045F35B9A4002A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_05B755EC3E64EA15A2045F35B9A4002A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_567A85E1DD58E56441F35F35B9A47CC0" xlink:to="loc_dei_EntityDomain_05B755EC3E64EA15A2045F35B9A4002A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_161E88BE6743ED97B19F5F30372C7453" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityRegistrantName_161E88BE6743ED97B19F5F30372C7453" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_299BBD7139FA491D55D75F30372CAE7A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityCentralIndexKey_299BBD7139FA491D55D75F30372CAE7A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_D36E8F6599AD5E2304F65F30372CA0FD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_DocumentType_D36E8F6599AD5E2304F65F30372CA0FD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_5EE056C2C092DD40F4745F30372C037E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_DocumentPeriodEndDate_5EE056C2C092DD40F4745F30372C037E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_9E28E0AEE7C825648BC85F30372CCF25" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_AmendmentFlag_9E28E0AEE7C825648BC85F30372CCF25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_C2C0E9421436A0210AA45F30372C1D55" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_DocumentFiscalPeriodFocus_C2C0E9421436A0210AA45F30372C1D55" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_C2512525C8C560E1D15F5F30372C8AD6" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_DocumentFiscalYearFocus_C2512525C8C560E1D15F5F30372C8AD6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_4F9BD3BCB4C738EFC7135F30372C86E9" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_CurrentFiscalYearEndDate_4F9BD3BCB4C738EFC7135F30372C86E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_B1F82AFE3145DF51B6E35F820D49EFC7" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_B1F82AFE3145DF51B6E35F820D49EFC7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_6A76411F77EAEF8588E45F80B74A6DF8" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityCurrentReportingStatus_6A76411F77EAEF8588E45F80B74A6DF8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_CA29601CC1D2EB29840E5F80059F3D9D" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityVoluntaryFilers_CA29601CC1D2EB29840E5F80059F3D9D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_0ABED0FCA8D9864D4E8E5F30372C0B0B" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityFilerCategory_0ABED0FCA8D9864D4E8E5F30372C0B0B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_B297AE3E7A8BEBB49778C02233D51218" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_B297AE3E7A8BEBB49778C02233D51218" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_769F6B7DA7F3828E55EF2064F3DA81C9" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9F3EA3B159F999210D115F35BA44067A" xlink:to="loc_dei_EntityPublicFloat_769F6B7DA7F3828E55EF2064F3DA81C9" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/EarningsPerShareDetailsTextuals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D913587ED14F944F3118A79BA8BF32ED" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_3F3F26928139B3CA865DA79B0815B759" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D913587ED14F944F3118A79BA8BF32ED" xlink:to="loc_us-gaap_StatementTable_3F3F26928139B3CA865DA79B0815B759" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ShareRepurchaseProgramByAuthorizationDateAxis" xlink:label="loc_lpla_ShareRepurchaseProgramByAuthorizationDateAxis_1AF5DAD48767D54D2946A794ED723208" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3F3F26928139B3CA865DA79B0815B759" xlink:to="loc_lpla_ShareRepurchaseProgramByAuthorizationDateAxis_1AF5DAD48767D54D2946A794ED723208" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ShareRepurchaseProgramAuthorizationDateDomain" xlink:label="loc_lpla_ShareRepurchaseProgramAuthorizationDateDomain_C8A5B1C657E0CCBF1518A79674E7A479_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_ShareRepurchaseProgramByAuthorizationDateAxis_1AF5DAD48767D54D2946A794ED723208" xlink:to="loc_lpla_ShareRepurchaseProgramAuthorizationDateDomain_C8A5B1C657E0CCBF1518A79674E7A479_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ShareRepurchaseProgramAuthorizationDateDomain" xlink:label="loc_lpla_ShareRepurchaseProgramAuthorizationDateDomain_C8A5B1C657E0CCBF1518A79674E7A479" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_ShareRepurchaseProgramByAuthorizationDateAxis_1AF5DAD48767D54D2946A794ED723208" xlink:to="loc_lpla_ShareRepurchaseProgramAuthorizationDateDomain_C8A5B1C657E0CCBF1518A79674E7A479" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_May2011Member" xlink:label="loc_lpla_May2011Member_0A8579ACDC80102C4F1BA7972415854D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ShareRepurchaseProgramAuthorizationDateDomain_C8A5B1C657E0CCBF1518A79674E7A479" xlink:to="loc_lpla_May2011Member_0A8579ACDC80102C4F1BA7972415854D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_August2011Member" xlink:label="loc_lpla_August2011Member_DB6C310230FDFA6BA9B5A798435BC6E1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ShareRepurchaseProgramAuthorizationDateDomain_C8A5B1C657E0CCBF1518A79674E7A479" xlink:to="loc_lpla_August2011Member_DB6C310230FDFA6BA9B5A798435BC6E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_ABBC78641236512FED3E202DA8469376" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D913587ED14F944F3118A79BA8BF32ED" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_ABBC78641236512FED3E202DA8469376" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_51B251CA5A30047DA9CAA79979496FB3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D913587ED14F944F3118A79BA8BF32ED" xlink:to="loc_us-gaap_EquityAbstract_51B251CA5A30047DA9CAA79979496FB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount_77AE52B33D335BE77378A776B38A4D23" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_51B251CA5A30047DA9CAA79979496FB3" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount_77AE52B33D335BE77378A776B38A4D23" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_7DE92A2E2538AACC8677A7899E5F30C0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_51B251CA5A30047DA9CAA79979496FB3" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_7DE92A2E2538AACC8677A7899E5F30C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_247D29263EA8AC7B9487A78AF703D56A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_51B251CA5A30047DA9CAA79979496FB3" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_247D29263EA8AC7B9487A78AF703D56A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_D0B42D4620190820A378A78BF1AF2E11" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_51B251CA5A30047DA9CAA79979496FB3" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_D0B42D4620190820A378A78BF1AF2E11" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/FairValueMeasurementsChangesInLevel3RecurringFairValueMeasurementsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_8187EB4058C58C6785DA83A100FB1430" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A91EF04552EB3A065C9683A100FAA209" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_8187EB4058C58C6785DA83A100FB1430" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A91EF04552EB3A065C9683A100FAA209" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_10CF4D7A0E52D51CB62F83A103CE2396" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A91EF04552EB3A065C9683A100FAA209" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_10CF4D7A0E52D51CB62F83A103CE2396" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_37FDDB2A0D541C96C94D83A105013432_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_10CF4D7A0E52D51CB62F83A103CE2396" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_37FDDB2A0D541C96C94D83A105013432_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_37FDDB2A0D541C96C94D83A105013432" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_10CF4D7A0E52D51CB62F83A103CE2396" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_37FDDB2A0D541C96C94D83A105013432" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_08F257C053EADA7A988A83A10400ACF3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_37FDDB2A0D541C96C94D83A105013432" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_08F257C053EADA7A988A83A10400ACF3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_FA4F42C089FDC48155C083A103B5631E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A91EF04552EB3A065C9683A100FAA209" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_FA4F42C089FDC48155C083A103B5631E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_691241F7A1CE5C7FA86183A104E1DC35_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_FA4F42C089FDC48155C083A103B5631E" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_691241F7A1CE5C7FA86183A104E1DC35_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_691241F7A1CE5C7FA86183A104E1DC35" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_FA4F42C089FDC48155C083A103B5631E" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_691241F7A1CE5C7FA86183A104E1DC35" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_F6A7BD47D9114956B82B83A103E92B09" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_691241F7A1CE5C7FA86183A104E1DC35" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_F6A7BD47D9114956B82B83A103E92B09" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_96BA22A1BB2E2079AB8D83A40645FD44" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_8187EB4058C58C6785DA83A100FB1430" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_96BA22A1BB2E2079AB8D83A40645FD44" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01D3D4CBAB4B8AB0AF00841986418F4B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_96BA22A1BB2E2079AB8D83A40645FD44" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_01D3D4CBAB4B8AB0AF00841986418F4B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_FCC0FB6AEBA3253F0AFC83A102B02E8F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_96BA22A1BB2E2079AB8D83A40645FD44" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_FCC0FB6AEBA3253F0AFC83A102B02E8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_4C135A8C1D2746EEE3F783A103845694" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_96BA22A1BB2E2079AB8D83A40645FD44" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_4C135A8C1D2746EEE3F783A103845694" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_C257B94A2224C009B29683A103A0D9B7" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_96BA22A1BB2E2079AB8D83A40645FD44" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_C257B94A2224C009B29683A103A0D9B7" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/FairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_96893449CAA442335308B0B1A33DE732" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_96893449CAA442335308B0B1A33DE732" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_1A30FA766D6345CAC6F6B0B1A34A3487_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_96893449CAA442335308B0B1A33DE732" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_1A30FA766D6345CAC6F6B0B1A34A3487_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_1A30FA766D6345CAC6F6B0B1A34A3487" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_96893449CAA442335308B0B1A33DE732" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_1A30FA766D6345CAC6F6B0B1A34A3487" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ImpairmentInValueOfAssetMember" xlink:label="loc_us-gaap_ImpairmentInValueOfAssetMember_21F050F97DDB16CBB0EFB0B1A472C048" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_1A30FA766D6345CAC6F6B0B1A34A3487" xlink:to="loc_us-gaap_ImpairmentInValueOfAssetMember_21F050F97DDB16CBB0EFB0B1A472C048" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_EF46FBD675A3130EF0C7842001E7DA5F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_EF46FBD675A3130EF0C7842001E7DA5F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_24CFC947008D9CEBE986842001E8FAFF_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_EF46FBD675A3130EF0C7842001E7DA5F" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_24CFC947008D9CEBE986842001E8FAFF_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_24CFC947008D9CEBE986842001E8FAFF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_EF46FBD675A3130EF0C7842001E7DA5F" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_24CFC947008D9CEBE986842001E8FAFF" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IntangibleAssetsMember" xlink:label="loc_lpla_IntangibleAssetsMember_32DB2494FF6E51E381C7842003C8C92D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_24CFC947008D9CEBE986842001E8FAFF" xlink:to="loc_lpla_IntangibleAssetsMember_32DB2494FF6E51E381C7842003C8C92D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_FixedAssetsMember" xlink:label="loc_lpla_FixedAssetsMember_184A1805196358BB36C8842007167F80" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_24CFC947008D9CEBE986842001E8FAFF" xlink:to="loc_lpla_FixedAssetsMember_184A1805196358BB36C8842007167F80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis_A19DD39EF8D541EB1C1183E6D0F9EDB9" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:to="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis_A19DD39EF8D541EB1C1183E6D0F9EDB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain" xlink:label="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis_A19DD39EF8D541EB1C1183E6D0F9EDB9" xlink:to="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain" xlink:label="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsMajorTypesOfTradingSecuritiesAndAssetsAxis_A19DD39EF8D541EB1C1183E6D0F9EDB9" xlink:to="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_6C384399C04967991F8D83E7EF96F85C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:to="loc_us-gaap_MoneyMarketFundsMember_6C384399C04967991F8D83E7EF96F85C" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_MutualFundsMember" xlink:label="loc_lpla_MutualFundsMember_8E3DB2CD01EC5105BC0A83E7F10C3DDF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:to="loc_lpla_MutualFundsMember_8E3DB2CD01EC5105BC0A83E7F10C3DDF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_F829B82300AFB7DECBF283E7F1FA858B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:to="loc_us-gaap_EquitySecuritiesMember_F829B82300AFB7DECBF283E7F1FA858B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_7B7C42FB9FC125BDD63C83EA9370D00A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:to="loc_us-gaap_DebtSecuritiesMember_7B7C42FB9FC125BDD63C83EA9370D00A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CertificatesOfDepositMember" xlink:label="loc_us-gaap_CertificatesOfDepositMember_AADCA06E572A1B52698983EA963EEBBF" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:to="loc_us-gaap_CertificatesOfDepositMember_AADCA06E572A1B52698983EA963EEBBF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_5EE6F0A9D6B53901459683EBF9565615" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfTradingSecuritiesAndAssetsDomain_C1CD4BBE7D5D1BBC934983E77FEFA2B7" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_5EE6F0A9D6B53901459683EBF9565615" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis" xlink:label="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis_6BEA6801C9762F3D4A7383ABA900966A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:to="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis_6BEA6801C9762F3D4A7383ABA900966A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain" xlink:label="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis_6BEA6801C9762F3D4A7383ABA900966A" xlink:to="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain" xlink:label="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedAtFairValueAxis_6BEA6801C9762F3D4A7383ABA900966A" xlink:to="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CertificatesOfDepositMember" xlink:label="loc_us-gaap_CertificatesOfDepositMember_689998C39D1EEC66DAFEA6DB0AB8A502" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB" xlink:to="loc_us-gaap_CertificatesOfDepositMember_689998C39D1EEC66DAFEA6DB0AB8A502" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_MutualFundsMember" xlink:label="loc_lpla_MutualFundsMember_42FBE793CA6D8D6471DC83ABACA5927E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB" xlink