<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c9ac0-598f-726c-b59f-d4168e5d2294,g:cc45f985-2c4b-4bef-9032-a54e56222327-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.agm.com/role/Cover" xlink:type="simple" xlink:href="apo-20260331.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019c9ac0-6a60-7358-85f3-10c656f759a0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_DocumentInformationTable_019c9ac0-6a60-7358-85f3-10c656f759a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6a60-7f86-a82b-7bea05d8f8e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019c9ac0-6a60-7358-85f3-10c656f759a0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6a60-7f86-a82b-7bea05d8f8e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6a60-7f86-a82b-7bea05d8f8e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6a60-7f86-a82b-7bea05d8f8e4" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6a60-7f86-a82b-7bea05d8f8e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6a60-77e2-8580-3a8cc0172e41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6a60-7f86-a82b-7bea05d8f8e4" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6a60-77e2-8580-3a8cc0172e41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c9ac0-6a60-7eaf-9a88-b584084349c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6a60-77e2-8580-3a8cc0172e41" xlink:to="loc_us-gaap_CommonStockMember_019c9ac0-6a60-7eaf-9a88-b584084349c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019c9ac0-6a60-71ce-8d9f-35978dd780db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6a60-77e2-8580-3a8cc0172e41" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019c9ac0-6a60-71ce-8d9f-35978dd780db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SubordinatedNotesMember_019c9ac0-6a60-78f5-b214-3a5df96f42f1" xlink:href="apo-20260331.xsd#apo_SubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6a60-77e2-8580-3a8cc0172e41" xlink:to="loc_apo_SubordinatedNotesMember_019c9ac0-6a60-78f5-b214-3a5df96f42f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019c9ac0-6a60-7c73-805f-46f52cb4827a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_DocumentType_019c9ac0-6a60-7c73-805f-46f52cb4827a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019c9ac0-6a60-7779-8c40-01684ef50268" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_DocumentQuarterlyReport_019c9ac0-6a60-7779-8c40-01684ef50268" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019c9ac0-6a60-775c-8f5a-700a959fa133" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_DocumentPeriodEndDate_019c9ac0-6a60-775c-8f5a-700a959fa133" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019c9ac0-6a60-7dec-97ec-2b285ebdd90a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_DocumentTransitionReport_019c9ac0-6a60-7dec-97ec-2b285ebdd90a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019c9ac0-6a60-7c76-8ea0-ebd55d0dcef0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityFileNumber_019c9ac0-6a60-7c76-8ea0-ebd55d0dcef0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019c9ac0-6a60-7679-b178-e9abf6eb365c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityRegistrantName_019c9ac0-6a60-7679-b178-e9abf6eb365c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019c9ac0-6a60-72f0-89f0-40d828d0deb0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019c9ac0-6a60-72f0-89f0-40d828d0deb0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019c9ac0-6a60-712f-934a-5027257f1732" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityTaxIdentificationNumber_019c9ac0-6a60-712f-934a-5027257f1732" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019c9ac0-6a60-79d5-b410-f22cce5bd7c5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityAddressAddressLine1_019c9ac0-6a60-79d5-b410-f22cce5bd7c5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019c9ac0-6a60-7583-9177-bf73a472786a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityAddressAddressLine2_019c9ac0-6a60-7583-9177-bf73a472786a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019c9ac0-6a60-7e67-a551-c538191f1b4b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityAddressCityOrTown_019c9ac0-6a60-7e67-a551-c538191f1b4b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019c9ac0-6a60-78d2-bd93-93c5f11f79ef" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityAddressStateOrProvince_019c9ac0-6a60-78d2-bd93-93c5f11f79ef" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019c9ac0-6a60-767d-b41e-3d0e0a923a60" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityAddressPostalZipCode_019c9ac0-6a60-767d-b41e-3d0e0a923a60" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019c9ac0-6a60-7699-b97a-7375fdfa3db0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_CityAreaCode_019c9ac0-6a60-7699-b97a-7375fdfa3db0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019c9ac0-6a60-76d7-8d5a-5c31e688a4bf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_LocalPhoneNumber_019c9ac0-6a60-76d7-8d5a-5c31e688a4bf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019c9ac0-6a60-7ad1-8539-21400222f84c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_Security12bTitle_019c9ac0-6a60-7ad1-8539-21400222f84c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019c9ac0-6a60-70e4-8457-9fb836b32bd6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_TradingSymbol_019c9ac0-6a60-70e4-8457-9fb836b32bd6" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019c9ac0-6a60-7a8f-a9c8-6114c2a9759b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_SecurityExchangeName_019c9ac0-6a60-7a8f-a9c8-6114c2a9759b" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019c9ac0-6a60-78c8-8767-4a3528af66ff" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityCurrentReportingStatus_019c9ac0-6a60-78c8-8767-4a3528af66ff" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019c9ac0-6a60-7b0b-95fd-998cb8daf654" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityInteractiveDataCurrent_019c9ac0-6a60-7b0b-95fd-998cb8daf654" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019c9ac0-6a60-7e5d-9cf1-75045f6318d2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityFilerCategory_019c9ac0-6a60-7e5d-9cf1-75045f6318d2" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019c9ac0-6a60-794b-b1de-f8341e3065f1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntitySmallBusiness_019c9ac0-6a60-794b-b1de-f8341e3065f1" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019c9ac0-6a60-70d1-9842-60eaf97191b3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityEmergingGrowthCompany_019c9ac0-6a60-70d1-9842-60eaf97191b3" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019c9ac0-6a60-7641-b3c5-f76a87aa2c42" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityShellCompany_019c9ac0-6a60-7641-b3c5-f76a87aa2c42" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019c9ac0-6a60-77ed-b6b2-e39cd99f2787" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019c9ac0-6a60-77ed-b6b2-e39cd99f2787" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019c9ac0-6a60-70e4-b784-76af64542d80" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_AmendmentFlag_019c9ac0-6a60-70e4-b784-76af64542d80" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019c9ac0-6a60-7449-8335-6d1dc2be84f8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_DocumentFiscalYearFocus_019c9ac0-6a60-7449-8335-6d1dc2be84f8" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019c9ac0-6a60-70fc-938c-0d0575a8a650" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019c9ac0-6a60-70fc-938c-0d0575a8a650" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019c9ac0-6a60-791a-bf4d-ef6a0c97a333" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_EntityCentralIndexKey_019c9ac0-6a60-791a-bf4d-ef6a0c97a333" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019cd351-2e51-7976-8453-2aa9afc62882" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c9ac0-6a60-7877-97e7-04e1b299caf6" xlink:to="loc_dei_CurrentFiscalYearEndDate_019cd351-2e51-7976-8453-2aa9afc62882" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFFINANCIALCONDITIONUNAUDITED" xlink:type="simple" xlink:href="apo-20260331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFFINANCIALCONDITIONUNAUDITED"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFFINANCIALCONDITIONUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c9ac0-6b16-708a-a9f6-b6f278cebd53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c9ac0-6b16-776b-b0c2-c472adbd9c86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-708a-a9f6-b6f278cebd53" xlink:to="loc_us-gaap_StatementTable_019c9ac0-6b16-776b-b0c2-c472adbd9c86" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7fbf-abce-512a5aee9a93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-776b-b0c2-c472adbd9c86" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7fbf-abce-512a5aee9a93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7fbf-abce-512a5aee9a93_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7fbf-abce-512a5aee9a93" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7fbf-abce-512a5aee9a93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7fac-a9fb-d75a2ad16fa3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7fbf-abce-512a5aee9a93" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7fac-a9fb-d75a2ad16fa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7424-b243-24a603c31808" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7fac-a9fb-d75a2ad16fa3" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7424-b243-24a603c31808" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-72e8-86fd-7086a2af1b64" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7fac-a9fb-d75a2ad16fa3" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-72e8-86fd-7086a2af1b64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-78ca-a5b5-30c3cedb48bb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-776b-b0c2-c472adbd9c86" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-78ca-a5b5-30c3cedb48bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-78ca-a5b5-30c3cedb48bb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-78ca-a5b5-30c3cedb48bb" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-78ca-a5b5-30c3cedb48bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7ffc-a6ed-02f6dd9d8387" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-78ca-a5b5-30c3cedb48bb" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7ffc-a6ed-02f6dd9d8387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019c9ac0-6b16-7c3b-b951-4c6a778ee04e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7ffc-a6ed-02f6dd9d8387" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019c9ac0-6b16-7c3b-b951-4c6a778ee04e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b16-7444-8aa4-666133437ded" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7ffc-a6ed-02f6dd9d8387" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b16-7444-8aa4-666133437ded" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7f9f-9ce6-fcd2c974983e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-776b-b0c2-c472adbd9c86" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7f9f-9ce6-fcd2c974983e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7f9f-9ce6-fcd2c974983e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7f9f-9ce6-fcd2c974983e" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7f9f-9ce6-fcd2c974983e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7734-8d0e-2ad04e4d5247" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7f9f-9ce6-fcd2c974983e" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7734-8d0e-2ad04e4d5247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-7356-8791-562af2eac982" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7734-8d0e-2ad04e4d5247" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-7356-8791-562af2eac982" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-717e-8180-d09c9f9e8ba8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7734-8d0e-2ad04e4d5247" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-717e-8180-d09c9f9e8ba8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-708a-a9f6-b6f278cebd53" xlink:to="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c9ac0-6b16-7cd1-bc0f-5816b28ed1ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c9ac0-6b16-7cd1-bc0f-5816b28ed1ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019c9ac0-6b16-7d94-a35c-f61f30cd5418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019c9ac0-6b16-7d94-a35c-f61f30cd5418" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019c9ac0-6b16-7e35-8152-3823c7f9b802" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_Investments_019c9ac0-6b16-7e35-8152-3823c7f9b802" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_019c9ac0-6b16-7510-91be-7950e8c383bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_019c9ac0-6b16-7510-91be-7950e8c383bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019c9ac0-6b16-7d0c-9c5b-4482551d410a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_OtherAssets_019c9ac0-6b16-7d0c-9c5b-4482551d410a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c9ac0-6b16-796c-ba28-a68eb5d4d178" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_Goodwill_019c9ac0-6b16-796c-ba28-a68eb5d4d178" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019c9ac0-6b16-7b5a-a9fe-3db510b4e43e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019c9ac0-6b16-7b5a-a9fe-3db510b4e43e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet_019c9ac0-6b16-7ef4-adfa-108999dc40b3" xlink:href="apo-20260331.xsd#apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet_019c9ac0-6b16-7ef4-adfa-108999dc40b3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c9ac0-6b16-72b8-ac88-ab4511b67120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c9ac0-6b16-7cff-a783-fdb63b9d9120" xlink:to="loc_us-gaap_Assets_019c9ac0-6b16-72b8-ac88-ab4511b67120" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c9ac0-6b16-7f8a-9f59-e42cad1adb2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-708a-a9f6-b6f278cebd53" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c9ac0-6b16-7f8a-9f59-e42cad1adb2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c9ac0-6b16-7f8a-9f59-e42cad1adb2f" xlink:to="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019c9ac0-6b16-7f1e-916c-3b77c25cc135" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019c9ac0-6b16-7f1e-916c-3b77c25cc135" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_019c9ac0-6b16-7fed-af22-325d90cabce1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_019c9ac0-6b16-7fed-af22-325d90cabce1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c9ac0-6b16-770f-b5e3-87a768700eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_LongTermDebt_019c9ac0-6b16-770f-b5e3-87a768700eb8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019c9ac0-6b16-7b42-a8ee-33bd77673b16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019c9ac0-6b16-7b42-a8ee-33bd77673b16" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019c9ac0-6b16-75d0-97f1-5580f228e605" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019c9ac0-6b16-75d0-97f1-5580f228e605" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019c9ac0-6b16-7ce0-9c23-d8cfd31d3f00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019c9ac0-6b16-7ce0-9c23-d8cfd31d3f00" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PayablesForCollateralOnDerivativesAndSecuritiesToRepurchase_019c9ac0-6b16-7477-a6ff-06ca62dae4df" xlink:href="apo-20260331.xsd#apo_PayablesForCollateralOnDerivativesAndSecuritiesToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_apo_PayablesForCollateralOnDerivativesAndSecuritiesToRepurchase_019c9ac0-6b16-7477-a6ff-06ca62dae4df" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019c9ac0-6b16-7f47-a477-d6a081a840e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_OtherLiabilities_019c9ac0-6b16-7f47-a477-d6a081a840e8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019c9ac0-6b16-7b28-bcfe-3d9bb4df71e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019c9ac0-6b16-7afc-b18e-23feecdd7731" xlink:to="loc_us-gaap_Liabilities_019c9ac0-6b16-7b28-bcfe-3d9bb4df71e5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019c9ac0-6b16-752c-8076-27322550d106" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c9ac0-6b16-7f8a-9f59-e42cad1adb2f" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019c9ac0-6b16-752c-8076-27322550d106" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmountAbstract_019c9ac0-6b16-7d86-b018-2c1e53474680" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmountAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c9ac0-6b16-7f8a-9f59-e42cad1adb2f" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmountAbstract_019c9ac0-6b16-7d86-b018-2c1e53474680" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019c9ac0-6b16-7a71-b348-e2464464ab81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmountAbstract_019c9ac0-6b16-7d86-b018-2c1e53474680" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019c9ac0-6b16-7a71-b348-e2464464ab81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c9ac0-6b16-7f8a-9f59-e42cad1adb2f" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019c9ac0-6b16-7327-93ea-093a227ed4e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_PreferredStockValue_019c9ac0-6b16-7327-93ea-093a227ed4e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019c9ac0-6b16-78eb-ba36-3996cb57fd4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_CommonStockValue_019c9ac0-6b16-78eb-ba36-3996cb57fd4d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019c9ac0-6b16-7bfb-aaec-3c48b33c4522" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019c9ac0-6b16-7bfb-aaec-3c48b33c4522" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c9ac0-6b16-7764-b69a-5518f4f044e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c9ac0-6b16-7764-b69a-5518f4f044e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019c9ac0-6b16-73a3-ad02-36ee265a4e98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019c9ac0-6b16-73a3-ad02-36ee265a4e98" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c9ac0-6b16-7e19-89a4-97f6d86cdf22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_StockholdersEquity_019c9ac0-6b16-7e19-89a4-97f6d86cdf22" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019c9ac0-6b16-7146-a5fe-32eb49c3f370" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_MinorityInterest_019c9ac0-6b16-7146-a5fe-32eb49c3f370" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6b16-72b8-86e8-3c61e8137362" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c9ac0-6b16-7d2d-9ce4-d173529a1959" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6b16-72b8-86e8-3c61e8137362" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019c9ac0-6b16-7576-8355-ebe204a6a7c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c9ac0-6b16-7f8a-9f59-e42cad1adb2f" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019c9ac0-6b16-7576-8355-ebe204a6a7c4" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUNAUDITED" xlink:type="simple" xlink:href="apo-20260331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUNAUDITED"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c9ac0-6b16-770e-978f-d7517ad57762" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_StatementTable_019c9ac0-6b16-770e-978f-d7517ad57762" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-70d6-a591-50c1fe58813c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-770e-978f-d7517ad57762" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-70d6-a591-50c1fe58813c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-70d6-a591-50c1fe58813c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-70d6-a591-50c1fe58813c" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-70d6-a591-50c1fe58813c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-74e3-a1ea-5d52842fa729" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-70d6-a591-50c1fe58813c" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-74e3-a1ea-5d52842fa729" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7937-ad56-e599c51db3ef" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-74e3-a1ea-5d52842fa729" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7937-ad56-e599c51db3ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-7cd4-8cf7-ab1b3a161bba" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-74e3-a1ea-5d52842fa729" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-7cd4-8cf7-ab1b3a161bba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6b16-7bd1-bb84-c9a0a7a2fbf5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-770e-978f-d7517ad57762" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6b16-7bd1-bb84-c9a0a7a2fbf5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6b16-7bd1-bb84-c9a0a7a2fbf5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6b16-7bd1-bb84-c9a0a7a2fbf5" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6b16-7bd1-bb84-c9a0a7a2fbf5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6b16-7ead-a6a5-5541dd0204df" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6b16-7bd1-bb84-c9a0a7a2fbf5" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6b16-7ead-a6a5-5541dd0204df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetManagement1Member_019c9ac0-6b16-7070-b896-b868a0e2bc27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetManagement1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6b16-7ead-a6a5-5541dd0204df" xlink:to="loc_us-gaap_AssetManagement1Member_019c9ac0-6b16-7070-b896-b868a0e2bc27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAdviceMember_019c9ac0-6b16-7109-b87a-71fe9c7c42a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentAdviceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6b16-7ead-a6a5-5541dd0204df" xlink:to="loc_us-gaap_InvestmentAdviceMember_019c9ac0-6b16-7109-b87a-71fe9c7c42a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementServiceIncentiveMember_019c9ac0-6b16-7b61-a4ea-c1fea7478a05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ManagementServiceIncentiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6b16-7ead-a6a5-5541dd0204df" xlink:to="loc_us-gaap_ManagementServiceIncentiveMember_019c9ac0-6b16-7b61-a4ea-c1fea7478a05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c9ac0-6b16-799e-834a-ee81f2ae294f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c9ac0-6b16-799e-834a-ee81f2ae294f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019c9ac0-6b16-7ab5-9796-6afb4229ca7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_us-gaap_NetInvestmentIncome_019c9ac0-6b16-7ab5-9796-6afb4229ca7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PropertyManagementDevelopmentAndOtherFees_019c9ac0-6b16-7d18-ae6b-7833b5745074" xlink:href="apo-20260331.xsd#apo_PropertyManagementDevelopmentAndOtherFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_apo_PropertyManagementDevelopmentAndOtherFees_019c9ac0-6b16-7d18-ae6b-7833b5745074" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019c9ac0-6b16-751d-9c4e-1e8428b0394a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_us-gaap_PremiumsEarnedNet_019c9ac0-6b16-751d-9c4e-1e8428b0394a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissionsAndFees_019c9ac0-6b16-73f3-bf29-4f87b13be94f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceCommissionsAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_us-gaap_InsuranceCommissionsAndFees_019c9ac0-6b16-73f3-bf29-4f87b13be94f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019c9ac0-6b16-7c49-8c4f-0a24daeeff76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_us-gaap_GainLossOnInvestments_019c9ac0-6b16-7c49-8c4f-0a24daeeff76" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NetInvestmentIncomeAndGainLossOnInvestments_019c9ac0-6b16-70d0-8c8e-af3889f5d2b2" xlink:href="apo-20260331.xsd#apo_NetInvestmentIncomeAndGainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_apo_NetInvestmentIncomeAndGainLossOnInvestments_019c9ac0-6b16-70d0-8c8e-af3889f5d2b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_019c9ac0-6b16-7004-b2b2-9cff9b540eab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_us-gaap_OtherIncome_019c9ac0-6b16-7004-b2b2-9cff9b540eab" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c9ac0-6b16-7510-8ab1-1b0e0eb22663" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019c9ac0-6b16-7f16-90a1-3c80cd6916c9" xlink:to="loc_us-gaap_Revenues_019c9ac0-6b16-7510-8ab1-1b0e0eb22663" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019c9ac0-6b16-7ccb-b323-57f0036ed7be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019c9ac0-6b16-7ccb-b323-57f0036ed7be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019c9ac0-6b16-7471-89b4-92849a8d5e53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_InterestExpenseOperating_019c9ac0-6b16-7471-89b4-92849a8d5e53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019c9ac0-6b16-7e0e-8888-452eafbfbdf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019c9ac0-6b16-7e0e-8888-452eafbfbdf6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestSensitiveContractBenefitsExpense_019c9ac0-6b16-70b8-a704-d9efe5bed99e" xlink:href="apo-20260331.xsd#apo_InterestSensitiveContractBenefitsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_apo_InterestSensitiveContractBenefitsExpense_019c9ac0-6b16-70b8-a704-d9efe5bed99e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019c9ac0-6b16-7660-9eaa-639b9b0c5425" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019c9ac0-6b16-7660-9eaa-639b9b0c5425" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_019c9ac0-6b16-70fa-acc4-0647821dd37d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitChangeInFairValueGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_019c9ac0-6b16-70fa-acc4-0647821dd37d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1_019c9ac0-6b16-7050-ab80-1456300aa9d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1_019c9ac0-6b16-7050-ab80-1456300aa9d6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_019c9ac0-6b16-7bcc-80da-42468102a472" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_019c9ac0-6b16-7bcc-80da-42468102a472" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019c9ac0-6b16-70a0-9198-6e806c9c53fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c9ac0-6b16-7def-aa9b-7941fe702dff" xlink:to="loc_us-gaap_OperatingExpenses_019c9ac0-6b16-70a0-9198-6e806c9c53fb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019c9ac0-6b16-7b20-955d-89f98390a09d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019c9ac0-6b16-7b20-955d-89f98390a09d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_GainLossOnInvestmentsExcludingVIE_019c9ac0-6b16-76e3-a0af-781505ae85d7" xlink:href="apo-20260331.xsd#apo_GainLossOnInvestmentsExcludingVIE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019c9ac0-6b16-7b20-955d-89f98390a09d" xlink:to="loc_apo_GainLossOnInvestmentsExcludingVIE_019c9ac0-6b16-76e3-a0af-781505ae85d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_GainLossOnInvestmentsPrimaryBeneficiary_019c9ac0-6b16-7c07-9e50-ae18f1773097" xlink:href="apo-20260331.xsd#apo_GainLossOnInvestmentsPrimaryBeneficiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019c9ac0-6b16-7b20-955d-89f98390a09d" xlink:to="loc_apo_GainLossOnInvestmentsPrimaryBeneficiary_019c9ac0-6b16-7c07-9e50-ae18f1773097" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019c9ac0-6b16-7854-bd9b-56cc890d9ff1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019c9ac0-6b16-7b20-955d-89f98390a09d" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019c9ac0-6b16-7854-bd9b-56cc890d9ff1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019c9ac0-6b16-70b5-b897-2b2be6b12d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019c9ac0-6b16-7b20-955d-89f98390a09d" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019c9ac0-6b16-70b5-b897-2b2be6b12d9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c9ac0-6b16-7a28-a7bb-50cd4703b913" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c9ac0-6b16-7a28-a7bb-50cd4703b913" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019c9ac0-6b16-76dd-8e4d-fcfde0fcf67c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019c9ac0-6b16-76dd-8e4d-fcfde0fcf67c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019c9ac0-6b16-7433-8fea-a2cf76cc9dd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_ProfitLoss_019c9ac0-6b16-7433-8fea-a2cf76cc9dd3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019c9ac0-6b16-7ef5-b5fe-546a17a3537c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019c9ac0-6b16-7ef5-b5fe-546a17a3537c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c9ac0-6b16-7ac1-a538-c0d01d27dcb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_NetIncomeLoss_019c9ac0-6b16-7ac1-a538-c0d01d27dcb0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019c9ac0-6b16-7a5f-89b6-4a77b03e6cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019c9ac0-6b16-7a5f-89b6-4a77b03e6cb7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019c9ac0-6b16-7b93-935e-df6072c65280" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019c9ac0-6b16-7b93-935e-df6072c65280" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019c9ac0-6b16-79b1-80a9-7db2ac904f83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019c9ac0-6b16-79b1-80a9-7db2ac904f83" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_019c9ac0-6b16-7649-81b0-857365c3799d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_EarningsPerShareAbstract_019c9ac0-6b16-7649-81b0-857365c3799d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019c9ac0-6b16-7519-9a92-90b795c009d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019c9ac0-6b16-7649-81b0-857365c3799d" xlink:to="loc_us-gaap_EarningsPerShareBasic_019c9ac0-6b16-7519-9a92-90b795c009d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019c9ac0-6b16-7d91-8543-810cf0acee36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019c9ac0-6b16-7649-81b0-857365c3799d" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019c9ac0-6b16-7d91-8543-810cf0acee36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019c9ac0-6b16-78df-b6d6-8f98f4a47e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7efa-9f9a-d0ead0a89846" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019c9ac0-6b16-78df-b6d6-8f98f4a47e2f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c9ac0-6b16-718d-85fa-b2880189196d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019c9ac0-6b16-78df-b6d6-8f98f4a47e2f" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c9ac0-6b16-718d-85fa-b2880189196d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c9ac0-6b16-7428-8690-e8cfc5849e46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_019c9ac0-6b16-78df-b6d6-8f98f4a47e2f" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c9ac0-6b16-7428-8690-e8cfc5849e46" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYUNAUDITED" xlink:type="simple" xlink:href="apo-20260331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYUNAUDITED"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c9ac0-6b16-74ee-b71a-39b3d2dee8db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c9ac0-6b16-7a8f-bf6c-fe821ff39aad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-74ee-b71a-39b3d2dee8db" xlink:to="loc_us-gaap_StatementTable_019c9ac0-6b16-7a8f-bf6c-fe821ff39aad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6b16-7f3c-b2e8-278fb9882d7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-7a8f-bf6c-fe821ff39aad" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6b16-7f3c-b2e8-278fb9882d7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6b16-7f3c-b2e8-278fb9882d7b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6b16-7f3c-b2e8-278fb9882d7b" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6b16-7f3c-b2e8-278fb9882d7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6b16-71b1-9ecb-f531f12c9dc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6b16-7f3c-b2e8-278fb9882d7b" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6b16-71b1-9ecb-f531f12c9dc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_019c9ac0-6b16-7232-84a4-b1bfd530a0a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c9ac0-6b16-71b1-9ecb-f531f12c9dc1" xlink:to="loc_us-gaap_ParentMember_019c9ac0-6b16-7232-84a4-b1bfd530a0a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c9ac0-6b16-756d-9231-58e5d293aee6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019c9ac0-6b16-7232-84a4-b1bfd530a0a7" xlink:to="loc_us-gaap_CommonStockMember_019c9ac0-6b16-756d-9231-58e5d293aee6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019c9ac0-6b16-79e9-a97b-c01f4696f332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019c9ac0-6b16-7232-84a4-b1bfd530a0a7" xlink:to="loc_us-gaap_PreferredStockMember_019c9ac0-6b16-79e9-a97b-c01f4696f332" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019c9ac0-6b16-7ba0-9096-71e2cb332ea9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019c9ac0-6b16-7232-84a4-b1bfd530a0a7" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019c9ac0-6b16-7ba0-9096-71e2cb332ea9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019c9ac0-6b16-7559-b322-da8c75b9090e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019c9ac0-6b16-7232-84a4-b1bfd530a0a7" xlink:to="loc_us-gaap_RetainedEarningsMember_019c9ac0-6b16-7559-b322-da8c75b9090e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6b16-7b92-ae1a-2a65dd6fd13b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019c9ac0-6b16-7232-84a4-b1bfd530a0a7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6b16-7b92-ae1a-2a65dd6fd13b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019c9ac0-6b16-791b-8595-181962a57ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c9ac0-6b16-71b1-9ecb-f531f12c9dc1" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019c9ac0-6b16-791b-8595-181962a57ff8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-74ee-b71a-39b3d2dee8db" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c9ac0-6b16-77fd-ba71-7565f3cbbbca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019c9ac0-6b16-77fd-ba71-7565f3cbbbca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6b16-70f6-a6d8-14cdb4a5a20c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6b16-70f6-a6d8-14cdb4a5a20c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestExcludingRedeemableNoncontrollingInterest_019cd653-01c0-70cc-8fe0-87b12cb08a7c" xlink:href="apo-20260331.xsd#apo_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestExcludingRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_apo_NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestExcludingRedeemableNoncontrollingInterest_019cd653-01c0-70cc-8fe0-87b12cb08a7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019cd653-01c0-7a42-978a-757eff85fe91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019cd653-01c0-7a42-978a-757eff85fe91" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cd653-01c0-7ca2-8d72-de9416b3aef4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cd653-01c0-7ca2-8d72-de9416b3aef4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019cd653-01c0-7500-871c-16c44cc2eb99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019cd653-01c0-7500-871c-16c44cc2eb99" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NoncontrollingInterestDecreaseFromDistributionsToNoncontrollingInterestHoldersAndDividends_019cd653-01c0-7a1f-a6f7-095eeed423d4" xlink:href="apo-20260331.xsd#apo_NoncontrollingInterestDecreaseFromDistributionsToNoncontrollingInterestHoldersAndDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_apo_NoncontrollingInterestDecreaseFromDistributionsToNoncontrollingInterestHoldersAndDividends_019cd653-01c0-7a1f-a6f7-095eeed423d4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SharesIssuedDuringPeriodSharesShareBasedPaymentArrangement_019cd653-01c0-7b6c-9b35-e18f15ce30c4" xlink:href="apo-20260331.xsd#apo_SharesIssuedDuringPeriodSharesShareBasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_apo_SharesIssuedDuringPeriodSharesShareBasedPaymentArrangement_019cd653-01c0-7b6c-9b35-e18f15ce30c4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SharesIssuedDuringPeriodValueShareBasedPaymentArrangement_019cd653-01c0-7cd1-ac6b-9cc737eff82d" xlink:href="apo-20260331.xsd#apo_SharesIssuedDuringPeriodValueShareBasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_apo_SharesIssuedDuringPeriodValueShareBasedPaymentArrangement_019cd653-01c0-7cd1-ac6b-9cc737eff82d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019cd653-01c0-7376-b36f-edcaeeae5c40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019cd653-01c0-7376-b36f-edcaeeae5c40" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_019cd653-01c0-70f6-b65c-1fb4aaed4171" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_019cd653-01c0-70f6-b65c-1fb4aaed4171" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NoncontrollingInterestIncreaseFromConsolidation_019cd656-96f7-7d25-aa78-f5e3277bf0dc" xlink:href="apo-20260331.xsd#apo_NoncontrollingInterestIncreaseFromConsolidation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_apo_NoncontrollingInterestIncreaseFromConsolidation_019cd656-96f7-7d25-aa78-f5e3277bf0dc" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_019cd656-96f8-7941-b6e4-a30a1b68f58f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_019cd656-96f8-7941-b6e4-a30a1b68f58f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019cd656-96f8-7202-a306-0ceb10b869c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019cd656-96f8-7202-a306-0ceb10b869c5" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AdjustmentToAdditionalPaidInCapitalAccretionOfRedeemableNoncontrollingInterests_019cd653-01c0-7115-b77f-a77dbd57ebee" xlink:href="apo-20260331.xsd#apo_AdjustmentToAdditionalPaidInCapitalAccretionOfRedeemableNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_apo_AdjustmentToAdditionalPaidInCapitalAccretionOfRedeemableNoncontrollingInterests_019cd653-01c0-7115-b77f-a77dbd57ebee" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_019cdbb1-af3c-7adc-89c3-5a1b88d569c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_019cdbb1-af3c-7adc-89c3-5a1b88d569c6" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_019cdbb1-2498-72b1-9218-17968fc173d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_019cdbb1-2498-72b1-9218-17968fc173d1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd653-01c0-760f-8ab7-610b04f786d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cd653-01c0-760f-8ab7-610b04f786d8" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019cd653-01c0-7162-922b-9c12e0c194ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019cd653-01c0-7162-922b-9c12e0c194ca" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NoncontrollingInterestOtherChangesInEquity_019cd653-01c0-7ff0-851b-dd76166e3e01" xlink:href="apo-20260331.xsd#apo_NoncontrollingInterestOtherChangesInEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c9ac0-6b16-7fce-ad7e-161f8caaab92" xlink:to="loc_apo_NoncontrollingInterestOtherChangesInEquity_019cd653-01c0-7ff0-851b-dd76166e3e01" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c9ac0-6b16-78d7-a75f-82e2cb4c763c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6b16-7d3e-9df0-1955b30485b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED" xlink:type="simple" xlink:href="apo-20260331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c9ac0-6b16-7562-a238-827803613338" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_StatementTable_019c9ac0-6b16-7562-a238-827803613338" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7e92-bcb9-705b9dcfc52c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-7562-a238-827803613338" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7e92-bcb9-705b9dcfc52c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7e92-bcb9-705b9dcfc52c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7e92-bcb9-705b9dcfc52c" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7e92-bcb9-705b9dcfc52c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7df8-bc74-6d56853fdabc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7e92-bcb9-705b9dcfc52c" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7df8-bc74-6d56853fdabc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-7c95-b6fd-5f09dad8ad05" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7df8-bc74-6d56853fdabc" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-7c95-b6fd-5f09dad8ad05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7fe9-b5e5-c173cfa2d5f7" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7df8-bc74-6d56853fdabc" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7fe9-b5e5-c173cfa2d5f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7894-8b5f-d49458b38fb4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c9ac0-6b16-7562-a238-827803613338" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7894-8b5f-d49458b38fb4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7894-8b5f-d49458b38fb4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7894-8b5f-d49458b38fb4" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7894-8b5f-d49458b38fb4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7f0a-8eeb-37d06e8c1502" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7894-8b5f-d49458b38fb4" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7f0a-8eeb-37d06e8c1502" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b16-76a3-bbea-90d05662d9cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7f0a-8eeb-37d06e8c1502" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b16-76a3-bbea-90d05662d9cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-72e8-9e13-b80b5ec316d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsolidatedEntityExcludingVieMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7f0a-8eeb-37d06e8c1502" xlink:to="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-72e8-9e13-b80b5ec316d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7c7c-af0a-f0adfeae534b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7c7c-af0a-f0adfeae534b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019c9ac0-6b16-7f1a-aac9-73af8754afca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7c7c-af0a-f0adfeae534b" xlink:to="loc_us-gaap_ProfitLoss_019c9ac0-6b16-7f1a-aac9-73af8754afca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7c7c-af0a-f0adfeae534b" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019c9ac0-6b16-78bf-a438-09f28f021eba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_us-gaap_ShareBasedCompensation_019c9ac0-6b16-78bf-a438-09f28f021eba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_019c9ac0-6b16-745e-8c5e-9443d8b38c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_us-gaap_InvestmentIncomeNet_019c9ac0-6b16-745e-8c5e-9443d8b38c4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_GainLossOnInvestmentsAndDerivatives_019c9ac0-6b16-790c-8724-64c7062c1d54" xlink:href="apo-20260331.xsd#apo_GainLossOnInvestmentsAndDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_apo_GainLossOnInvestmentsAndDerivatives_019c9ac0-6b16-790c-8724-64c7062c1d54" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019c9ac0-6b16-72bf-bc4c-08876aa2abd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019c9ac0-6b16-72bf-bc4c-08876aa2abd0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019c9ac0-6b16-7e95-b675-38da778d8c42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019c9ac0-6b16-7e95-b675-38da778d8c42" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyAcquisitionCostsDeferred_019c9ac0-6b16-7fbf-a64a-28d60258e882" xlink:href="apo-20260331.xsd#apo_PolicyAcquisitionCostsDeferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_apo_PolicyAcquisitionCostsDeferred_019c9ac0-6b16-7fbf-a64a-28d60258e882" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_019c9ac0-6b16-7d81-9c30-9a3fc62d2d45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_019c9ac0-6b16-7d81-9c30-9a3fc62d2d45" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_IncreaseDecreaseInConsolidationOperatingActivities_019c9ac0-6b16-7f97-b23c-1fa2b436a5cc" xlink:href="apo-20260331.xsd#apo_IncreaseDecreaseInConsolidationOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_apo_IncreaseDecreaseInConsolidationOperatingActivities_019c9ac0-6b16-7f97-b23c-1fa2b436a5cc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c9ac0-6b16-707d-a261-3a38912c563e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7b58-97f8-8afc802893bb" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c9ac0-6b16-707d-a261-3a38912c563e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTradingSecurities_019c9ac0-6b16-73b5-9a8a-b303b364316e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInTradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c9ac0-6b16-707d-a261-3a38912c563e" xlink:to="loc_us-gaap_IncreaseDecreaseInTradingSecurities_019c9ac0-6b16-73b5-9a8a-b303b364316e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_IncreaseDecreaseFromSaleOfInvestments_019c9ac0-6b16-751e-a6b7-1d48fa4bfeb0" xlink:href="apo-20260331.xsd#apo_IncreaseDecreaseFromSaleOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c9ac0-6b16-707d-a261-3a38912c563e" xlink:to="loc_apo_IncreaseDecreaseFromSaleOfInvestments_019c9ac0-6b16-751e-a6b7-1d48fa4bfeb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_IncreaseDecreaseInInterestSensitiveContractLiabilities_019c9ac0-6b16-76bc-b6b3-ee923aa1913b" xlink:href="apo-20260331.xsd#apo_IncreaseDecreaseInInterestSensitiveContractLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c9ac0-6b16-707d-a261-3a38912c563e" xlink:to="loc_apo_IncreaseDecreaseInInterestSensitiveContractLiabilities_019c9ac0-6b16-76bc-b6b3-ee923aa1913b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInsuranceLiabilities_019c9ac0-6b16-7c18-a337-0301f91d5d28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInsuranceLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c9ac0-6b16-707d-a261-3a38912c563e" xlink:to="loc_us-gaap_IncreaseDecreaseInInsuranceLiabilities_019c9ac0-6b16-7c18-a337-0301f91d5d28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_019c9ac0-6b16-7f52-a5a9-f5e08ca0077e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c9ac0-6b16-707d-a261-3a38912c563e" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_019c9ac0-6b16-7f52-a5a9-f5e08ca0077e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019c9ac0-6b16-720b-8e64-b0339e4a3517" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c9ac0-6b16-7c7c-af0a-f0adfeae534b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019c9ac0-6b16-720b-8e64-b0339e4a3517" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PaymentsToAcquireInvestmentsAndContributionsToEquityMethodInvestments_019c9ac0-6b16-777c-85f2-2a8d6e8e16c9" xlink:href="apo-20260331.xsd#apo_PaymentsToAcquireInvestmentsAndContributionsToEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_apo_PaymentsToAcquireInvestmentsAndContributionsToEquityMethodInvestments_019c9ac0-6b16-777c-85f2-2a8d6e8e16c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019c9ac0-6b16-7454-b9a1-3809484b3979" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019c9ac0-6b16-7454-b9a1-3809484b3979" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireNotesReceivable_019c9ac0-6b16-7653-b3c7-90d3cb2b9f40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_us-gaap_PaymentsToAcquireNotesReceivable_019c9ac0-6b16-7653-b3c7-90d3cb2b9f40" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PaymentsToAcquireInvestmentFunds_019c9ac0-6b16-7047-9117-7de7a77f6a51" xlink:href="apo-20260331.xsd#apo_PaymentsToAcquireInvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_apo_PaymentsToAcquireInvestmentFunds_019c9ac0-6b16-7047-9117-7de7a77f6a51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_019c9ac0-6b16-7748-9be2-b9eeb1d93709" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_019c9ac0-6b16-7748-9be2-b9eeb1d93709" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_019c9ac0-6b16-76df-8782-5dd7641dde54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForDerivativeInstrumentInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_019c9ac0-6b16-76df-8782-5dd7641dde54" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ProceedsFromSalesMaturitiesAndRepaymentsOfInvestmentsAndDistributionsFromEquityMethodInvestments_019c9ac0-6b16-79ef-8f62-c5de12a6b573" xlink:href="apo-20260331.xsd#apo_ProceedsFromSalesMaturitiesAndRepaymentsOfInvestmentsAndDistributionsFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_apo_ProceedsFromSalesMaturitiesAndRepaymentsOfInvestmentsAndDistributionsFromEquityMethodInvestments_019c9ac0-6b16-79ef-8f62-c5de12a6b573" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019c9ac0-6b16-7f3b-83e2-2759862ecc1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019c9ac0-6b16-7f3b-83e2-2759862ecc1c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019c9ac0-6b16-74f3-845b-8602290d8335" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c9ac0-6b16-7b22-84aa-fc3a28b2bf41" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019c9ac0-6b16-74f3-845b-8602290d8335" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019c9ac0-6b16-7053-8ef2-85c2b158ca29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019c9ac0-6b16-7053-8ef2-85c2b158ca29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019c9ac0-6b16-7191-a461-e367ce2fe228" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019c9ac0-6b16-7191-a461-e367ce2fe228" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c9ac0-6b16-7232-aad9-4a234d6832df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c9ac0-6b16-7232-aad9-4a234d6832df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_019c9ac0-6b16-7e7b-8ace-0bf9f8bff2f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_019c9ac0-6b16-7e7b-8ace-0bf9f8bff2f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019c9ac0-6b16-7d47-aac0-9759c235c669" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019c9ac0-6b16-7d47-aac0-9759c235c669" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_019c9ac0-6b16-70e3-bcb8-996b66c88922" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_019c9ac0-6b16-70e3-bcb8-996b66c88922" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_019c9ac0-6b16-7616-ab75-36c355d1e665" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_019c9ac0-6b16-7616-ab75-36c355d1e665" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificates_019c9ac0-6b16-7ebc-a199-31c1686336ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificates_019c9ac0-6b16-7ebc-a199-31c1686336ae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates_019c9ac0-6b16-746f-8da1-f802aa12169f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates_019c9ac0-6b16-746f-8da1-f802aa12169f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities_019c9ac0-6b16-7579-8e63-0b6251ee68c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities_019c9ac0-6b16-7579-8e63-0b6251ee68c9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019c9ac0-6b16-7970-ac5d-844ada3a82e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019c9ac0-6b16-7970-ac5d-844ada3a82e3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019c9ac0-6b16-7a10-839f-720429a477a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c9ac0-6b16-75d8-9b65-2b53da3af4a7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019c9ac0-6b16-7a10-839f-720429a477a0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c9ac0-6b16-7cea-979d-23ea864ddb97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c9ac0-6b16-7cea-979d-23ea864ddb97" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019c9ac0-6b16-7f1d-9c64-fabc33606cfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019c9ac0-6b16-7f1d-9c64-fabc33606cfa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c9ac0-6b16-74ee-aa18-4f7a731cbeac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c9ac0-6b16-74ee-aa18-4f7a731cbeac" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c9ac0-6b16-7863-84ef-587cbef43e81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c9ac0-6b16-7a75-8a65-24c255280b48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c9ac0-6b16-7a5a-b245-b829854c2a5e" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c9ac0-6b16-7a75-8a65-24c255280b48" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_019de1d8-c097-7fb7-84d1-ef9b14e562fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c9ac0-6b16-7a75-8a65-24c255280b48" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_019de1d8-c097-7fb7-84d1-ef9b14e562fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019c9ac0-6b16-71b7-bcce-24adaf0f1df3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c9ac0-6b16-7a75-8a65-24c255280b48" xlink:to="loc_us-gaap_InterestPaidNet_019c9ac0-6b16-71b7-bcce-24adaf0f1df3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c9ac0-6b16-7a75-8a65-24c255280b48" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NonCashCapitalIncreasesRelatedToShareBasedCompensation_019c9ac0-6b16-7382-887f-382376c1d4f1" xlink:href="apo-20260331.xsd#apo_NonCashCapitalIncreasesRelatedToShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:to="loc_apo_NonCashCapitalIncreasesRelatedToShareBasedCompensation_019c9ac0-6b16-7382-887f-382376c1d4f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NoncashIssuanceOfWarrants_019c9ac0-6b16-7688-a3ac-3f3523c3861e" xlink:href="apo-20260331.xsd#apo_NoncashIssuanceOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:to="loc_apo_NoncashIssuanceOfWarrants_019c9ac0-6b16-7688-a3ac-3f3523c3861e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NonCashIssuanceOfRestrictedShares_019c9ac0-6b16-7b70-bf76-f32681dcee83" xlink:href="apo-20260331.xsd#apo_NonCashIssuanceOfRestrictedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:to="loc_apo_NonCashIssuanceOfRestrictedShares_019c9ac0-6b16-7b70-bf76-f32681dcee83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NonCashIssuanceOfCommonStockToDonorAdviseFund_019c9ac0-6b16-75c8-bf89-e9cacaf53cde" xlink:href="apo-20260331.xsd#apo_NonCashIssuanceOfCommonStockToDonorAdviseFund"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:to="loc_apo_NonCashIssuanceOfCommonStockToDonorAdviseFund_019c9ac0-6b16-75c8-bf89-e9cacaf53cde" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DepositsOnInvestmentPoliciesAndContracts_019c9ac0-6b16-7476-9a92-166bb669f709" xlink:href="apo-20260331.xsd#apo_DepositsOnInvestmentPoliciesAndContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:to="loc_apo_DepositsOnInvestmentPoliciesAndContracts_019c9ac0-6b16-7476-9a92-166bb669f709" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_WithdrawalsOnInvestmentPoliciesAndContracts_019c9ac0-6b16-7c74-84e1-6e11d6a59bc0" xlink:href="apo-20260331.xsd#apo_WithdrawalsOnInvestmentPoliciesAndContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c9ac0-6b16-78d4-bdd2-3e8de5e54b7b" xlink:to="loc_apo_WithdrawalsOnInvestmentPoliciesAndContracts_019c9ac0-6b16-7c74-84e1-6e11d6a59bc0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c9ac0-6b16-7ace-94fb-0548210ddc52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c9ac0-6b16-7a75-8a65-24c255280b48" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c9ac0-6b16-7ace-94fb-0548210ddc52" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c9ac0-6b16-7944-a72b-4b84df0c1ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c9ac0-6b16-7ace-94fb-0548210ddc52" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c9ac0-6b16-7944-a72b-4b84df0c1ad0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019c9ac0-6b16-7d7a-9626-d089b61442ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c9ac0-6b16-7ace-94fb-0548210ddc52" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019c9ac0-6b16-7d7a-9626-d089b61442ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c9ac0-6b16-78c3-9b0d-c047dd752330" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/BusinessCombinationNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#BusinessCombinationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/BusinessCombinationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-77ca-85ee-a9a958509b31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-7fe8-8335-c2abf4612f00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-77ca-85ee-a9a958509b31" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-7fe8-8335-c2abf4612f00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7520-8280-912b690d1fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-7fe8-8335-c2abf4612f00" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7520-8280-912b690d1fd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7520-8280-912b690d1fd4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7520-8280-912b690d1fd4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7520-8280-912b690d1fd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-79a7-8fdd-57775ea86548" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7520-8280-912b690d1fd4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-79a7-8fdd-57775ea86548" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-7bd8-8e6e-5b3fb4cc219d" xlink:href="apo-20260331.xsd#apo_BridgeInvestmentGroupHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-79a7-8fdd-57775ea86548" xlink:to="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-7bd8-8e6e-5b3fb4cc219d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-726e-bd91-44f8a780288c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-7fe8-8335-c2abf4612f00" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-726e-bd91-44f8a780288c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-726e-bd91-44f8a780288c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-726e-bd91-44f8a780288c" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-726e-bd91-44f8a780288c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-7cd8-9111-0596601d5a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-726e-bd91-44f8a780288c" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-7cd8-9111-0596601d5a3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_CommonClassAAndClassACommonUnitMember_019c9ac0-6b16-7aa5-a3ba-ca0267496393" xlink:href="apo-20260331.xsd#apo_CommonClassAAndClassACommonUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-7cd8-9111-0596601d5a3f" xlink:to="loc_apo_CommonClassAAndClassACommonUnitMember_019c9ac0-6b16-7aa5-a3ba-ca0267496393" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c9ac0-6b16-7e4d-bf9c-b43b933fc1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-7cd8-9111-0596601d5a3f" xlink:to="loc_us-gaap_CommonClassBMember_019c9ac0-6b16-7e4d-bf9c-b43b933fc1a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationExchangeRatio_019c9ac0-6b16-7c26-ac9d-0eb94c5db07b" xlink:href="apo-20260331.xsd#apo_BusinessCombinationExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-77ca-85ee-a9a958509b31" xlink:to="loc_apo_BusinessCombinationExchangeRatio_019c9ac0-6b16-7c26-ac9d-0eb94c5db07b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c9ac0-6b16-7ab9-833a-977c6011ffd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-77ca-85ee-a9a958509b31" xlink:to="loc_us-gaap_Goodwill_019c9ac0-6b16-7ab9-833a-977c6011ffd9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/BusinessCombinationScheduleofPurchasePriceDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#BusinessCombinationScheduleofPurchasePriceDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/BusinessCombinationScheduleofPurchasePriceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-72e5-a93b-8bb7d97b31a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-72e5-a93b-8bb7d97b31a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7b7f-af6e-ab7658c0f59b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-72e5-a93b-8bb7d97b31a7" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7b7f-af6e-ab7658c0f59b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7b7f-af6e-ab7658c0f59b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7b7f-af6e-ab7658c0f59b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7b7f-af6e-ab7658c0f59b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-70e6-ac9b-adac5f5ea1a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7b7f-af6e-ab7658c0f59b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-70e6-ac9b-adac5f5ea1a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-7ea4-b503-0551c6378c41" xlink:href="apo-20260331.xsd#apo_BridgeInvestmentGroupHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-70e6-ac9b-adac5f5ea1a1" xlink:to="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-7ea4-b503-0551c6378c41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-7d29-8e4b-2a88af517d4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-72e5-a93b-8bb7d97b31a7" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-7d29-8e4b-2a88af517d4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-7d29-8e4b-2a88af517d4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-7d29-8e4b-2a88af517d4f" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-7d29-8e4b-2a88af517d4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-70e5-a9cd-c38069fcbacb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6b16-7d29-8e4b-2a88af517d4f" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-70e5-a9cd-c38069fcbacb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c9ac0-6b16-71a4-ad4a-f16d0e02c7b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-70e5-a9cd-c38069fcbacb" xlink:to="loc_us-gaap_CommonClassAMember_019c9ac0-6b16-71a4-ad4a-f16d0e02c7b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c9ac0-6b16-77f1-a1a6-8e2b7a854df6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-70e5-a9cd-c38069fcbacb" xlink:to="loc_us-gaap_CommonClassBMember_019c9ac0-6b16-77f1-a1a6-8e2b7a854df6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ClassACommonUnitMember_019c9ac0-6b16-7ba5-8796-90aa0212a90f" xlink:href="apo-20260331.xsd#apo_ClassACommonUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-70e5-a9cd-c38069fcbacb" xlink:to="loc_apo_ClassACommonUnitMember_019c9ac0-6b16-7ba5-8796-90aa0212a90f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_CommonClassAAndClassACommonUnitMember_019c9ac0-6b16-7a75-8677-679e506e3a94" xlink:href="apo-20260331.xsd#apo_CommonClassAAndClassACommonUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6b16-70e5-a9cd-c38069fcbacb" xlink:to="loc_apo_CommonClassAAndClassACommonUnitMember_019c9ac0-6b16-7a75-8677-679e506e3a94" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessAcquisitionNumberOfCommonStockSharesAcquired_019c9ac0-6b16-7bf4-8ea6-d58d581ffb85" xlink:href="apo-20260331.xsd#apo_BusinessAcquisitionNumberOfCommonStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_apo_BusinessAcquisitionNumberOfCommonStockSharesAcquired_019c9ac0-6b16-7bf4-8ea6-d58d581ffb85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationExchangeRatio_019c9ac0-6b16-79c3-95b9-047a5d2d0bde" xlink:href="apo-20260331.xsd#apo_BusinessCombinationExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_apo_BusinessCombinationExchangeRatio_019c9ac0-6b16-79c3-95b9-047a5d2d0bde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019c9ac0-6b16-7604-b53f-7791c2a26b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019c9ac0-6b16-7604-b53f-7791c2a26b5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_019c9ac0-6b16-70c7-a3be-193f75143685" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_019c9ac0-6b16-70c7-a3be-193f75143685" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019c9ac0-6b16-7570-8b8c-6a13ac8e1614" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019c9ac0-6b16-7570-8b8c-6a13ac8e1614" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationShareBasedCompensationAssumed_019c9ac0-6b16-7751-9faf-e6681e6ea099" xlink:href="apo-20260331.xsd#apo_BusinessCombinationShareBasedCompensationAssumed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_apo_BusinessCombinationShareBasedCompensationAssumed_019c9ac0-6b16-7751-9faf-e6681e6ea099" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationAcquisitionNonControllingInterestsPurchaseConsideration_019c9ac0-6b16-7623-917c-e78d2af7a8e9" xlink:href="apo-20260331.xsd#apo_BusinessCombinationAcquisitionNonControllingInterestsPurchaseConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_apo_BusinessCombinationAcquisitionNonControllingInterestsPurchaseConsideration_019c9ac0-6b16-7623-917c-e78d2af7a8e9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c9ac0-6b16-790b-954b-75fea7989b01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c9ac0-6b16-790b-954b-75fea7989b01" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019c9ac0-6b16-7e16-ba77-c54124cfe891" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019c9ac0-6b16-7e16-ba77-c54124cfe891" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationConsiderationTransferredEquity_019c9ac0-6b16-754f-ba88-f2dfea64ef1a" xlink:href="apo-20260331.xsd#apo_BusinessCombinationConsiderationTransferredEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_apo_BusinessCombinationConsiderationTransferredEquity_019c9ac0-6b16-754f-ba88-f2dfea64ef1a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationPreShareBasedCompensationExpense_019c9ac0-6b16-79cc-ad2b-bf6bd1adca99" xlink:href="apo-20260331.xsd#apo_BusinessCombinationPreShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_apo_BusinessCombinationPreShareBasedCompensationExpense_019c9ac0-6b16-79cc-ad2b-bf6bd1adca99" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationPostShareBasedCompensationExpense_019c9ac0-6b16-73ed-81d8-ca739dff6541" xlink:href="apo-20260331.xsd#apo_BusinessCombinationPostShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7551-bb6b-c4df0e7c5395" xlink:to="loc_apo_BusinessCombinationPostShareBasedCompensationExpense_019c9ac0-6b16-73ed-81d8-ca739dff6541" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/BusinessCombinationScheduleofFairValueAmountsRecognizedforAssetsAcquiredandLiabilitiesAssumedandResultingGoodwillDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#BusinessCombinationScheduleofFairValueAmountsRecognizedforAssetsAcquiredandLiabilitiesAssumedandResultingGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/BusinessCombinationScheduleofFairValueAmountsRecognizedforAssetsAcquiredandLiabilitiesAssumedandResultingGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-734a-a845-3599c57b8e7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-734a-a845-3599c57b8e7e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-711b-8b5e-7cbd6a2d1ba4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-734a-a845-3599c57b8e7e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-711b-8b5e-7cbd6a2d1ba4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-711b-8b5e-7cbd6a2d1ba4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-711b-8b5e-7cbd6a2d1ba4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-711b-8b5e-7cbd6a2d1ba4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7c35-a07e-9a1761a651e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-711b-8b5e-7cbd6a2d1ba4" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7c35-a07e-9a1761a651e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-7e10-b506-12fb74d77a3a" xlink:href="apo-20260331.xsd#apo_BridgeInvestmentGroupHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7c35-a07e-9a1761a651e2" xlink:to="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-7e10-b506-12fb74d77a3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c9ac0-6b16-76f7-8c5a-90240f9c0b96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c9ac0-6b16-76f7-8c5a-90240f9c0b96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019c9ac0-6b16-7842-9d40-9aad89c1e8b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019c9ac0-6b16-7842-9d40-9aad89c1e8b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationRecognizedAssetAcquiredRestrictedCashAndEquivalents_019c9ac0-6b16-7636-b1d5-28100d7c2601" xlink:href="apo-20260331.xsd#apo_BusinessCombinationRecognizedAssetAcquiredRestrictedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:to="loc_apo_BusinessCombinationRecognizedAssetAcquiredRestrictedCashAndEquivalents_019c9ac0-6b16-7636-b1d5-28100d7c2601" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets_019c9ac0-6b16-751f-8fa5-da032b52feb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets_019c9ac0-6b16-751f-8fa5-da032b52feb8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationRecognizedAssetAcquiredDueFromRelatedParties_019c9ac0-6b16-7d8a-9a3a-2566ea23e36b" xlink:href="apo-20260331.xsd#apo_BusinessCombinationRecognizedAssetAcquiredDueFromRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:to="loc_apo_BusinessCombinationRecognizedAssetAcquiredDueFromRelatedParties_019c9ac0-6b16-7d8a-9a3a-2566ea23e36b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationRecognizedAssetAcquiredOtherAssets_019c9ac0-6b16-77d3-91b7-79b8935937b3" xlink:href="apo-20260331.xsd#apo_BusinessCombinationRecognizedAssetAcquiredOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:to="loc_apo_BusinessCombinationRecognizedAssetAcquiredOtherAssets_019c9ac0-6b16-77d3-91b7-79b8935937b3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019c9ac0-6b16-7598-b66b-e836bd0541ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019c9ac0-6b16-78c9-9809-78d47b51bd7e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019c9ac0-6b16-7598-b66b-e836bd0541ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityAccountsPayableAndAccruedLiabilities_019c9ac0-6b16-7a40-9f0f-4f5a9d8e97e8" xlink:href="apo-20260331.xsd#apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityAccountsPayableAndAccruedLiabilities_019c9ac0-6b16-7a40-9f0f-4f5a9d8e97e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityDueToRelatedParties_019c9ac0-6b16-7b1f-b893-789c4006fefd" xlink:href="apo-20260331.xsd#apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityDueToRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityDueToRelatedParties_019c9ac0-6b16-7b1f-b893-789c4006fefd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityLongTermDebt_019c9ac0-6b16-75dc-97ed-8fe12bac1bfa" xlink:href="apo-20260331.xsd#apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_apo_BusinessCombinationRecognizedLiabilityAssumedLiabilityLongTermDebt_019c9ac0-6b16-75dc-97ed-8fe12bac1bfa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019c9ac0-6b16-7814-b24b-7fa04f2795ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019c9ac0-6b16-7814-b24b-7fa04f2795ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019c9ac0-6b16-777f-b8b2-f4fc23fa38f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019c9ac0-6b16-777f-b8b2-f4fc23fa38f5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019c9ac0-6b16-76ff-b5b7-a7c9d901151b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_019c9ac0-6b16-76ff-b5b7-a7c9d901151b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationRecognizedAssetAcquiredToLiabilityAssumedExcessLessLessNoncontrollingInterests_019c9ac0-6b16-754b-9322-4c139fc2c1d2" xlink:href="apo-20260331.xsd#apo_BusinessCombinationRecognizedAssetAcquiredToLiabilityAssumedExcessLessLessNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_apo_BusinessCombinationRecognizedAssetAcquiredToLiabilityAssumedExcessLessLessNoncontrollingInterests_019c9ac0-6b16-754b-9322-4c139fc2c1d2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c9ac0-6b16-7b02-860c-e9bc813d9f16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-759d-a5a4-16064ade677e" xlink:to="loc_us-gaap_Goodwill_019c9ac0-6b16-7b02-860c-e9bc813d9f16" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/BusinessCombinationScheduleofFairValueandWeightedAverageEstimateUsefulLivesofIntangibleAssetsAcquiredDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#BusinessCombinationScheduleofFairValueandWeightedAverageEstimateUsefulLivesofIntangibleAssetsAcquiredDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/BusinessCombinationScheduleofFairValueandWeightedAverageEstimateUsefulLivesofIntangibleAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019c9ac0-6b16-714a-99a9-33448a12e45a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019c9ac0-6b16-7394-935e-ff613bf81f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019c9ac0-6b16-714a-99a9-33448a12e45a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019c9ac0-6b16-7394-935e-ff613bf81f6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c9ac0-6b16-794e-8b7d-577af03264de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019c9ac0-6b16-7394-935e-ff613bf81f6e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c9ac0-6b16-794e-8b7d-577af03264de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c9ac0-6b16-794e-8b7d-577af03264de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c9ac0-6b16-794e-8b7d-577af03264de" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c9ac0-6b16-794e-8b7d-577af03264de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c9ac0-6b16-7684-914f-1dfdaa1e1d4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c9ac0-6b16-794e-8b7d-577af03264de" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c9ac0-6b16-7684-914f-1dfdaa1e1d4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceContractsAcquiredInBusinessCombinationMember_019c9ac0-6b16-7967-a3e7-28ed1441b8e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceContractsAcquiredInBusinessCombinationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c9ac0-6b16-7684-914f-1dfdaa1e1d4c" xlink:to="loc_us-gaap_InsuranceContractsAcquiredInBusinessCombinationMember_019c9ac0-6b16-7967-a3e7-28ed1441b8e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019c9ac0-6b16-7c32-b5e0-67324c4b8ea0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c9ac0-6b16-7684-914f-1dfdaa1e1d4c" xlink:to="loc_us-gaap_TradeNamesMember_019c9ac0-6b16-7c32-b5e0-67324c4b8ea0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7bad-9e6e-46833bc27a10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_019c9ac0-6b16-7394-935e-ff613bf81f6e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7bad-9e6e-46833bc27a10" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7bad-9e6e-46833bc27a10_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7bad-9e6e-46833bc27a10" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7bad-9e6e-46833bc27a10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-701b-9513-4ddf1df8e2ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-7bad-9e6e-46833bc27a10" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-701b-9513-4ddf1df8e2ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-73cd-991d-f087143dbb2a" xlink:href="apo-20260331.xsd#apo_BridgeInvestmentGroupHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-701b-9513-4ddf1df8e2ce" xlink:to="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-73cd-991d-f087143dbb2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019c9ac0-6b16-76f4-a9c2-146a71ac8f84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019c9ac0-6b16-714a-99a9-33448a12e45a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019c9ac0-6b16-76f4-a9c2-146a71ac8f84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019c9ac0-6b16-715f-8a2f-b45d780065d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_019c9ac0-6b16-714a-99a9-33448a12e45a" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019c9ac0-6b16-715f-8a2f-b45d780065d0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/BusinessCombinationScheduleofUnauditedProFormaFinancialInformationDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#BusinessCombinationScheduleofUnauditedProFormaFinancialInformationDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/BusinessCombinationScheduleofUnauditedProFormaFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7d5f-8fb3-068d54ca2c4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-7593-83b1-774465429935" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7d5f-8fb3-068d54ca2c4d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-7593-83b1-