:to="loc_lpla_MutualFundsMember_42FBE793CA6D8D6471DC83ABACA5927E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_416DDD6209DB2372F6D283ABACE273EE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB" xlink:to="loc_us-gaap_EquitySecuritiesMember_416DDD6209DB2372F6D283ABACE273EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_A093F0B6B4B606315FA783ABAD374A44" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB" xlink:to="loc_us-gaap_DebtSecuritiesMember_A093F0B6B4B606315FA783ABAD374A44" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecuritiesSoldNotYetPurchasedMember" xlink:label="loc_us-gaap_SecuritiesSoldNotYetPurchasedMember_B1C3D186CA2891F1502283ABAD545662" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityNameDomain_23C57FE9A12B53CAE96B83ABA900D5CB" xlink:to="loc_us-gaap_SecuritiesSoldNotYetPurchasedMember_B1C3D186CA2891F1502283ABAD545662" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis_1D10CB86DDEE55C5741983ABA8A6A53E" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis_1D10CB86DDEE55C5741983ABA8A6A53E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis_1D10CB86DDEE55C5741983ABA8A6A53E" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis_1D10CB86DDEE55C5741983ABA8A6A53E" xlink:to="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_7615703CEFDF1EC102F083ABA954C6E0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:to="loc_us-gaap_MoneyMarketFundsMember_7615703CEFDF1EC102F083ABA954C6E0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_MutualFundsMember" xlink:label="loc_lpla_MutualFundsMember_6D84B95A28D040C46FA583ABA9CC71A9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:to="loc_lpla_MutualFundsMember_6D84B95A28D040C46FA583ABA9CC71A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_87E34D2E37FDA35265BD83ABA9FE1175" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:to="loc_us-gaap_EquitySecuritiesMember_87E34D2E37FDA35265BD83ABA9FE1175" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="loc_us-gaap_DebtSecuritiesMember_5A5216859C5E64763A6683ABAA3081A6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:to="loc_us-gaap_DebtSecuritiesMember_5A5216859C5E64763A6683ABAA3081A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_28F13336DBE599B12FA083ABAA65458C" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_28F13336DBE599B12FA083ABAA65458C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CertificatesOfDepositMember" xlink:label="loc_us-gaap_CertificatesOfDepositMember_E63290C0E47BF27D5B9D83ABAC00005C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_056E5CA0EB45A923157883ABA8A633F0" xlink:to="loc_us-gaap_CertificatesOfDepositMember_E63290C0E47BF27D5B9D83ABAC00005C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8FA285BA5948F4E22AC283ABA521C8C9" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8FA285BA5948F4E22AC283ABA521C8C9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_011B27121A859BFD92D483ABA5215BEF_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8FA285BA5948F4E22AC283ABA521C8C9" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_011B27121A859BFD92D483ABA5215BEF_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_011B27121A859BFD92D483ABA5215BEF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8FA285BA5948F4E22AC283ABA521C8C9" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_011B27121A859BFD92D483ABA5215BEF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_2B0EC1163191D69EEB10842004A3B5AB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_011B27121A859BFD92D483ABA5215BEF" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_2B0EC1163191D69EEB10842004A3B5AB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_77F4A681EAAF35524F4383ABAD15D3F2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_011B27121A859BFD92D483ABA5215BEF" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_77F4A681EAAF35524F4383ABAD15D3F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_DA587B90967FE799563583ABA52106D3" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C70EFB017EB76C9376E583ABA521F91F" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_DA587B90967FE799563583ABA52106D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_DA587B90967FE799563583ABA52106D3" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_DA587B90967FE799563583ABA52106D3" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_BA0400503231C501855083ABAC6C2027" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_BA0400503231C501855083ABAC6C2027" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_3DE2377772694E37088C83ABAD921481" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_3DE2377772694E37088C83ABAD921481" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_2D04B100EDD57B5F224583ABA98C30F0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_2D04B100EDD57B5F224583ABA98C30F0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_B6E92EC0767A7CDAADAD83ABAD73190D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D6D049D2C31DFCEE00A283ABA5215475" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_B6E92EC0767A7CDAADAD83ABAD73190D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringReserveSettledWithoutCash" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash_28EDB535F1304081A5BDB0B5BFDF98DB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_RestructuringReserveSettledWithoutCash_28EDB535F1304081A5BDB0B5BFDF98DB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_A5D3956D333A932530A983ABA562A5EB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_A5D3956D333A932530A983ABA562A5EB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TradingSecuritiesFairValueDisclosure" xlink:label="loc_us-gaap_TradingSecuritiesFairValueDisclosure_EE36D2B42ACFFB69FEEE83E4B35A3D60" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_TradingSecuritiesFairValueDisclosure_EE36D2B42ACFFB69FEEE83E4B35A3D60" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherAssetsFairValueDisclosure" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_AF9BF234B137B8F5E33983ABA5E32405" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_AF9BF234B137B8F5E33983ABA5E32405" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AssetsFairValueDisclosureRecurring" xlink:label="loc_us-gaap_AssetsFairValueDisclosureRecurring_1E02F22DC18F811AB78683ABA80AF22A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_AssetsFairValueDisclosureRecurring_1E02F22DC18F811AB78683ABA80AF22A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecuritiesSoldNotYetPurchasedFairValueDisclosure" xlink:label="loc_us-gaap_SecuritiesSoldNotYetPurchasedFairValueDisclosure_325701717241516956E683ABA8321CFD" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_SecuritiesSoldNotYetPurchasedFairValueDisclosure_325701717241516956E683ABA8321CFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestRateDerivativeLiabilitiesAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_8C1D5A83A7828E31B23D83ABA85BF5E4" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_InterestRateDerivativeLiabilitiesAtFairValue_8C1D5A83A7828E31B23D83ABA85BF5E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure_BE9927777C10FA7EEAA083EE88D33D8F" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure_BE9927777C10FA7EEAA083EE88D33D8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_4259416B2D2C597EC7D083ABA881EFC7" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_4259416B2D2C597EC7D083ABA881EFC7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AssetImpairmentChargesAbstract" xlink:label="loc_us-gaap_AssetImpairmentChargesAbstract_F2862B4569C2A4ECC4908420DB1BA262" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_E33778CFC04710FB223A83ABA52168A6" xlink:to="loc_us-gaap_AssetImpairmentChargesAbstract_F2862B4569C2A4ECC4908420DB1BA262" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_2DBB471CA20630EA2412842000A1ED00" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetImpairmentChargesAbstract_F2862B4569C2A4ECC4908420DB1BA262" xlink:to="loc_us-gaap_AssetImpairmentCharges_2DBB471CA20630EA2412842000A1ED00" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/GoodwillAndIntangibleAssetsDetails" xlink:type="extended">
    <loc xlink:href="lpla-20111231.xsd#lpla_IntangibleAssetsLineItems" xlink:label="loc_lpla_IntangibleAssetsLineItems_FE44F8003C57CA98247884F7D1CEA6DF" xlink:type="locator" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfIntangibleAssetsByMajorClassTable" xlink:label="loc_lpla_ScheduleOfIntangibleAssetsByMajorClassTable_CB82F2291E638CD0583784F67F971159" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lpla_IntangibleAssetsLineItems_FE44F8003C57CA98247884F7D1CEA6DF" xlink:to="loc_lpla_ScheduleOfIntangibleAssetsByMajorClassTable_CB82F2291E638CD0583784F67F971159" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9054F519CFBF7AB0DA81202D8DA909C0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_ScheduleOfIntangibleAssetsByMajorClassTable_CB82F2291E638CD0583784F67F971159" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9054F519CFBF7AB0DA81202D8DA909C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D142FC0D44FA4045D29F202D8DA99372_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9054F519CFBF7AB0DA81202D8DA909C0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D142FC0D44FA4045D29F202D8DA99372_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D142FC0D44FA4045D29F202D8DA99372" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9054F519CFBF7AB0DA81202D8DA909C0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D142FC0D44FA4045D29F202D8DA99372" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AdvisorAndFinancialInstitutionRelationshipsMember" xlink:label="loc_lpla_AdvisorAndFinancialInstitutionRelationshipsMember_E89C1CC579CF1D91DD69202D8DA9AFA8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D142FC0D44FA4045D29F202D8DA99372" xlink:to="loc_lpla_AdvisorAndFinancialInstitutionRelationshipsMember_E89C1CC579CF1D91DD69202D8DA9AFA8" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ProductSponsorRelationshipsMember" xlink:label="loc_lpla_ProductSponsorRelationshipsMember_9268DEAC8ACEBE79F7E2202D8DA974D9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D142FC0D44FA4045D29F202D8DA99372" xlink:to="loc_lpla_ProductSponsorRelationshipsMember_9268DEAC8ACEBE79F7E2202D8DA974D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_8DFDDAEC0D82B6C3B2D7202D8DA9147C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_D142FC0D44FA4045D29F202D8DA99372" xlink:to="loc_us-gaap_CustomerRelationshipsMember_8DFDDAEC0D82B6C3B2D7202D8DA9147C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_1011EC672873B978CFD0202D8DA9B0A6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_ScheduleOfIntangibleAssetsByMajorClassTable_CB82F2291E638CD0583784F67F971159" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_1011EC672873B978CFD0202D8DA9B0A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E0A04C6EA237BE4623F3202D8DA981FD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_1011EC672873B978CFD0202D8DA9B0A6" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E0A04C6EA237BE4623F3202D8DA981FD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E0A04C6EA237BE4623F3202D8DA981FD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_1011EC672873B978CFD0202D8DA9B0A6" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E0A04C6EA237BE4623F3202D8DA981FD" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TrademarkAndTradeNameMember" xlink:label="loc_lpla_TrademarkAndTradeNameMember_6A2B3DFB1BFCBCD12C44202D8DA9C637" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_E0A04C6EA237BE4623F3202D8DA981FD" xlink:to="loc_lpla_TrademarkAndTradeNameMember_6A2B3DFB1BFCBCD12C44202D8DA9C637" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNetAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_E8F85B825881EB25A94C202D8DA9F506" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IntangibleAssetsLineItems_FE44F8003C57CA98247884F7D1CEA6DF" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_E8F85B825881EB25A94C202D8DA9F506" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_ED68C3B8A2A298A7D6E1202D8DA927D0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_E8F85B825881EB25A94C202D8DA9F506" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_ED68C3B8A2A298A7D6E1202D8DA927D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_698369D455A9856664F8202D8DA9930E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_E8F85B825881EB25A94C202D8DA9F506" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_698369D455A9856664F8202D8DA9930E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_96761A7D8A163AC7951D202D8DA9FB1A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_E8F85B825881EB25A94C202D8DA9F506" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_96761A7D8A163AC7951D202D8DA9FB1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsWeightedAverageUsefulLife_95F7CB67A64C41BE67DAA73A559B1F0D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNetAbstract_E8F85B825881EB25A94C202D8DA9F506" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsWeightedAverageUsefulLife_95F7CB67A64C41BE67DAA73A559B1F0D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_B92F87EF287216EBBCE6202D8DA9183E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IntangibleAssetsLineItems_FE44F8003C57CA98247884F7D1CEA6DF" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_B92F87EF287216EBBCE6202D8DA9183E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_6AF96F7EEE27C7FDAD00202D8DA96BA9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_B92F87EF287216EBBCE6202D8DA9183E" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_6AF96F7EEE27C7FDAD00202D8DA96BA9" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfIntangibleAssetAbstract" xlink:label="loc_lpla_ScheduleOfIntangibleAssetAbstract_2E940A4627BE06B558ED202D8DA9B54C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IntangibleAssetsLineItems_FE44F8003C57CA98247884F7D1CEA6DF" xlink:to="loc_lpla_ScheduleOfIntangibleAssetAbstract_2E940A4627BE06B558ED202D8DA9B54C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_2B076B9D759DC4AE35DE202D8DA9A520" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ScheduleOfIntangibleAssetAbstract_2E940A4627BE06B558ED202D8DA9B54C" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_2B076B9D759DC4AE35DE202D8DA9A520" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/GoodwillAndIntangibleAssetsGoodwillDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_CD637BC36B4E13597C84F8EAD752FCD2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_50916274B9D1BD05C8D9F8EAD7523C03" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_CD637BC36B4E13597C84F8EAD752FCD2" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_50916274B9D1BD05C8D9F8EAD7523C03" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_0365DC73B22AA5A1E94AA72718847C85" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_50916274B9D1BD05C8D9F8EAD7523C03" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_0365DC73B22AA5A1E94AA72718847C85" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DF2EFF731FD835C1D35EA72718851747_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0365DC73B22AA5A1E94AA72718847C85" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DF2EFF731FD835C1D35EA72718851747_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DF2EFF731FD835C1D35EA72718851747" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0365DC73B22AA5A1E94AA72718847C85" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DF2EFF731FD835C1D35EA72718851747" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_NationalRetirementPartnersMember" xlink:label="loc_lpla_NationalRetirementPartnersMember_97E8E7FFA5B9028E33D7A72719385D8D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DF2EFF731FD835C1D35EA72718851747" xlink:to="loc_lpla_NationalRetirementPartnersMember_97E8E7FFA5B9028E33D7A72719385D8D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ConcordCapitalPartnersMember" xlink:label="loc_lpla_ConcordCapitalPartnersMember_FA15551745FFA66419C6A7271A08CCDD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DF2EFF731FD835C1D35EA72718851747" xlink:to="loc_lpla_ConcordCapitalPartnersMember_FA15551745FFA66419C6A7271A08CCDD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_6CC649AD50BE3F040037F8EADA6055F8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_CD637BC36B4E13597C84F8EAD752FCD2" xlink:to="loc_us-gaap_Goodwill_6CC649AD50BE3F040037F8EADA6055F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_2FBA7606287C3B2E0125F8EADA50E734" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_CD637BC36B4E13597C84F8EAD752FCD2" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount_2FBA7606287C3B2E0125F8EADA50E734" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/HeldToMaturitySecuritiesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_43892D7173B027A163F7202D80C8BFB8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_3A208EF9FAA16FD233FE202D80C8719B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_43892D7173B027A163F7202D80C8BFB8" xlink:to="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_3A208EF9FAA16FD233FE202D80C8719B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainLossOnInvestmentsByCategoryAxis" xlink:label="loc_us-gaap_GainLossOnInvestmentsByCategoryAxis_5A363F6E8E2BE177713290703DDC60AB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_3A208EF9FAA16FD233FE202D80C8719B" xlink:to="loc_us-gaap_GainLossOnInvestmentsByCategoryAxis_5A363F6E8E2BE177713290703DDC60AB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain" xlink:label="loc_us-gaap_GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain_2409B29170CE51341AB6968D49599F8F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GainLossOnInvestmentsByCategoryAxis_5A363F6E8E2BE177713290703DDC60AB" xlink:to="loc_us-gaap_GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain_2409B29170CE51341AB6968D49599F8F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain" xlink:label="loc_us-gaap_GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain_2409B29170CE51341AB6968D49599F8F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GainLossOnInvestmentsByCategoryAxis_5A363F6E8E2BE177713290703DDC60AB" xlink:to="loc_us-gaap_GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain_2409B29170CE51341AB6968D49599F8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_A30511F89E5FB4FCFA0D90746585A714" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain_2409B29170CE51341AB6968D49599F8F" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_A30511F89E5FB4FCFA0D90746585A714" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtSecurityAxis" xlink:label="loc_us-gaap_DebtSecurityAxis_9019F444D3F12EB075BA202D80C8879E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_3A208EF9FAA16FD233FE202D80C8719B" xlink:to="loc_us-gaap_DebtSecurityAxis_9019F444D3F12EB075BA202D80C8879E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_A3030B7C1AF965FBBDA1202D80C82681_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtSecurityAxis_9019F444D3F12EB075BA202D80C8879E" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_A3030B7C1AF965FBBDA1202D80C82681_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_A3030B7C1AF965FBBDA1202D80C82681" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtSecurityAxis_9019F444D3F12EB075BA202D80C8879E" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_A3030B7C1AF965FBBDA1202D80C82681" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_5252BE4CE5A056E61B12202D80C8468C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_A3030B7C1AF965FBBDA1202D80C82681" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_5252BE4CE5A056E61B12202D80C8468C" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_HeldToMaturitySecuritiesAbstract" xlink:label="loc_lpla_HeldToMaturitySecuritiesAbstract_ED9BB6DF5F8E552A8B84202D80C8032A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_43892D7173B027A163F7202D80C8BFB8" xlink:to="loc_lpla_HeldToMaturitySecuritiesAbstract_ED9BB6DF5F8E552A8B84202D80C8032A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_5C63F99A4BBE679D3785202D80C8E5D2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_HeldToMaturitySecuritiesAbstract_ED9BB6DF5F8E552A8B84202D80C8032A" xlink:to="loc_us-gaap_HeldToMaturitySecurities_5C63F99A4BBE679D3785202D80C8E5D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldtomaturitySecuritiesUnrecognizedHoldingGain" xlink:label="loc_us-gaap_HeldtomaturitySecuritiesUnrecognizedHoldingGain_831DA61CC595071897AC202D80C8767E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_HeldToMaturitySecuritiesAbstract_ED9BB6DF5F8E552A8B84202D80C8032A" xlink:to="loc_us-gaap_HeldtomaturitySecuritiesUnrecognizedHoldingGain_831DA61CC595071897AC202D80C8767E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_D3E32500CECCBCF11014202D80C8365B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_HeldToMaturitySecuritiesAbstract_ED9BB6DF5F8E552A8B84202D80C8032A" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_D3E32500CECCBCF11014202D80C8365B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/HeldToMaturitySecuritiesDetails1" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_DA286F13F103BEB655AA202D8230FBCE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_964271ECFC4130B7DEBD202D823057E1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_DA286F13F103BEB655AA202D8230FBCE" xlink:to="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_964271ECFC4130B7DEBD202D823057E1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtSecurityAxis" xlink:label="loc_us-gaap_DebtSecurityAxis_377219773D916F4494F2202D82302F2A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_964271ECFC4130B7DEBD202D823057E1" xlink:to="loc_us-gaap_DebtSecurityAxis_377219773D916F4494F2202D82302F2A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_5502684EAB7FB8687B47202D82301664_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtSecurityAxis_377219773D916F4494F2202D82302F2A" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_5502684EAB7FB8687B47202D82301664_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_5502684EAB7FB8687B47202D82301664" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtSecurityAxis_377219773D916F4494F2202D82302F2A" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_5502684EAB7FB8687B47202D82301664" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_268AA1F67CD50D1630CA202D82306B21" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_5502684EAB7FB8687B47202D82301664" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_268AA1F67CD50D1630CA202D82306B21" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_DA286F13F103BEB655AA202D8230FBCE" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_8380E5803778F1F33EEF202D8230394D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_8380E5803778F1F33EEF202D8230394D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughThreeYearsNetCarryingAmount" xlink:label="loc_lpla_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughThreeYearsNetCarryingAmount_8E1CA4E9ED44B6332460202D8230C75C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:to="loc_lpla_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughThreeYearsNetCarryingAmount_8E1CA4E9ED44B6332460202D8230C75C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmount_1092C569FE3AE2BB1842202D823058FC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmount_1092C569FE3AE2BB1842202D823058FC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_3C469614A2CB04F09B0C202D82309B13" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_3C469614A2CB04F09B0C202D82309B13" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue" xlink:label="loc_lpla_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue_4151C3DDC4865B5CCDA5202D8230E64F" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:to="loc_lpla_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue_4151C3DDC4865B5CCDA5202D8230E64F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValue_AFFAEA0C8EA81BF57638202D8230990B" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAbstract_9D1CDAAC959BF9D6EC59202D82301C88" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValue_AFFAEA0C8EA81BF57638202D8230990B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/IncomeTaxesDetailsTextuals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_8CDC94905A72889E015D202D93560D1C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_17FA2143AF88AB557078202D9356B5A9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_8CDC94905A72889E015D202D93560D1C" xlink:to="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_17FA2143AF88AB557078202D9356B5A9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_92E3ADFD71F79E53217BB13F58C3CDE9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_17FA2143AF88AB557078202D9356B5A9" xlink:to="loc_dei_LegalEntityAxis_92E3ADFD71F79E53217BB13F58C3CDE9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_BF95CD12FEDF51699770B13F58C46F48_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_92E3ADFD71F79E53217BB13F58C3CDE9" xlink:to="loc_dei_EntityDomain_BF95CD12FEDF51699770B13F58C46F48_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_BF95CD12FEDF51699770B13F58C46F48" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_92E3ADFD71F79E53217BB13F58C3CDE9" xlink:to="loc_dei_EntityDomain_BF95CD12FEDF51699770B13F58C46F48" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AffiliatedEntityMember" xlink:label="loc_us-gaap_AffiliatedEntityMember_BD367D982F0E735BFF71B13FB9E58E82" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BF95CD12FEDF51699770B13F58C46F48" xlink:to="loc_us-gaap_AffiliatedEntityMember_BD367D982F0E735BFF71B13FB9E58E82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_260822507E410E042185202D93565DFD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_17FA2143AF88AB557078202D9356B5A9" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_260822507E410E042185202D93565DFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_7207FF91295069CEBB19202D93568926_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_260822507E410E042185202D93565DFD" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_7207FF91295069CEBB19202D93568926_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_7207FF91295069CEBB19202D93568926" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_260822507E410E042185202D93565DFD" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_7207FF91295069CEBB19202D93568926" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CaliforniasIncomeMember" xlink:label="loc_lpla_CaliforniasIncomeMember_BBD8F375A9CF90C7CCCF202D9356E2D3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_7207FF91295069CEBB19202D93568926" xlink:to="loc_lpla_CaliforniasIncomeMember_BBD8F375A9CF90C7CCCF202D9356E2D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_77A5A6F8E42455331B35202D9356916D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_8CDC94905A72889E015D202D93560D1C" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_77A5A6F8E42455331B35202D9356916D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IncomeTaxesTextualsAbstract" xlink:label="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_8CDC94905A72889E015D202D93560D1C" xlink:to="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IncomeTaxReconciliationNondeductibleExpenseTransactionCosts" xlink:label="loc_lpla_IncomeTaxReconciliationNondeductibleExpenseTransactionCosts_1415158E90E9C7355ED9202D9356F0A6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_lpla_IncomeTaxReconciliationNondeductibleExpenseTransactionCosts_1415158E90E9C7355ED9202D9356F0A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_ED1396C735A5D431055A202D9356130A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_ED1396C735A5D431055A202D9356130A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_8C74B7ED7C3AF234D51E202D9356A6AA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_8C74B7ED7C3AF234D51E202D9356A6AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_F4E161032744B899BB80202D9356F35F" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_F4E161032744B899BB80202D9356F35F" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_UnrecognizedTaxBenefitAcquisitionOfAffiliatedEntities" xlink:label="loc_lpla_UnrecognizedTaxBenefitAcquisitionOfAffiliatedEntities_4321394FB12CCA45294E202D9356986D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_lpla_UnrecognizedTaxBenefitAcquisitionOfAffiliatedEntities_4321394FB12CCA45294E202D9356986D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_OtherUnrecognizedTaxBenefits" xlink:label="loc_lpla_OtherUnrecognizedTaxBenefits_FACC5CEF50C70AFCCC44202D9356273E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_lpla_OtherUnrecognizedTaxBenefits_FACC5CEF50C70AFCCC44202D9356273E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued_CF905025E50CB87B4202202D9356F3D7" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued_CF905025E50CB87B4202202D9356F3D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_FCACA2D1812D49E2CBED202D9356B878" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_FCACA2D1812D49E2CBED202D9356B878" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_46E0897271F18FF7DBAA202D93563A1F" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_46E0897271F18FF7DBAA202D93563A1F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_7A9301012F3302A592A9202D935605CD" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxesTextualsAbstract_99ED743893359E9D0E4C202D9356D861" xlink:to="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_7A9301012F3302A592A9202D935605CD" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/IndebtednessDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_B6C0A30A3CB640F0E284202D951CC944" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_5354951D4D7CE1383982202D951C299F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B6C0A30A3CB640F0E284202D951CC944" xlink:to="loc_us-gaap_DebtInstrumentTable_5354951D4D7CE1383982202D951C299F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2A6A896FD8EE1FAC31E3202D951CC88D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5354951D4D7CE1383982202D951C299F" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_2A6A896FD8EE1FAC31E3202D951CC88D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2A6A896FD8EE1FAC31E3202D951CC88D" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2A6A896FD8EE1FAC31E3202D951CC88D" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_DebtHedgedWithInterestRateSwapsMember" xlink:label="loc_lpla_DebtHedgedWithInterestRateSwapsMember_413496E73B581C6F46E1202D951C1C8D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A" xlink:to="loc_lpla_DebtHedgedWithInterestRateSwapsMember_413496E73B581C6F46E1202D951C1C8D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandThirteenTermLoansMember" xlink:label="loc_lpla_TwoThousandThirteenTermLoansMember_C4B3F9B83904F5ADDFDC202D951C3620" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A" xlink:to="loc_lpla_TwoThousandThirteenTermLoansMember_C4B3F9B83904F5ADDFDC202D951C3620" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandFifteenTermLoansMember" xlink:label="loc_lpla_TwoThousandFifteenTermLoansMember_061C758A9729ADF26054202D951CCAE0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A" xlink:to="loc_lpla_TwoThousandFifteenTermLoansMember_061C758A9729ADF26054202D951CCAE0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandSeventeenTermLoansMember" xlink:label="loc_lpla_TwoThousandSeventeenTermLoansMember_A432B4F9095EB15E797F202D951C73F2" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A" xlink:to="loc_lpla_TwoThousandSeventeenTermLoansMember_A432B4F9095EB15E797F202D951C73F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SeniorSubordinatedNotesMember" xlink:label="loc_us-gaap_SeniorSubordinatedNotesMember_99C6B4CE54BC2A169284202D951C79EB" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_61DD2B0F20CDC463D1C5202D951C803A" xlink:to="loc_us-gaap_SeniorSubordinatedNotesMember_99C6B4CE54BC2A169284202D951C79EB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract" xlink:label="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_61D4F003DE9BEAD87098202D951C52EA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B6C0A30A3CB640F0E284202D951CC944" xlink:to="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_61D4F003DE9BEAD87098202D951C52EA" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SeniorSecuredTermLoanAbstract" xlink:label="loc_lpla_SeniorSecuredTermLoanAbstract_5F0056A4A3E842E8FD34202D951CFF09" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_61D4F003DE9BEAD87098202D951C52EA" xlink:to="loc_lpla_SeniorSecuredTermLoanAbstract_5F0056A4A3E842E8FD34202D951CFF09" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_B67796776E461D0CB2D9202D951C2922" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SeniorSecuredTermLoanAbstract_5F0056A4A3E842E8FD34202D951CFF09" xlink:to="loc_us-gaap_SecuredDebt_B67796776E461D0CB2D9202D951C2922" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_BACB24F7913BCD5863DD202D951C1A7E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SeniorSecuredTermLoanAbstract_5F0056A4A3E842E8FD34202D951CFF09" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_BACB24F7913BCD5863DD202D951C1A7E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_UnsecuredDebt" xlink:label="loc_us-gaap_UnsecuredDebt_9E32DEC2914A0EA166AC202D951C26D4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_61D4F003DE9BEAD87098202D951C52EA" xlink:to="loc_us-gaap_UnsecuredDebt_9E32DEC2914A0EA166AC202D951C26D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_26179973414FAE2F57D4202D951CC95D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_61D4F003DE9BEAD87098202D951C52EA" xlink:to="loc_us-gaap_LongTermDebtCurrent_26179973414FAE2F57D4202D951CC95D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_4D1ED119DD02D3711B38202D951C635D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_61D4F003DE9BEAD87098202D951C52EA" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_4D1ED119DD02D3711B38202D951C635D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/IndebtednessDetailsTextuals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_D0BC6901794A5931188A202D97008089" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_DebtInstrumentTable_D0BC6901794A5931188A202D97008089" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_InterestBaseRateByTypeAxis" xlink:label="loc_lpla_InterestBaseRateByTypeAxis_978501F48CB56D52B413202D970083BB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_D0BC6901794A5931188A202D97008089" xlink:to="loc_lpla_InterestBaseRateByTypeAxis_978501F48CB56D52B413202D970083BB" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_InterestBaseRateByTypeDomain" xlink:label="loc_lpla_InterestBaseRateByTypeDomain_94AD28C16C11D2DB189E202D9700C1E2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_InterestBaseRateByTypeAxis_978501F48CB56D52B413202D970083BB" xlink:to="loc_lpla_InterestBaseRateByTypeDomain_94AD28C16C11D2DB189E202D9700C1E2_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_InterestBaseRateByTypeDomain" xlink:label="loc_lpla_InterestBaseRateByTypeDomain_94AD28C16C11D2DB189E202D9700C1E2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_InterestBaseRateByTypeAxis_978501F48CB56D52B413202D970083BB" xlink:to="loc_lpla_InterestBaseRateByTypeDomain_94AD28C16C11D2DB189E202D9700C1E2" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BaseRateMember" xlink:label="loc_lpla_BaseRateMember_A0F4982CA04263F54F89202D9700657B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_InterestBaseRateByTypeDomain_94AD28C16C11D2DB189E202D9700C1E2" xlink:to="loc_lpla_BaseRateMember_A0F4982CA04263F54F89202D9700657B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LiborRateMember" xlink:label="loc_lpla_LiborRateMember_67F1241F4AF4A9931620202D97006252" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_InterestBaseRateByTypeDomain_94AD28C16C11D2DB189E202D9700C1E2" xlink:to="loc_lpla_LiborRateMember_67F1241F4AF4A9931620202D97006252" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LiborRate3MonthMember" xlink:label="loc_lpla_LiborRate3MonthMember_8E9FE00A0874F5198CC6A88E00E0D67F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_LiborRateMember_67F1241F4AF4A9931620202D97006252" xlink:to="loc_lpla_LiborRate3MonthMember_8E9FE00A0874F5198CC6A88E00E0D67F" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LiborRate1MonthMember" xlink:label="loc_lpla_LiborRate1MonthMember_E39BA3C70386B842366DA8909E8AA210" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_LiborRateMember_67F1241F4AF4A9931620202D97006252" xlink:to="loc_lpla_LiborRate1MonthMember_E39BA3C70386B842366DA8909E8AA210" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AlternativeBaseRateMember" xlink:label="loc_lpla_AlternativeBaseRateMember_3D567D54885BA9645374A83D4B4545AA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_InterestBaseRateByTypeDomain_94AD28C16C11D2DB189E202D9700C1E2" xlink:to="loc_lpla_AlternativeBaseRateMember_3D567D54885BA9645374A83D4B4545AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4C8FE0C4A678BB174DFD202D9700FE52" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_D0BC6901794A5931188A202D97008089" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4C8FE0C4A678BB174DFD202D9700FE52" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4C8FE0C4A678BB174DFD202D9700FE52" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4C8FE0C4A678BB174DFD202D9700FE52" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandThirteenTermLoansMember" xlink:label="loc_lpla_TwoThousandThirteenTermLoansMember_829D801B3F673A6D6CB7202D9700CBB0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_TwoThousandThirteenTermLoansMember_829D801B3F673A6D6CB7202D9700CBB0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandFifteenTermLoansMember" xlink:label="loc_lpla_TwoThousandFifteenTermLoansMember_C828DF58A858E8551D1E202D9700E565" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_TwoThousandFifteenTermLoansMember_C828DF58A858E8551D1E202D9700E565" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandSeventeenTermLoansMember" xlink:label="loc_lpla_TwoThousandSeventeenTermLoansMember_9E340DABBDB0D1937944202D970010B6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_TwoThousandSeventeenTermLoansMember_9E340DABBDB0D1937944202D970010B6" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandElevenTermLoansMember" xlink:label="loc_lpla_TwoThousandElevenTermLoansMember_91BE62A549266F5E7965202D9700573A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_TwoThousandElevenTermLoansMember_91BE62A549266F5E7965202D9700573A" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandFifteenTermLoansAndTwoThousandSeventeenTermLoansMember" xlink:label="loc_lpla_TwoThousandFifteenTermLoansAndTwoThousandSeventeenTermLoansMember_C8BF798955B294DC99B2202D9700384A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_TwoThousandFifteenTermLoansAndTwoThousandSeventeenTermLoansMember_C8BF798955B294DC99B2202D9700384A" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SubsidiaryMember" xlink:label="loc_lpla_SubsidiaryMember_FF06452D5817D3205153202D9700F12B" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_SubsidiaryMember_FF06452D5817D3205153202D9700F12B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_Tranche2013Member" xlink:label="loc_lpla_Tranche2013Member_631C6EC49F004839B20FA868EECC81CE" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_Tranche2013Member_631C6EC49F004839B20FA868EECC81CE" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_Tranche2011Member" xlink:label="loc_lpla_Tranche2011Member_48DCE9E0616085A4FF04A86CDAE61D4E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_Tranche2011Member_48DCE9E0616085A4FF04A86CDAE61D4E" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TwoThousandFifteenNotesMember" xlink:label="loc_lpla_TwoThousandFifteenNotesMember_D89F76A1C90C7C6A67B3202D97006939" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_TwoThousandFifteenNotesMember_D89F76A1C90C7C6A67B3202D97006939" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SeniorSubordinatedNotesMember" xlink:label="loc_us-gaap_SeniorSubordinatedNotesMember_06D44B11987337F1DE52202D9700941E" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_us-gaap_SeniorSubordinatedNotesMember_06D44B11987337F1DE52202D9700941E" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BankLoansPayableMember" xlink:label="loc_lpla_BankLoansPayableMember_7A7DD34BCE2BAC8D56EE202D97004EC3" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_010CBFF97894F1E759F3202D9700AFE4" xlink:to="loc_lpla_BankLoansPayableMember_7A7DD34BCE2BAC8D56EE202D97004EC3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_AE0A61964B5811316B64202D9700A465" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_D0BC6901794A5931188A202D97008089" xlink:to="loc_us-gaap_RangeAxis_AE0A61964B5811316B64202D9700A465" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_92DEE1D2C8ABD69A07D7202D97008186_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_AE0A61964B5811316B64202D9700A465" xlink:to="loc_us-gaap_RangeMember_92DEE1D2C8ABD69A07D7202D97008186_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_92DEE1D2C8ABD69A07D7202D97008186" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_AE0A61964B5811316B64202D9700A465" xlink:to="loc_us-gaap_RangeMember_92DEE1D2C8ABD69A07D7202D97008186" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_57431DC146E6D47B2DD9202D9700E3A3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_92DEE1D2C8ABD69A07D7202D97008186" xlink:to="loc_us-gaap_MinimumMember_57431DC146E6D47B2DD9202D9700E3A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_66C656904AD2FB2DC87D202D97006FCB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_92DEE1D2C8ABD69A07D7202D97008186" xlink:to="loc_us-gaap_MaximumMember_66C656904AD2FB2DC87D202D97006FCB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_A51C87A096BEC5D3C233202D9700E0CC" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_D0BC6901794A5931188A202D97008089" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_A51C87A096BEC5D3C233202D9700E0CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_0CBE5B549E5835CD31EE202D970071BC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_A51C87A096BEC5D3C233202D9700E0CC" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_0CBE5B549E5835CD31EE202D970071BC_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_0CBE5B549E5835CD31EE202D970071BC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_A51C87A096BEC5D3C233202D9700E0CC" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_0CBE5B549E5835CD31EE202D970071BC" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TermLoansMember" xlink:label="loc_lpla_TermLoansMember_37A7E03FC2AF6A5F88E5202D97005837" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_0CBE5B549E5835CD31EE202D970071BC" xlink:to="loc_lpla_TermLoansMember_37A7E03FC2AF6A5F88E5202D97005837" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RevolvingLineOfCreditMember" xlink:label="loc_lpla_RevolvingLineOfCreditMember_C5F271C5BA3B73A48C9F202D97001DBA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_0CBE5B549E5835CD31EE202D970071BC" xlink:to="loc_lpla_RevolvingLineOfCreditMember_C5F271C5BA3B73A48C9F202D97001DBA" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_BenchmarkShortTermInterestRate" xlink:label="loc_lpla_BenchmarkShortTermInterestRate_43115840806CB5764C36A888ACA503F7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_lpla_BenchmarkShortTermInterestRate_43115840806CB5764C36A888ACA503F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_69F3A2BD8EADE81BA4F6202D9700BF6C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_69F3A2BD8EADE81BA4F6202D9700BF6C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_C0DAAD7BC344370FB990202D9700C5BE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_C0DAAD7BC344370FB990202D9700C5BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_C48B9EE196838310B3C1202D9700B096" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_C48B9EE196838310B3C1202D9700B096" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LineOfCreditFacilityMaturityPeriodExtended" xlink:label="loc_lpla_LineOfCreditFacilityMaturityPeriodExtended_F8E93E313C3ACA570F52202D9700D25C" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_lpla_LineOfCreditFacilityMaturityPeriodExtended_F8E93E313C3ACA570F52202D9700D25C" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LineOfCreditFacilityMatured" xlink:label="loc_lpla_LineOfCreditFacilityMatured_D5B76CB9338B4735BE09202D97007694" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_lpla_LineOfCreditFacilityMatured_D5B76CB9338B4735BE09202D97007694" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate_FA2F2CBE5BD82B30B0B9202D9700E030" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate_FA2F2CBE5BD82B30B0B9202D9700E030" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LineOfCreditFacilityMaximumBorrowingCapacityBeforeAmendment" xlink:label="loc_lpla_LineOfCreditFacilityMaximumBorrowingCapacityBeforeAmendment_38E3CBA2C8B04F3F22EB202D9700F5CC" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_lpla_LineOfCreditFacilityMaximumBorrowingCapacityBeforeAmendment_38E3CBA2C8B04F3F22EB202D9700F5CC" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LineOfCreditFacilityToSupportRelatedPartyDebt" xlink:label="loc_lpla_LineOfCreditFacilityToSupportRelatedPartyDebt_4180D3084309042E048F202D9700ADDF" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_lpla_LineOfCreditFacilityToSupportRelatedPartyDebt_4180D3084309042E048F202D9700ADDF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_FF02C7402D7F502A6494202D9700FF3E" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_FF02C7402D7F502A6494202D9700FF3E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_15E6572B409F81EC7C17202D970004E0" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_15E6572B409F81EC7C17202D970004E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_DE6507B49C4D6A21FE5A202D97005212" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_DE6507B49C4D6A21FE5A202D97005212" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RedemptionPriceAsPercentageOfPrincipalAmount" xlink:label="loc_lpla_RedemptionPriceAsPercentageOfPrincipalAmount_5067CFF24EA003F38197202D9700BB35" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_lpla_RedemptionPriceAsPercentageOfPrincipalAmount_5067CFF24EA003F38197202D9700BB35" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ExtinguishmentOfDebtExcludingInterest" xlink:label="loc_lpla_ExtinguishmentOfDebtExcludingInterest_D0DAA80760103F354F07202D97001A57" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_lpla_ExtinguishmentOfDebtExcludingInterest_D0DAA80760103F354F07202D97001A57" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ExtinguishmentOfDebtAmount" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_94CB3728245845F61AE1202D9700643A" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_94CB3728245845F61AE1202D9700643A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_A1F44658D4A7BA3FF5AC202D9700FD39" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_A1F44658D4A7BA3FF5AC202D9700FD39" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_2D12312A5568264745EF202D9700AAF7" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_2D12312A5568264745EF202D9700AAF7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_B3A7EB8CD589684CAB2C202D97006C88" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0FD72ECAD2A191ABD0DA202D97004EA3" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_B3A7EB8CD589684CAB2C202D97006C88" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/IntangibleAssetsDetails1" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_D7D63032D7A216DE7F939D800923B30C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_07621E09280E78B6341D9D8009235647" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_D7D63032D7A216DE7F939D800923B30C" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_07621E09280E78B6341D9D8009235647" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_09CB76434E920DD36C479D8009238D0B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_07621E09280E78B6341D9D8009235647" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_09CB76434E920DD36C479D8009238D0B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6056170C58186AA82B709D80092322C2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_09CB76434E920DD36C479D8009238D0B" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6056170C58186AA82B709D80092322C2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6056170C58186AA82B709D80092322C2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_09CB76434E920DD36C479D8009238D0B" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6056170C58186AA82B709D80092322C2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_D7D63032D7A216DE7F939D800923B30C" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FutureAmortizationExpenseYearOne" xlink:label="loc_us-gaap_FutureAmortizationExpenseYearOne_E5F0A9038658277ED421202D8E550ED7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:to="loc_us-gaap_FutureAmortizationExpenseYearOne_E5F0A9038658277ED421202D8E550ED7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FutureAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FutureAmortizationExpenseYearTwo_6AB00881BC3B4C90789B202D8E55BA31" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:to="loc_us-gaap_FutureAmortizationExpenseYearTwo_6AB00881BC3B4C90789B202D8E55BA31" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FutureAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FutureAmortizationExpenseYearThree_FF5FBAB35251C4ABEF05202D8E554EBC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:to="loc_us-gaap_FutureAmortizationExpenseYearThree_FF5FBAB35251C4ABEF05202D8E554EBC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FutureAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FutureAmortizationExpenseYearFour_AB6C85226B76932661AB202D8E555356" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:to="loc_us-gaap_FutureAmortizationExpenseYearFour_AB6C85226B76932661AB202D8E555356" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FutureAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FutureAmortizationExpenseYearFive_C047A88FD3184D1AE634202D8E556624" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:to="loc_us-gaap_FutureAmortizationExpenseYearFive_C047A88FD3184D1AE634202D8E556624" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FutureAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FutureAmortizationExpenseAfterYearFive_2C7523726E8C0683FABC202D8E5568B3" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:to="loc_us-gaap_FutureAmortizationExpenseAfterYearFive_2C7523726E8C0683FABC202D8E5568B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpense" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpense_A233254771B090A457D9202D8E559A76" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_839271F8EDF81A706130202D8E552F22" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpense_A233254771B090A457D9202D8E559A76" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/NetCapitalAndRegulatoryRequirementsDetails" xlink:type="extended">