774465429935" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-71ae-a73b-d17744451f3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c9ac0-6b16-7593-83b1-774465429935" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-71ae-a73b-d17744451f3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-71ae-a73b-d17744451f3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-71ae-a73b-d17744451f3c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-71ae-a73b-d17744451f3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7eda-88c7-b17042cdf340" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6b16-71ae-a73b-d17744451f3c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7eda-88c7-b17042cdf340" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-76f7-99f1-f57fa0fa8a1d" xlink:href="apo-20260331.xsd#apo_BridgeInvestmentGroupHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6b16-7eda-88c7-b17042cdf340" xlink:to="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6b16-76f7-99f1-f57fa0fa8a1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019c9ac0-6b16-7815-9b78-bf9c4c3452bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7d5f-8fb3-068d54ca2c4d" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019c9ac0-6b16-7815-9b78-bf9c4c3452bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_019c9ac0-6b16-7276-94f7-218f8cbdb56f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c9ac0-6b16-7d5f-8fb3-068d54ca2c4d" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_019c9ac0-6b16-7276-94f7-218f8cbdb56f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofInvestmentsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6b16-7b0d-aca4-fe1b127b4d62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6b16-7b0d-aca4-fe1b127b4d62" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7973-b5c2-62c50cb708c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6b16-7b0d-aca4-fe1b127b4d62" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7973-b5c2-62c50cb708c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7973-b5c2-62c50cb708c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7973-b5c2-62c50cb708c8" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7973-b5c2-62c50cb708c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7c64-8ac8-0d524ec48d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7973-b5c2-62c50cb708c8" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7c64-8ac8-0d524ec48d2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7e47-b6a3-c2d4ca810ab6" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7c64-8ac8-0d524ec48d2c" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7e47-b6a3-c2d4ca810ab6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-7d0c-aa25-4f3065ec00ae" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7c64-8ac8-0d524ec48d2c" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-7d0c-aa25-4f3065ec00ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7b54-ba41-7e35e18f62c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6b16-7b0d-aca4-fe1b127b4d62" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7b54-ba41-7e35e18f62c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7b54-ba41-7e35e18f62c7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7b54-ba41-7e35e18f62c7" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7b54-ba41-7e35e18f62c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7155-b254-9866dd7e641e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7b54-ba41-7e35e18f62c7" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7155-b254-9866dd7e641e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-798d-b3fb-aa92cb71fea0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsolidatedEntityExcludingVieMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7155-b254-9866dd7e641e" xlink:to="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-798d-b3fb-aa92cb71fea0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6b16-7691-8ec1-100f4ef4e65c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6b16-7691-8ec1-100f4ef4e65c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019c9ac0-6b16-714f-acc3-ff07de1ed854" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_EquityMethodInvestments_019c9ac0-6b16-714f-acc3-ff07de1ed854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PerformanceAllocations_019c9ac0-6b16-7d87-86fe-e7c40ac32c57" xlink:href="apo-20260331.xsd#apo_PerformanceAllocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_apo_PerformanceAllocations_019c9ac0-6b16-7d87-86fe-e7c40ac32c57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019c9ac0-6b16-7c6c-8630-63daeca66953" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_OtherInvestments_019c9ac0-6b16-7c6c-8630-63daeca66953" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019c9ac0-6b16-7496-9a17-91c2562363e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_Investments_019c9ac0-6b16-7496-9a17-91c2562363e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7b6a-9846-92c72e7a4ade" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7b6a-9846-92c72e7a4ade" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_019c9ac0-6b16-7e89-904d-fa80522edf2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_TradingSecurities_019c9ac0-6b16-7e89-904d-fa80522edf2f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019c9ac0-6b16-7dcf-a05d-9ca550595f9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019c9ac0-6b16-7dcf-a05d-9ca550595f9a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019c9ac0-6b16-76e9-b125-6fcaa6aa1cfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019c9ac0-6b16-76e9-b125-6fcaa6aa1cfd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsFairValueDisclosure_019c9ac0-6b16-70b7-8033-3ca6843ce376" xlink:href="apo-20260331.xsd#apo_InvestmentFundsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_apo_InvestmentFundsFairValueDisclosure_019c9ac0-6b16-70b7-8033-3ca6843ce376" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyLoansReceivable_019c9ac0-6b16-7de8-8486-7d8ee167b2fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyLoansReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_PolicyLoansReceivable_019c9ac0-6b16-7de8-8486-7d8ee167b2fe" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundsWithheldAtInterest_019c9ac0-6b16-7d1e-a0b9-b4fa00f2e6f3" xlink:href="apo-20260331.xsd#apo_FundsWithheldAtInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_apo_FundsWithheldAtInterest_019c9ac0-6b16-7d1e-a0b9-b4fa00f2e6f3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019c9ac0-6b16-7b29-b21c-b00d0bdcf934" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_DerivativeAssets_019c9ac0-6b16-7b29-b21c-b00d0bdcf934" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019c9ac0-6b16-7bbd-9b94-e23057fa5193" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_ShortTermInvestments_019c9ac0-6b16-7bbd-9b94-e23057fa5193" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentsIncludingRelatedParty_019c9ac0-6b16-7283-8ace-b681c404c0f5" xlink:href="apo-20260331.xsd#apo_InvestmentsIncludingRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_apo_InvestmentsIncludingRelatedParty_019c9ac0-6b16-7283-8ace-b681c404c0f5" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019c9ac0-6b16-7db7-a1e7-68334f4957c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6b16-76b6-98fa-dc8c6ffbcf07" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019c9ac0-6b16-7db7-a1e7-68334f4957c8" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofRealizedandNetChangeinUnrealizedGainsLossesReportedinNetGainsLossesFromInvestmentActivitiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofRealizedandNetChangeinUnrealizedGainsLossesReportedinNetGainsLossesFromInvestmentActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofRealizedandNetChangeinUnrealizedGainsLossesReportedinNetGainsLossesFromInvestmentActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7613-9ece-f0efcfb66bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-7428-9f5c-57c3ab7ec356" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7613-9ece-f0efcfb66bf9" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-7428-9f5c-57c3ab7ec356" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7abe-a65b-605dca6c6964" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-7428-9f5c-57c3ab7ec356" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7abe-a65b-605dca6c6964" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7abe-a65b-605dca6c6964_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7abe-a65b-605dca6c6964" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-7abe-a65b-605dca6c6964_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-790f-b6c3-c5c86120d3af" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-7abe-a65b-605dca6c6964" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-790f-b6c3-c5c86120d3af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-7e3a-8500-5a25bcbf3828" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsolidatedEntityExcludingVieMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-790f-b6c3-c5c86120d3af" xlink:to="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-7e3a-8500-5a25bcbf3828" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-75aa-a389-de20aa598a62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-7428-9f5c-57c3ab7ec356" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-75aa-a389-de20aa598a62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-75aa-a389-de20aa598a62_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-75aa-a389-de20aa598a62" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-75aa-a389-de20aa598a62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7b19-9dc5-77946fb70a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-75aa-a389-de20aa598a62" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7b19-9dc5-77946fb70a3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7bd9-b919-3aed041a6404" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7b19-9dc5-77946fb70a3c" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-7bd9-b919-3aed041a6404" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_019c9ac0-6b16-7ce9-8fde-443281002809" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7613-9ece-f0efcfb66bf9" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_019c9ac0-6b16-7ce9-8fde-443281002809" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_019c9ac0-6b16-7f62-9f3b-cfcaadd8482a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7613-9ece-f0efcfb66bf9" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_019c9ac0-6b16-7f62-9f3b-cfcaadd8482a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019c9ac0-6b16-744b-a3ab-e465c1e67fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7613-9ece-f0efcfb66bf9" xlink:to="loc_us-gaap_GainLossOnInvestments_019c9ac0-6b16-744b-a3ab-e465c1e67fc2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofPerformanceAllocationsandPerformanceAllocationsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofPerformanceAllocationsandPerformanceAllocationsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofPerformanceAllocationsandPerformanceAllocationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7f18-9001-65d4a18fb03b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-72e6-8cc2-fc8e7c27cc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7f18-9001-65d4a18fb03b" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-72e6-8cc2-fc8e7c27cc7d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-76b2-9bd3-4c6acd95f580" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-72e6-8cc2-fc8e7c27cc7d" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-76b2-9bd3-4c6acd95f580" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-76b2-9bd3-4c6acd95f580_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-76b2-9bd3-4c6acd95f580" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-76b2-9bd3-4c6acd95f580_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-770c-99e6-ff3c5d4c89a5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b16-76b2-9bd3-4c6acd95f580" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-770c-99e6-ff3c5d4c89a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-7b38-b797-2192a1ce35b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsolidatedEntityExcludingVieMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-770c-99e6-ff3c5d4c89a5" xlink:to="loc_us-gaap_ConsolidatedEntityExcludingVieMember_019c9ac0-6b16-7b38-b797-2192a1ce35b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b16-7942-960f-6fee7b631ac7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b16-770c-99e6-ff3c5d4c89a5" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b16-7942-960f-6fee7b631ac7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7282-be8c-08a322e3c6ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019c9ac0-6b16-72e6-8cc2-fc8e7c27cc7d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7282-be8c-08a322e3c6ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7282-be8c-08a322e3c6ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7282-be8c-08a322e3c6ce" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-7282-be8c-08a322e3c6ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-713a-9532-4fc79252a628" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-7282-be8c-08a322e3c6ce" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-713a-9532-4fc79252a628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-73de-b88d-dd34fa5e6d9b" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-713a-9532-4fc79252a628" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6b16-73de-b88d-dd34fa5e6d9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PerformanceAllocationRollForward_019d1d63-ea49-7ebc-95cd-05e19f6a6d85" xlink:href="apo-20260331.xsd#apo_PerformanceAllocationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019c9ac0-6b16-7f18-9001-65d4a18fb03b" xlink:to="loc_apo_PerformanceAllocationRollForward_019d1d63-ea49-7ebc-95cd-05e19f6a6d85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PerformanceAllocations_019c9ac0-6b16-7427-80af-31ce2afdd52d" xlink:href="apo-20260331.xsd#apo_PerformanceAllocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_PerformanceAllocationRollForward_019d1d63-ea49-7ebc-95cd-05e19f6a6d85" xlink:to="loc_apo_PerformanceAllocations_019c9ac0-6b16-7427-80af-31ce2afdd52d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofAmortizedCostAllowanceforCreditLossesGrossUnrealizedGainsandLossesandFairValueofAFSInvestmentsbyAssetTypeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofAmortizedCostAllowanceforCreditLossesGrossUnrealizedGainsandLossesandFairValueofAFSInvestmentsbyAssetTypeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofAmortizedCostAllowanceforCreditLossesGrossUnrealizedGainsandLossesandFairValueofAFSInvestmentsbyAssetTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7d57-a864-21103a875a82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7ac6-877f-070777ffd170" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7d57-a864-21103a875a82" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7ac6-877f-070777ffd170" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-77c8-a8c2-f0461c193dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7ac6-877f-070777ffd170" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-77c8-a8c2-f0461c193dfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-77c8-a8c2-f0461c193dfc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-77c8-a8c2-f0461c193dfc" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-77c8-a8c2-f0461c193dfc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-77c8-a8c2-f0461c193dfc" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019c9ac0-6b16-701d-8909-7f90a80da51d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019c9ac0-6b16-701d-8909-7f90a80da51d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6b16-7038-a047-02a5fb6c194a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6b16-7038-a047-02a5fb6c194a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtMember_019c9ac0-6b16-7a4f-a5cc-89625991f517" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_ForeignGovernmentDebtMember_019c9ac0-6b16-7a4f-a5cc-89625991f517" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-7d2a-9319-901cc799b8e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-7d2a-9319-901cc799b8e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6b16-788d-aed8-0dca5681dbdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6b16-788d-aed8-0dca5681dbdb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-709b-80d8-70a5d0535adc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-709b-80d8-70a5d0535adc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-7cad-bb02-c5a12b4f51d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-7cad-bb02-c5a12b4f51d2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7224-b550-474cdb6abfb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d20-b150-cf90abbd9d54" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7224-b550-474cdb6abfb6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7dd7-a1ea-8b57c0fe5932" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7ac6-877f-070777ffd170" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7dd7-a1ea-8b57c0fe5932" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7dd7-a1ea-8b57c0fe5932_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7dd7-a1ea-8b57c0fe5932" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7dd7-a1ea-8b57c0fe5932_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-77a6-b0df-612427d2a68a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7dd7-a1ea-8b57c0fe5932" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-77a6-b0df-612427d2a68a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-7e2d-bd89-4c89e22ac781" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-77a6-b0df-612427d2a68a" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-7e2d-bd89-4c89e22ac781" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-7abb-8a8a-2b64f77872cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-77a6-b0df-612427d2a68a" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-7abb-8a8a-2b64f77872cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019c9ac0-6b16-708d-a9e4-c7ebfffb4653" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7d57-a864-21103a875a82" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019c9ac0-6b16-708d-a9e4-c7ebfffb4653" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019c9ac0-6b16-75e3-876d-428652167899" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7d57-a864-21103a875a82" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019c9ac0-6b16-75e3-876d-428652167899" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019c9ac0-6b16-7a03-83b0-36c4acb9918b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7d57-a864-21103a875a82" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019c9ac0-6b16-7a03-83b0-36c4acb9918b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019c9ac0-6b16-745f-8a4c-374532f85896" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7d57-a864-21103a875a82" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019c9ac0-6b16-745f-8a4c-374532f85896" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7327-a198-8e1c360a02cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7d57-a864-21103a875a82" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7327-a198-8e1c360a02cd" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofAmortizedCostandFairValueofAFSSecuritiesIncludingRelatedPartiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofAmortizedCostandFairValueofAFSSecuritiesIncludingRelatedPartiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofAmortizedCostandFairValueofAFSSecuritiesIncludingRelatedPartiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7b05-bbc3-c1062d26bfbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7a49-a106-3dae19c9ca2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7b05-bbc3-c1062d26bfbb" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7a49-a106-3dae19c9ca2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7993-a9dc-d1f097c179d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7a49-a106-3dae19c9ca2a" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7993-a9dc-d1f097c179d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7993-a9dc-d1f097c179d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7993-a9dc-d1f097c179d6" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7993-a9dc-d1f097c179d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-74cf-b034-58f4bd1eac43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7993-a9dc-d1f097c179d6" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-74cf-b034-58f4bd1eac43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-79a1-9784-1e95e0f03c68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-74cf-b034-58f4bd1eac43" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-79a1-9784-1e95e0f03c68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-7c45-831e-e23e92b4a54b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-74cf-b034-58f4bd1eac43" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-7c45-831e-e23e92b4a54b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7b05-bbc3-c1062d26bfbb" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019c9ac0-6b16-7a83-aa6c-20004819a3b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019c9ac0-6b16-7a83-aa6c-20004819a3b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019c9ac0-6b16-7580-a355-535a0e3f38c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019c9ac0-6b16-7580-a355-535a0e3f38c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019c9ac0-6b16-7da4-aa08-a78857dcccb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019c9ac0-6b16-7da4-aa08-a78857dcccb9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019c9ac0-6b16-798f-98c7-a999fe6e8e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019c9ac0-6b16-798f-98c7-a999fe6e8e0d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019c9ac0-6b16-7eee-b11d-6e75f4b87088" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019c9ac0-6b16-7eee-b11d-6e75f4b87088" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019c9ac0-6b16-7b38-b60a-3c84036f2c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019c9ac0-6b16-759d-a496-22bf4e67e56f" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019c9ac0-6b16-7b38-b60a-3c84036f2c9c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7b05-bbc3-c1062d26bfbb" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019c9ac0-6b16-76cb-a37b-5fbb0a0c2a10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019c9ac0-6b16-76cb-a37b-5fbb0a0c2a10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019c9ac0-6b16-7f2d-9af9-e8d280ef03bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019c9ac0-6b16-7f2d-9af9-e8d280ef03bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019c9ac0-6b16-77a3-a237-3c8b126eee59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019c9ac0-6b16-77a3-a237-3c8b126eee59" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019c9ac0-6b16-7b27-a8a3-37c95c5db49e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019c9ac0-6b16-7b27-a8a3-37c95c5db49e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019c9ac0-6b16-7d8b-9da1-81ca30b41a5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019c9ac0-6b16-7d8b-9da1-81ca30b41a5b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7ba8-ad74-e4de714441c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_019c9ac0-6b16-75b1-92d3-cb737ff9f46f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7ba8-ad74-e4de714441c5" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofUnrealizedLossesonAFSSecuritiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofUnrealizedLossesonAFSSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofUnrealizedLossesonAFSSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7217-82fb-adbc5d3353b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7217-82fb-adbc5d3353b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-71f9-9259-b7a92aff86cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7217-82fb-adbc5d3353b5" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-71f9-9259-b7a92aff86cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-71f9-9259-b7a92aff86cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-71f9-9259-b7a92aff86cd" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-71f9-9259-b7a92aff86cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-71f9-9259-b7a92aff86cd" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019c9ac0-6b16-7b74-9ee4-63e613185783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019c9ac0-6b16-7b74-9ee4-63e613185783" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6b16-7d39-b71f-47c1d8c0131b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6b16-7d39-b71f-47c1d8c0131b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtMember_019c9ac0-6b16-7ac6-8088-d73939ce9435" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_ForeignGovernmentDebtMember_019c9ac0-6b16-7ac6-8088-d73939ce9435" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-729c-b565-236a33e0d565" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-729c-b565-236a33e0d565" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6b16-7e49-8274-75204eecf2f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6b16-7e49-8274-75204eecf2f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-748f-867b-0a1333f82fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-748f-867b-0a1333f82fc9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-78bd-b0dd-709a34654b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-78bd-b0dd-709a34654b2e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7804-86cb-0f639f967999" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7697-822a-ca106e7f68e3" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7804-86cb-0f639f967999" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7c46-a94d-e30d79dcb081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-7217-82fb-adbc5d3353b5" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7c46-a94d-e30d79dcb081" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7c46-a94d-e30d79dcb081_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7c46-a94d-e30d79dcb081" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7c46-a94d-e30d79dcb081_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-728c-b559-b3d1aa3708c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7c46-a94d-e30d79dcb081" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-728c-b559-b3d1aa3708c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-7422-9c4f-621d0a449c98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-728c-b559-b3d1aa3708c9" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-7422-9c4f-621d0a449c98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-72d4-a19f-8482f3ac7d52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-728c-b559-b3d1aa3708c9" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-72d4-a19f-8482f3ac7d52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019c9ac0-6b16-764d-9237-02d734f9113d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019c9ac0-6b16-764d-9237-02d734f9113d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019c9ac0-6b16-7580-8f8c-b1f6c598331b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019c9ac0-6b16-7580-8f8c-b1f6c598331b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019c9ac0-6b16-764f-bc6d-60bf6ff2c5c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019c9ac0-6b16-764f-bc6d-60bf6ff2c5c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019c9ac0-6b16-7ef2-bd2b-ba9a5b58cbc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019c9ac0-6b16-7ef2-bd2b-ba9a5b58cbc7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019c9ac0-6b16-7956-95d6-cf25cfb1fe9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019c9ac0-6b16-7956-95d6-cf25cfb1fe9a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019c9ac0-6b16-75b3-ae54-25df357eb043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e0c-84a0-f0bc7e9a3a12" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019c9ac0-6b16-75b3-ae54-25df357eb043" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofNumberofAFSSecuritiesinUnrealizedLossPositionIncludingRelatedPartiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofNumberofAFSSecuritiesinUnrealizedLossPositionIncludingRelatedPartiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofNumberofAFSSecuritiesinUnrealizedLossPositionIncludingRelatedPartiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019c9ac0-6b16-7773-a6b5-fdfd2e850a36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019c9ac0-6b16-78ab-b602-2465d28bc8f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019c9ac0-6b16-7773-a6b5-fdfd2e850a36" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019c9ac0-6b16-78ab-b602-2465d28bc8f1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7323-9914-a7c34f49d21f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019c9ac0-6b16-78ab-b602-2465d28bc8f1" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7323-9914-a7c34f49d21f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7323-9914-a7c34f49d21f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7323-9914-a7c34f49d21f" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7323-9914-a7c34f49d21f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-75ae-bee0-fa63515b5042" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7323-9914-a7c34f49d21f" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-75ae-bee0-fa63515b5042" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-785e-a5a1-2d8cad893432" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-75ae-bee0-fa63515b5042" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-785e-a5a1-2d8cad893432" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019c9ac0-6b16-7f39-ad8d-e9a054b2aa4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019c9ac0-6b16-7773-a6b5-fdfd2e850a36" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019c9ac0-6b16-7f39-ad8d-e9a054b2aa4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019c9ac0-6b16-710a-87d1-bbf5c59c4c11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019c9ac0-6b16-7773-a6b5-fdfd2e850a36" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019c9ac0-6b16-710a-87d1-bbf5c59c4c11" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofActivityinAllowanceforCreditLossesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofActivityinAllowanceforCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofActivityinAllowanceforCreditLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems_019c9ac0-6b16-7834-b4c8-d0ea6ef08e83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTable_019c9ac0-6b16-7e3f-9a53-31e0a8c1b638" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems_019c9ac0-6b16-7834-b4c8-d0ea6ef08e83" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTable_019c9ac0-6b16-7e3f-9a53-31e0a8c1b638" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7e77-9dce-9a5b0a8ca8ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTable_019c9ac0-6b16-7e3f-9a53-31e0a8c1b638" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7e77-9dce-9a5b0a8ca8ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7e77-9dce-9a5b0a8ca8ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7e77-9dce-9a5b0a8ca8ec" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7e77-9dce-9a5b0a8ca8ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d8f-ba02-919428bff057" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7e77-9dce-9a5b0a8ca8ec" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d8f-ba02-919428bff057" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-7343-9760-b218e804cc0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d8f-ba02-919428bff057" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-7343-9760-b218e804cc0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-7a44-85e6-44ac5e14d1c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d8f-ba02-919428bff057" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-7a44-85e6-44ac5e14d1c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-7f79-9191-19c7d3f69c3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d8f-ba02-919428bff057" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-7f79-9191-19c7d3f69c3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7bdb-a005-82c7d2e3422b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7d8f-ba02-919428bff057" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7bdb-a005-82c7d2e3422b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7e77-8eca-7c94012747d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossTable_019c9ac0-6b16-7e3f-9a53-31e0a8c1b638" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7e77-8eca-7c94012747d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7e77-8eca-7c94012747d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7e77-8eca-7c94012747d9" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7e77-8eca-7c94012747d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7c2f-918f-7cd86e22301b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b16-7e77-8eca-7c94012747d9" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7c2f-918f-7cd86e22301b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-743f-aea5-fc8cd77389d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7c2f-918f-7cd86e22301b" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b16-743f-aea5-fc8cd77389d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-7f24-8e87-c92a9b311823" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b16-7c2f-918f-7cd86e22301b" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6b16-7f24-8e87-c92a9b311823" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019c9ac0-6b16-7de4-ae7c-43587049e342" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems_019c9ac0-6b16-7834-b4c8-d0ea6ef08e83" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019c9ac0-6b16-7de4-ae7c-43587049e342" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019c9ac0-6b16-7862-bc9e-5b929f8decc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019c9ac0-6b16-7de4-ae7c-43587049e342" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019c9ac0-6b16-7862-bc9e-5b929f8decc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded_019c9ac0-6b16-7c9e-8cf9-5c5a2f4707b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019c9ac0-6b16-7de4-ae7c-43587049e342" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded_019c9ac0-6b16-7c9e-8cf9-5c5a2f4707b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold_019c9ac0-6b16-7dc4-9d91-8f6387ad4976" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019c9ac0-6b16-7de4-ae7c-43587049e342" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold_019c9ac0-6b16-7dc4-9d91-8f6387ad4976" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019c9ac0-6b16-75b6-9be0-fbf9c08fc836" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019c9ac0-6b16-7de4-ae7c-43587049e342" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019c9ac0-6b16-75b6-9be0-fbf9c08fc836" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019c9ac0-6b16-783b-b162-9bd141f10fb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofNetInvestmentIncomebyAssetClassDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofNetInvestmentIncomebyAssetClassDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofNetInvestmentIncomebyAssetClassDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b16-7f8e-b081-3631339118a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b16-7313-a086-e869571985ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b16-7f8e-b081-3631339118a5" xlink:to="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b16-7313-a086-e869571985ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6b16-7983-89cb-ffab3f01f35f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b16-7313-a086-e869571985ad" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6b16-7983-89cb-ffab3f01f35f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7983-89cb-ffab3f01f35f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6b16-7983-89cb-ffab3f01f35f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7983-89cb-ffab3f01f35f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6b16-7983-89cb-ffab3f01f35f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6b16-77a0-9ed2-022249593fb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:to="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6b16-77a0-9ed2-022249593fb1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6b16-790a-b330-df3e3eafedba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:to="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6b16-790a-b330-df3e3eafedba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6b16-7b74-9414-e6921c62299a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:to="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6b16-7b74-9414-e6921c62299a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019c9ac0-6b16-7d15-8f74-65c67923d6ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019c9ac0-6b16-7d15-8f74-65c67923d6ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsMember_019c9ac0-6b16-73fe-af3f-33537fddaa8b" xlink:href="apo-20260331.xsd#apo_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:to="loc_apo_InvestmentFundsMember_019c9ac0-6b16-73fe-af3f-33537fddaa8b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundsHeldUnderReinsuranceAgreementsAssetMember_019c9ac0-6b16-7c2e-9e97-9f2b0b521ce8" xlink:href="apo-20260331.xsd#apo_FundsHeldUnderReinsuranceAgreementsAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:to="loc_apo_FundsHeldUnderReinsuranceAgreementsAssetMember_019c9ac0-6b16-7c2e-9e97-9f2b0b521ce8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