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesLineItems" xlink:label="loc_lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesLineItems_75FFFE32BFCAD67422F5202DAE7085DF" xlink:type="locator" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesTable" xlink:label="loc_lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesTable_FCE3DC18B93BA2C9C700202DAE70C92F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesLineItems_75FFFE32BFCAD67422F5202DAE7085DF" xlink:to="loc_lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesTable_FCE3DC18B93BA2C9C700202DAE70C92F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_CEF6D75950D57792D2B3202DAE706682" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesTable_FCE3DC18B93BA2C9C700202DAE70C92F" xlink:to="loc_dei_LegalEntityAxis_CEF6D75950D57792D2B3202DAE706682" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4C2C2953D7733528B02084E4E65BE07B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_CEF6D75950D57792D2B3202DAE706682" xlink:to="loc_dei_EntityDomain_4C2C2953D7733528B02084E4E65BE07B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4C2C2953D7733528B02084E4E65BE07B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_CEF6D75950D57792D2B3202DAE706682" xlink:to="loc_dei_EntityDomain_4C2C2953D7733528B02084E4E65BE07B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LplFinancialLlcMember" xlink:label="loc_lpla_LplFinancialLlcMember_8FBDBEF0B8095229F752A6D847C32FF1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4C2C2953D7733528B02084E4E65BE07B" xlink:to="loc_lpla_LplFinancialLlcMember_8FBDBEF0B8095229F752A6D847C32FF1" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_UvestFinancialServicesGroupMember" xlink:label="loc_lpla_UvestFinancialServicesGroupMember_0FC2095A1DE4A9EBA45B202DAE70D39F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4C2C2953D7733528B02084E4E65BE07B" xlink:to="loc_lpla_UvestFinancialServicesGroupMember_0FC2095A1DE4A9EBA45B202DAE70D39F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RegulatoryCapitalRequirementsAbstract" xlink:label="loc_us-gaap_RegulatoryCapitalRequirementsAbstract_04A393EFC7B08AA4132C202DAE704950" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ScheduleOfNetCapitalAndNetCapitalRequirementsForCompanysBrokerDealerSubsidiariesLineItems_75FFFE32BFCAD67422F5202DAE7085DF" xlink:to="loc_us-gaap_RegulatoryCapitalRequirementsAbstract_04A393EFC7B08AA4132C202DAE704950" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCapital" xlink:label="loc_us-gaap_NetCapital_601866FA025BDCD8DF72202DAE70A1BA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryCapitalRequirementsAbstract_04A393EFC7B08AA4132C202DAE704950" xlink:to="loc_us-gaap_NetCapital_601866FA025BDCD8DF72202DAE70A1BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MinimumNetCapitalRequiredForBrokerDealerSubsidiary" xlink:label="loc_us-gaap_MinimumNetCapitalRequiredForBrokerDealerSubsidiary_6DBC4288639CB3CAC197202DAE7007B8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryCapitalRequirementsAbstract_04A393EFC7B08AA4132C202DAE704950" xlink:to="loc_us-gaap_MinimumNetCapitalRequiredForBrokerDealerSubsidiary_6DBC4288639CB3CAC197202DAE7007B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ExcessNetCapitalAt1500Percent" xlink:label="loc_us-gaap_ExcessNetCapitalAt1500Percent_9D2F7E3BAA2994E84F60202DAE701EB8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryCapitalRequirementsAbstract_04A393EFC7B08AA4132C202DAE704950" xlink:to="loc_us-gaap_ExcessNetCapitalAt1500Percent_9D2F7E3BAA2994E84F60202DAE701EB8" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/OrganizationAndDescriptionOfCompanyDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetLineItems" xlink:label="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetLineItems_DC6752C9FE24F12EBE00398DF60E1E03" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable" xlink:label="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_DC58E1CE6E3D663481E2398DF60E48DD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetLineItems_DC6752C9FE24F12EBE00398DF60E1E03" xlink:to="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_DC58E1CE6E3D663481E2398DF60E48DD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_6B72339AEB2319542F3B398DF60EF598" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTable_DC58E1CE6E3D663481E2398DF60E48DD" xlink:to="loc_dei_LegalEntityAxis_6B72339AEB2319542F3B398DF60EF598" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_6B72339AEB2319542F3B398DF60EF598" xlink:to="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_6B72339AEB2319542F3B398DF60EF598" xlink:to="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LplFinancialLlcMember" xlink:label="loc_lpla_LplFinancialLlcMember_609EC28C57D218FF61CBA6B91F7EB2B5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:to="loc_lpla_LplFinancialLlcMember_609EC28C57D218FF61CBA6B91F7EB2B5" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_UvestMember" xlink:label="loc_lpla_UvestMember_92529181814A74C126EC398DF60E3699" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:to="loc_lpla_UvestMember_92529181814A74C126EC398DF60E3699" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LplIndependentAdvisorMember" xlink:label="loc_lpla_LplIndependentAdvisorMember_69FF785C2E3DFB19B7B6A6B9DCACC6A0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:to="loc_lpla_LplIndependentAdvisorMember_69FF785C2E3DFB19B7B6A6B9DCACC6A0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IndependentAdvisorsGroupCorporationMember" xlink:label="loc_lpla_IndependentAdvisorsGroupCorporationMember_523BB6400418E4019A75A6BA53C81847" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:to="loc_lpla_IndependentAdvisorsGroupCorporationMember_523BB6400418E4019A75A6BA53C81847" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LplInsuranceAssociateMember" xlink:label="loc_lpla_LplInsuranceAssociateMember_57173374A0784DBDFB17A6BAD7292D9B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:to="loc_lpla_LplInsuranceAssociateMember_57173374A0784DBDFB17A6BAD7292D9B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_LplHoldingsMember" xlink:label="loc_lpla_LplHoldingsMember_CC131E044B4339D19DC1398DF60E414E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:to="loc_lpla_LplHoldingsMember_CC131E044B4339D19DC1398DF60E414E" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_PtcHoldingsIncMember" xlink:label="loc_lpla_PtcHoldingsIncMember_B79BF350F76E610C8356398DF60ED4ED" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BA92A5FD3A4B7A08047C398DF60E0FAF" xlink:to="loc_lpla_PtcHoldingsIncMember_B79BF350F76E610C8356398DF60ED4ED" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_OwnershipInterestPercentageInSubsidiary" xlink:label="loc_lpla_OwnershipInterestPercentageInSubsidiary_6C1EAD39556515B5727C398DF60EFF1A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetLineItems_DC6752C9FE24F12EBE00398DF60E1E03" xlink:to="loc_lpla_OwnershipInterestPercentageInSubsidiary_6C1EAD39556515B5727C398DF60EFF1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NumberOfStatesInWhichEntityOperates" xlink:label="loc_us-gaap_NumberOfStatesInWhichEntityOperates_93D5FC53DC3A01063351398DF60EE3B7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetLineItems_DC6752C9FE24F12EBE00398DF60E1E03" xlink:to="loc_us-gaap_NumberOfStatesInWhichEntityOperates_93D5FC53DC3A01063351398DF60EE3B7" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/RelatedPartyTransactions" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_3747902CC0F76851BD7096F48256895A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_804680B4A9A3FEFE197896F48247B13E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3747902CC0F76851BD7096F48256895A" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_804680B4A9A3FEFE197896F48247B13E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6941F079611058BA8E3796F482561C60" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_804680B4A9A3FEFE197896F48247B13E" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6941F079611058BA8E3796F482561C60" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_586DC516D431614991A096F482562C16_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6941F079611058BA8E3796F482561C60" xlink:to="loc_us-gaap_RelatedPartyDomain_586DC516D431614991A096F482562C16_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_586DC516D431614991A096F482562C16" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6941F079611058BA8E3796F482561C60" xlink:to="loc_us-gaap_RelatedPartyDomain_586DC516D431614991A096F482562C16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:label="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_EF9D3FD21C9A76903887202DAB92B447" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3747902CC0F76851BD7096F48256895A" xlink:to="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_EF9D3FD21C9A76903887202DAB92B447" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_1391E6FD56A8DD43C247202DAC2EB569" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_1391E6FD56A8DD43C247202DAC2EB569" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_18C7CD954EB448120AB0202DAC2E3C82" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_1391E6FD56A8DD43C247202DAC2EB569" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_18C7CD954EB448120AB0202DAC2E3C82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_18C7CD954EB448120AB0202DAC2E3C82" xlink:to="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_18C7CD954EB448120AB0202DAC2E3C82" xlink:to="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ArtisanPartnersLimitedPartnershipMember" xlink:label="loc_lpla_ArtisanPartnersLimitedPartnershipMember_89AB87819AED25418CCB202DAC2E5721" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_ArtisanPartnersLimitedPartnershipMember_89AB87819AED25418CCB202DAC2E5721" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AmericanBeaconAdvisorMember" xlink:label="loc_lpla_AmericanBeaconAdvisorMember_BED723A69EAA91D1C34B202DAC2E540B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_AmericanBeaconAdvisorMember_BED723A69EAA91D1C34B202DAC2E540B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_XojetMember" xlink:label="loc_lpla_XojetMember_7E314D8ED88E8D2126D9202DAC2EBB94" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_XojetMember_7E314D8ED88E8D2126D9202DAC2EBB94" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SungardDataSystemsMember" xlink:label="loc_lpla_SungardDataSystemsMember_0A7F1E22C9766C18684C202DAC2EE5CD" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_SungardDataSystemsMember_0A7F1E22C9766C18684C202DAC2EE5CD" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AplifiIncMember" xlink:label="loc_lpla_AplifiIncMember_C13CB96E44743E58807E202DAC2ED709" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_AplifiIncMember_C13CB96E44743E58807E202DAC2ED709" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TpgCapitalMember" xlink:label="loc_lpla_TpgCapitalMember_40560859D71FD95928F5202DAC2EDCC9" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_TpgCapitalMember_40560859D71FD95928F5202DAC2EDCC9" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_UvestFinancialServicesGroupIncMember" xlink:label="loc_lpla_UvestFinancialServicesGroupIncMember_E2FBD13FED8C61EF0C86A08F35DB30A1" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_UvestFinancialServicesGroupIncMember_E2FBD13FED8C61EF0C86A08F35DB30A1" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CresaPartnersMember" xlink:label="loc_lpla_CresaPartnersMember_F81BF41B9905B7121C34202DAC2E34A5" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_CresaPartnersMember_F81BF41B9905B7121C34202DAC2E34A5" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AlixPartnersMember" xlink:label="loc_lpla_AlixPartnersMember_B0C186AE2EC42242C840202DAC2E884A" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_925D332951C70159D83E202DAC2E143B" xlink:to="loc_lpla_AlixPartnersMember_B0C186AE2EC42242C840202DAC2E884A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty" xlink:label="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_80493857BAE728C34334202DAC2EA09B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:to="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_80493857BAE728C34334202DAC2EA09B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RelatedPartyTransactionRevenuesFromTransactionsWithRelatedParty" xlink:label="loc_us-gaap_RelatedPartyTransactionRevenuesFromTransactionsWithRelatedParty_4A60D054B43D46A950E9202DAC2E832E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:to="loc_us-gaap_RelatedPartyTransactionRevenuesFromTransactionsWithRelatedParty_4A60D054B43D46A950E9202DAC2E832E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DueFromRelatedParties" xlink:label="loc_us-gaap_DueFromRelatedParties_47BE5A5519F419705829202DAC2E9C81" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:to="loc_us-gaap_DueFromRelatedParties_47BE5A5519F419705829202DAC2E9C81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DueToRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_86C947FABBA18CFA2D10202DAC2E8144" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_86C947FABBA18CFA2D10202DAC2E8144" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_StockholdersLoans" xlink:label="loc_lpla_StockholdersLoans_19E33040B27F5E6802EB202DAC2E01C0" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:to="loc_lpla_StockholdersLoans_19E33040B27F5E6802EB202DAC2E01C0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_StockholderLoanOutstandingAmount" xlink:label="loc_lpla_StockholderLoanOutstandingAmount_88705926755C0764418A202DAC2EEDEE" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_3361526B8F91437C18F7202DAC2E8E70" xlink:to="loc_lpla_StockholderLoanOutstandingAmount_88705926755C0764418A202DAC2EEDEE" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/RestructuringTableDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8C95A966603626F2A20C0FCC1BF2785A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8C95A966603626F2A20C0FCC1BF2785A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_57AF53BF489CD5B85D2DF715F54BDB44" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8C95A966603626F2A20C0FCC1BF2785A" xlink