6b16-73ac-b4a3-a759298c5b9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6b16-7918-b790-1595de4eea17" xlink:to="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6b16-73ac-b4a3-a759298c5b9d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-783c-ad2e-00052d0973fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b16-7313-a086-e869571985ad" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-783c-ad2e-00052d0973fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-783c-ad2e-00052d0973fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-783c-ad2e-00052d0973fb" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-783c-ad2e-00052d0973fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6b16-75d7-b56d-bc9423858885" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6b16-783c-ad2e-00052d0973fb" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6b16-75d7-b56d-bc9423858885" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-73a2-9796-bd61341a4ea7" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6b16-75d7-b56d-bc9423858885" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6b16-73a2-9796-bd61341a4ea7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019c9ac0-6b16-7870-af5f-153bdeb1e9d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b16-7f8e-b081-3631339118a5" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019c9ac0-6b16-7870-af5f-153bdeb1e9d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019c9ac0-6b16-74e7-8bab-57bd7ee34183" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b16-7f8e-b081-3631339118a5" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019c9ac0-6b16-74e7-8bab-57bd7ee34183" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019c9ac0-6b16-7919-9e3a-4810ba4fd525" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b16-7f8e-b081-3631339118a5" xlink:to="loc_us-gaap_NetInvestmentIncome_019c9ac0-6b16-7919-9e3a-4810ba4fd525" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofRemainingContractualMaturitiesofRepurchaseAgreementsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofRemainingContractualMaturitiesofRepurchaseAgreementsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofRemainingContractualMaturitiesofRepurchaseAgreementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems_019c9ac0-6b16-7448-ae0f-6efba78e080f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable_019c9ac0-6b16-7fde-8948-8f0ba119aa8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems_019c9ac0-6b16-7448-ae0f-6efba78e080f" xlink:to="loc_us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable_019c9ac0-6b16-7fde-8948-8f0ba119aa8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019c9ac0-6b16-764c-83f4-6e5a15c0a2fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAssetsSoldUnderAgreementsToRepurchaseTable_019c9ac0-6b16-7fde-8948-8f0ba119aa8a" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019c9ac0-6b16-764c-83f4-6e5a15c0a2fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019c9ac0-6b16-764c-83f4-6e5a15c0a2fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019c9ac0-6b16-764c-83f4-6e5a15c0a2fb" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019c9ac0-6b16-764c-83f4-6e5a15c0a2fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019c9ac0-6b16-7262-8c1e-4c29ade02dce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019c9ac0-6b16-764c-83f4-6e5a15c0a2fb" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019c9ac0-6b16-7262-8c1e-4c29ade02dce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaturityUpTo30DaysMember_019c9ac0-6b16-7626-94e2-a39297cb1502" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MaturityUpTo30DaysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019c9ac0-6b16-7262-8c1e-4c29ade02dce" xlink:to="loc_us-gaap_MaturityUpTo30DaysMember_019c9ac0-6b16-7626-94e2-a39297cb1502" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_Maturity91To364DaysMember_019c9ac0-6b16-7833-b2a9-c0d30907c544" xlink:href="apo-20260331.xsd#apo_Maturity91To364DaysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019c9ac0-6b16-7262-8c1e-4c29ade02dce" xlink:to="loc_apo_Maturity91To364DaysMember_019c9ac0-6b16-7833-b2a9-c0d30907c544" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MaturityOneYearOrGreaterMember_019c9ac0-6b16-77d3-9801-ed31be803d9a" xlink:href="apo-20260331.xsd#apo_MaturityOneYearOrGreaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019c9ac0-6b16-7262-8c1e-4c29ade02dce" xlink:to="loc_apo_MaturityOneYearOrGreaterMember_019c9ac0-6b16-77d3-9801-ed31be803d9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts_019c9ac0-6b16-76ff-b267-59cf4905e54a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems_019c9ac0-6b16-7448-ae0f-6efba78e080f" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts_019c9ac0-6b16-76ff-b267-59cf4905e54a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofSecuritiesPledgedAsCollateralForRepurchaseAgreementsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofSecuritiesPledgedAsCollateralForRepurchaseAgreementsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofSecuritiesPledgedAsCollateralForRepurchaseAgreementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e8a-9656-4fe23b282cde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-77ce-ab68-60404a1fbdf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e8a-9656-4fe23b282cde" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-77ce-ab68-60404a1fbdf9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7c1d-b23f-b678e259bf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-77ce-ab68-60404a1fbdf9" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7c1d-b23f-b678e259bf1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7c1d-b23f-b678e259bf1d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7c1d-b23f-b678e259bf1d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7c1d-b23f-b678e259bf1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7c1d-b23f-b678e259bf1d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019c9ac0-6b16-73fd-aab2-19db150081ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019c9ac0-6b16-73fd-aab2-19db150081ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtMember_019c9ac0-6b16-72e0-a9fd-3803825e5f0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:to="loc_us-gaap_ForeignGovernmentDebtMember_019c9ac0-6b16-72e0-a9fd-3803825e5f0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-73ff-a902-6b8fd683d89d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6b16-73ff-a902-6b8fd683d89d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6b16-7bb5-a25a-e47ba4cc5264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6b16-7bb5-a25a-e47ba4cc5264" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-70a5-9ed2-7597f6bb4a07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6b16-70a5-9ed2-7597f6bb4a07" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-72e9-a2bf-542527125aae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6b16-72e9-a2bf-542527125aae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7ff9-a2e6-7842d42386e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7582-a8e9-58864831a7ad" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6b16-7ff9-a2e6-7842d42386e3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_019c9ac0-6b16-727c-a730-b071d1486b09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-77ce-ab68-60404a1fbdf9" xlink:to="loc_us-gaap_PledgedStatusAxis_019c9ac0-6b16-727c-a730-b071d1486b09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019c9ac0-6b16-727c-a730-b071d1486b09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_019c9ac0-6b16-727c-a730-b071d1486b09" xlink:to="loc_us-gaap_PledgedStatusDomain_019c9ac0-6b16-727c-a730-b071d1486b09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019c9ac0-6b16-7a07-a4d5-15375a5172f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_019c9ac0-6b16-727c-a730-b071d1486b09" xlink:to="loc_us-gaap_PledgedStatusDomain_019c9ac0-6b16-7a07-a4d5-15375a5172f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_019c9ac0-6b16-72d0-ae10-27e023339209" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_019c9ac0-6b16-7a07-a4d5-15375a5172f3" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_019c9ac0-6b16-72d0-ae10-27e023339209" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgingPurposeAxis_019c9ac0-6b16-7ce9-b347-4281ecae5b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgingPurposeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019c9ac0-6b16-77ce-ab68-60404a1fbdf9" xlink:to="loc_us-gaap_PledgingPurposeAxis_019c9ac0-6b16-7ce9-b347-4281ecae5b2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgingPurposeDomain_019c9ac0-6b16-7ce9-b347-4281ecae5b2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgingPurposeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgingPurposeAxis_019c9ac0-6b16-7ce9-b347-4281ecae5b2e" xlink:to="loc_us-gaap_PledgingPurposeDomain_019c9ac0-6b16-7ce9-b347-4281ecae5b2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgingPurposeDomain_019c9ac0-6b16-711e-b7b4-9cb85e35b0e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgingPurposeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgingPurposeAxis_019c9ac0-6b16-7ce9-b347-4281ecae5b2e" xlink:to="loc_us-gaap_PledgingPurposeDomain_019c9ac0-6b16-711e-b7b4-9cb85e35b0e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_019c9ac0-6b16-7381-b668-638dc53a397e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgingPurposeDomain_019c9ac0-6b16-711e-b7b4-9cb85e35b0e3" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_019c9ac0-6b16-7381-b668-638dc53a397e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019c9ac0-6b16-736b-92dc-d803f1f55a3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e8a-9656-4fe23b282cde" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019c9ac0-6b16-736b-92dc-d803f1f55a3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7a00-ad85-1af13726f4f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019c9ac0-6b16-7e8a-9656-4fe23b282cde" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6b16-7a00-ad85-1af13726f4f0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofMortgageLoanPortfoliowithFairValueOptionLoansDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofMortgageLoanPortfoliowithFairValueOptionLoansDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofMortgageLoanPortfoliowithFairValueOptionLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6b17-7cc7-b9ea-12c0df2bcb37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6b16-74ea-8534-6f44b34560fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6b17-7cc7-b9ea-12c0df2bcb37" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6b16-74ea-8534-6f44b34560fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7ab6-91e4-d84daeea31a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6b16-74ea-8534-6f44b34560fc" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7ab6-91e4-d84daeea31a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7ab6-91e4-d84daeea31a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7ab6-91e4-d84daeea31a2" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7ab6-91e4-d84daeea31a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7316-93b5-737339fccd41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b16-7ab6-91e4-d84daeea31a2" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7316-93b5-737339fccd41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MortgageLoansMember_019c9ac0-6b16-7824-8da9-99c342cfc20f" xlink:href="apo-20260331.xsd#apo_MortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b16-7316-93b5-737339fccd41" xlink:to="loc_apo_MortgageLoansMember_019c9ac0-6b16-7824-8da9-99c342cfc20f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019c9ac0-6b16-7c4b-9cdd-76ddc16d479e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6b16-74ea-8534-6f44b34560fc" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019c9ac0-6b16-7c4b-9cdd-76ddc16d479e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019c9ac0-6b16-7c4b-9cdd-76ddc16d479e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019c9ac0-6b16-7c4b-9cdd-76ddc16d479e" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019c9ac0-6b16-7c4b-9cdd-76ddc16d479e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019c9ac0-6b17-7be3-8531-93f69a824371" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019c9ac0-6b16-7c4b-9cdd-76ddc16d479e" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019c9ac0-6b17-7be3-8531-93f69a824371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019c9ac0-6b17-7da1-b500-66e6b1c327bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019c9ac0-6b17-7be3-8531-93f69a824371" xlink:to="loc_us-gaap_RealEstateLoanMember_019c9ac0-6b17-7da1-b500-66e6b1c327bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_UnderDevelopmentMember_019c9ac0-6b17-7893-a5a6-3676eadcc9d2" xlink:href="apo-20260331.xsd#apo_UnderDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019c9ac0-6b17-7be3-8531-93f69a824371" xlink:to="loc_apo_UnderDevelopmentMember_019c9ac0-6b17-7893-a5a6-3676eadcc9d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019c9ac0-6b17-72a5-b7f5-35635ee3fd88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6b16-74ea-8534-6f44b34560fc" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019c9ac0-6b17-72a5-b7f5-35635ee3fd88" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019c9ac0-6b17-72a5-b7f5-35635ee3fd88_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019c9ac0-6b17-72a5-b7f5-35635ee3fd88" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019c9ac0-6b17-72a5-b7f5-35635ee3fd88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019c9ac0-6b17-7126-8086-b1059f56b3f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019c9ac0-6b17-72a5-b7f5-35635ee3fd88" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019c9ac0-6b17-7126-8086-b1059f56b3f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019c9ac0-6b17-74fe-90b1-52d49403b788" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019c9ac0-6b17-7126-8086-b1059f56b3f5" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019c9ac0-6b17-74fe-90b1-52d49403b788" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019c9ac0-6b17-7695-9431-4c033aa8e75a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019c9ac0-6b17-7126-8086-b1059f56b3f5" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019c9ac0-6b17-7695-9431-4c033aa8e75a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance_019c9ac0-6b17-73f8-b4cb-0e1ed7adf6ab" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6b17-7cc7-b9ea-12c0df2bcb37" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance_019c9ac0-6b17-73f8-b4cb-0e1ed7adf6ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssetsMarkToFairValue_019c9ac0-6b17-7721-9f3e-7d7e542c7d08" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssetsMarkToFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6b17-7cc7-b9ea-12c0df2bcb37" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssetsMarkToFairValue_019c9ac0-6b17-7721-9f3e-7d7e542c7d08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssets_019c9ac0-6b17-7702-8c3b-73ef83b563ea" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6b17-7cc7-b9ea-12c0df2bcb37" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssets_019c9ac0-6b17-7702-8c3b-73ef83b563ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssetsIncludingLoansHeldByVariableInterestEntities_019c9ac0-6b17-7271-9182-49306617a87d" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssetsIncludingLoansHeldByVariableInterestEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6b17-7cc7-b9ea-12c0df2bcb37" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssetsIncludingLoansHeldByVariableInterestEntities_019c9ac0-6b17-7271-9182-49306617a87d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofDistributionofCommercialandResidentialMortgageLoansPercentagebyGeographicalLocationDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofDistributionofCommercialandResidentialMortgageLoansPercentagebyGeographicalLocationDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofDistributionofCommercialandResidentialMortgageLoansPercentagebyGeographicalLocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019c9ac0-6b17-7eca-b5ed-0bce332859af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019c9ac0-6b17-70bd-bef6-bb16be6e7297" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019c9ac0-6b17-7eca-b5ed-0bce332859af" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019c9ac0-6b17-70bd-bef6-bb16be6e7297" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019c9ac0-6b17-77e9-b420-bb6bd044c4fc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019c9ac0-6b17-70bd-bef6-bb16be6e7297" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019c9ac0-6b17-77e9-b420-bb6bd044c4fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-77e9-b420-bb6bd044c4fc_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019c9ac0-6b17-77e9-b420-bb6bd044c4fc" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-77e9-b420-bb6bd044c4fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019c9ac0-6b17-77e9-b420-bb6bd044c4fc" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ApartmentBuildingMember_019c9ac0-6b17-72bf-a38c-ec15e1f8c974" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ApartmentBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:to="loc_srt_ApartmentBuildingMember_019c9ac0-6b17-72bf-a38c-ec15e1f8c974" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_IndustrialPropertyMember_019c9ac0-6b17-7993-80fa-ba6df0d5602d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_IndustrialPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:to="loc_srt_IndustrialPropertyMember_019c9ac0-6b17-7993-80fa-ba6df0d5602d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OfficeBuildingMember_019c9ac0-6b17-7f32-af94-e298d9a30897" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OfficeBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:to="loc_srt_OfficeBuildingMember_019c9ac0-6b17-7f32-af94-e298d9a30897" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_HotelMember_019c9ac0-6b17-7ffc-886e-38ca7d83db46" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_HotelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:to="loc_srt_HotelMember_019c9ac0-6b17-7ffc-886e-38ca7d83db46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RetailSiteMember_019c9ac0-6b17-7565-a2d1-49f839d65ff1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RetailSiteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:to="loc_srt_RetailSiteMember_019c9ac0-6b17-7565-a2d1-49f839d65ff1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OtherPropertyMember_019c9ac0-6b17-7e30-b810-a3a046d85e29" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OtherPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019c9ac0-6b17-71e8-9cc2-0caf3954a2db" xlink:to="loc_srt_OtherPropertyMember_019c9ac0-6b17-7e30-b810-a3a046d85e29" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c9ac0-6b17-74b5-9fdf-b2eee2d02a26" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019c9ac0-6b17-70bd-bef6-bb16be6e7297" xlink:to="loc_srt_StatementGeographicalAxis_019c9ac0-6b17-74b5-9fdf-b2eee2d02a26" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c9ac0-6b17-74b5-9fdf-b2eee2d02a26_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c9ac0-6b17-74b5-9fdf-b2eee2d02a26" xlink:to="loc_srt_SegmentGeographicalDomain_019c9ac0-6b17-74b5-9fdf-b2eee2d02a26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c9ac0-6b17-751d-94ae-f5a7bd208e84" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c9ac0-6b17-74b5-9fdf-b2eee2d02a26" xlink:to="loc_srt_SegmentGeographicalDomain_019c9ac0-6b17-751d-94ae-f5a7bd208e84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c9ac0-6b17-751d-94ae-f5a7bd208e84" xlink:to="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USEastNorthCentralMember_019c9ac0-6b17-73ef-8fe1-7bce15070167" xlink:href="apo-20260331.xsd#apo_USEastNorthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USEastNorthCentralMember_019c9ac0-6b17-73ef-8fe1-7bce15070167" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USEastSouthCentralMember_019c9ac0-6b17-7e5a-9dea-cc96a0af5e51" xlink:href="apo-20260331.xsd#apo_USEastSouthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USEastSouthCentralMember_019c9ac0-6b17-7e5a-9dea-cc96a0af5e51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USMiddleAtlanticMember_019c9ac0-6b17-7660-9871-368d832452a5" xlink:href="apo-20260331.xsd#apo_USMiddleAtlanticMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USMiddleAtlanticMember_019c9ac0-6b17-7660-9871-368d832452a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USMountainMember_019c9ac0-6b17-72ad-9812-300fd22ac16c" xlink:href="apo-20260331.xsd#apo_USMountainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USMountainMember_019c9ac0-6b17-72ad-9812-300fd22ac16c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NewEnglandMember_019c9ac0-6b17-7d19-8660-52c882c02f82" xlink:href="apo-20260331.xsd#apo_NewEnglandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_NewEnglandMember_019c9ac0-6b17-7d19-8660-52c882c02f82" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USPacificMember_019c9ac0-6b17-73af-b573-8a0eac1bde9e" xlink:href="apo-20260331.xsd#apo_USPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USPacificMember_019c9ac0-6b17-73af-b573-8a0eac1bde9e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USSouthAtlanticMember_019c9ac0-6b17-73f9-b17b-29c8b40745ad" xlink:href="apo-20260331.xsd#apo_USSouthAtlanticMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USSouthAtlanticMember_019c9ac0-6b17-73f9-b17b-29c8b40745ad" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USWestNorthCentralMember_019c9ac0-6b17-7367-98d4-8bfe28230cec" xlink:href="apo-20260331.xsd#apo_USWestNorthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USWestNorthCentralMember_019c9ac0-6b17-7367-98d4-8bfe28230cec" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_USWestSouthCentralMember_019c9ac0-6b17-7061-9551-b06326cbb346" xlink:href="apo-20260331.xsd#apo_USWestSouthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_USWestSouthCentralMember_019c9ac0-6b17-7061-9551-b06326cbb346" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_019c9ac0-6b17-7199-9484-7578c29dcfbb" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_stpr_CA_019c9ac0-6b17-7199-9484-7578c29dcfbb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_TX_019c9ac0-6b17-74c8-bc02-6e25f9692ceb" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_TX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_stpr_TX_019c9ac0-6b17-74c8-bc02-6e25f9692ceb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_FL_019c9ac0-6b17-78a7-9874-5b038cdc9e2e" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_FL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_stpr_FL_019c9ac0-6b17-78a7-9874-5b038cdc9e2e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherUSStatesMember_019c9ac0-6b17-740c-b81b-8d0495bf9c76" xlink:href="apo-20260331.xsd#apo_OtherUSStatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019c9ac0-6b17-7597-a383-d487f4e2a891" xlink:to="loc_apo_OtherUSStatesMember_019c9ac0-6b17-740c-b81b-8d0495bf9c76" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_019c9ac0-6b17-7b08-a10e-261a3806e16f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c9ac0-6b17-751d-94ae-f5a7bd208e84" xlink:to="loc_us-gaap_NonUsMember_019c9ac0-6b17-7b08-a10e-261a3806e16f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019c9ac0-6b17-73c1-9e03-8651a9e32f80" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonUsMember_019c9ac0-6b17-7b08-a10e-261a3806e16f" xlink:to="loc_country_GB_019c9ac0-6b17-73c1-9e03-8651a9e32f80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InternationalOtherMember_019c9ac0-6b17-73c6-a15e-ce4950c5a0c2" xlink:href="apo-20260331.xsd#apo_InternationalOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonUsMember_019c9ac0-6b17-7b08-a10e-261a3806e16f" xlink:to="loc_apo_InternationalOtherMember_019c9ac0-6b17-73c6-a15e-ce4950c5a0c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b17-70de-b8d9-b425d7a54144" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019c9ac0-6b17-70bd-bef6-bb16be6e7297" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b17-70de-b8d9-b425d7a54144" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b17-70de-b8d9-b425d7a54144_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b17-70de-b8d9-b425d7a54144" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b17-70de-b8d9-b425d7a54144_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b17-73fe-a94c-a936050fa4cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6b17-70de-b8d9-b425d7a54144" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b17-73fe-a94c-a936050fa4cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialLoanMember_019c9ac0-6b17-743a-96d4-895ee45356d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b17-73fe-a94c-a936050fa4cd" xlink:to="loc_us-gaap_CommercialLoanMember_019c9ac0-6b17-743a-96d4-895ee45356d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_019c9ac0-6b17-799a-a1e9-63aa3c397b74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6b17-73fe-a94c-a936050fa4cd" xlink:to="loc_us-gaap_ResidentialMortgageMember_019c9ac0-6b17-799a-a1e9-63aa3c397b74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019c9ac0-6b17-7a17-b3f1-d3ceaf41e50c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019c9ac0-6b17-7eca-b5ed-0bce332859af" xlink:to="loc_us-gaap_Investments_019c9ac0-6b17-7a17-b3f1-d3ceaf41e50c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentsPercentageOfTotal_019c9ac0-6b17-7db8-a6ec-99bf5741a550" xlink:href="apo-20260331.xsd#apo_InvestmentsPercentageOfTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019c9ac0-6b17-7eca-b5ed-0bce332859af" xlink:to="loc_apo_InvestmentsPercentageOfTotal_019c9ac0-6b17-7db8-a6ec-99bf5741a550" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofInvestmentFundsIncludingRelatedPartiesandConsolidatedVIEsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofInvestmentFundsIncludingRelatedPartiesandConsolidatedVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofInvestmentFundsIncludingRelatedPartiesandConsolidatedVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b17-7385-b484-9fc1e3e3887a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b17-7ad6-a2b8-6d4613f74ff7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b17-7385-b484-9fc1e3e3887a" xlink:to="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b17-7ad6-a2b8-6d4613f74ff7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019c9ac0-6b17-7940-b5ee-79728e033e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b17-7ad6-a2b8-6d4613f74ff7" xlink:to="loc_us-gaap_InvestmentTypeAxis_019c9ac0-6b17-7940-b5ee-79728e033e8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7940-b5ee-79728e033e8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019c9ac0-6b17-7940-b5ee-79728e033e8d" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7940-b5ee-79728e033e8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7492-b03a-ff253d8e9e2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019c9ac0-6b17-7940-b5ee-79728e033e8d" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7492-b03a-ff253d8e9e2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OriginationPlatformsMember_019c9ac0-6b17-7345-82f0-1b7b6e2361b4" xlink:href="apo-20260331.xsd#apo_OriginationPlatformsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7492-b03a-ff253d8e9e2a" xlink:to="loc_apo_OriginationPlatformsMember_019c9ac0-6b17-7345-82f0-1b7b6e2361b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesPlatformsMember_019c9ac0-6b17-7a94-bc93-6b4d8f91faff" xlink:href="apo-20260331.xsd#apo_RetirementServicesPlatformsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7492-b03a-ff253d8e9e2a" xlink:to="loc_apo_RetirementServicesPlatformsMember_019c9ac0-6b17-7a94-bc93-6b4d8f91faff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EquityFundInvestmentsMember_019c9ac0-6b17-7ac6-b7e7-19fdc137ff30" xlink:href="apo-20260331.xsd#apo_EquityFundInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7492-b03a-ff253d8e9e2a" xlink:to="loc_apo_EquityFundInvestmentsMember_019c9ac0-6b17-7ac6-b7e7-19fdc137ff30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_CreditFundInvestmentsMember_019c9ac0-6b17-7368-9eb0-40681d22348e" xlink:href="apo-20260331.xsd#apo_CreditFundInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7492-b03a-ff253d8e9e2a" xlink:to="loc_apo_CreditFundInvestmentsMember_019c9ac0-6b17-7368-9eb0-40681d22348e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherInvestmentMember_019c9ac0-6b17-7864-97eb-f2582a1a88fe" xlink:href="apo-20260331.xsd#apo_OtherInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019c9ac0-6b17-7492-b03a-ff253d8e9e2a" xlink:to="loc_apo_OtherInvestmentMember_019c9ac0-6b17-7864-97eb-f2582a1a88fe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b17-7048-8b51-1eff3d5c92c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b17-7ad6-a2b8-6d4613f74ff7" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b17-7048-8b51-1eff3d5c92c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b17-7048-8b51-1eff3d5c92c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b17-7048-8b51-1eff3d5c92c8" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b17-7048-8b51-1eff3d5c92c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b17-74cc-ba8a-af8174441b10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6b17-7048-8b51-1eff3d5c92c8" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b17-74cc-ba8a-af8174441b10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b17-7ade-8884-f84b35e0eceb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b17-74cc-ba8a-af8174441b10" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6b17-7ade-8884-f84b35e0eceb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6b17-77a5-a0ac-d80bdb65a812" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6b17-74cc-ba8a-af8174441b10" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6b17-77a5-a0ac-d80bdb65a812" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b17-7479-b3ab-fcd32ba54da3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6b17-7ad6-a2b8-6d4613f74ff7" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b17-7479-b3ab-fcd32ba54da3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b17-7479-b3ab-fcd32ba54da3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b17-7479-b3ab-fcd32ba54da3" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b17-7479-b3ab-fcd32ba54da3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b17-7f7e-baf6-e2031164cb0f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6b17-7479-b3ab-fcd32ba54da3" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b17-7f7e-baf6-e2031164cb0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b17-7fdc-a962-c7dcf864a0ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6b17-7f7e-baf6-e2031164cb0f" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6b17-7fdc-a962-c7dcf864a0ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFunds_019c9ac0-6b17-76e9-90e2-ad0ad989afac" xlink:href="apo-20260331.xsd#apo_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b17-7385-b484-9fc1e3e3887a" xlink:to="loc_apo_InvestmentFunds_019c9ac0-6b17-76e9-90e2-ad0ad989afac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsIncludingRelatedPartyAndVariableInterestEntities_019c9ac0-6b17-7393-944c-27e1f893030f" xlink:href="apo-20260331.xsd#apo_InvestmentFundsIncludingRelatedPartyAndVariableInterestEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b17-7385-b484-9fc1e3e3887a" xlink:to="loc_apo_InvestmentFundsIncludingRelatedPartyAndVariableInterestEntities_019c9ac0-6b17-7393-944c-27e1f893030f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsPercentOfTotal_019c9ac0-6b17-72b7-9174-2fa42c0c6b1f" xlink:href="apo-20260331.xsd#apo_InvestmentFundsPercentOfTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6b17-7385-b484-9fc1e3e3887a" xlink:to="loc_apo_InvestmentFundsPercentOfTotal_019c9ac0-6b17-72b7-9174-2fa42c0c6b1f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/InvestmentsScheduleofConcentrationofRiskbyRiskFactorDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#InvestmentsScheduleofConcentrationofRiskbyRiskFactorDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/InvestmentsScheduleofConcentrationofRiskbyRiskFactorDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_019c9ac0-6b17-722a-8cc9-d670b0d54ca8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019c9ac0-6b17-722a-8cc9-d670b0d54ca8" xlink:to="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9ac0-6b17-7db5-967c-b35ae50b2e97" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9ac0-6b17-7db5-967c-b35ae50b2e97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-7db5-967c-b35ae50b2e97_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9ac0-6b17-7db5-967c-b35ae50b2e97" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-7db5-967c-b35ae50b2e97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9ac0-6b17-7db5-967c-b35ae50b2e97" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_APGrangeHoldingsLLCMember_019c9ac0-6b17-729b-91ab-9904fc91acba" xlink:href="apo-20260331.xsd#apo_APGrangeHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_APGrangeHoldingsLLCMember_019c9ac0-6b17-729b-91ab-9904fc91acba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtlasSecuritizedProductsHoldingsLPMember_019c9ac0-6b17-7b5c-b7bd-ab9845247a15" xlink:href="apo-20260331.xsd#apo_AtlasSecuritizedProductsHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_AtlasSecuritizedProductsHoldingsLPMember_019c9ac0-6b17-7b5c-b7bd-ab9845247a15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FoxHedgeL.PMember_019c9ac0-6b17-77d7-8ccc-0da2ee490568" xlink:href="apo-20260331.xsd#apo_FoxHedgeL.PMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_FoxHedgeL.PMember_019c9ac0-6b17-77d7-8ccc-0da2ee490568" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AthoraHoldingLtd.Member_019dbcff-99eb-7fcc-86f1-15518aef7dc3" xlink:href="apo-20260331.xsd#apo_AthoraHoldingLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_AthoraHoldingLtd.Member_019dbcff-99eb-7fcc-86f1-15518aef7dc3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ApolloMultiAssetPrimeSecurities2LLCMember_019c9ac0-6b17-77a5-9889-24c83dfd0aeb" xlink:href="apo-20260331.xsd#apo_ApolloMultiAssetPrimeSecurities2LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_ApolloMultiAssetPrimeSecurities2LLCMember_019c9ac0-6b17-77a5-9889-24c83dfd0aeb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AMAPS3LLCMember_019dbcfe-7faf-772f-b0fe-efd9d1eae63e" xlink:href="apo-20260331.xsd#apo_AMAPS3LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_AMAPS3LLCMember_019dbcfe-7faf-772f-b0fe-efd9d1eae63e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_APAlkaiosLuxembourgS.a.r.l.Member_019c9ac0-6b17-7de2-8218-c295fafe37b0" xlink:href="apo-20260331.xsd#apo_APAlkaiosLuxembourgS.a.r.l.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_APAlkaiosLuxembourgS.a.r.l.Member_019c9ac0-6b17-7de2-8218-c295fafe37b0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AMAPSILLCMember_019c9ac0-6b17-7f34-b3ce-a21a7bc52f71" xlink:href="apo-20260331.xsd#apo_AMAPSILLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_AMAPSILLCMember_019c9ac0-6b17-7f34-b3ce-a21a7bc52f71" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SVFIIFincoCaymanL.PMember_019dbd01-11ae-7a44-b1a7-465aaba73921" xlink:href="apo-20260331.xsd#apo_SVFIIFincoCaymanL.PMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9ac0-6b17-770b-bfa5-8aee0c59054f" xlink:to="loc_apo_SVFIIFincoCaymanL.PMember_019dbd01-11ae-7a44-b1a7-465aaba73921" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c9ac0-6b17-7f65-b8f6-f88a5c8ee2dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c9ac0-6b17-7f65-b8f6-f88a5c8ee2dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c9ac0-6b17-7f65-b8f6-f88a5c8ee2dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c9ac0-6b17-7f65-b8f6-f88a5c8ee2dc" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c9ac0-6b17-7f65-b8f6-f88a5c8ee2dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c9ac0-6b17-739d-8090-cae25929b4ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c9ac0-6b17-7f65-b8f6-f88a5c8ee2dc" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c9ac0-6b17-739d-8090-cae25929b4ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityTotalMember_019c9ac0-6b17-7943-8e21-901606043626" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityTotalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c9ac0-6b17-739d-8090-cae25929b4ba" xlink:to="loc_us-gaap_StockholdersEquityTotalMember_019c9ac0-6b17-7943-8e21-901606043626" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019c9ac0-6b17-70b7-9acb-634585dfc562" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019c9ac0-6b17-70b7-9acb-634585dfc562" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c9ac0-6b17-70b7-9acb-634585dfc562_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c9ac0-6b17-70b7-9acb-634585dfc562" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c9ac0-6b17-70b7-9acb-634585dfc562_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c9ac0-6b17-75bf-ac15-07416de3b1ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c9ac0-6b17-70b7-9acb-634585dfc562" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c9ac0-6b17-75bf-ac15-07416de3b1ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentConcentrationRiskMember_019c9ac0-6b17-772c-86bc-9183234a9951" xlink:href="apo-20260331.xsd#apo_InvestmentConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019c9ac0-6b17-75bf-ac15-07416de3b1ef" xlink:to="loc_apo_InvestmentConcentrationRiskMember_019c9ac0-6b17-772c-86bc-9183234a9951" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019de1de-72c6-7597-aef7-af8cd30ee70f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019de1de-72c6-7597-aef7-af8cd30ee70f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019de1de-72c6-7597-aef7-af8cd30ee70f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019de1de-72c6-7597-aef7-af8cd30ee70f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019de1de-72c6-7597-aef7-af8cd30ee70f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019de1de-72c6-7b3a-a413-123bf61d86a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019de1de-72c6-7597-aef7-af8cd30ee70f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019de1de-72c6-7b3a-a413-123bf61d86a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019de1de-9f69-7f62-8fe6-ff41987a6303" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019de1de-72c6-7b3a-a413-123bf61d86a4" xlink:to="loc_us-gaap_SubsequentEventMember_019de1de-9f69-7f62-8fe6-ff41987a6303" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019de3ca-5e9f-7430-9d4c-99e537b76248" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:to="loc_srt_StatementScenarioAxis_019de3ca-5e9f-7430-9d4c-99e537b76248" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019de3ca-5e9f-7430-9d4c-99e537b76248_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019de3ca-5e9f-7430-9d4c-99e537b76248" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019de3ca-5e9f-7430-9d4c-99e537b76248_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019de3ca-5e9f-7f2e-8fd9-03599c209e5e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019de3ca-5e9f-7430-9d4c-99e537b76248" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019de3ca-5e9f-7f2e-8fd9-03599c209e5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019de3ca-78fb-7d06-bea0-9a258561a0ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019de3ca-5e9f-7f2e-8fd9-03599c209e5e" xlink:to="loc_srt_ScenarioForecastMember_019de3ca-78fb-7d06-bea0-9a258561a0ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019de3ca-9ce6-7767-b57e-909ecd1bf7ad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c9ac0-6b17-76b7-846a-171b85fec613" xlink:to="loc_dei_LegalEntityAxis_019de3ca-9ce6-7767-b57e-909ecd1bf7ad" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019de3ca-9ce6-7767-b57e-909ecd1bf7ad_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019de3ca-9ce6-7767-b57e-909ecd1bf7ad" xlink:to="loc_dei_EntityDomain_019de3ca-9ce6-7767-b57e-909ecd1bf7ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019de3ca-9ce6-7a49-8749-5f6449911058" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019de3ca-9ce6-7767-b57e-909ecd1bf7ad" xlink:to="loc_dei_EntityDomain_019de3ca-9ce6-7a49-8749-5f6449911058" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneMember_019de3ca-bd0b-7f9f-9d3d-cf93c2427f4d" xlink:href="apo-20260331.xsd#apo_AtheneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019de3ca-9ce6-7a49-8749-5f6449911058" xlink:to="loc_apo_AtheneMember_019de3ca-bd0b-7f9f-9d3d-cf93c2427f4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentConcentrationRiskAmount_019c9ac0-6b17-739e-8e6e-9e33e55ca8a6" xlink:href="apo-20260331.xsd#apo_InvestmentConcentrationRiskAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019c9ac0-6b17-722a-8cc9-d670b0d54ca8" xlink:to="loc_apo_InvestmentConcentrationRiskAmount_019c9ac0-6b17-739e-8e6e-9e33e55ca8a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019de3ca-236e-777e-8171-6015b3bc8689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019c9ac0-6b17-722a-8cc9-d670b0d54ca8" xlink:to="loc_us-gaap_GainLossOnInvestments_019de3ca-236e-777e-8171-6015b3bc8689" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DerivativesScheduleofNotionalAmountandFairValueofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DerivativesScheduleofNotionalAmountandFairValueofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DerivativesScheduleofNotionalAmountandFairValueofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7f34-8ef1-d420ef276e21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7f34-8ef1-d420ef276e21" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7b88-96d5-619cda1164cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7f34-8ef1-d420ef276e21" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7b88-96d5-619cda1164cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b88-96d5-619cda1164cf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7b88-96d5-619cda1164cf" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b88-96d5-619cda1164cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7b88-96d5-619cda1164cf" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-74e6-8761-eea2e3f13a48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-74e6-8761-eea2e3f13a48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-7f92-ae40-f2dbc1d4b4c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-7f92-ae40-f2dbc1d4b4c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ForeignCurrencyInterestRateSwapMember_019c9ac0-6be0-7a76-a0dc-fd35dac6aab9" xlink:href="apo-20260331.xsd#apo_ForeignCurrencyInterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_apo_ForeignCurrencyInterestRateSwapMember_019c9ac0-6be0-7a76-a0dc-fd35dac6aab9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ForwardsOnNetInvestmentsMember_019c9ac0-6be0-79a0-a081-e2d405caec3a" xlink:href="apo-20260331.xsd#apo_ForwardsOnNetInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_apo_ForwardsOnNetInvestmentsMember_019c9ac0-6be0-79a0-a081-e2d405caec3a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-70a7-ab64-fdcd55f7d755" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-70a7-ab64-fdcd55f7d755" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019c9ac0-6be0-7ae8-992d-eed91e6db524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_us-gaap_StockOptionMember_019c9ac0-6be0-7ae8-992d-eed91e6db524" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeFutureMember_019c9ac0-6be0-7fe6-a3f1-20b82f06d08a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeFutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_us-gaap_ForeignExchangeFutureMember_019c9ac0-6be0-7fe6-a3f1-20b82f06d08a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherSwapsMember_019c9ac0-6be0-78ce-a0cc-fee574e6e74d" xlink:href="apo-20260331.xsd#apo_OtherSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_apo_OtherSwapsMember_019c9ac0-6be0-78ce-a0cc-fee574e6e74d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EmbeddedDerivativesFinancialInstrumentsFundsWithheldIncludingRelatedPartyMember_019c9ac0-6be0-7cbf-8713-85597afd9e1f" xlink:href="apo-20260331.xsd#apo_EmbeddedDerivativesFinancialInstrumentsFundsWithheldIncludingRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_apo_EmbeddedDerivativesFinancialInstrumentsFundsWithheldIncludingRelatedPartyMember_019c9ac0-6be0-7cbf-8713-85597afd9e1f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EmbeddedDerivativesFinancialInstrumentsInterestSensitiveContractLiabilitiesMember_019c9ac0-6be0-70fd-834d-2ee357120e68" xlink:href="apo-20260331.xsd#apo_EmbeddedDerivativesFinancialInstrumentsInterestSensitiveContractLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7b1d-a050-343a87b661b3" xlink:to="loc_apo_EmbeddedDerivativesFinancialInstrumentsInterestSensitiveContractLiabilitiesMember_019c9ac0-6be0-70fd-834d-2ee357120e68" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7061-896a-e7b6f612b22d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7f34-8ef1-d420ef276e21" xlink:to="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7061-896a-e7b6f612b22d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7061-896a-e7b6f612b22d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7061-896a-e7b6f612b22d" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7061-896a-e7b6f612b22d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7d26-b297-be84582dd7a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7061-896a-e7b6f612b22d" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7d26-b297-be84582dd7a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c9ac0-6be0-7a15-b147-659a59f9ff2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7d26-b297-be84582dd7a3" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c9ac0-6be0-7a15-b147-659a59f9ff2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019c9ac0-6be0-7747-9355-fa67d94c4f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7d26-b297-be84582dd7a3" xlink:to="loc_us-gaap_NondesignatedMember_019c9ac0-6be0-7747-9355-fa67d94c4f8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c9ac0-6be0-7637-a7f7-2caf8e1b98ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c9ac0-6be0-7637-a7f7-2caf8e1b98ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019c9ac0-6be0-72bb-a0f5-d1cd9f29d695" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019c9ac0-6be0-72bb-a0f5-d1cd9f29d695" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019c9ac0-6be0-7c01-975f-f47034d844bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019c9ac0-6be0-7c01-975f-f47034d844bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019c9ac0-6be0-7b69-9bcf-f3e4465c383c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeAssets_019c9ac0-6be0-7b69-9bcf-f3e4465c383c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DerivativeAssetNet_019c9ac0-6be0-7bb9-bcd1-70e58803066a" xlink:href="apo-20260331.xsd#apo_DerivativeAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_apo_DerivativeAssetNet_019c9ac0-6be0-7bb9-bcd1-70e58803066a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019c9ac0-6be0-7753-b28c-80695d49e10f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019c9ac0-6be0-7753-b28c-80695d49e10f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019c9ac0-6be0-7f1e-87db-cc1b7d1b80a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019c9ac0-6be0-7f1e-87db-cc1b7d1b80a3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019c9ac0-6be0-74d8-ab45-2f7646f2d401" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeLiabilities_019c9ac0-6be0-74d8-ab45-2f7646f2d401" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019c9ac0-6be0-7e52-a17b-bde7fa0c1be6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-7065-aee0-eff1f8093462" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019c9ac0-6be0-7e52-a17b-bde7fa0c1be6" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DerivativesNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DerivativesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DerivativesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-77c9-8d52-c7da2c941681" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-77c9-8d52-c7da2c941681" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-77c9-8d52-c7da2c941681_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-77c9-8d52-c7da2c941681" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-77c9-8d52-c7da2c941681_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7e6c-aec4-195fd1b6b8d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-77c9-8d52-c7da2c941681" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7e6c-aec4-195fd1b6b8d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-7cee-abe5-a2ddd98265da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7e6c-aec4-195fd1b6b8d5" xlink:to="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-7cee-abe5-a2ddd98265da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-78c4-afdf-21dfb57c1f85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7e6c-aec4-195fd1b6b8d5" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-78c4-afdf-21dfb57c1f85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7e2b-9745-ec9dff846633" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7e6c-aec4-195fd1b6b8d5" xlink:to="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7e2b-9745-ec9dff846633" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6be0-78f7-a04f-2653470ca82f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6be0-78f7-a04f-2653470ca82f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6be0-78f7-a04f-2653470ca82f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6be0-78f7-a04f-2653470ca82f" xlink:to="loc_dei_EntityDomain_019c9ac0-6be0-78f7-a04f-2653470ca82f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6be0-7c45-bc84-c0c8578fbf0a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6be0-78f7-a04f-2653470ca82f" xlink:to="loc_dei_EntityDomain_019c9ac0-6be0-7c45-bc84-c0c8578fbf0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6be0-7bc2-9018-c8bb5dd60190" xlink:href="apo-20260331.xsd#apo_AtheneHoldingLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6be0-7c45-bc84-c0c8578fbf0a" xlink:to="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6be0-7bc2-9018-c8bb5dd60190" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7772-9301-9be72162f15f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7772-9301-9be72162f15f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7772-9301-9be72162f15f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7772-9301-9be72162f15f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7772-9301-9be72162f15f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7a9c-a026-4deccdea87a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7772-9301-9be72162f15f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7a9c-a026-4deccdea87a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019c9ac0-6be0-7b75-b325-3829476dc7d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7a9c-a026-4deccdea87a5" xlink:to="loc_us-gaap_CashFlowHedgingMember_019c9ac0-6be0-7b75-b325-3829476dc7d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-7ed9-adf1-df17287fa4bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7a9c-a026-4deccdea87a5" xlink:to="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-7ed9-adf1-df17287fa4bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019c9ac0-6be0-7711-9858-ee045efc0aa2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7a9c-a026-4deccdea87a5" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019c9ac0-6be0-7711-9858-ee045efc0aa2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7975-a5b9-fa28325ac52e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7975-a5b9-fa28325ac52e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7975-a5b9-fa28325ac52e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7975-a5b9-fa28325ac52e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7975-a5b9-fa28325ac52e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-712c-bf07-1df3dd6e9a88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7975-a5b9-fa28325ac52e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-712c-bf07-1df3dd6e9a88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6be0-725a-b06e-8cc00711c661" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-712c-bf07-1df3dd6e9a88" xlink:to="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6be0-725a-b06e-8cc00711c661" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesByContractTypeAxis_019c9ac0-6be0-76ae-b758-272c28f27187" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDerivativesByContractTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:to="loc_us-gaap_CreditDerivativesByContractTypeAxis_019c9ac0-6be0-76ae-b758-272c28f27187" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesContractTypeDomain_019c9ac0-6be0-76ae-b758-272c28f27187_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDerivativesContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditDerivativesByContractTypeAxis_019c9ac0-6be0-76ae-b758-272c28f27187" xlink:to="loc_us-gaap_CreditDerivativesContractTypeDomain_019c9ac0-6be0-76ae-b758-272c28f27187_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesContractTypeDomain_019c9ac0-6be0-7f24-8289-64939658b350" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDerivativesContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditDerivativesByContractTypeAxis_019c9ac0-6be0-76ae-b758-272c28f27187" xlink:to="loc_us-gaap_CreditDerivativesContractTypeDomain_019c9ac0-6be0-7f24-8289-64939658b350" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_019c9ac0-6be0-77d1-ab74-8735b018dd83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditDerivativesContractTypeDomain_019c9ac0-6be0-7f24-8289-64939658b350" xlink:to="loc_us-gaap_CreditDefaultSwapMember_019c9ac0-6be0-77d1-ab74-8735b018dd83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7ba9-81b2-9c77e787f9ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7549-a1d1-27b6fbd2d1cd" xlink:to="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7ba9-81b2-9c77e787f9ad" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7ba9-81b2-9c77e787f9ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7ba9-81b2-9c77e787f9ad" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7ba9-81b2-9c77e787f9ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7dfb-ad19-8ee77e8409c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c9ac0-6be0-7ba9-81b2-9c77e787f9ad" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7dfb-ad19-8ee77e8409c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c9ac0-6be0-7044-b952-c578b5a1e957" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c9ac0-6be0-7dfb-ad19-8ee77e8409c2" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c9ac0-6be0-7044-b952-c578b5a1e957" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent_019c9ac0-6be0-75b8-8e89-1ac4642ed93d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent_019c9ac0-6be0-75b8-8e89-1ac4642ed93d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_019c9ac0-6be0-78e1-a1cf-17b0888b464c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_019c9ac0-6be0-78e1-a1cf-17b0888b464c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019c9ac0-6be0-7bbb-9a1d-af1fb1a15123" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019c9ac0-6be0-7bbb-9a1d-af1fb1a15123" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedge_019c9ac0-6be0-736e-8019-298532db0ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedAssetFairValueHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_HedgedAssetFairValueHedge_019c9ac0-6be0-736e-8019-298532db0ffc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DerivativeGainLossOnDerivativeNetting_019c9ac0-6be0-7406-a0a8-bbaf8958cb4b" xlink:href="apo-20260331.xsd#apo_DerivativeGainLossOnDerivativeNetting"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_apo_DerivativeGainLossOnDerivativeNetting_019c9ac0-6be0-7406-a0a8-bbaf8958cb4b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_019c9ac0-6be0-7b4d-9848-8663646016dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_019c9ac0-6be0-7b4d-9848-8663646016dd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019c9ac0-6be0-737d-84fd-2fe98796894a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019c9ac0-6be0-737d-84fd-2fe98796894a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditRiskDerivativeAssetsAtFairValue_019c9ac0-6be0-72a6-882e-0b85cce55a93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditRiskDerivativeAssetsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_CreditRiskDerivativeAssetsAtFairValue_019c9ac0-6be0-72a6-882e-0b85cce55a93" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditRiskDerivativeLiabilitiesAtFairValue_019c9ac0-6be0-7ab9-a83f-92590c27c2e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditRiskDerivativeLiabilitiesAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_CreditRiskDerivativeLiabilitiesAtFairValue_019c9ac0-6be0-7ab9-a83f-92590c27c2e3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativeMaximumExposureUndiscounted_019c9ac0-6be0-7344-bc55-443c013305f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDerivativeMaximumExposureUndiscounted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7a17-a0a4-9169993939a3" xlink:to="loc_us-gaap_CreditDerivativeMaximumExposureUndiscounted_019c9ac0-6be0-7344-bc55-443c013305f9" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DerivativesScheduleofCarryingAmountandtheCumulativeFairValueHedgingAdjustmentsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DerivativesScheduleofCarryingAmountandtheCumulativeFairValueHedgingAdjustmentsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DerivativesScheduleofCarryingAmountandtheCumulativeFairValueHedgingAdjustmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7547-9b59-fb83450461d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7486-aa43-ebd1146c3a37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7547-9b59-fb83450461d2" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7486-aa43-ebd1146c3a37" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7597-8442-a63996c0d647" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7486-aa43-ebd1146c3a37" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7597-8442-a63996c0d647" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7597-8442-a63996c0d647_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7597-8442-a63996c0d647" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7597-8442-a63996c0d647_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-795f-b809-a3ba74ea3806" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7597-8442-a63996c0d647" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-795f-b809-a3ba74ea3806" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019c9ac0-6be0-7d2b-a68c-ff5d802eb462" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-795f-b809-a3ba74ea3806" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019c9ac0-6be0-7d2b-a68c-ff5d802eb462" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-7cde-bec8-dd810ae65b48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-795f-b809-a3ba74ea3806" xlink:to="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-7cde-bec8-dd810ae65b48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7700-a32a-8f43bd040659" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7486-aa43-ebd1146c3a37" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7700-a32a-8f43bd040659" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7700-a32a-8f43bd040659_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7700-a32a-8f43bd040659" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7700-a32a-8f43bd040659_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-70bf-8096-f14ad0e87db0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7700-a32a-8f43bd040659" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-70bf-8096-f14ad0e87db0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-73a1-a697-0461dd69f6b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-70bf-8096-f14ad0e87db0" xlink:to="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-73a1-a697-0461dd69f6b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7dcf-93ea-a27ddec8e039" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7486-aa43-ebd1146c3a37" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7dcf-93ea-a27ddec8e039" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7dcf-93ea-a27ddec8e039_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7dcf-93ea-a27ddec8e039" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7dcf-93ea-a27ddec8e039_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-726b-81b9-e28acc151c43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7dcf-93ea-a27ddec8e039" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-726b-81b9-e28acc151c43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestSensitiveContractLiabilitiesMember_019c9ac0-6be0-733e-9b5c-6f75d4f8c2c6" xlink:href="apo-20260331.xsd#apo_InterestSensitiveContractLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-726b-81b9-e28acc151c43" xlink:to="loc_apo_InterestSensitiveContractLiabilitiesMember_019c9ac0-6be0-733e-9b5c-6f75d4f8c2c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedLiabilityFairValueHedge_019c9ac0-6be0-71d6-9d3c-ec3fe3cc6726" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedLiabilityFairValueHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7547-9b59-fb83450461d2" xlink:to="loc_us-gaap_HedgedLiabilityFairValueHedge_019c9ac0-6be0-71d6-9d3c-ec3fe3cc6726" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease_019c9ac0-6be0-752e-bbd0-878dd3825436" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-7547-9b59-fb83450461d2" xlink:to="loc_us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease_019c9ac0-6be0-752e-bbd0-878dd3825436" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DerivativesScheduleofGainsLossesRelatedtoDerivativesandRelatedHedgedItemsinFairValueHedgeRelationshipsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DerivativesScheduleofGainsLossesRelatedtoDerivativesandRelatedHedgedItemsinFairValueHedgeRelationshipsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DerivativesScheduleofGainsLossesRelatedtoDerivativesandRelatedHedgedItemsinFairValueHedgeRelationshipsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-78f8-8f89-0c285ea35314" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-78cd-b805-31f004b470b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-78f8-8f89-0c285ea35314" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-78cd-b805-31f004b470b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7a33-b875-9c52071a4fbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-78cd-b805-31f004b470b4" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7a33-b875-9c52071a4fbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7a33-b875-9c52071a4fbc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7a33-b875-9c52071a4fbc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7a33-b875-9c52071a4fbc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7f99-9e74-0a49bd8b06f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7a33-b875-9c52071a4fbc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7f99-9e74-0a49bd8b06f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-727f-bcf3-3ff0877f2d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7f99-9e74-0a49bd8b06f7" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-727f-bcf3-3ff0877f2d2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7aff-850f-149096a9dd91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7f99-9e74-0a49bd8b06f7" xlink:to="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7aff-850f-149096a9dd91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019c9ac0-6be0-7a01-8f39-7033886cf846" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7f99-9e74-0a49bd8b06f7" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019c9ac0-6be0-7a01-8f39-7033886cf846" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-707c-94d1-c63f706a70e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7f99-9e74-0a49bd8b06f7" xlink:to="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-707c-94d1-c63f706a70e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ForeignCurrencyInterestRateSwapInterestSensitiveContractBenefitsMember_019c9ac0-6be0-7ba0-b222-ed06afce366b" xlink:href="apo-20260331.xsd#apo_ForeignCurrencyInterestRateSwapInterestSensitiveContractBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7f99-9e74-0a49bd8b06f7" xlink:to="loc_apo_ForeignCurrencyInterestRateSwapInterestSensitiveContractBenefitsMember_019c9ac0-6be0-7ba0-b222-ed06afce366b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7060-9bb2-0da7b6152d23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-78cd-b805-31f004b470b4" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7060-9bb2-0da7b6152d23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7060-9bb2-0da7b6152d23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7060-9bb2-0da7b6152d23" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7060-9bb2-0da7b6152d23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7f79-91f6-094bb5508ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7060-9bb2-0da7b6152d23" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7f79-91f6-094bb5508ee3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-70cf-96d1-3abd423960dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7f79-91f6-094bb5508ee3" xlink:to="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-70cf-96d1-3abd423960dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019c9ac0-6be0-73b7-b2fe-3e89ef221d01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-78f8-8f89-0c285ea35314" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019c9ac0-6be0-73b7-b2fe-3e89ef221d01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019c9ac0-6be0-7748-9033-c64cb3e86898" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-78f8-8f89-0c285ea35314" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019c9ac0-6be0-7748-9033-c64cb3e86898" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_019c9ac0-6be0-78bb-bd6e-f54c91b840a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-78f8-8f89-0c285ea35314" xlink:to="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_019c9ac0-6be0-78bb-bd6e-f54c91b840a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax_019c9ac0-6be0-781e-860a-0e13e4154faf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-78f8-8f89-0c285ea35314" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax_019c9ac0-6be0-781e-860a-0e13e4154faf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeExcludedComponentGainLossRecognizedInEarnings_019c9ac0-6be0-7680-93fd-5a515a3d543c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeExcludedComponentGainLossRecognizedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-78f8-8f89-0c285ea35314" xlink:to="loc_us-gaap_DerivativeExcludedComponentGainLossRecognizedInEarnings_019c9ac0-6be0-7680-93fd-5a515a3d543c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DerivativesScheduleofGainsLossesExcludedFromAssessmentofHedgeEffectivenessRecognizedinOCIDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DerivativesScheduleofGainsLossesExcludedFromAssessmentofHedgeEffectivenessRecognizedinOCIDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DerivativesScheduleofGainsLossesExcludedFromAssessmentofHedgeEffectivenessRecognizedinOCIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-75ae-9c85-a48131e338fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7d9b-9fed-d806e7ce845f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-75ae-9c85-a48131e338fd" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7d9b-9fed-d806e7ce845f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7d39-94a7-98ad11e26cbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7d9b-9fed-d806e7ce845f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7d39-94a7-98ad11e26cbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7d39-94a7-98ad11e26cbe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7d39-94a7-98ad11e26cbe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7d39-94a7-98ad11e26cbe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7712-b7dc-0ed0fc5c9dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-7d39-94a7-98ad11e26cbe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7712-b7dc-0ed0fc5c9dd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-7cad-bc45-e3dc18c0611f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7712-b7dc-0ed0fc5c9dd4" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-7cad-bc45-e3dc18c0611f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7848-b925-f506b065204e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7712-b7dc-0ed0fc5c9dd4" xlink:to="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7848-b925-f506b065204e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7133-b4bc-0a35fbb1525d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c9ac0-6be0-7d9b-9fed-d806e7ce845f" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7133-b4bc-0a35fbb1525d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7133-b4bc-0a35fbb1525d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7133-b4bc-0a35fbb1525d" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7133-b4bc-0a35fbb1525d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7657-b408-93ba2b60c492" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019c9ac0-6be0-7133-b4bc-0a35fbb1525d" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7657-b408-93ba2b60c492" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-74f1-843e-548dded1fb9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019c9ac0-6be0-7657-b408-93ba2b60c492" xlink:to="loc_us-gaap_FairValueHedgingMember_019c9ac0-6be0-74f1-843e-548dded1fb9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_019c9ac0-6be0-7bd1-8b89-093509626d61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c9ac0-6be0-75ae-9c85-a48131e338fd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_019c9ac0-6be0-7bd1-8b89-093509626d61" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DerivativesScheduleofGainsLossesRelatedtoDerivativesNotDesignatedasHedgesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DerivativesScheduleofGainsLossesRelatedtoDerivativesNotDesignatedasHedgesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DerivativesScheduleofGainsLossesRelatedtoDerivativesNotDesignatedasHedgesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-794f-9107-b21a3c2f656f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7598-9e71-fcfde5980bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-794f-9107-b21a3c2f656f" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7598-9e71-fcfde5980bc0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-748b-801a-85dd46b794b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7598-9e71-fcfde5980bc0" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-748b-801a-85dd46b794b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-748b-801a-85dd46b794b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-748b-801a-85dd46b794b8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-748b-801a-85dd46b794b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c9ac0-6be0-748b-801a-85dd46b794b8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019c9ac0-6be0-7553-9c73-7c9cabff72c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:to="loc_us-gaap_StockOptionMember_019c9ac0-6be0-7553-9c73-7c9cabff72c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeFutureMember_019c9ac0-6be0-78a0-9042-3f68ece07545" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeFutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:to="loc_us-gaap_ForeignExchangeFutureMember_019c9ac0-6be0-78a0-9042-3f68ece07545" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7015-8666-b8d15dbaa462" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:to="loc_us-gaap_CurrencySwapMember_019c9ac0-6be0-7015-8666-b8d15dbaa462" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-70e9-9c54-8a8a3bedb742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:to="loc_us-gaap_InterestRateSwapMember_019c9ac0-6be0-70e9-9c54-8a8a3bedb742" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-7976-b85c-da187a07a5c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019c9ac0-6be0-7976-b85c-da187a07a5c1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EmbeddedDerivativesFinancialInstrumentsFundsWithheldIncludingRelatedPartyMember_019c9ac0-6be0-752e-b7de-9121569e564c" xlink:href="apo-20260331.xsd#apo_EmbeddedDerivativesFinancialInstrumentsFundsWithheldIncludingRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:to="loc_apo_EmbeddedDerivativesFinancialInstrumentsFundsWithheldIncludingRelatedPartyMember_019c9ac0-6be0-752e-b7de-9121569e564c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EmbeddedDerivativesFinancialInstrumentsIndexedAnnuityProductsMember_019c9ac0-6be0-73fd-b0d6-6630bbe135e3" xlink:href="apo-20260331.xsd#apo_EmbeddedDerivativesFinancialInstrumentsIndexedAnnuityProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c9ac0-6be0-7100-bc7f-f3518c6461ea" xlink:to="loc_apo_EmbeddedDerivativesFinancialInstrumentsIndexedAnnuityProductsMember_019c9ac0-6be0-73fd-b0d6-6630bbe135e3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c9ac0-6be0-7dd6-a258-314058b28dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019c9ac0-6be0-7598-9e71-fcfde5980bc0" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c9ac0-6be0-7dd6-a258-314058b28dbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c9ac0-6be0-7dd6-a258-314058b28dbc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c9ac0-6be0-7dd6-a258-314058b28dbc" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c9ac0-6be0-7dd6-a258-314058b28dbc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c9ac0-6be0-7eb0-b78f-98de25dadc91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c9ac0-6be0-7dd6-a258-314058b28dbc" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c9ac0-6be0-7eb0-b78f-98de25dadc91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeExpenseMember_019c9ac0-6be0-7861-b07b-4d4a6e44504c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c9ac0-6be0-7eb0-b78f-98de25dadc91" xlink:to="loc_us-gaap_InvestmentIncomeExpenseMember_019c9ac0-6be0-7861-b07b-4d4a6e44504c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestSensitiveContractBenefitsMember_019c9ac0-6be0-731d-a5a5-5a22cdb632d8" xlink:href="apo-20260331.xsd#apo_InterestSensitiveContractBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c9ac0-6be0-7eb0-b78f-98de25dadc91" xlink:to="loc_apo_InterestSensitiveContractBenefitsMember_019c9ac0-6be0-731d-a5a5-5a22cdb632d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019c9ac0-6be0-76cf-9171-c057b7d64bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019c9ac0-6be0-794f-9107-b21a3c2f656f" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019c9ac0-6be0-76cf-9171-c057b7d64bbf" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/VariableInterestEntitiesNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#VariableInterestEntitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/VariableInterestEntitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dbd06-fb0c-74ad-abf9-012b3b1f948c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019dbd06-fb0c-7bca-9c22-04c3d86fa7d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