:to="loc_dei_LegalEntityAxis_57AF53BF489CD5B85D2DF715F54BDB44" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_B75645058A552A95DA15F71F2B9F6D0D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_57AF53BF489CD5B85D2DF715F54BDB44" xlink:to="loc_dei_EntityDomain_B75645058A552A95DA15F71F2B9F6D0D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2011/dei-2011-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_B75645058A552A95DA15F71F2B9F6D0D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_57AF53BF489CD5B85D2DF715F54BDB44" xlink:to="loc_dei_EntityDomain_B75645058A552A95DA15F71F2B9F6D0D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AffiliatedEntityMember" xlink:label="loc_us-gaap_AffiliatedEntityMember_FAF62A6F4C1891097CE3F715F655BAE1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_B75645058A552A95DA15F71F2B9F6D0D" xlink:to="loc_us-gaap_AffiliatedEntityMember_FAF62A6F4C1891097CE3F715F655BAE1" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_UvestFinancialServicesGroupMember" xlink:label="loc_lpla_UvestFinancialServicesGroupMember_22A902222AF59599E2C5F71CD0D6E8AB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_B75645058A552A95DA15F71F2B9F6D0D" xlink:to="loc_lpla_UvestFinancialServicesGroupMember_22A902222AF59599E2C5F71CD0D6E8AB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_033D0994074FC15E8DCB0FCC1BF20FD2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8C95A966603626F2A20C0FCC1BF2785A" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_033D0994074FC15E8DCB0FCC1BF20FD2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_FAB4EA87BD5D608DA7270FCC1BF2B174_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_033D0994074FC15E8DCB0FCC1BF20FD2" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_FAB4EA87BD5D608DA7270FCC1BF2B174_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_FAB4EA87BD5D608DA7270FCC1BF2B174" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_033D0994074FC15E8DCB0FCC1BF20FD2" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_FAB4EA87BD5D608DA7270FCC1BF2B174" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringChargesMember" xlink:label="loc_us-gaap_RestructuringChargesMember_8A999AE678CA3014B32B0FD341C6121E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_FAB4EA87BD5D608DA7270FCC1BF2B174" xlink:to="loc_us-gaap_RestructuringChargesMember_8A999AE678CA3014B32B0FD341C6121E" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ConversionAndTransferCostsMember" xlink:label="loc_lpla_ConversionAndTransferCostsMember_5F53C3B3FD8D89CA8BDC101624E23E78" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringChargesMember_8A999AE678CA3014B32B0FD341C6121E" xlink:to="loc_lpla_ConversionAndTransferCostsMember_5F53C3B3FD8D89CA8BDC101624E23E78" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ContractTerminationMember" xlink:label="loc_us-gaap_ContractTerminationMember_28BD106E035E1530B53510093149363D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringChargesMember_8A999AE678CA3014B32B0FD341C6121E" xlink:to="loc_us-gaap_ContractTerminationMember_28BD106E035E1530B53510093149363D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AdvisorRetentionAndRelatedBenefitsMember" xlink:label="loc_lpla_AdvisorRetentionAndRelatedBenefitsMember_6219018E2087B0730C6210191CDB1821" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringChargesMember_8A999AE678CA3014B32B0FD341C6121E" xlink:to="loc_lpla_AdvisorRetentionAndRelatedBenefitsMember_6219018E2087B0730C6210191CDB1821" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ImpairmentInValueOfAssetMember" xlink:label="loc_us-gaap_ImpairmentInValueOfAssetMember_C59A87BE293734549B76100EBFF0F288" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringChargesMember_8A999AE678CA3014B32B0FD341C6121E" xlink:to="loc_us-gaap_ImpairmentInValueOfAssetMember_C59A87BE293734549B76100EBFF0F288" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RestructuringRelatedCostsExcludedFromTotalRestructuringCostEstimateMember" xlink:label="loc_lpla_RestructuringRelatedCostsExcludedFromTotalRestructuringCostEstimateMember_CC9A724DBE40BD052431B05EB3973CED" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_FAB4EA87BD5D608DA7270FCC1BF2B174" xlink:to="loc_lpla_RestructuringRelatedCostsExcludedFromTotalRestructuringCostEstimateMember_CC9A724DBE40BD052431B05EB3973CED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="loc_us-gaap_RestructuringReserveRollForward_ABDB930AD6557788DD81B054A760E833" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_us-gaap_RestructuringReserveRollForward_ABDB930AD6557788DD81B054A760E833" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_1F44D6F0FD8803A1A47F101E3324CDE2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_ABDB930AD6557788DD81B054A760E833" xlink:to="loc_us-gaap_RestructuringReserve_1F44D6F0FD8803A1A47F101E3324CDE2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringReservePeriodExpense" xlink:label="loc_us-gaap_RestructuringReservePeriodExpense_A77D758ADD817413F6E4103157720BBA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_ABDB930AD6557788DD81B054A760E833" xlink:to="loc_us-gaap_RestructuringReservePeriodExpense_A77D758ADD817413F6E4103157720BBA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringReserveSettledWithCash" xlink:label="loc_us-gaap_RestructuringReserveSettledWithCash_80713BF05C89CED7DE871030B1F947DF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_ABDB930AD6557788DD81B054A760E833" xlink:to="loc_us-gaap_RestructuringReserveSettledWithCash_80713BF05C89CED7DE871030B1F947DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringReserveSettledWithoutCash" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash_080D58F1C432268C82A410335E33329B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_ABDB930AD6557788DD81B054A760E833" xlink:to="loc_us-gaap_RestructuringReserveSettledWithoutCash_080D58F1C432268C82A410335E33329B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost_59D13306F259C4E8B89A10349907D1C5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost_59D13306F259C4E8B89A10349907D1C5" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CapitalizedComputerSoftwareExpectedCumulativeCost" xlink:label="loc_lpla_CapitalizedComputerSoftwareExpectedCumulativeCost_C40B50C1112FC1B5C68BB05BAAE70D1C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_lpla_CapitalizedComputerSoftwareExpectedCumulativeCost_C40B50C1112FC1B5C68BB05BAAE70D1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsUsefulLifeMinimum" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsUsefulLifeMinimum_447797C5D805A9FB4595B073F8463BEC" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsUsefulLifeMinimum_447797C5D805A9FB4595B073F8463BEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsUsefulLifeMaximum" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsUsefulLifeMaximum_71DD568E9D53C55BF629B07491106C98" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsUsefulLifeMaximum_71DD568E9D53C55BF629B07491106C98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsToDevelopSoftware" xlink:label="loc_us-gaap_PaymentsToDevelopSoftware_3BBF7A32D8DC325532B7B05FBADB3E28" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_us-gaap_PaymentsToDevelopSoftware_3BBF7A32D8DC325532B7B05FBADB3E28" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CapitalizedComputerSoftwareGross" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareGross_F70CD1C4AD0197A39C33B062A8029BCC" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareGross_F70CD1C4AD0197A39C33B062A8029BCC" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CapitalizedComputerSoftwareAdditionsExpectedWithinNext12Months" xlink:label="loc_lpla_CapitalizedComputerSoftwareAdditionsExpectedWithinNext12Months_1350EE4E12E3622E7A5FB06965F7874E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_47EB34F9DF18267A96DD0FCC1BF2AE26" xlink:to="loc_lpla_CapitalizedComputerSoftwareAdditionsExpectedWithinNext12Months_1350EE4E12E3622E7A5FB06965F7874E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ShareBasedCompensationDetails" xlink:type="extended">
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesLineItems" xlink:label="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesLineItems_47D61DD5B63A06866346AC6DA6D99928" xlink:type="locator" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesTable" xlink:label="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesTable_664C7D43589CEA85A9DFAC68AF4D09F8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesLineItems_47D61DD5B63A06866346AC6DA6D99928" xlink:to="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesTable_664C7D43589CEA85A9DFAC68AF4D09F8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesByRecipientTypeAxis" xlink:label="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesByRecipientTypeAxis_92B7524463D47CCA26E2B12BB17BB3D3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesTable_664C7D43589CEA85A9DFAC68AF4D09F8" xlink:to="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesByRecipientTypeAxis_92B7524463D47CCA26E2B12BB17BB3D3" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain" xlink:label="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain_57E1F221DDB0980FA554B12BB18A5F2D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesByRecipientTypeAxis_92B7524463D47CCA26E2B12BB17BB3D3" xlink:to="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain_57E1F221DDB0980FA554B12BB18A5F2D_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain" xlink:label="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain_57E1F221DDB0980FA554B12BB18A5F2D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesByRecipientTypeAxis_92B7524463D47CCA26E2B12BB17BB3D3" xlink:to="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain_57E1F221DDB0980FA554B12BB18A5F2D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_6D7C56533B2925540A19B139E5C2FEF0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain_57E1F221DDB0980FA554B12BB18A5F2D" xlink:to="loc_us-gaap_EmployeeStockOptionMember_6D7C56533B2925540A19B139E5C2FEF0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AdvisorsAndFinancialInstitutionsMember" xlink:label="loc_lpla_AdvisorsAndFinancialInstitutionsMember_6EEEBFB1F72934D89061B139E6AB1829" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesRecipientTypeDomain_57E1F221DDB0980FA554B12BB18A5F2D" xlink:to="loc_lpla_AdvisorsAndFinancialInstitutionsMember_6EEEBFB1F72934D89061B139E6AB1829" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_9C2AD813A36F76C9C2B7202DA17016B0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ScheduleOfShareBasedCompensationArrangementsForEmployeesAndNonEmployeesLineItems_47D61DD5B63A06866346AC6DA6D99928" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_9C2AD813A36F76C9C2B7202DA17016B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm_73AD5AD0B96F334AE1CF202DA170C65A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_9C2AD813A36F76C9C2B7202DA17016B0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm_73AD5AD0B96F334AE1CF202DA170C65A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_F32CD4D1DAA727669726202DA1702D2C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_9C2AD813A36F76C9C2B7202DA17016B0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_F32CD4D1DAA727669726202DA1702D2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_A55B7CE43C1BE990EDAD202DA17073DD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_9C2AD813A36F76C9C2B7202DA17016B0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_A55B7CE43C1BE990EDAD202DA17073DD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_4CF51DB3EA64782502EE202DA17064A9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_9C2AD813A36F76C9C2B7202DA17016B0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_4CF51DB3EA64782502EE202DA17064A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_1035B46271B139689708202DA1703D4D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_9C2AD813A36F76C9C2B7202DA17016B0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_1035B46271B139689708202DA1703D4D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ShareBasedCompensationDetails2" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_95D4B0CA8653C29E2FA0202DA3E12A67" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_59F91EAD95D393D2A377202DA3E16665" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_95D4B0CA8653C29E2FA0202DA3E12A67" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_59F91EAD95D393D2A377202DA3E16665" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_E4622CDBD04EF9539707202DA3E1229C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_59F91EAD95D393D2A377202DA3E16665" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_E4622CDBD04EF9539707202DA3E1229C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_E4622CDBD04EF9539707202DA3E1229C" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_E4622CDBD04EF9539707202DA3E1229C" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RangeOneMember" xlink:label="loc_lpla_RangeOneMember_E5F1BF52301F84A0C5C4202DA3E12E5F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847" xlink:to="loc_lpla_RangeOneMember_E5F1BF52301F84A0C5C4202DA3E12E5F" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RangeTwoMember" xlink:label="loc_lpla_RangeTwoMember_51B2304A80054A337EF2202DA3E1F0D0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847" xlink:to="loc_lpla_RangeTwoMember_51B2304A80054A337EF2202DA3E1F0D0" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RangeThreeMember" xlink:label="loc_lpla_RangeThreeMember_B80E4E180082ABC9A125202DA3E168C8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847" xlink:to="loc_lpla_RangeThreeMember_B80E4E180082ABC9A125202DA3E168C8" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RangeFourMember" xlink:label="loc_lpla_RangeFourMember_BE26810ACAEFB726EBDB202DA3E19DF3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847" xlink:to="loc_lpla_RangeFourMember_BE26810ACAEFB726EBDB202DA3E19DF3" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_RangeFiveMember" xlink:label="loc_lpla_RangeFiveMember_18B9AC6AE1858D45E462202DA3E1225D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_B3C84B4B24BF744278CB202DA3E13847" xlink:to="loc_lpla_RangeFiveMember_18B9AC6AE1858D45E462202DA3E1225D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_95D4B0CA8653C29E2FA0202DA3E12A67" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_9083E2F91935C1E4281B202DA3E17764" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_9083E2F91935C1E4281B202DA3E17764" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_40F52E5AADCDE6A3A1D5202DA3E10C4F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_40F52E5AADCDE6A3A1D5202DA3E10C4F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_3A172F86208B86C1ED47202DA3E1003C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_3A172F86208B86C1ED47202DA3E1003C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm1_6051C079F6B0E59555E8202DA3E1B068" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm1_6051C079F6B0E59555E8202DA3E1B068" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_FC081921D4E1B76C4285202DA3E1F268" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_FC081921D4E1B76C4285202DA3E1F268" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_E802827241856259ACB1202DA3E11590" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_E802827241856259ACB1202DA3E11590" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_0B2D6DF3E408FCB02D9C202DA3E1D596" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_0BA35EFD6DFB73B2F49C202DA3E17649" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_0B2D6DF3E408FCB02D9C202DA3E1D596" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ShareBasedCompensationDetails3" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_615F9BFA0B9ECB619EEDAD8DF5EACC10" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_B6B14EC6285EA2C7C21BAD8D739EE0F5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_615F9BFA0B9ECB619EEDAD8DF5EACC10" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_B6B14EC6285EA2C7C21BAD8D739EE0F5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_59A46A10856F9726AE75AD8BE9949E88" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_B6B14EC6285EA2C7C21BAD8D739EE0F5" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_59A46A10856F9726AE75AD8BE9949E88" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