dbd06-fb0c-74ad-abf9-012b3b1f948c" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019dbd06-fb0c-7bca-9c22-04c3d86fa7d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019dbd06-fb0c-7604-aeaa-f336e34657a0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019dbd06-fb0c-7bca-9c22-04c3d86fa7d2" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019dbd06-fb0c-7604-aeaa-f336e34657a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019dbd06-fb0c-7604-aeaa-f336e34657a0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019dbd06-fb0c-7604-aeaa-f336e34657a0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019dbd06-fb0c-7604-aeaa-f336e34657a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019dbd06-fb0c-7afc-b954-567b044cedec" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019dbd06-fb0c-7604-aeaa-f336e34657a0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019dbd06-fb0c-7afc-b954-567b044cedec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019dbd06-fb0c-7cd2-a4a7-fe6029f5c5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019dbd06-fb0c-7afc-b954-567b044cedec" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019dbd06-fb0c-7cd2-a4a7-fe6029f5c5a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_019dbd06-fb0c-73c9-b055-e438355e04ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019dbd06-fb0c-74ad-abf9-012b3b1f948c" xlink:to="loc_us-gaap_RestrictedCash_019dbd06-fb0c-73c9-b055-e438355e04ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/VariableInterestEntitiesScheduleofConsolidatedVIEsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#VariableInterestEntitiesScheduleofConsolidatedVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/VariableInterestEntitiesScheduleofConsolidatedVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6be0-735b-9607-30e8e1796fc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6be0-7084-9872-aea6138b438d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6be0-735b-9607-30e8e1796fc7" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6be0-7084-9872-aea6138b438d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7be0-b191-7fe7a18bcaff" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6be0-7084-9872-aea6138b438d" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7be0-b191-7fe7a18bcaff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7be0-b191-7fe7a18bcaff_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7be0-b191-7fe7a18bcaff" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7be0-b191-7fe7a18bcaff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7634-b4c1-2abb91993eee" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7be0-b191-7fe7a18bcaff" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7634-b4c1-2abb91993eee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7b01-a5ec-1f3b759b4d70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7634-b4c1-2abb91993eee" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7b01-a5ec-1f3b759b4d70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7021-919f-5a1b130e5368" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019c9ac0-6be0-7084-9872-aea6138b438d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7021-919f-5a1b130e5368" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7021-919f-5a1b130e5368_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7021-919f-5a1b130e5368" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7021-919f-5a1b130e5368_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-736c-aab7-7c4aa71c3f7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7021-919f-5a1b130e5368" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-736c-aab7-7c4aa71c3f7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7390-8fcc-a67e0cd0973a" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-736c-aab7-7c4aa71c3f7f" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7390-8fcc-a67e0cd0973a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6be0-7d89-a61f-2d472b07152f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6be0-735b-9607-30e8e1796fc7" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6be0-7d89-a61f-2d472b07152f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019c9ac0-6be0-7627-9b05-5b676db35ed7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6be0-735b-9607-30e8e1796fc7" xlink:to="loc_us-gaap_EquityMethodInvestments_019c9ac0-6be0-7627-9b05-5b676db35ed7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PerformanceAllocations_019c9ac0-6be0-71e9-81e7-c5a89e102afe" xlink:href="apo-20260331.xsd#apo_PerformanceAllocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6be0-735b-9607-30e8e1796fc7" xlink:to="loc_apo_PerformanceAllocations_019c9ac0-6be0-71e9-81e7-c5a89e102afe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019c9ac0-6be0-7a59-be29-6c3acb479f7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6be0-735b-9607-30e8e1796fc7" xlink:to="loc_us-gaap_OtherInvestments_019c9ac0-6be0-7a59-be29-6c3acb479f7d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019c9ac0-6be0-7eea-b81a-8df7d5489c6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019c9ac0-6be0-735b-9607-30e8e1796fc7" xlink:to="loc_us-gaap_Investments_019c9ac0-6be0-7eea-b81a-8df7d5489c6c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/VariableInterestEntitiesScheduleofNetGainsLossesfromInvestmentActivitiesofConsolidatedVIEsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#VariableInterestEntitiesScheduleofNetGainsLossesfromInvestmentActivitiesofConsolidatedVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/VariableInterestEntitiesScheduleofNetGainsLossesfromInvestmentActivitiesofConsolidatedVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-74ff-a068-b7ed6a5d5a75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-75da-991a-9062804ad452" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-74ff-a068-b7ed6a5d5a75" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-75da-991a-9062804ad452" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-78d2-abdc-a6746358cfbf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-75da-991a-9062804ad452" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-78d2-abdc-a6746358cfbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-78d2-abdc-a6746358cfbf_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-78d2-abdc-a6746358cfbf" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-78d2-abdc-a6746358cfbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7e96-91fb-c2ef34ff0fca" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-78d2-abdc-a6746358cfbf" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7e96-91fb-c2ef34ff0fca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7ccb-9c83-047869c95eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7e96-91fb-c2ef34ff0fca" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7ccb-9c83-047869c95eb4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7195-b0db-b5f879543812" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-75da-991a-9062804ad452" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7195-b0db-b5f879543812" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7195-b0db-b5f879543812_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7195-b0db-b5f879543812" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7195-b0db-b5f879543812_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7bde-9b7f-cecccec02a5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7195-b0db-b5f879543812" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7bde-9b7f-cecccec02a5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-73ee-b38b-845818a9638c" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7bde-9b7f-cecccec02a5c" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-73ee-b38b-845818a9638c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiGainLoss_019c9ac0-6be0-77c7-b229-2c6c12c55708" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-74ff-a068-b7ed6a5d5a75" xlink:to="loc_us-gaap_EquitySecuritiesFvNiGainLoss_019c9ac0-6be0-77c7-b229-2c6c12c55708" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesGainLoss_019c9ac0-6be0-76f6-9b6a-66ad63a61598" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-74ff-a068-b7ed6a5d5a75" xlink:to="loc_us-gaap_DebtSecuritiesGainLoss_019c9ac0-6be0-76f6-9b6a-66ad63a61598" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndOtherIncome_019c9ac0-6be0-7ebf-aac8-48c1853a58fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndOtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-74ff-a068-b7ed6a5d5a75" xlink:to="loc_us-gaap_InterestAndOtherIncome_019c9ac0-6be0-7ebf-aac8-48c1853a58fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestAndOtherExpenses_019c9ac0-6be0-7940-a438-8d1f75d1dbc7" xlink:href="apo-20260331.xsd#apo_InterestAndOtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-74ff-a068-b7ed6a5d5a75" xlink:to="loc_apo_InterestAndOtherExpenses_019c9ac0-6be0-7940-a438-8d1f75d1dbc7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019c9ac0-6be0-7d11-9849-46f92f1d4110" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-74ff-a068-b7ed6a5d5a75" xlink:to="loc_us-gaap_GainLossOnInvestments_019c9ac0-6be0-7d11-9849-46f92f1d4110" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/VariableInterestEntitiesScheduleofRevenuesExpensesandOtherGainslossesRelatedtoActivitiesofVIEsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#VariableInterestEntitiesScheduleofRevenuesExpensesandOtherGainslossesRelatedtoActivitiesofVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/VariableInterestEntitiesScheduleofRevenuesExpensesandOtherGainslossesRelatedtoActivitiesofVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7066-b500-79dacbfa7aed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-7eb2-a7a9-0bb17f1438ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7066-b500-79dacbfa7aed" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-7eb2-a7a9-0bb17f1438ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-792b-82f7-00f21fa17e86" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-7eb2-a7a9-0bb17f1438ea" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-792b-82f7-00f21fa17e86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-792b-82f7-00f21fa17e86_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-792b-82f7-00f21fa17e86" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-792b-82f7-00f21fa17e86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-76a2-9ceb-34e63ccdc53d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-792b-82f7-00f21fa17e86" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-76a2-9ceb-34e63ccdc53d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7d60-a048-5f0ec59a77be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-76a2-9ceb-34e63ccdc53d" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7d60-a048-5f0ec59a77be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_019c9ac0-6be0-775f-b331-951dc3bd0ff2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7066-b500-79dacbfa7aed" xlink:to="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_019c9ac0-6be0-775f-b331-951dc3bd0ff2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityExpense_019c9ac0-6be0-750c-beb1-524d6333a9c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7066-b500-79dacbfa7aed" xlink:to="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityExpense_019c9ac0-6be0-750c-beb1-524d6333a9c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOtherMeasureOfActivityAmount_019c9ac0-6be0-77ef-9072-0e78100ca304" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOtherMeasureOfActivityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7066-b500-79dacbfa7aed" xlink:to="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOtherMeasureOfActivityAmount_019c9ac0-6be0-77ef-9072-0e78100ca304" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/VariableInterestEntitiesScheduleofPrincipalProvisionsofSubscriptionLinesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#VariableInterestEntitiesScheduleofPrincipalProvisionsofSubscriptionLinesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/VariableInterestEntitiesScheduleofPrincipalProvisionsofSubscriptionLinesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6be0-715f-a0f2-dade90599d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c9ac0-6be0-74be-b412-36a675d863eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6be0-715f-a0f2-dade90599d5c" xlink:to="loc_us-gaap_DebtInstrumentTable_019c9ac0-6be0-74be-b412-36a675d863eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7cc5-a524-10c69604bb68" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6be0-74be-b412-36a675d863eb" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7cc5-a524-10c69604bb68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7cc5-a524-10c69604bb68_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7cc5-a524-10c69604bb68" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7cc5-a524-10c69604bb68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-739c-89eb-eee9c6c2d7f6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7cc5-a524-10c69604bb68" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-739c-89eb-eee9c6c2d7f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7b7b-95d0-399ec0b69bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-739c-89eb-eee9c6c2d7f6" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7b7b-95d0-399ec0b69bd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6be0-7533-a5b1-0cacef932f33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6be0-74be-b412-36a675d863eb" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6be0-7533-a5b1-0cacef932f33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6be0-7533-a5b1-0cacef932f33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6be0-7533-a5b1-0cacef932f33" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6be0-7533-a5b1-0cacef932f33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6be0-7257-a175-a8cb4fa8b994" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6be0-7533-a5b1-0cacef932f33" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6be0-7257-a175-a8cb4fa8b994" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c9ac0-6be0-7edd-b42f-1b675b52f807" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6be0-7257-a175-a8cb4fa8b994" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c9ac0-6be0-7edd-b42f-1b675b52f807" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-72ba-826b-33fc30f11b49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6be0-74be-b412-36a675d863eb" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-72ba-826b-33fc30f11b49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-72ba-826b-33fc30f11b49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-72ba-826b-33fc30f11b49" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-72ba-826b-33fc30f11b49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-728f-a384-21596bd004ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-72ba-826b-33fc30f11b49" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-728f-a384-21596bd004ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-78ea-b60f-4cf59ee93395" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-728f-a384-21596bd004ad" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-78ea-b60f-4cf59ee93395" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019c9ac0-6be0-7d0a-aad3-196b9a01b131" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6be0-715f-a0f2-dade90599d5c" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019c9ac0-6be0-7d0a-aad3-196b9a01b131" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019c9ac0-6be0-7f73-b873-e98818edb8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6be0-715f-a0f2-dade90599d5c" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019c9ac0-6be0-7f73-b873-e98818edb8d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DebtInstrumentWeightedAverageRemainingTerm_019c9ac0-6be0-787e-b227-569a9ccddf9a" xlink:href="apo-20260331.xsd#apo_DebtInstrumentWeightedAverageRemainingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6be0-715f-a0f2-dade90599d5c" xlink:to="loc_apo_DebtInstrumentWeightedAverageRemainingTerm_019c9ac0-6be0-787e-b227-569a9ccddf9a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/VariableInterestEntitiesScheduleofStatementsofOperationsActivityoftheConsolidatedVIEsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#VariableInterestEntitiesScheduleofStatementsofOperationsActivityoftheConsolidatedVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/VariableInterestEntitiesScheduleofStatementsofOperationsActivityoftheConsolidatedVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6be0-767a-be7f-96942ec9b205" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6be0-767a-be7f-96942ec9b205" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7468-abb1-04e65eadae9d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6be0-767a-be7f-96942ec9b205" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7468-abb1-04e65eadae9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7468-abb1-04e65eadae9d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7468-abb1-04e65eadae9d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7468-abb1-04e65eadae9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7a83-ba87-714ab8d547d4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7468-abb1-04e65eadae9d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7a83-ba87-714ab8d547d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7fb6-bb46-9a44f921c9fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7a83-ba87-714ab8d547d4" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7fb6-bb46-9a44f921c9fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-754e-a731-5c2b3b2bb156" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6be0-767a-be7f-96942ec9b205" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-754e-a731-5c2b3b2bb156" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-754e-a731-5c2b3b2bb156_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-754e-a731-5c2b3b2bb156" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-754e-a731-5c2b3b2bb156_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7d88-a9bf-66e2c589c8a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-754e-a731-5c2b3b2bb156" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7d88-a9bf-66e2c589c8a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-70ef-b807-1f0d95715c17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7d88-a9bf-66e2c589c8a9" xlink:to="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-70ef-b807-1f0d95715c17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019c9ac0-6be0-71b5-86e0-60f59b1aa3bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7d88-a9bf-66e2c589c8a9" xlink:to="loc_us-gaap_LoansReceivableMember_019c9ac0-6be0-71b5-86e0-60f59b1aa3bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsMember_019c9ac0-6be0-70b0-b3af-40b16f569d2a" xlink:href="apo-20260331.xsd#apo_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7d88-a9bf-66e2c589c8a9" xlink:to="loc_apo_InvestmentFundsMember_019c9ac0-6be0-70b0-b3af-40b16f569d2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6be0-7217-96a3-9d82492dcebe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7d88-a9bf-66e2c589c8a9" xlink:to="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6be0-7217-96a3-9d82492dcebe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7e71-89e6-aec7e29dbf97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019c9ac0-6be0-767a-be7f-96942ec9b205" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7e71-89e6-aec7e29dbf97" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7e71-89e6-aec7e29dbf97_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7e71-89e6-aec7e29dbf97" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7e71-89e6-aec7e29dbf97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-717a-a98c-f0a871b63e8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7e71-89e6-aec7e29dbf97" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-717a-a98c-f0a871b63e8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-7190-82a3-ea6de158f0ee" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-717a-a98c-f0a871b63e8c" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-7190-82a3-ea6de158f0ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019c9ac0-6be0-792a-861a-e5d216dc0427" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_us-gaap_NetInvestmentIncome_019c9ac0-6be0-792a-861a-e5d216dc0427" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingUnrealizedGainLoss_019c9ac0-6be0-7485-b678-95160587964e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesTradingUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_us-gaap_DebtSecuritiesTradingUnrealizedGainLoss_019c9ac0-6be0-7485-b678-95160587964e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans_019c9ac0-6be0-7be9-9544-47e73bc1efca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfMortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_us-gaap_GainLossOnSaleOfMortgageLoans_019c9ac0-6be0-7be9-9544-47e73bc1efca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsRelatedToInvestment_019c9ac0-6be0-7491-9aae-9a8f500201d6" xlink:href="apo-20260331.xsd#apo_InvestmentFundsRelatedToInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_apo_InvestmentFundsRelatedToInvestment_019c9ac0-6be0-7491-9aae-9a8f500201d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingGainsLosses_019c9ac0-6be0-72e2-9dea-56250bf81153" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_us-gaap_OtherNonoperatingGainsLosses_019c9ac0-6be0-72e2-9dea-56250bf81153" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019c9ac0-6be0-7752-b7e2-d05d84d71ca4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_us-gaap_GainLossOnInvestments_019c9ac0-6be0-7752-b7e2-d05d84d71ca4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c9ac0-6be0-7c05-a6af-6d13e235e1d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019c9ac0-6be0-7b5c-aa02-fdb062d1a8f7" xlink:to="loc_us-gaap_Revenues_019c9ac0-6be0-7c05-a6af-6d13e235e1d1" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/VariableInterestEntitiesScheduleofCarryingValueandMaximumLossExposureDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#VariableInterestEntitiesScheduleofCarryingValueandMaximumLossExposureDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/VariableInterestEntitiesScheduleofCarryingValueandMaximumLossExposureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7856-8a69-04f9d4d1b965" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-76f1-a8ab-22d60705acd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7856-8a69-04f9d4d1b965" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-76f1-a8ab-22d60705acd5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7545-9978-f92ac0c7f43f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-76f1-a8ab-22d60705acd5" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7545-9978-f92ac0c7f43f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7545-9978-f92ac0c7f43f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7545-9978-f92ac0c7f43f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7545-9978-f92ac0c7f43f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-73ce-8749-e519d5e70500" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7545-9978-f92ac0c7f43f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-73ce-8749-e519d5e70500" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019c9ac0-6be0-724c-9661-5de9e8853511" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-73ce-8749-e519d5e70500" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019c9ac0-6be0-724c-9661-5de9e8853511" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-719f-a615-cff8ea59359c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-73ce-8749-e519d5e70500" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-719f-a615-cff8ea59359c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7964-b573-2d823aef880d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-76f1-a8ab-22d60705acd5" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7964-b573-2d823aef880d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7964-b573-2d823aef880d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7964-b573-2d823aef880d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7964-b573-2d823aef880d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-710b-b136-29dbd5f8c9e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7964-b573-2d823aef880d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-710b-b136-29dbd5f8c9e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7f11-ac17-f1c4cb796b85" xlink:href="apo-20260331.xsd#apo_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-710b-b136-29dbd5f8c9e8" xlink:to="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7f11-ac17-f1c4cb796b85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6be0-728d-ac17-3e23918116a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-710b-b136-29dbd5f8c9e8" xlink:to="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6be0-728d-ac17-3e23918116a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6be0-7aac-9d1e-2b92ba6b97b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-710b-b136-29dbd5f8c9e8" xlink:to="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6be0-7aac-9d1e-2b92ba6b97b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7db9-9bfa-e3ff6cd8f418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019c9ac0-6be0-76f1-a8ab-22d60705acd5" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7db9-9bfa-e3ff6cd8f418" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7db9-9bfa-e3ff6cd8f418_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7db9-9bfa-e3ff6cd8f418" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7db9-9bfa-e3ff6cd8f418_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7452-ac95-b6ddc980da94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7db9-9bfa-e3ff6cd8f418" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7452-ac95-b6ddc980da94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-75bc-8fca-b455382fe985" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7452-ac95-b6ddc980da94" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-75bc-8fca-b455382fe985" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure_019c9ac0-6be0-7a30-b29e-f1a06dc98ff7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7856-8a69-04f9d4d1b965" xlink:to="loc_us-gaap_VariableInterestDifferenceBetweenCarryingAmountAndMaximumExposure_019c9ac0-6be0-7a30-b29e-f1a06dc98ff7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019c9ac0-6be0-78ad-ace5-ab4d715a38ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019c9ac0-6be0-7856-8a69-04f9d4d1b965" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019c9ac0-6be0-78ad-ace5-ab4d715a38ff" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/FairValueScheduleofFinancialAssetsandLiabilitiesRecordedatFairValueHierarchyLevelDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#FairValueScheduleofFinancialAssetsandLiabilitiesRecordedatFairValueHierarchyLevelDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/FairValueScheduleofFinancialAssetsandLiabilitiesRecordedatFairValueHierarchyLevelDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c9ac0-6be0-7fb7-a53f-4c8d9fe4df6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c9ac0-6be0-7fb7-a53f-4c8d9fe4df6c" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7d71-b908-7a9f83a7ab17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7d71-b908-7a9f83a7ab17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-7d71-b908-7a9f83a7ab17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7d71-b908-7a9f83a7ab17" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-7d71-b908-7a9f83a7ab17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-75e8-b97b-10a59d61a00d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7d71-b908-7a9f83a7ab17" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-75e8-b97b-10a59d61a00d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019c9ac0-6be0-7cf5-af16-fc03c63d7410" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-75e8-b97b-10a59d61a00d" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019c9ac0-6be0-7cf5-af16-fc03c63d7410" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c9ac0-6be0-7f6f-898b-077defbffb21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-75e8-b97b-10a59d61a00d" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c9ac0-6be0-7f6f-898b-077defbffb21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c9ac0-6be0-7bbe-b651-62aad0319f9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-75e8-b97b-10a59d61a00d" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c9ac0-6be0-7bbe-b651-62aad0319f9e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019c9ac0-6be0-748b-b738-33a9eda995d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-75e8-b97b-10a59d61a00d" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019c9ac0-6be0-748b-b738-33a9eda995d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-75b3-9d4c-2a5918f3ca49" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-75b3-9d4c-2a5918f3ca49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-75b3-9d4c-2a5918f3ca49_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-75b3-9d4c-2a5918f3ca49" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-75b3-9d4c-2a5918f3ca49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7816-80cd-4bedf12d6481" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-75b3-9d4c-2a5918f3ca49" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7816-80cd-4bedf12d6481" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019c9ac0-6be0-7e8c-bbd9-3d4040dc9bda" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7816-80cd-4bedf12d6481" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019c9ac0-6be0-7e8c-bbd9-3d4040dc9bda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-707e-bcd0-9607cb431b82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7816-80cd-4bedf12d6481" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-707e-bcd0-9607cb431b82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-79fd-ae50-b53b843c22fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-79fd-ae50-b53b843c22fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-79fd-ae50-b53b843c22fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-79fd-ae50-b53b843c22fc" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-79fd-ae50-b53b843c22fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7969-8b53-6ef5ea7bb026" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-79fd-ae50-b53b843c22fc" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7969-8b53-6ef5ea7bb026" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-73ec-92d9-737b979ca807" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7969-8b53-6ef5ea7bb026" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-73ec-92d9-737b979ca807" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7b1a-963f-99ac17cc35fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7b1a-963f-99ac17cc35fe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7b1a-963f-99ac17cc35fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7b1a-963f-99ac17cc35fe" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7b1a-963f-99ac17cc35fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78a8-8f71-f302c0d70e66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7b1a-963f-99ac17cc35fe" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78a8-8f71-f302c0d70e66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7ac9-b8ed-a805a749ac4a" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78a8-8f71-f302c0d70e66" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7ac9-b8ed-a805a749ac4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-75a0-9575-b21695f27226" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78a8-8f71-f302c0d70e66" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-75a0-9575-b21695f27226" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-70df-8852-70901f3d3341" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-70df-8852-70901f3d3341" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-70df-8852-70901f3d3341_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-70df-8852-70901f3d3341" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-70df-8852-70901f3d3341_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-70df-8852-70901f3d3341" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019c9ac0-6be0-7791-9881-80501ec3646a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019c9ac0-6be0-7791-9881-80501ec3646a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6be0-73c1-a8ee-46bbecfadc78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6be0-73c1-a8ee-46bbecfadc78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019c9ac0-6be0-7658-9261-88728439ec79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019c9ac0-6be0-7658-9261-88728439ec79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6be0-76e2-87e4-f2e79257b76a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6be0-76e2-87e4-f2e79257b76a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6be0-7f52-9675-4ffe9bea28ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6be0-7f52-9675-4ffe9bea28ec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6be0-7cf2-8df3-1d3addf6a000" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6be0-7cf2-8df3-1d3addf6a000" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6be0-748b-a1e6-f1ebc5387080" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6be0-748b-a1e6-f1ebc5387080" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6be0-75ef-864a-19e127b8583b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6be0-75ef-864a-19e127b8583b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AmerUsLifeInsuranceCompanyAmerUsClosedBlockMember_019c9ac0-6be0-7459-b8d5-aaecd8cae76d" xlink:href="apo-20260331.xsd#apo_AmerUsLifeInsuranceCompanyAmerUsClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_apo_AmerUsLifeInsuranceCompanyAmerUsClosedBlockMember_019c9ac0-6be0-7459-b8d5-aaecd8cae76d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_IndianapolisLifeInsuranceCompanyILICOClosedBlockMember_019c9ac0-6be0-7834-9577-3ead9c6ffd12" xlink:href="apo-20260331.xsd#apo_IndianapolisLifeInsuranceCompanyILICOClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7743-9b0f-c470e466e15a" xlink:to="loc_apo_IndianapolisLifeInsuranceCompanyILICOClosedBlockMember_019c9ac0-6be0-7834-9577-3ead9c6ffd12" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd775-f476-7a5a-89d8-f8d4de882a69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019c9ac0-6be0-70a0-9c18-a6de83bf951c" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd775-f476-7a5a-89d8-f8d4de882a69" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd775-f476-7a5a-89d8-f8d4de882a69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd775-f476-7a5a-89d8-f8d4de882a69" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd775-f476-7a5a-89d8-f8d4de882a69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd775-f476-7060-8797-02c52bb1dc3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd775-f476-7a5a-89d8-f8d4de882a69" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd775-f476-7060-8797-02c52bb1dc3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019cd775-f476-7986-a761-b83387ce8418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd775-f476-7060-8797-02c52bb1dc3b" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019cd775-f476-7986-a761-b83387ce8418" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c9ac0-6be0-7fb7-a53f-4c8d9fe4df6c" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c9ac0-6be0-7aba-9248-517549792356" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c9ac0-6be0-7aba-9248-517549792356" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019c9ac0-6be0-7b06-9031-0b27ab47ba30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019c9ac0-6be0-7b06-9031-0b27ab47ba30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6be0-7f9a-8e76-1e719d08ca75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6be0-7f9a-8e76-1e719d08ca75" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DueFromRelatedPartiesFairValueDisclosure_019c9ac0-6be0-77ed-bd51-659a89d27ffa" xlink:href="apo-20260331.xsd#apo_DueFromRelatedPartiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_apo_DueFromRelatedPartiesFairValueDisclosure_019c9ac0-6be0-77ed-bd51-659a89d27ffa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019c9ac0-6be0-735f-92df-bbeb2288feb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_DerivativeAssets_019c9ac0-6be0-735f-92df-bbeb2288feb9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6be0-7d9d-ac0a-ba95dc175275" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6be0-7d9d-ac0a-ba95dc175275" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019c9ac0-6be0-7f84-93fd-4eb9cb0666b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019c9ac0-6be0-7f84-93fd-4eb9cb0666b7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019c9ac0-6be0-7f51-b7b8-6da926f088d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019c9ac0-6be0-7f51-b7b8-6da926f088d6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019c9ac0-6be0-77e0-b2d4-77bb7d234f82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019c9ac0-6be0-77e0-b2d4-77bb7d234f82" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsFairValueDisclosure_019c9ac0-6be0-7c14-abb8-82b39ec43c16" xlink:href="apo-20260331.xsd#apo_InvestmentFundsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_apo_InvestmentFundsFairValueDisclosure_019c9ac0-6be0-7c14-abb8-82b39ec43c16" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019c9ac0-6be0-7080-82a1-aab4a9ea4480" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019c9ac0-6be0-7080-82a1-aab4a9ea4480" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019c9ac0-6be0-7ebf-9261-ac4624b58095" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019c9ac0-6be0-7ebf-9261-ac4624b58095" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShortTermInvestmentsFairValueDisclosure_019c9ac0-6be0-72af-9fdf-4e4a38a5e214" xlink:href="apo-20260331.xsd#apo_ShortTermInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_apo_ShortTermInvestmentsFairValueDisclosure_019c9ac0-6be0-72af-9fdf-4e4a38a5e214" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherInvestmentsFairValueDisclosure_019c9ac0-6be0-77c0-9eb6-02e5661d4967" xlink:href="apo-20260331.xsd#apo_OtherInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_apo_OtherInvestmentsFairValueDisclosure_019c9ac0-6be0-77c0-9eb6-02e5661d4967" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019c9ac0-6be0-7f97-89e2-321b77119cdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019c9ac0-6be0-7f97-89e2-321b77119cdf" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ReinsuranceRecoverableFairValueDisclosure_019c9ac0-6be0-72ca-8203-ecd8b8db2107" xlink:href="apo-20260331.xsd#apo_ReinsuranceRecoverableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_apo_ReinsuranceRecoverableFairValueDisclosure_019c9ac0-6be0-72ca-8203-ecd8b8db2107" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_019c9ac0-6be0-7c26-ab1f-4781c60e238d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_019c9ac0-6be0-7c26-ab1f-4781c60e238d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019c9ac0-6be0-7ea1-aee2-b0ace0eac8d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c9ac0-6be0-7224-9c42-cc288f3bc3ef" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019c9ac0-6be0-7ea1-aee2-b0ace0eac8d0" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019c9ac0-6be0-7fb7-a53f-4c8d9fe4df6c" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DueToRelatedPartiesLiability_019ddc54-a7c3-7770-a903-a5ad84907005" xlink:href="apo-20260331.xsd#apo_DueToRelatedPartiesLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_apo_DueToRelatedPartiesLiability_019ddc54-a7c3-7770-a903-a5ad84907005" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019c9ac0-6be0-7348-88c7-b054a23f7e34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019c9ac0-6be0-7348-88c7-b054a23f7e34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019c9ac0-6be0-75ae-9a37-de31a8b98c31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_us-gaap_DerivativeLiabilities_019c9ac0-6be0-75ae-9a37-de31a8b98c31" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019c9ac0-6be0-7d3d-9e51-140d031f30f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019c9ac0-6be0-7d3d-9e51-140d031f30f6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_UniversalLifeBenefitsFairValueDisclosure_019c9ac0-6be0-73c8-94f2-719cede93c7d" xlink:href="apo-20260331.xsd#apo_UniversalLifeBenefitsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_apo_UniversalLifeBenefitsFairValueDisclosure_019c9ac0-6be0-73c8-94f2-719cede93c7d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ClosedBlockLiabilitiesFairValueDisclosure_019c9ac0-6be0-7ef8-8cf8-78324d6d9538" xlink:href="apo-20260331.xsd#apo_ClosedBlockLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_apo_ClosedBlockLiabilitiesFairValueDisclosure_019c9ac0-6be0-7ef8-8cf8-78324d6d9538" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019c9ac0-6be0-767d-a465-cf0706a6d49f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019c9ac0-6be0-767d-a465-cf0706a6d49f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_019c9ac0-6be0-7296-b8de-5aa9bc55d6da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_019c9ac0-6be0-7296-b8de-5aa9bc55d6da" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019c9ac0-6be0-7926-aca5-3df289e51760" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019c9ac0-6be0-7926-aca5-3df289e51760" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PerformanceAllocations_019c9ac0-6be0-7d4a-9f54-7b1f2f613037" xlink:href="apo-20260331.xsd#apo_PerformanceAllocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c9ac0-6be0-788b-bb13-81688ee50803" xlink:to="loc_apo_PerformanceAllocations_019c9ac0-6be0-7d4a-9f54-7b1f2f613037" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/FairValueScheduleofValuationTechniquesandQuantitativeInputsandAssumptionsusedforFinancialAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#FairValueScheduleofValuationTechniquesandQuantitativeInputsandAssumptionsusedforFinancialAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/FairValueScheduleofValuationTechniquesandQuantitativeInputsandAssumptionsusedforFinancialAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-781c-850e-d875d27b5fe0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-781c-850e-d875d27b5fe0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-781c-850e-d875d27b5fe0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-781c-850e-d875d27b5fe0" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-781c-850e-d875d27b5fe0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-73b4-93f4-49dbc165ad25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-781c-850e-d875d27b5fe0" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-73b4-93f4-49dbc165ad25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7d5f-a75e-42c21fb374c9" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-73b4-93f4-49dbc165ad25" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7d5f-a75e-42c21fb374c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-7896-9fa3-8a00e6c73fdd" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-73b4-93f4-49dbc165ad25" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-7896-9fa3-8a00e6c73fdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c9ac0-6be0-70af-97e3-cc9e8a5db75a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:to="loc_srt_RangeAxis_019c9ac0-6be0-70af-97e3-cc9e8a5db75a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6be0-70af-97e3-cc9e8a5db75a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c9ac0-6be0-70af-97e3-cc9e8a5db75a" xlink:to="loc_srt_RangeMember_019c9ac0-6be0-70af-97e3-cc9e8a5db75a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6be0-7bf8-aa82-b4eb2792ad5d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c9ac0-6be0-70af-97e3-cc9e8a5db75a" xlink:to="loc_srt_RangeMember_019c9ac0-6be0-7bf8-aa82-b4eb2792ad5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c9ac0-6be0-7404-b977-d0e77df74d64" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6be0-7bf8-aa82-b4eb2792ad5d" xlink:to="loc_srt_MinimumMember_019c9ac0-6be0-7404-b977-d0e77df74d64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c9ac0-6be0-79a8-87b2-4059f4c28967" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6be0-7bf8-aa82-b4eb2792ad5d" xlink:to="loc_srt_MaximumMember_019c9ac0-6be0-79a8-87b2-4059f4c28967" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019c9ac0-6be0-7d25-a797-1bd97716ade8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6be0-7bf8-aa82-b4eb2792ad5d" xlink:to="loc_srt_WeightedAverageMember_019c9ac0-6be0-7d25-a797-1bd97716ade8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6be0-7b57-b9af-e3795e364c3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6be0-7b57-b9af-e3795e364c3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7b57-b9af-e3795e364c3f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6be0-7b57-b9af-e3795e364c3f" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7b57-b9af-e3795e364c3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6be0-7b57-b9af-e3795e364c3f" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019c9ac0-6be0-75c9-9064-b535e8f25439" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019c9ac0-6be0-75c9-9064-b535e8f25439" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ValuationTechniqueDirectCapitalizationMember_019c9ac0-6be0-7cb1-a140-7b276652650b" xlink:href="apo-20260331.xsd#apo_ValuationTechniqueDirectCapitalizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:to="loc_apo_ValuationTechniqueDirectCapitalizationMember_019c9ac0-6be0-7cb1-a140-7b276652650b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ValuationTechniqueAdjustedTransactionValueMember_019c9ac0-6be0-799d-8a3f-2d62428abbe8" xlink:href="apo-20260331.xsd#apo_ValuationTechniqueAdjustedTransactionValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:to="loc_apo_ValuationTechniqueAdjustedTransactionValueMember_019c9ac0-6be0-799d-8a3f-2d62428abbe8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ValuationTechniqueOptionModelMember_019c9ac0-6be0-7ccd-a019-77a05bcdaf7a" xlink:href="apo-20260331.xsd#apo_ValuationTechniqueOptionModelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:to="loc_apo_ValuationTechniqueOptionModelMember_019c9ac0-6be0-7ccd-a019-77a05bcdaf7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ValuationTechniqueRecoverabilityMember_019c9ac0-6be0-7980-8363-b8411f935445" xlink:href="apo-20260331.xsd#apo_ValuationTechniqueRecoverabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:to="loc_apo_ValuationTechniqueRecoverabilityMember_019c9ac0-6be0-7980-8363-b8411f935445" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ValuationTechniqueReportedNetAssetValueMember_019c9ac0-6be0-7e31-a7ed-e58a0d9fb592" xlink:href="apo-20260331.xsd#apo_ValuationTechniqueReportedNetAssetValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6be0-7bce-932a-b1a1abc783ee" xlink:to="loc_apo_ValuationTechniqueReportedNetAssetValueMember_019c9ac0-6be0-7e31-a7ed-e58a0d9fb592" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7f6b-9555-ce21f4b95028" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7f6b-9555-ce21f4b95028" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-7f6b-9555-ce21f4b95028_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7f6b-9555-ce21f4b95028" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-7f6b-9555-ce21f4b95028_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-710e-b36c-cb2cfb58d463" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7f6b-9555-ce21f4b95028" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-710e-b36c-cb2cfb58d463" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c9ac0-6be0-7cb7-afe5-55a10eafa9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-710e-b36c-cb2cfb58d463" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c9ac0-6be0-7cb7-afe5-55a10eafa9a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6be0-7f41-af88-9b6df55bf32f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6be0-7f41-af88-9b6df55bf32f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-7f41-af88-9b6df55bf32f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6be0-7f41-af88-9b6df55bf32f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-7f41-af88-9b6df55bf32f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6be0-7f41-af88-9b6df55bf32f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_019c9ac0-6be0-7358-8d03-355180f203a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_019c9ac0-6be0-7358-8d03-355180f203a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputTerminalCapitalizationRateMember_019c9ac0-6be0-7d0f-9bdb-01fbaffe8b1d" xlink:href="apo-20260331.xsd#apo_MeasurementInputTerminalCapitalizationRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_apo_MeasurementInputTerminalCapitalizationRateMember_019c9ac0-6be0-7d0f-9bdb-01fbaffe8b1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputVolatilityRateMember_019c9ac0-6be0-7ca9-ae52-2748f9f25afa" xlink:href="apo-20260331.xsd#apo_MeasurementInputVolatilityRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_apo_MeasurementInputVolatilityRateMember_019c9ac0-6be0-7ca9-ae52-2748f9f25afa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputEstimatedProceedsMember_019c9ac0-6be0-70ea-b7e5-aca506e7fc0a" xlink:href="apo-20260331.xsd#apo_MeasurementInputEstimatedProceedsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_apo_MeasurementInputEstimatedProceedsMember_019c9ac0-6be0-70ea-b7e5-aca506e7fc0a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputRecentTransactionMember_019dbd0e-b57f-75e6-b754-bac23e75ac73" xlink:href="apo-20260331.xsd#apo_MeasurementInputRecentTransactionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_apo_MeasurementInputRecentTransactionMember_019dbd0e-b57f-75e6-b754-bac23e75ac73" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputNonperformanceRiskMember_019c9ac0-6be0-7624-a1ad-c66062e53c6d" xlink:href="apo-20260331.xsd#apo_MeasurementInputNonperformanceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_apo_MeasurementInputNonperformanceRiskMember_019c9ac0-6be0-7624-a1ad-c66062e53c6d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputOptionBudgetMember_019c9ac0-6be0-7b40-bae9-f1580e07fe9d" xlink:href="apo-20260331.xsd#apo_MeasurementInputOptionBudgetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_apo_MeasurementInputOptionBudgetMember_019c9ac0-6be0-7b40-bae9-f1580e07fe9d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputSurrenderRateMember_019c9ac0-6be0-7257-b2d5-1ed8e7d985a2" xlink:href="apo-20260331.xsd#apo_MeasurementInputSurrenderRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6be0-71ef-9f42-0618cfbebeec" xlink:to="loc_apo_MeasurementInputSurrenderRateMember_019c9ac0-6be0-7257-b2d5-1ed8e7d985a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7b4e-b0d6-10553b2193f8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7b4e-b0d6-10553b2193f8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7b4e-b0d6-10553b2193f8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7b4e-b0d6-10553b2193f8" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7b4e-b0d6-10553b2193f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7eca-b9a5-8ea051785747" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-7b4e-b0d6-10553b2193f8" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7eca-b9a5-8ea051785747" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-744c-9a58-9de55f445264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7eca-b9a5-8ea051785747" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-744c-9a58-9de55f445264" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7d60-ad72-9fc180713276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019c9ac0-6be0-72f3-b75a-af0e12dfd548" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7d60-ad72-9fc180713276" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7d60-ad72-9fc180713276_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7d60-ad72-9fc180713276" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7d60-ad72-9fc180713276_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7176-8106-64376504b7f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7d60-ad72-9fc180713276" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7176-8106-64376504b7f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BondsMember_019c9ac0-6be0-7d2b-855d-b1358c3edb05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7176-8106-64376504b7f9" xlink:to="loc_us-gaap_BondsMember_019c9ac0-6be0-7d2b-855d-b1358c3edb05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6be0-77ab-a7b5-1291cdd40a23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019c9ac0-6be0-77ab-a7b5-1291cdd40a23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentsMeasurementInput_019c9ac0-6be0-78ad-8dad-dca3bb9ecb33" xlink:href="apo-20260331.xsd#apo_InvestmentsMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_InvestmentsMeasurementInput_019c9ac0-6be0-78ad-8dad-dca3bb9ecb33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DueFromRelatedPartiesFairValueDisclosure_019c9ac0-6be0-7355-9dce-8ca48b1661b1" xlink:href="apo-20260331.xsd#apo_DueFromRelatedPartiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_DueFromRelatedPartiesFairValueDisclosure_019c9ac0-6be0-7355-9dce-8ca48b1661b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DueFromRelatedPartiesMeasurementInput_019c9ac0-6be0-7504-81f6-db2ba576eccc" xlink:href="apo-20260331.xsd#apo_DueFromRelatedPartiesMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_DueFromRelatedPartiesMeasurementInput_019c9ac0-6be0-7504-81f6-db2ba576eccc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019c9ac0-6be0-7734-91ee-4cc661d72db5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_DerivativeAssets_019c9ac0-6be0-7734-91ee-4cc661d72db5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetMeasurementInput_019c9ac0-6be0-746d-84b1-180b0d3fdbf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_DerivativeAssetMeasurementInput_019c9ac0-6be0-746d-84b1-180b0d3fdbf1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BankLoansFairValueDisclosure_019c9ac0-6be0-77c8-8e61-2e924424f11e" xlink:href="apo-20260331.xsd#apo_BankLoansFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_BankLoansFairValueDisclosure_019c9ac0-6be0-77c8-8e61-2e924424f11e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BankLoansMeasurementInput_019c9ac0-6be0-7085-b238-bb96fee5244c" xlink:href="apo-20260331.xsd#apo_BankLoansMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_BankLoansMeasurementInput_019c9ac0-6be0-7085-b238-bb96fee5244c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019c9ac0-6be0-7cbb-8941-24311092cbf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019c9ac0-6be0-7cbb-8941-24311092cbf3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiMeasurementInput_019c9ac0-6be0-7466-ad9e-1aa4c2ce981a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_EquitySecuritiesFvNiMeasurementInput_019c9ac0-6be0-7466-ad9e-1aa4c2ce981a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AvailableForSaleSecuritiesTradingAndEquitySecuritiesFairValueDisclosure_019c9ac0-6be0-7815-bc43-c15a23dc6e79" xlink:href="apo-20260331.xsd#apo_AvailableForSaleSecuritiesTradingAndEquitySecuritiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_AvailableForSaleSecuritiesTradingAndEquitySecuritiesFairValueDisclosure_019c9ac0-6be0-7815-bc43-c15a23dc6e79" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AvailableForSaleSecuritiesTradingAndEquitySecuritiesMeasurementInput_019c9ac0-6be0-7266-809f-901c7aa28232" xlink:href="apo-20260331.xsd#apo_AvailableForSaleSecuritiesTradingAndEquitySecuritiesMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_AvailableForSaleSecuritiesTradingAndEquitySecuritiesMeasurementInput_019c9ac0-6be0-7266-809f-901c7aa28232" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MortgagesFairValueDisclosure_019c9ac0-6be0-79b3-a0be-5ace4f44dd7b" xlink:href="apo-20260331.xsd#apo_MortgagesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_MortgagesFairValueDisclosure_019c9ac0-6be0-79b3-a0be-5ace4f44dd7b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MortgageLoansMeasurementInput_019c9ac0-6be0-7277-8124-a6247791f880" xlink:href="apo-20260331.xsd#apo_MortgageLoansMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_MortgageLoansMeasurementInput_019c9ac0-6be0-7277-8124-a6247791f880" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019c9ac0-6be0-762d-9b0a-a61b5eda5952" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019c9ac0-6be0-762d-9b0a-a61b5eda5952" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DueToRelatedPartiesLiability_019ddc53-4da3-780e-aec8-dd65312905a5" xlink:href="apo-20260331.xsd#apo_DueToRelatedPartiesLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_DueToRelatedPartiesLiability_019ddc53-4da3-780e-aec8-dd65312905a5" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019c9ac0-6be0-7570-83e5-4380135ea28f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019c9ac0-6be0-7570-83e5-4380135ea28f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BankLoansLiabilitiesFairValueDisclosure_019dd3c7-2eab-78d3-8a8b-0b7df410cfc3" xlink:href="apo-20260331.xsd#apo_BankLoansLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_BankLoansLiabilitiesFairValueDisclosure_019dd3c7-2eab-78d3-8a8b-0b7df410cfc3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BankLoansLiabilitiesMeasurementInput_019dd3c8-22bb-7ebd-875e-ec4d542b499e" xlink:href="apo-20260331.xsd#apo_BankLoansLiabilitiesMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_apo_BankLoansLiabilitiesMeasurementInput_019dd3c8-22bb-7ebd-875e-ec4d542b499e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019c9ac0-6be0-7025-9314-6b24b08af527" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019c9ac0-6be0-7025-9314-6b24b08af527" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeAssetMeasurementInput_019c9ac0-6be0-71eb-a329-4dce4056a09f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019c9ac0-6be0-7940-baa2-53bb2339b70f" xlink:to="loc_us-gaap_EmbeddedDerivativeAssetMeasurementInput_019c9ac0-6be0-71eb-a329-4dce4056a09f" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/FairValueScheduleofLevel3AssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#FairValueScheduleofLevel3AssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/FairValueScheduleofLevel3AssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-78a1-9f1c-d331fea483e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-78a1-9f1c-d331fea483e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7528-a387-8a10e8f43cde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-78a1-9f1c-d331fea483e4" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7528-a387-8a10e8f43cde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7528-a387-8a10e8f43cde_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7528-a387-8a10e8f43cde" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7528-a387-8a10e8f43cde_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7528-a387-8a10e8f43cde" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentsAndDerivativeAssetsMember_019c9ac0-6be0-72b3-985f-3f02181ed8c9" xlink:href="apo-20260331.xsd#apo_InvestmentsAndDerivativeAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_apo_InvestmentsAndDerivativeAssetsMember_019c9ac0-6be0-72b3-985f-3f02181ed8c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsMember_019c9ac0-6be0-71de-a9ae-a19765a7abca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_InvestmentsMember_019c9ac0-6be0-71de-a9ae-a19765a7abca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019c9ac0-6be0-775a-a0a2-8b49aef42540" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019c9ac0-6be0-775a-a0a2-8b49aef42540" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6be0-7228-8a81-8b0aa0e406ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6be0-7228-8a81-8b0aa0e406ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6be0-7875-8e9c-486edd2def69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6be0-7875-8e9c-486edd2def69" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6be0-7e65-b2d5-dfb8944524f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6be0-7e65-b2d5-dfb8944524f6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6be0-7dcc-b656-c5ffadb285ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6be0-7dcc-b656-c5ffadb285ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6be0-7930-969d-6a321efcc88b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6be0-7930-969d-6a321efcc88b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-76a0-9565-64f6e96ed51f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-76a0-9565-64f6e96ed51f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6be0-74af-b41b-dde2423304c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6be0-74af-b41b-dde2423304c4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019c9ac0-6be0-7ecb-b94b-4341005a0512" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_LoansReceivableMember_019c9ac0-6be0-7ecb-b94b-4341005a0512" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7f30-9111-396c408fa7ba" xlink:href="apo-20260331.xsd#apo_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7f30-9111-396c408fa7ba" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019c9ac0-6be0-7a82-acc2-5f85ede4613d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019c9ac0-6be0-7a82-acc2-5f85ede4613d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019c9ac0-6be0-7b1b-a5c2-938310b6af19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019c9ac0-6be0-7b1b-a5c2-938310b6af19" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019c9ac0-6be0-7672-9f2b-d91f4002e68f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019c9ac0-6be0-7672-9f2b-d91f4002e68f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6be0-7f0e-8e38-f12f84c7aad1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6be0-7f0e-8e38-f12f84c7aad1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableMember_019c9ac0-6be0-7c2f-a3d8-a4fe15c63b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_ReinsuranceRecoverableMember_019c9ac0-6be0-7c2f-a3d8-a4fe15c63b5c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_019c9ac0-6be0-77e7-be95-beb12a32692f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7f2c-b724-346988015f72" xlink:to="loc_us-gaap_OtherLiabilitiesMember_019c9ac0-6be0-77e7-be95-beb12a32692f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-737f-a83f-a7ed7b1c70de" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-78a1-9f1c-d331fea483e4" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-737f-a83f-a7ed7b1c70de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-737f-a83f-a7ed7b1c70de_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-737f-a83f-a7ed7b1c70de" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-737f-a83f-a7ed7b1c70de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-77de-86d0-5e2bcbf61ddd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-737f-a83f-a7ed7b1c70de" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-77de-86d0-5e2bcbf61ddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-735e-b05e-837258add153" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-77de-86d0-5e2bcbf61ddd" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-735e-b05e-837258add153" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7eea-ab9e-72576f56ba25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-78a1-9f1c-d331fea483e4" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7eea-ab9e-72576f56ba25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7eea-ab9e-72576f56ba25_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7eea-ab9e-72576f56ba25" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7eea-ab9e-72576f56ba25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7c53-bb84-0d4815411347" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-7eea-ab9e-72576f56ba25" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7c53-bb84-0d4815411347" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-7f31-b03e-ae24805b62f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7c53-bb84-0d4815411347" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-7f31-b03e-ae24805b62f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-77f4-a96c-c0e8b560d506" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-78a1-9f1c-d331fea483e4" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-77f4-a96c-c0e8b560d506" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-77f4-a96c-c0e8b560d506_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-77f4-a96c-c0e8b560d506" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-77f4-a96c-c0e8b560d506_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-77f4-a96c-c0e8b560d506" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ContingentConsiderationMember_019c9ac0-6be0-7413-aeca-27ab37d07987" xlink:href="apo-20260331.xsd#apo_ContingentConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_apo_ContingentConsiderationMember_019c9ac0-6be0-7413-aeca-27ab37d07987" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019c9ac0-6be0-7978-842d-258d4e71bbd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019c9ac0-6be0-7978-842d-258d4e71bbd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019c9ac0-6be0-7d2c-be38-4bf2f92a8b40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_us-gaap_UniversalLifeMember_019c9ac0-6be0-7d2c-be38-4bf2f92a8b40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AmerUsLifeInsuranceCompanyAmerUsClosedBlockMember_019c9ac0-6be0-7e7d-b31f-fbcd347ffab5" xlink:href="apo-20260331.xsd#apo_AmerUsLifeInsuranceCompanyAmerUsClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_apo_AmerUsLifeInsuranceCompanyAmerUsClosedBlockMember_019c9ac0-6be0-7e7d-b31f-fbcd347ffab5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_IndianapolisLifeInsuranceCompanyILICOClosedBlockMember_019c9ac0-6be0-7422-be02-78924c881007" xlink:href="apo-20260331.xsd#apo_IndianapolisLifeInsuranceCompanyILICOClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_apo_IndianapolisLifeInsuranceCompanyILICOClosedBlockMember_019c9ac0-6be0-7422-be02-78924c881007" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019c9ac0-6be0-78c9-aaa7-7630aa65fbff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019c9ac0-6be0-78c9-aaa7-7630aa65fbff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_019c9ac0-6be0-700e-aa09-5cc3e64e0925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_us-gaap_OtherLiabilitiesMember_019c9ac0-6be0-700e-aa09-5cc3e64e0925" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019c9ac0-6be0-72be-a80b-38b6ae65996d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019c9ac0-6be0-72be-a80b-38b6ae65996d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMember_019dd3bc-616e-7da3-b337-4a852daf4bff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-769e-9b95-7feba0d42e3f" xlink:to="loc_us-gaap_LongTermDebtMember_019dd3bc-616e-7da3-b337-4a852daf4bff" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7823-8e96-9f3b11e618f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-78a1-9f1c-d331fea483e4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7823-8e96-9f3b11e618f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7823-8e96-9f3b11e618f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7823-8e96-9f3b11e618f4" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7823-8e96-9f3b11e618f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78f3-9ce6-2e1806629e69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7823-8e96-9f3b11e618f4" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78f3-9ce6-2e1806629e69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7da7-a5de-d902f9073ffd" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78f3-9ce6-2e1806629e69" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-7da7-a5de-d902f9073ffd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-72ea-b0c4-29d929419010" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-78f3-9ce6-2e1806629e69" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-72ea-b0c4-29d929419010" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7350-b560-ee9345768038" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7350-b560-ee9345768038" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019c9ac0-6be0-752b-a112-5232f38f3ed3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7350-b560-ee9345768038" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019c9ac0-6be0-752b-a112-5232f38f3ed3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019c9ac0-6be0-7ef5-a3e2-3c1bfc19c1af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7350-b560-ee9345768038" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019c9ac0-6be0-7ef5-a3e2-3c1bfc19c1af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019c9ac0-6be0-7720-9513-ca6fa684f09a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7350-b560-ee9345768038" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019c9ac0-6be0-7720-9513-ca6fa684f09a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019c9ac0-6be0-7888-9610-c7778680bf5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7350-b560-ee9345768038" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019c9ac0-6be0-7888-9610-c7778680bf5b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019c9ac0-6be0-7323-93f0-2d49c269011b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7350-b560-ee9345768038" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019c9ac0-6be0-7323-93f0-2d49c269011b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019c9ac0-6be0-7bd0-bca9-ee821a8f3700" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019c9ac0-6be0-7b40-8ed9-1205307f47f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019c9ac0-6be0-7b40-8ed9-1205307f47f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019c9ac0-6be0-70bc-b8c9-1f571989436d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019c9ac0-6be0-70bc-b8c9-1f571989436d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7c66-9ec2-020e155ce89b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7c66-9ec2-020e155ce89b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019c9ac0-6be0-7e8b-aa01-317c004c620b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7c66-9ec2-020e155ce89b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019c9ac0-6be0-7e8b-aa01-317c004c620b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019c9ac0-6be0-7259-b552-79185563eae0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7c66-9ec2-020e155ce89b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019c9ac0-6be0-7259-b552-79185563eae0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019c9ac0-6be0-7608-80f7-a91c0ac00aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7c66-9ec2-020e155ce89b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019c9ac0-6be0-7608-80f7-a91c0ac00aa9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019c9ac0-6be0-7ac6-ac41-b70aef6fb2b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7c66-9ec2-020e155ce89b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019c9ac0-6be0-7ac6-ac41-b70aef6fb2b7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019c9ac0-6be0-754e-bda9-5d959f24370f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019c9ac0-6be0-7c66-9ec2-020e155ce89b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019c9ac0-6be0-754e-bda9-5d959f24370f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019c9ac0-6be0-7452-8157-fcf305082b63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019c9ac0-6be0-7e1f-b736-a69a00b5aa7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019c9ac0-6be0-7e1f-b736-a69a00b5aa7a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019c9ac0-6be0-739e-8e8c-b4d005c38b44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019c9ac0-6be0-739e-8e8c-b4d005c38b44" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7e56-b960-45f0f8245633" xlink:href="apo-20260331.xsd#apo_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_apo_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7e56-b960-45f0f8245633" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7257-919a-b88911a756de" xlink:href="apo-20260331.xsd#apo_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_apo_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7257-919a-b88911a756de" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7107-a77e-55b5d56537fe" xlink:href="apo-20260331.xsd#apo_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_apo_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7107-a77e-55b5d56537fe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-78d2-9dae-614255972da5" xlink:href="apo-20260331.xsd#apo_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_apo_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-78d2-9dae-614255972da5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7347-8a17-c135eeb95b6b" xlink:href="apo-20260331.xsd#apo_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-7e5e-ad5f-0a1929777a93" xlink:to="loc_apo_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019c9ac0-6be0-7347-8a17-c135eeb95b6b" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/FairValueScheduleofGrossComponentsofPurchasesIssuancesSalesandSettlementsNetandNetTransfersInOutDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#FairValueScheduleofGrossComponentsofPurchasesIssuancesSalesandSettlementsNetandNetTransfersInOutDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/FairValueScheduleofGrossComponentsofPurchasesIssuancesSalesandSettlementsNetandNetTransfersInOutDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-787c-bf58-9dbb17249897" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-787c-bf58-9dbb17249897" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7739-888c-0876614cf06d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7739-888c-0876614cf06d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7739-888c-0876614cf06d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7739-888c-0876614cf06d" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7739-888c-0876614cf06d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7397-a7f5-bc0ac22b6eaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7739-888c-0876614cf06d" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7397-a7f5-bc0ac22b6eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-78b3-975d-c540d47478fd" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7397-a7f5-bc0ac22b6eaa" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6be0-78b3-975d-c540d47478fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-75fb-8766-e7733ae172c4" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7397-a7f5-bc0ac22b6eaa" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-75fb-8766-e7733ae172c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-77bf-9fe6-105939dea259" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-77bf-9fe6-105939dea259" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-77bf-9fe6-105939dea259_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-77bf-9fe6-105939dea259" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-77bf-9fe6-105939dea259_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7ba1-a092-49a33c8d29c6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c9ac0-6be0-77bf-9fe6-105939dea259" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