_11BF30492279F0187B76AD8BE9949F3A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_59A46A10856F9726AE75AD8BE9949E88" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_11BF30492279F0187B76AD8BE9949F3A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_11BF30492279F0187B76AD8BE9949F3A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_59A46A10856F9726AE75AD8BE9949E88" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_11BF30492279F0187B76AD8BE9949F3A" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_DirectorRestrictedStockPlanMember" xlink:label="loc_lpla_DirectorRestrictedStockPlanMember_C1A80BAE579D5021DE60AD8C702896EF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_11BF30492279F0187B76AD8BE9949F3A" xlink:to="loc_lpla_DirectorRestrictedStockPlanMember_C1A80BAE579D5021DE60AD8C702896EF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_615F9BFA0B9ECB619EEDAD8DF5EACC10" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_4FA07F1A110BA6B11CB2202DA50A902A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_4FA07F1A110BA6B11CB2202DA50A902A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_C89C6042B2E8108A87A0202DA50AC873" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_C89C6042B2E8108A87A0202DA50AC873" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_163E096B123ADB7884F2202DA50ABF07" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_163E096B123ADB7884F2202DA50ABF07" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_FF692902BDB403A8EBBF202DA50A7B54" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_FF692902BDB403A8EBBF202DA50A7B54" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9A7D43857D2577647962202DA50A9F6C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9A7D43857D2577647962202DA50A9F6C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_4B7A9C180D9831719938202DA50A3339" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_4B7A9C180D9831719938202DA50A3339" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_A71583F18A3D0EE955CA202DA50AF418" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_A71583F18A3D0EE955CA202DA50AF418" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue_A4FEA3AEC9FA06C06852202DA50AA791" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_949ECEE2C0B54C4F2E6C202DA50A0354" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue_A4FEA3AEC9FA06C06852202DA50AA791" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/ShareBasedCompensationDetailsTextuals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AB9AE185B25984E27541202DA5B61FAB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AB9AE185B25984E27541202DA5B61FAB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IncomeTaxTransactionByApplicableTaxYearAxis" xlink:label="loc_lpla_IncomeTaxTransactionByApplicableTaxYearAxis_91D0ED2B0955BD7227A3ADAE8CD317AB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AB9AE185B25984E27541202DA5B61FAB" xlink:to="loc_lpla_IncomeTaxTransactionByApplicableTaxYearAxis_91D0ED2B0955BD7227A3ADAE8CD317AB" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IncomeTaxTransactionApplicableTaxYearDomain" xlink:label="loc_lpla_IncomeTaxTransactionApplicableTaxYearDomain_A882F244E405C4CFF8ADADBB183D36BB_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_IncomeTaxTransactionByApplicableTaxYearAxis_91D0ED2B0955BD7227A3ADAE8CD317AB" xlink:to="loc_lpla_IncomeTaxTransactionApplicableTaxYearDomain_A882F244E405C4CFF8ADADBB183D36BB_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_IncomeTaxTransactionApplicableTaxYearDomain" xlink:label="loc_lpla_IncomeTaxTransactionApplicableTaxYearDomain_A882F244E405C4CFF8ADADBB183D36BB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_IncomeTaxTransactionByApplicableTaxYearAxis_91D0ED2B0955BD7227A3ADAE8CD317AB" xlink:to="loc_lpla_IncomeTaxTransactionApplicableTaxYearDomain_A882F244E405C4CFF8ADADBB183D36BB" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TaxYearPriorToBalanceSheetDateMember" xlink:label="loc_lpla_TaxYearPriorToBalanceSheetDateMember_60C32D365AC6014280E7ADAFAD298548" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxTransactionApplicableTaxYearDomain_A882F244E405C4CFF8ADADBB183D36BB" xlink:to="loc_lpla_TaxYearPriorToBalanceSheetDateMember_60C32D365AC6014280E7ADAFAD298548" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TaxYear2YearsPriorToBalanceSheetDateMember" xlink:label="loc_lpla_TaxYear2YearsPriorToBalanceSheetDateMember_1BD4C8B6433E923394B4ADB187871CF9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxTransactionApplicableTaxYearDomain_A882F244E405C4CFF8ADADBB183D36BB" xlink:to="loc_lpla_TaxYear2YearsPriorToBalanceSheetDateMember_1BD4C8B6433E923394B4ADB187871CF9" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_TaxYear3YearsPriorToBalanceSheetDateMember" xlink:label="loc_lpla_TaxYear3YearsPriorToBalanceSheetDateMember_5A6C1A2E50914A9AD9A1ADB2539C1810" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_IncomeTaxTransactionApplicableTaxYearDomain_A882F244E405C4CFF8ADADBB183D36BB" xlink:to="loc_lpla_TaxYear3YearsPriorToBalanceSheetDateMember_5A6C1A2E50914A9AD9A1ADB2539C1810" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis_9C9B388FD099212D3AAF202DA5B6717D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AB9AE185B25984E27541202DA5B61FAB" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis_9C9B388FD099212D3AAF202DA5B6717D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis_9C9B388FD099212D3AAF202DA5B6717D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis_9C9B388FD099212D3AAF202DA5B6717D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_StockOptionAndWarrantPlansMember" xlink:label="loc_lpla_StockOptionAndWarrantPlansMember_5D04421EF142DCDF5089202DA5B69C89" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164" xlink:to="loc_lpla_StockOptionAndWarrantPlansMember_5D04421EF142DCDF5089202DA5B69C89" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_NonqualifiedDeferredCompensationPlanMember" xlink:label="loc_lpla_NonqualifiedDeferredCompensationPlanMember_9F2DC7AFDAC532D34D02202DA5B6B157" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164" xlink:to="loc_lpla_NonqualifiedDeferredCompensationPlanMember_9F2DC7AFDAC532D34D02202DA5B6B157" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_DirectorRestrictedStockPlanMember" xlink:label="loc_lpla_DirectorRestrictedStockPlanMember_29FD18ED86C3515CBFA5202DA5B6D4CC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164" xlink:to="loc_lpla_DirectorRestrictedStockPlanMember_29FD18ED86C3515CBFA5202DA5B6D4CC" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ShareReservationsMember" xlink:label="loc_lpla_ShareReservationsMember_48C02AB5824C9E3A7B49202DA5B6ADED" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D52150BBCEF8896797F6202DA5B68164" xlink:to="loc_lpla_ShareReservationsMember_48C02AB5824C9E3A7B49202DA5B6ADED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_3778D5DBA7D78FD03A24202DA5B69268" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AB9AE185B25984E27541202DA5B61FAB" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_3778D5DBA7D78FD03A24202DA5B69268" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_117F11FDE534762D87EA202DA5B6BCB6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_3778D5DBA7D78FD03A24202DA5B69268" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_117F11FDE534762D87EA202DA5B6BCB6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_117F11FDE534762D87EA202DA5B6BCB6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_3778D5DBA7D78FD03A24202DA5B69268" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_117F11FDE534762D87EA202DA5B6BCB6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IPOMember" xlink:label="loc_us-gaap_IPOMember_1FDBFCB52F1DB5F12649202DA5B6300B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_117F11FDE534762D87EA202DA5B6BCB6" xlink:to="loc_us-gaap_IPOMember_1FDBFCB52F1DB5F12649202DA5B6300B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_82E8846CDF6F2C6F3395202DA5B6797D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AB9AE185B25984E27541202DA5B61FAB" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_82E8846CDF6F2C6F3395202DA5B6797D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_86D5822E6CEF150D6DA3202DA5B64158_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_82E8846CDF6F2C6F3395202DA5B6797D" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_86D5822E6CEF150D6DA3202DA5B64158_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_86D5822E6CEF150D6DA3202DA5B64158" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_82E8846CDF6F2C6F3395202DA5B6797D" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_86D5822E6CEF150D6DA3202DA5B64158" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_6445A7C2022C976F7BBE202DA5B617B6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_86D5822E6CEF150D6DA3202DA5B64158" xlink:to="loc_us-gaap_EmployeeStockOptionMember_6445A7C2022C976F7BBE202DA5B617B6" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AdvisorsAndFinancialInstitutionsMember" xlink:label="loc_lpla_AdvisorsAndFinancialInstitutionsMember_895F0513B1889E22E06A202DA5B667C5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_86D5822E6CEF150D6DA3202DA5B64158" xlink:to="loc_lpla_AdvisorsAndFinancialInstitutionsMember_895F0513B1889E22E06A202DA5B667C5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum_4AC614CCB445BD0237A9202DA5C536AE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMinimum_4AC614CCB445BD0237A9202DA5C536AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum_973577D832F834674A56202DA5C595A8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodMaximum_973577D832F834674A56202DA5C595A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_B6D603521606CFC959C3202DA5C5C555" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_B6D603521606CFC959C3202DA5C5C555" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_AD4695328B4A794DAE96202DA5C5589E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_AD4695328B4A794DAE96202DA5C5589E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition_329D0391F402BD056911202DA5C54813" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition_329D0391F402BD056911202DA5C54813" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockUnitsOutstanding" xlink:label="loc_lpla_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockUnitsOutstanding_6EFB3D89A8C24B8241D5AD67F7BC807A" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_lpla_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockUnitsOutstanding_6EFB3D89A8C24B8241D5AD67F7BC807A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8B53E25475ED00B79054202DA5C5E98B" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8B53E25475ED00B79054202DA5C5E98B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ShareBasedCompensationArrangementSharesIssuedPricePerShare" xlink:label="loc_lpla_ShareBasedCompensationArrangementSharesIssuedPricePerShare_7316F9F54F0152D82BFE202DA5C5395C" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_lpla_ShareBasedCompensationArrangementSharesIssuedPricePerShare_7316F9F54F0152D82BFE202DA5C5395C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0D3C0D5359D6CAC2B3E6AD737BC05FAF" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0D3C0D5359D6CAC2B3E6AD737BC05FAF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_3F96D06F1B8C1E2B2845ADA70153AE52" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_3F96D06F1B8C1E2B2845ADA70153AE52" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions_BA318FF014A44902A212202DA5C5AFB9" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions_BA318FF014A44902A212202DA5C5AFB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_D691844C113A27BD063C202DA5C59D5F" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_D691844C113A27BD063C202DA5C59D5F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6F09CF7D1E2EC20BEE62202DA5C595BA" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6F09CF7D1E2EC20BEE62202DA5C595BA" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesReserved" xlink:label="loc_lpla_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesReserved_E6C93395D54723B130EF202DA5C58C9F" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6011007A6C76B8AA14AB202DA5C5756A" xlink:to="loc_lpla_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesReserved_E6C93395D54723B130EF202DA5C58C9F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_695BB09F62EF5C5CC57B024BE30180B4" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable" xlink:label="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_48A89E8B47A475829956024BE3004B80" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_695BB09F62EF5C5CC57B024BE30180B4" xlink:to="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_48A89E8B47A475829956024BE3004B80" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_77B953F5F61A44771D8F024BE301859A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_48A89E8B47A475829956024BE3004B80" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_77B953F5F61A44771D8F024BE301859A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_001F1B214A0796B20A23024BE30144E1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_77B953F5F61A44771D8F024BE301859A" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_001F1B214A0796B20A23024BE30144E1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_001F1B214A0796B20A23024BE30144E1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_77B953F5F61A44771D8F024BE301859A" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_001F1B214A0796B20A23024BE30144E1" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CashEquivalentsDaysToMaturityMaximum" xlink:label="loc_lpla_CashEquivalentsDaysToMaturityMaximum_7D7524B36DADACB0430D024E6E14713A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_695BB09F62EF5C5CC57B024BE30180B4" xlink:to="loc_lpla_CashEquivalentsDaysToMaturityMaximum_7D7524B36DADACB0430D024E6E14713A" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesDraftsPayableDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_48811DB9F89F5A2B764D076EA84C6476" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfShortTermDebtTable" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_A5EC2ED3EEA7F6BBFD1F076DD52FCFC2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_48811DB9F89F5A2B764D076EA84C6476" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_A5EC2ED3EEA7F6BBFD1F076DD52FCFC2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_CEFF77AFE40607BD81A0076A19CC8D14" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_A5EC2ED3EEA7F6BBFD1F076DD52FCFC2" xlink:to="loc_us-gaap_DebtInstrumentAxis_CEFF77AFE40607BD81A0076A19CC8D14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4EA1C63C7A9AB1C841A5076A19CC5758_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_CEFF77AFE40607BD81A0076A19CC8D14" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4EA1C63C7A9AB1C841A5076A19CC5758_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4EA1C63C7A9AB1C841A5076A19CC5758" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_CEFF77AFE40607BD81A0076A19CC8D14" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4EA1C63C7A9AB1C841A5076A19CC5758" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ClientActivitiesMember" xlink:label="loc_lpla_ClientActivitiesMember_228C5D116BA40F893242076A19EA8345" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4EA1C63C7A9AB1C841A5076A19CC5758" xlink:to="loc_lpla_ClientActivitiesMember_228C5D116BA40F893242076A19EA8345" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_CorporateOverdraftsMember" xlink:label="loc_lpla_CorporateOverdraftsMember_5AED5FD0FEEEEB72E561076A19FEAE49" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4EA1C63C7A9AB1C841A5076A19CC5758" xlink:to="loc_lpla_CorporateOverdraftsMember_5AED5FD0FEEEEB72E561076A19FEAE49" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DraftsPayable" xlink:label="loc_us-gaap_DraftsPayable_1253CF05E546A6065C6D0769E2AC4366" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_48811DB9F89F5A2B764D076EA84C6476" xlink:to="loc_us-gaap_DraftsPayable_1253CF05E546A6065C6D0769E2AC4366" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesFixedAssetsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_30B81105888055CD377C07563296277F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_565D6CA51FDD79F8514D075632961467" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_30B81105888055CD377C07563296277F" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_565D6CA51FDD79F8514D075632961467" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_19F46FBA32E731043930075632F0DD78" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_565D6CA51FDD79F8514D075632961467" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_19F46FBA32E731043930075632F0DD78" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_0E37EEB988E92926D213075635DEDA3D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_19F46FBA32E731043930075632F0DD78" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_0E37EEB988E92926D213075635DEDA3D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_0E37EEB988E92926D213075635DEDA3D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_19F46FBA32E731043930075632F0DD78" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_0E37EEB988E92926D213075635DEDA3D" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AffiliatedEntitiesDiscontinuedUseMember" xlink:label="loc_lpla_AffiliatedEntitiesDiscontinuedUseMember_C1747A0ACE059CB8DCF8075633224451" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_0E37EEB988E92926D213075635DEDA3D" xlink:to="loc_lpla_AffiliatedEntitiesDiscontinuedUseMember_C1747A0ACE059CB8DCF8075633224451" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_AbandonedLeaseLocationsMember" xlink:label="loc_lpla_AbandonedLeaseLocationsMember_2448EC305B10688BD0E30756334025C8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_0E37EEB988E92926D213075635DEDA3D" xlink:to="loc_lpla_AbandonedLeaseLocationsMember_2448EC305B10688BD0E30756334025C8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87E0CDA1918D0EBDE43E07563296DE46" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_565D6CA51FDD79F8514D075632961467" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87E0CDA1918D0EBDE43E07563296DE46" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2F4923DCB695595B5F2607563296F0F7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87E0CDA1918D0EBDE43E07563296DE46" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2F4923DCB695595B5F2607563296F0F7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2F4923DCB695595B5F2607563296F0F7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87E0CDA1918D0EBDE43E07563296DE46" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2F4923DCB695595B5F2607563296F0F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_TangibleAssetImpairmentCharges" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_2904CECA44FBEFC40038075632C899EC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_30B81105888055CD377C07563296277F" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_2904CECA44FBEFC40038075632C899EC" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesOtherOperatingExpenseDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ComponentOfOperatingOtherCostAndExpenseLineItems" xlink:label="loc_us-gaap_ComponentOfOperatingOtherCostAndExpenseLineItems_856D01B101C13FBED3F502087B759640" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ComponentOfOtherOperatingCostAndExpenseTable" xlink:label="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseTable_8E5F76FF6AB76EA1F0E202087B74FD7D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ComponentOfOperatingOtherCostAndExpenseLineItems_856D01B101C13FBED3F502087B759640" xlink:to="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseTable_8E5F76FF6AB76EA1F0E202087B74FD7D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_BA4D916DAC5E48284C61021164152DEE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseTable_8E5F76FF6AB76EA1F0E202087B74FD7D" xlink:to="loc_us-gaap_RangeAxis_BA4D916DAC5E48284C61021164152DEE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_913BB77F36AA6E426E960211641650F9_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_BA4D916DAC5E48284C61021164152DEE" xlink:to="loc_us-gaap_RangeMember_913BB77F36AA6E426E960211641650F9_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_913BB77F36AA6E426E960211641650F9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_BA4D916DAC5E48284C61021164152DEE" xlink:to="loc_us-gaap_RangeMember_913BB77F36AA6E426E960211641650F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_C1EFEE09509EA8CBBA48021186A54935" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_913BB77F36AA6E426E960211641650F9" xlink:to="loc_us-gaap_MaximumMember_C1EFEE09509EA8CBBA48021186A54935" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis" xlink:label="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_1D4ADFB866AC6E5EB97E02087B741582" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseTable_8E5F76FF6AB76EA1F0E202087B74FD7D" xlink:to="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_1D4ADFB866AC6E5EB97E02087B741582" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain" xlink:label="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain_0E72056FA06C41AD154102087B74BF5B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_1D4ADFB866AC6E5EB97E02087B741582" xlink:to="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain_0E72056FA06C41AD154102087B74BF5B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain" xlink:label="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain_0E72056FA06C41AD154102087B74BF5B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_1D4ADFB866AC6E5EB97E02087B741582" xlink:to="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain_0E72056FA06C41AD154102087B74BF5B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="loc_us-gaap_InterestExpenseMember_A7917800E6D45AA4EADD0210FD94751F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain_0E72056FA06C41AD154102087B74BF5B" xlink:to="loc_us-gaap_InterestExpenseMember_A7917800E6D45AA4EADD0210FD94751F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherOperatingExpenseMember" xlink:label="loc_us-gaap_OtherOperatingExpenseMember_5FAA286192885BAE063E020A48DCDB8B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentOfOtherOperatingCostAndExpenseNameDomain_0E72056FA06C41AD154102087B74BF5B" xlink:to="loc_us-gaap_OtherOperatingExpenseMember_5FAA286192885BAE063E020A48DCDB8B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherCostAndExpenseOperating" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_900F04F6BDB484C166AC0208F8005D0E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentOfOperatingOtherCostAndExpenseLineItems_856D01B101C13FBED3F502087B759640" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_900F04F6BDB484C166AC0208F8005D0E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesReceivablesFromAndPayablesToClientsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ValuationAllowanceLineItems" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_737472C48F7413A51D075815579B56BA" xlink:type="locator" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleForUncollectableAmountsDueFromClientsTable" xlink:label="loc_lpla_ScheduleForUncollectableAmountsDueFromClientsTable_A99ECD28723962DBD8F448C11EEFCE9F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_737472C48F7413A51D075815579B56BA" xlink:to="loc_lpla_ScheduleForUncollectableAmountsDueFromClientsTable_A99ECD28723962DBD8F448C11EEFCE9F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesAxis" xlink:label="loc_lpla_ReceivablesAxis_BCCE2DBA17FCE466939EB184C8E6376E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_ScheduleForUncollectableAmountsDueFromClientsTable_A99ECD28723962DBD8F448C11EEFCE9F" xlink:to="loc_lpla_ReceivablesAxis_BCCE2DBA17FCE466939EB184C8E6376E" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesDomain" xlink:label="loc_lpla_ReceivablesDomain_F9662220468B4972D9F9B1884B76366B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_ReceivablesAxis_BCCE2DBA17FCE466939EB184C8E6376E" xlink:to="loc_lpla_ReceivablesDomain_F9662220468B4972D9F9B1884B76366B_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesDomain" xlink:label="loc_lpla_ReceivablesDomain_F9662220468B4972D9F9B1884B76366B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_ReceivablesAxis_BCCE2DBA17FCE466939EB184C8E6376E" xlink:to="loc_lpla_ReceivablesDomain_F9662220468B4972D9F9B1884B76366B" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesFromClientsMember" xlink:label="loc_lpla_ReceivablesFromClientsMember_27508CD06F593674308CB187627DEEF5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ReceivablesDomain_F9662220468B4972D9F9B1884B76366B" xlink:to="loc_lpla_ReceivablesFromClientsMember_27508CD06F593674308CB187627DEEF5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_73283E79CD491686AD47B1AD906AFBC9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_737472C48F7413A51D075815579B56BA" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_73283E79CD491686AD47B1AD906AFBC9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_9FE2F6E5CCED4898A7AD202D6BBA7422" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_73283E79CD491686AD47B1AD906AFBC9" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_9FE2F6E5CCED4898A7AD202D6BBA7422" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_F21580999BD11D4370BDA70F62B8C9F4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_73283E79CD491686AD47B1AD906AFBC9" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_F21580999BD11D4370BDA70F62B8C9F4" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_WriteOffOfAllowancesForUncollectibleAmounts" xlink:label="loc_lpla_WriteOffOfAllowancesForUncollectibleAmounts_AE7192F9C266B6EE53A7202D6BBAFFA2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_73283E79CD491686AD47B1AD906AFBC9" xlink:to="loc_lpla_WriteOffOfAllowancesForUncollectibleAmounts_AE7192F9C266B6EE53A7202D6BBAFFA2" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_FreeCreditBalancesHeld" xlink:label="loc_lpla_FreeCreditBalancesHeld_87D35ED4F546859C5483A70CA1F24982" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_737472C48F7413A51D075815579B56BA" xlink:to="loc_lpla_FreeCreditBalancesHeld_87D35ED4F546859C5483A70CA1F24982" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesReceivablesFromOthersDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ValuationAllowanceLineItems" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_9031511331E738C544A75887049E6F5A" xlink:type="locator" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ScheduleForUncollectibleAmountsDueFromOthersTable" xlink:label="loc_lpla_ScheduleForUncollectibleAmountsDueFromOthersTable_53B69ACBCCFC54B219F0583986007B0D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_9031511331E738C544A75887049E6F5A" xlink:to="loc_lpla_ScheduleForUncollectibleAmountsDueFromOthersTable_53B69ACBCCFC54B219F0583986007B0D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesAxis" xlink:label="loc_lpla_ReceivablesAxis_F0DE5BEC5467FDC91466B1890139DFF7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_ScheduleForUncollectibleAmountsDueFromOthersTable_53B69ACBCCFC54B219F0583986007B0D" xlink:to="loc_lpla_ReceivablesAxis_F0DE5BEC5467FDC91466B1890139DFF7" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesDomain" xlink:label="loc_lpla_ReceivablesDomain_B644D95248293CBC9701B18901393295_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_ReceivablesAxis_F0DE5BEC5467FDC91466B1890139DFF7" xlink:to="loc_lpla_ReceivablesDomain_B644D95248293CBC9701B18901393295_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesDomain" xlink:label="loc_lpla_ReceivablesDomain_B644D95248293CBC9701B18901393295" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_ReceivablesAxis_F0DE5BEC5467FDC91466B1890139DFF7" xlink:to="loc_lpla_ReceivablesDomain_B644D95248293CBC9701B18901393295" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_ReceivablesFromOthersMember" xlink:label="loc_lpla_ReceivablesFromOthersMember_3F748AA0E9055E73DAFDB189DAD0BE48" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_ReceivablesDomain_B644D95248293CBC9701B18901393295" xlink:to="loc_lpla_ReceivablesFromOthersMember_3F748AA0E9055E73DAFDB189DAD0BE48" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_380D180DFEC592EC87D4202D6C75D28B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_9031511331E738C544A75887049E6F5A" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_380D180DFEC592EC87D4202D6C75D28B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent_72542B274843262D5A80B19A20476A4E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_380D180DFEC592EC87D4202D6C75D28B" xlink:to="loc_us-gaap_AllowanceForDoubtfulOtherReceivablesCurrent_72542B274843262D5A80B19A20476A4E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_0857DD9C705752B59C3B202D6C758E7C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_380D180DFEC592EC87D4202D6C75D28B" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_0857DD9C705752B59C3B202D6C758E7C" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_WriteOffOfAllowancesForOtherReceivables" xlink:label="loc_lpla_WriteOffOfAllowancesForOtherReceivables_494E17096B378B251D79202D6C757BD7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_380D180DFEC592EC87D4202D6C75D28B" xlink:to="loc_lpla_WriteOffOfAllowancesForOtherReceivables_494E17096B378B251D79202D6C757BD7" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.lpl.com/role/SummaryOfSignificantAccountingPoliciesSecuritiesBorrowedAndLoanedDetails" xlink:type="extended">
    <loc xlink:href="lpla-20111231.xsd#lpla_SecuritiesBorrowedAndLoanedLineItems" xlink:label="loc_lpla_SecuritiesBorrowedAndLoanedLineItems_E0CBAE3FC6FDA8C57FFD3F5B2B25D9DC" xlink:type="locator" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SecuritiesBorrowedAndLoanedTable" xlink:label="loc_lpla_SecuritiesBorrowedAndLoanedTable_7586DC0D39073A924D393F4CD76C4FFF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedLineItems_E0CBAE3FC6FDA8C57FFD3F5B2B25D9DC" xlink:to="loc_lpla_SecuritiesBorrowedAndLoanedTable_7586DC0D39073A924D393F4CD76C4FFF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SecuritiesBorrowedAndLoanedAxis" xlink:label="loc_lpla_SecuritiesBorrowedAndLoanedAxis_E2BC76540237E646AA213F51061AE1DE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedTable_7586DC0D39073A924D393F4CD76C4FFF" xlink:to="loc_lpla_SecuritiesBorrowedAndLoanedAxis_E2BC76540237E646AA213F51061AE1DE" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SecuritiesBorrowedAndLoanedDomain" xlink:label="loc_lpla_SecuritiesBorrowedAndLoanedDomain_7966A0192E5EA85DB5A83F5284DACFE0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedAxis_E2BC76540237E646AA213F51061AE1DE" xlink:to="loc_lpla_SecuritiesBorrowedAndLoanedDomain_7966A0192E5EA85DB5A83F5284DACFE0_default" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SecuritiesBorrowedAndLoanedDomain" xlink:label="loc_lpla_SecuritiesBorrowedAndLoanedDomain_7966A0192E5EA85DB5A83F5284DACFE0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedAxis_E2BC76540237E646AA213F51061AE1DE" xlink:to="loc_lpla_SecuritiesBorrowedAndLoanedDomain_7966A0192E5EA85DB5A83F5284DACFE0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecuritiesBorrowed" xlink:label="loc_us-gaap_SecuritiesBorrowed_0881E4FF9010F9CB8C81075364769760" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedLineItems_E0CBAE3FC6FDA8C57FFD3F5B2B25D9DC" xlink:to="loc_us-gaap_SecuritiesBorrowed_0881E4FF9010F9CB8C81075364769760" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecuritiesLoaned" xlink:label="loc_us-gaap_SecuritiesLoaned_83E2E916A073406B1D540753649EA1EE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedLineItems_E0CBAE3FC6FDA8C57FFD3F5B2B25D9DC" xlink:to="loc_us-gaap_SecuritiesLoaned_83E2E916A073406B1D540753649EA1EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SecuritiesBorrowedFairValueDisclosure" xlink:label="loc_us-gaap_SecuritiesBorrowedFairValueDisclosure_2A09C75CD513F1929F013F4DB6CFC2C8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedLineItems_E0CBAE3FC6FDA8C57FFD3F5B2B25D9DC" xlink:to="loc_us-gaap_SecuritiesBorrowedFairValueDisclosure_2A09C75CD513F1929F013F4DB6CFC2C8" xlink:type="arc" />
    <loc xlink:href="lpla-20111231.xsd#lpla_SecuritiesLoanedFairValue" xlink:label="loc_lpla_SecuritiesLoanedFairValue_2AB34A22BE221448F2CB3F58BA739D12" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lpla_SecuritiesBorrowedAndLoanedLineItems_E0CBAE3FC6FDA8C57FFD3F5B2B25D9DC" xlink:to="loc_lpla_SecuritiesLoanedFairValue_2AB34A22BE221448F2CB3F58BA739D12" xlink:type="arc" />
  </definitionLink>
</linkbase>
</XBRL>