7ba1-a092-49a33c8d29c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7a0c-b21f-0a4c07928575" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7ba1-a092-49a33c8d29c6" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c9ac0-6be0-7a0c-b21f-0a4c07928575" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019cd76c-3311-7c56-b762-fd919496abcf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c9ac0-6be0-7ba1-a092-49a33c8d29c6" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019cd76c-3311-7c56-b762-fd919496abcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-743e-bd54-a05416098980" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-743e-bd54-a05416098980" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-743e-bd54-a05416098980_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-743e-bd54-a05416098980" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-743e-bd54-a05416098980_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7175-8af4-d5b4cb02480e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-743e-bd54-a05416098980" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7175-8af4-d5b4cb02480e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-7334-b914-baa41bc10fa0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7175-8af4-d5b4cb02480e" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-7334-b914-baa41bc10fa0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7667-b37a-4ecf0ea75d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7667-b37a-4ecf0ea75d7f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7667-b37a-4ecf0ea75d7f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7667-b37a-4ecf0ea75d7f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7667-b37a-4ecf0ea75d7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019c9ac0-6be0-7667-b37a-4ecf0ea75d7f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentsAndDerivativeAssetsMember_019c9ac0-6be0-7209-bd58-38fb2a72f2d4" xlink:href="apo-20260331.xsd#apo_InvestmentsAndDerivativeAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_apo_InvestmentsAndDerivativeAssetsMember_019c9ac0-6be0-7209-bd58-38fb2a72f2d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsMember_019c9ac0-6be0-7f8f-b81d-db023d39fbe5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_InvestmentsMember_019c9ac0-6be0-7f8f-b81d-db023d39fbe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6be0-791c-8ccd-2d7ec6149f79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_DebtSecuritiesMember_019c9ac0-6be0-791c-8ccd-2d7ec6149f79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-7920-be60-8f325e405204" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-7920-be60-8f325e405204" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6be0-7e5d-bfd7-570aa367cd8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_EquitySecuritiesMember_019c9ac0-6be0-7e5d-bfd7-570aa367cd8b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019c9ac0-6be0-77ad-a5d7-eef89bdedcd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_LoansReceivableMember_019c9ac0-6be0-77ad-a5d7-eef89bdedcd8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7540-93b7-0622108cf381" xlink:href="apo-20260331.xsd#apo_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7540-93b7-0622108cf381" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019cd770-2658-7103-981a-233a5cf11ced" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019cd770-2658-7103-981a-233a5cf11ced" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019c9ac0-6be0-73a2-813b-ce77f29fe1a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019c9ac0-6be0-73a2-813b-ce77f29fe1a7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019c9ac0-6be0-7d2a-90bf-d13ab5bc191f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019c9ac0-6be0-7d2a-90bf-d13ab5bc191f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6be0-7afe-970c-fa567488dcfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_OtherInvestmentsMember_019c9ac0-6be0-7afe-970c-fa567488dcfc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableMember_019c9ac0-6be0-7625-b3f8-26f6b7a9e017" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019c9ac0-6be0-7fa8-893c-afdab4d84b74" xlink:to="loc_us-gaap_ReinsuranceRecoverableMember_019c9ac0-6be0-7625-b3f8-26f6b7a9e017" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7c59-bcc5-9159669c0420" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7c59-bcc5-9159669c0420" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7c59-bcc5-9159669c0420_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7c59-bcc5-9159669c0420" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7c59-bcc5-9159669c0420_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7c59-bcc5-9159669c0420" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6be0-7558-9e1b-e2e3c840e0a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c9ac0-6be0-7558-9e1b-e2e3c840e0a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019c9ac0-6be0-7ccb-b3b4-b02cf323e634" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019c9ac0-6be0-7ccb-b3b4-b02cf323e634" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6be0-7e4b-acb9-a2dff2544957" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019c9ac0-6be0-7e4b-acb9-a2dff2544957" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6be0-7cd2-b007-dece536ebf6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019c9ac0-6be0-7cd2-b007-dece536ebf6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6be0-7862-b763-efe856c47ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019c9ac0-6be0-7862-b763-efe856c47ca6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6be0-7097-bb4d-9c9c7713d3b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019c9ac0-6be0-7097-bb4d-9c9c7713d3b8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6be0-7a1b-8ca6-3e122db2ba44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019c9ac0-6be0-7a1b-8ca6-3e122db2ba44" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019c9ac0-6be0-7ebb-a971-d6c8ad25acfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7a12-b4d5-92c488b05870" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019c9ac0-6be0-7ebb-a971-d6c8ad25acfa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7029-ae3a-8d7dbe432846" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7029-ae3a-8d7dbe432846" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7029-ae3a-8d7dbe432846_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7029-ae3a-8d7dbe432846" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7029-ae3a-8d7dbe432846_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7959-8f4b-1d13af3046d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019c9ac0-6be0-7029-ae3a-8d7dbe432846" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7959-8f4b-1d13af3046d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DueToRelatedPartiesMember_019ddc62-9336-7017-a15a-df54e1d6753f" xlink:href="apo-20260331.xsd#apo_DueToRelatedPartiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7959-8f4b-1d13af3046d3" xlink:to="loc_apo_DueToRelatedPartiesMember_019ddc62-9336-7017-a15a-df54e1d6753f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ContingentConsiderationMember_019c9ac0-6be0-789d-a5b7-1586b323076d" xlink:href="apo-20260331.xsd#apo_ContingentConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7959-8f4b-1d13af3046d3" xlink:to="loc_apo_ContingentConsiderationMember_019c9ac0-6be0-789d-a5b7-1586b323076d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestSensitiveContractLiabilitiesMember_019c9ac0-6be0-7085-ab85-4c66ac8c1c3e" xlink:href="apo-20260331.xsd#apo_InterestSensitiveContractLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7959-8f4b-1d13af3046d3" xlink:to="loc_apo_InterestSensitiveContractLiabilitiesMember_019c9ac0-6be0-7085-ab85-4c66ac8c1c3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_019dbd4e-272a-7abe-922e-e8872ed0b37c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7959-8f4b-1d13af3046d3" xlink:to="loc_us-gaap_OtherLiabilitiesMember_019dbd4e-272a-7abe-922e-e8872ed0b37c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMember_019dd3c1-94c9-7c94-910b-530eebda8e50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019c9ac0-6be0-7959-8f4b-1d13af3046d3" xlink:to="loc_us-gaap_LongTermDebtMember_019dd3c1-94c9-7c94-910b-530eebda8e50" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd76c-3311-7bc7-8389-11c86d4ce7d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd76c-3311-7bc7-8389-11c86d4ce7d3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-7bc7-8389-11c86d4ce7d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd76c-3311-7bc7-8389-11c86d4ce7d3" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-7bc7-8389-11c86d4ce7d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-714f-8e8c-95bab28e1880" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cd76c-3311-7bc7-8389-11c86d4ce7d3" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-714f-8e8c-95bab28e1880" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cd76c-3311-70be-a0ea-3fd749f3e6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-714f-8e8c-95bab28e1880" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cd76c-3311-70be-a0ea-3fd749f3e6d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cd76c-3311-728c-96b5-8063494112e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-714f-8e8c-95bab28e1880" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cd76c-3311-728c-96b5-8063494112e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cd76c-3311-7b5e-9f92-33a94d6a5ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-714f-8e8c-95bab28e1880" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cd76c-3311-7b5e-9f92-33a94d6a5ee7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cd76c-3311-79d0-aaf0-02b505a950d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cd76c-3311-714f-8e8c-95bab28e1880" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cd76c-3311-79d0-aaf0-02b505a950d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd76c-3311-720d-9cf3-99b569d451a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019c9ac0-6be0-7076-96ff-12461a1623f9" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd76c-3311-720d-9cf3-99b569d451a6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd76c-3311-720d-9cf3-99b569d451a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd76c-3311-720d-9cf3-99b569d451a6" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd76c-3311-720d-9cf3-99b569d451a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd76c-3311-74fa-ad52-af7e18351d56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019cd76c-3311-720d-9cf3-99b569d451a6" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd76c-3311-74fa-ad52-af7e18351d56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019cd76c-3311-7b0f-8820-dd5022e272dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019cd76c-3311-74fa-ad52-af7e18351d56" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019cd76c-3311-7b0f-8820-dd5022e272dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-7126-b0a1-801c674141ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-787c-bf58-9dbb17249897" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-7126-b0a1-801c674141ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019c9ac0-6be0-7b7d-9f0d-4f7d47d6b5f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-7126-b0a1-801c674141ac" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019c9ac0-6be0-7b7d-9f0d-4f7d47d6b5f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019c9ac0-6be0-7ebe-8312-4be7ccd1231e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-7126-b0a1-801c674141ac" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019c9ac0-6be0-7ebe-8312-4be7ccd1231e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019c9ac0-6be0-7de7-a503-66ed4347a503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-7126-b0a1-801c674141ac" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019c9ac0-6be0-7de7-a503-66ed4347a503" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019c9ac0-6be0-7497-815f-fd578df35fe3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-7126-b0a1-801c674141ac" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019c9ac0-6be0-7497-815f-fd578df35fe3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019c9ac0-6be0-7a22-8a9d-06425bd4e86d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-7126-b0a1-801c674141ac" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019c9ac0-6be0-7a22-8a9d-06425bd4e86d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetAbstract_019c9ac0-6be0-7a56-a3bf-47eb64cb94ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-787c-bf58-9dbb17249897" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetAbstract_019c9ac0-6be0-7a56-a3bf-47eb64cb94ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019c9ac0-6be0-7aac-8090-691c2ce34796" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetAbstract_019c9ac0-6be0-7a56-a3bf-47eb64cb94ca" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019c9ac0-6be0-7aac-8090-691c2ce34796" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019c9ac0-6be0-7593-b8dc-925a210f7e4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetAbstract_019c9ac0-6be0-7a56-a3bf-47eb64cb94ca" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019c9ac0-6be0-7593-b8dc-925a210f7e4d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019c9ac0-6be0-7b86-8e1a-5ef6cc51aa19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNetAbstract_019c9ac0-6be0-7a56-a3bf-47eb64cb94ca" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019c9ac0-6be0-7b86-8e1a-5ef6cc51aa19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-74ff-ac7a-84e0f75ef951" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-787c-bf58-9dbb17249897" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-74ff-ac7a-84e0f75ef951" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019c9ac0-6be0-7e78-ab16-c4cb44bae89c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-74ff-ac7a-84e0f75ef951" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019c9ac0-6be0-7e78-ab16-c4cb44bae89c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_019c9ac0-6be0-79c7-8463-94319568feab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-74ff-ac7a-84e0f75ef951" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_019c9ac0-6be0-79c7-8463-94319568feab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019c9ac0-6be0-7ce6-9b1d-572c9c66d496" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-74ff-ac7a-84e0f75ef951" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019c9ac0-6be0-7ce6-9b1d-572c9c66d496" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019c9ac0-6be0-7d69-92ee-12d3dc40c255" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-74ff-ac7a-84e0f75ef951" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019c9ac0-6be0-7d69-92ee-12d3dc40c255" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019c9ac0-6be0-75f9-8f9e-c478165d40b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_019c9ac0-6be0-74ff-ac7a-84e0f75ef951" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019c9ac0-6be0-75f9-8f9e-c478165d40b0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNetAbstract_019c9ac0-6be0-7806-b76e-58300750024e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019c9ac0-6be0-787c-bf58-9dbb17249897" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNetAbstract_019c9ac0-6be0-7806-b76e-58300750024e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019cd774-6cf2-78f7-b1a2-556fe9dc383f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNetAbstract_019c9ac0-6be0-7806-b76e-58300750024e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019cd774-6cf2-78f7-b1a2-556fe9dc383f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019cd774-a9a0-7f95-b3f7-63f642fac72d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNetAbstract_019c9ac0-6be0-7806-b76e-58300750024e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019cd774-a9a0-7f95-b3f7-63f642fac72d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019cd774-f0c2-7edc-80a6-1657627a9a39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNetAbstract_019c9ac0-6be0-7806-b76e-58300750024e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019cd774-f0c2-7edc-80a6-1657627a9a39" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/FairValueScheduleofGainLossesRecordedforFinancialInstrumentsElectedtheFairValueOptionDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#FairValueScheduleofGainLossesRecordedforFinancialInstrumentsElectedtheFairValueOptionDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/FairValueScheduleofGainLossesRecordedforFinancialInstrumentsElectedtheFairValueOptionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7f1e-8841-d26e01e60dc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-7ed6-9ac1-f9648a0029a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7f1e-8841-d26e01e60dc1" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-7ed6-9ac1-f9648a0029a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7515-ae34-711ade0dfa1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-7ed6-9ac1-f9648a0029a8" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7515-ae34-711ade0dfa1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7515-ae34-711ade0dfa1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7515-ae34-711ade0dfa1c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7515-ae34-711ade0dfa1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-769a-9de9-02a226d825ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7515-ae34-711ade0dfa1c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-769a-9de9-02a226d825ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-75a7-876b-2225fe1d6459" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-769a-9de9-02a226d825ec" xlink:to="loc_us-gaap_TradingAssetsExcludingDebtAndEquitySecuritiesMember_019c9ac0-6be0-75a7-876b-2225fe1d6459" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019c9ac0-6be0-78ac-bb54-1f36cbc8db1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-769a-9de9-02a226d825ec" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019c9ac0-6be0-78ac-bb54-1f36cbc8db1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7ba0-9fc2-45066d154359" xlink:href="apo-20260331.xsd#apo_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-769a-9de9-02a226d825ec" xlink:to="loc_apo_InvestmentFundsMember_019c9ac0-6be0-7ba0-9fc2-45066d154359" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FuturePolicyBenefitsMember_019c9ac0-6be0-7cb0-a9e0-f2de824dda33" xlink:href="apo-20260331.xsd#apo_FuturePolicyBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-769a-9de9-02a226d825ec" xlink:to="loc_apo_FuturePolicyBenefitsMember_019c9ac0-6be0-7cb0-a9e0-f2de824dda33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_019c9ac0-6be0-73d4-86da-4f5d706fc7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-769a-9de9-02a226d825ec" xlink:to="loc_us-gaap_OtherLiabilitiesMember_019c9ac0-6be0-73d4-86da-4f5d706fc7ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7c39-bf2c-07d3f517b12b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-7ed6-9ac1-f9648a0029a8" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7c39-bf2c-07d3f517b12b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7c39-bf2c-07d3f517b12b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7c39-bf2c-07d3f517b12b" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7c39-bf2c-07d3f517b12b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7462-ab57-079f8fd22a50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-7c39-bf2c-07d3f517b12b" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7462-ab57-079f8fd22a50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-7823-8bd3-63b5ad0901b9" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7462-ab57-079f8fd22a50" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-7823-8bd3-63b5ad0901b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_019c9ac0-6be0-7e09-839c-60cd0ad98dd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionChangesInFairValueGainLoss1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7f1e-8841-d26e01e60dc1" xlink:to="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_019c9ac0-6be0-7e09-839c-60cd0ad98dd9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/FairValueScheduleofFairValueOptionMortgageLoansDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#FairValueScheduleofFairValueOptionMortgageLoansDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/FairValueScheduleofFairValueOptionMortgageLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-775c-896b-80471a59856c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-775c-896b-80471a59856c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7311-95d6-9d38ccfa0893" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-775c-896b-80471a59856c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7311-95d6-9d38ccfa0893" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7311-95d6-9d38ccfa0893_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7311-95d6-9d38ccfa0893" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7311-95d6-9d38ccfa0893_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7ae6-b47e-b5626756a332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c9ac0-6be0-7311-95d6-9d38ccfa0893" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7ae6-b47e-b5626756a332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MortgageLoansMember_019c9ac0-6be0-7cca-a227-3cb0fe52177a" xlink:href="apo-20260331.xsd#apo_MortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7ae6-b47e-b5626756a332" xlink:to="loc_apo_MortgageLoansMember_019c9ac0-6be0-7cca-a227-3cb0fe52177a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_CommercialMortgageMember_019c9ac0-6be0-7a35-83e6-2c7f090cba02" xlink:href="apo-20260331.xsd#apo_CommercialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7ae6-b47e-b5626756a332" xlink:to="loc_apo_CommercialMortgageMember_019c9ac0-6be0-7a35-83e6-2c7f090cba02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_019c9ac0-6be0-7ef8-9b0b-f1893000309a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c9ac0-6be0-7ae6-b47e-b5626756a332" xlink:to="loc_us-gaap_ResidentialMortgageMember_019c9ac0-6be0-7ef8-9b0b-f1893000309a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_019c9ac0-6be0-7978-82b0-ee4bafdb5b18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c9ac0-6be0-775c-896b-80471a59856c" xlink:to="loc_us-gaap_CollateralAxis_019c9ac0-6be0-7978-82b0-ee4bafdb5b18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019c9ac0-6be0-7978-82b0-ee4bafdb5b18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_019c9ac0-6be0-7978-82b0-ee4bafdb5b18" xlink:to="loc_us-gaap_CollateralDomain_019c9ac0-6be0-7978-82b0-ee4bafdb5b18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019c9ac0-6be0-79b1-b2f4-5d056ed047f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_019c9ac0-6be0-7978-82b0-ee4bafdb5b18" xlink:to="loc_us-gaap_CollateralDomain_019c9ac0-6be0-79b1-b2f4-5d056ed047f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentGuaranteedCollateralMember_019c9ac0-6be0-7b6b-a50d-4268406f3bf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GovernmentGuaranteedCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_019c9ac0-6be0-79b1-b2f4-5d056ed047f6" xlink:to="loc_us-gaap_GovernmentGuaranteedCollateralMember_019c9ac0-6be0-7b6b-a50d-4268406f3bf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance_019c9ac0-6be0-79cb-b73b-436d92972a30" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssetsUnpaidPrincipalBalance_019c9ac0-6be0-79cb-b73b-436d92972a30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssetsMarkToFairValue_019c9ac0-6be0-725d-9525-51b1afb2c955" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssetsMarkToFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssetsMarkToFairValue_019c9ac0-6be0-725d-9525-51b1afb2c955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssets_019c9ac0-6be0-78c7-ac0a-3dfbd0950343" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssets_019c9ac0-6be0-78c7-ac0a-3dfbd0950343" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAndOrInNonaccrualStatusFairValue_019c9ac0-6be0-7036-939a-f95f0a9481af" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAndOrInNonaccrualStatusFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAndOrInNonaccrualStatusFairValue_019c9ac0-6be0-7036-939a-f95f0a9481af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAndOrInNonaccrualStatusUnpaidPrincipal_019c9ac0-6be0-73b4-aa30-6ce502527208" xlink:href="apo-20260331.xsd#apo_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAndOrInNonaccrualStatusUnpaidPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_apo_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDueAndOrInNonaccrualStatusUnpaidPrincipal_019c9ac0-6be0-73b4-aa30-6ce502527208" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference_019c9ac0-6be0-7b04-8544-44bf442d66be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference_019c9ac0-6be0-7b04-8544-44bf442d66be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue_019c9ac0-6be0-7032-b3f2-eeb81c42e800" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue_019c9ac0-6be0-7032-b3f2-eeb81c42e800" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus_019c9ac0-6be0-7858-997e-7f87a219f19f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus_019c9ac0-6be0-7858-997e-7f87a219f19f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets_019c9ac0-6be0-7eda-aaef-4d23066fd425" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c9ac0-6be0-7561-8482-7de31023785f" xlink:to="loc_us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets_019c9ac0-6be0-7eda-aaef-4d23066fd425" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/FairValueScheduleofFinancialInstrumentsNotCarriedatFairValueDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#FairValueScheduleofFinancialInstrumentsNotCarriedatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/FairValueScheduleofFinancialInstrumentsNotCarriedatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_019c9ac0-6be0-7cf7-b1a0-1763cf9d5a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_019c9ac0-6be0-7cf7-b1a0-1763cf9d5a6d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019c9ac0-6be0-751e-bd8d-ea875ae68e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_019c9ac0-6be0-7cf7-b1a0-1763cf9d5a6d" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019c9ac0-6be0-751e-bd8d-ea875ae68e3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c9ac0-6be0-751e-bd8d-ea875ae68e3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019c9ac0-6be0-751e-bd8d-ea875ae68e3d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c9ac0-6be0-751e-bd8d-ea875ae68e3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c9ac0-6be0-750b-aee1-bb6116ff562b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019c9ac0-6be0-751e-bd8d-ea875ae68e3d" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c9ac0-6be0-750b-aee1-bb6116ff562b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c9ac0-6be0-7238-bf27-7bff07b5c171" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c9ac0-6be0-750b-aee1-bb6116ff562b" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c9ac0-6be0-7238-bf27-7bff07b5c171" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019c9ac0-6be0-76bc-8fdb-ad4e67d9e53f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c9ac0-6be0-7238-bf27-7bff07b5c171" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019c9ac0-6be0-76bc-8fdb-ad4e67d9e53f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019c9ac0-6be0-7b17-801c-78a9d7009b59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c9ac0-6be0-7238-bf27-7bff07b5c171" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019c9ac0-6be0-7b17-801c-78a9d7009b59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-71de-8982-cd96dd9c7da9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_019c9ac0-6be0-7cf7-b1a0-1763cf9d5a6d" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-71de-8982-cd96dd9c7da9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-71de-8982-cd96dd9c7da9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-71de-8982-cd96dd9c7da9" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-71de-8982-cd96dd9c7da9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7b95-8af1-d23ba5d4aa5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6be0-71de-8982-cd96dd9c7da9" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7b95-8af1-d23ba5d4aa5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6be0-7841-81d3-c9b593caa07f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7b95-8af1-d23ba5d4aa5b" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c9ac0-6be0-7841-81d3-c9b593caa07f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-7092-b132-0d77910ff86b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6be0-7b95-8af1-d23ba5d4aa5b" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6be0-7092-b132-0d77910ff86b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-75be-84f5-c123c96ec2ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_019c9ac0-6be0-7cf7-b1a0-1763cf9d5a6d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-75be-84f5-c123c96ec2ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-75be-84f5-c123c96ec2ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-75be-84f5-c123c96ec2ea" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-75be-84f5-c123c96ec2ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7eb5-a57a-0ab17a6bc1dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6be0-75be-84f5-c123c96ec2ea" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7eb5-a57a-0ab17a6bc1dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-72e4-b11e-7ef0461b1d68" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6be0-7eb5-a57a-0ab17a6bc1dc" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6be0-72e4-b11e-7ef0461b1d68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7a71-b6d8-0747cc1196a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_019c9ac0-6be0-7cf7-b1a0-1763cf9d5a6d" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7a71-b6d8-0747cc1196a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-7a71-b6d8-0747cc1196a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7a71-b6d8-0747cc1196a0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-7a71-b6d8-0747cc1196a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-792c-9f8d-37fb4c0554f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c9ac0-6be0-7a71-b6d8-0747cc1196a0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-792c-9f8d-37fb4c0554f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019c9ac0-6be0-731d-a549-76baaa879de3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-792c-9f8d-37fb4c0554f0" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019c9ac0-6be0-731d-a549-76baaa879de3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019c9ac0-6be0-79c1-9911-86fdcd19857b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-792c-9f8d-37fb4c0554f0" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019c9ac0-6be0-79c1-9911-86fdcd19857b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c9ac0-6be0-7014-beb2-b7c748359eee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-792c-9f8d-37fb4c0554f0" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c9ac0-6be0-7014-beb2-b7c748359eee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c9ac0-6be0-71a0-970e-40be2a7980b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c9ac0-6be0-792c-9f8d-37fb4c0554f0" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c9ac0-6be0-71a0-970e-40be2a7980b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019cd781-b1ed-7be5-979e-329bb42d1bbe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_019c9ac0-6be0-7cf7-b1a0-1763cf9d5a6d" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019cd781-b1ed-7be5-979e-329bb42d1bbe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019cd781-b1ed-7be5-979e-329bb42d1bbe_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019cd781-b1ed-7be5-979e-329bb42d1bbe" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019cd781-b1ed-7be5-979e-329bb42d1bbe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019cd781-b1ed-758f-b78b-2beb9cf2db58" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019cd781-b1ed-7be5-979e-329bb42d1bbe" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019cd781-b1ed-758f-b78b-2beb9cf2db58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019cd781-b1ed-7675-a258-0dfbae46e803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019cd781-b1ed-758f-b78b-2beb9cf2db58" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019cd781-b1ed-7675-a258-0dfbae46e803" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsFairValueDisclosure_019c9ac0-6be0-7be0-97a4-98639791c281" xlink:href="apo-20260331.xsd#apo_InvestmentFundsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_apo_InvestmentFundsFairValueDisclosure_019c9ac0-6be0-7be0-97a4-98639791c281" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019c9ac0-6be0-716c-b54c-fca34f8f5413" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019c9ac0-6be0-716c-b54c-fca34f8f5413" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019c9ac0-6be0-7a62-a97e-eff0dfa6d751" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019c9ac0-6be0-7a62-a97e-eff0dfa6d751" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShortTermInvestmentsFairValueDisclosure_019c9ac0-6be0-7bae-b88d-75b890a5390e" xlink:href="apo-20260331.xsd#apo_ShortTermInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_apo_ShortTermInvestmentsFairValueDisclosure_019c9ac0-6be0-7bae-b88d-75b890a5390e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherInvestmentsFairValueDisclosure_019c9ac0-6be0-7b53-bdfa-4e1358f8c0ff" xlink:href="apo-20260331.xsd#apo_OtherInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_apo_OtherInvestmentsFairValueDisclosure_019c9ac0-6be0-7b53-bdfa-4e1358f8c0ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019c9ac0-6be0-7f0c-80e0-36d6fdf01161" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019c9ac0-6be0-7f0c-80e0-36d6fdf01161" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure_019c9ac0-6be0-7322-b500-212882070580" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure_019c9ac0-6be0-7322-b500-212882070580" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019c9ac0-6be0-717c-b03a-745009093bb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019c9ac0-6be0-717c-b03a-745009093bb2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure_019c9ac0-6be0-78fd-b419-561146275c34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure_019c9ac0-6be0-78fd-b419-561146275c34" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019c9ac0-6be0-75b5-8081-37318c5e0d6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019c9ac0-6be0-75b5-8081-37318c5e0d6f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019c9ac0-6be0-7b47-be63-0eddbd055829" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_019c9ac0-6be0-7621-91a4-c3be6518140d" xlink:to="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019c9ac0-6be0-7b47-be63-0eddbd055829" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DeferredAcquisitionCostsDeferredSalesInducementsandValueofBusinessAcquiredScheduleofRollforwardofDACDSIandVOBADetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DeferredAcquisitionCostsDeferredSalesInducementsandValueofBusinessAcquiredScheduleofRollforwardofDACDSIandVOBADetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DeferredAcquisitionCostsDeferredSalesInducementsandValueofBusinessAcquiredScheduleofRollforwardofDACDSIandVOBADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentLineItems_019c9ac0-6be0-796b-9c5c-ed12a14be3db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentTable_019c9ac0-6be0-78c4-a53d-91a09edf9f37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentLineItems_019c9ac0-6be0-796b-9c5c-ed12a14be3db" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentTable_019c9ac0-6be0-78c4-a53d-91a09edf9f37" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6be0-7f33-979a-c2156444cb4b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentTable_019c9ac0-6be0-78c4-a53d-91a09edf9f37" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6be0-7f33-979a-c2156444cb4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7f33-979a-c2156444cb4b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6be0-7f33-979a-c2156444cb4b" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7f33-979a-c2156444cb4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7314-8b4a-14d45a3c2798" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6be0-7f33-979a-c2156444cb4b" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7314-8b4a-14d45a3c2798" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6be0-71b1-a905-275f7b10966d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7314-8b4a-14d45a3c2798" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6be0-71b1-a905-275f7b10966d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6be0-7273-b169-64a5cecd674b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7314-8b4a-14d45a3c2798" xlink:to="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6be0-7273-b169-64a5cecd674b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementsMember_019c9ac0-6be0-77f1-b252-abe61774b27a" xlink:href="apo-20260331.xsd#apo_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7314-8b4a-14d45a3c2798" xlink:to="loc_apo_FundingAgreementsMember_019c9ac0-6be0-77f1-b252-abe61774b27a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherInvestmentTypesAndOtherMember_019c9ac0-6be0-7592-8e51-64107cc7f1bd" xlink:href="apo-20260331.xsd#apo_OtherInvestmentTypesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6be0-7314-8b4a-14d45a3c2798" xlink:to="loc_apo_OtherInvestmentTypesAndOtherMember_019c9ac0-6be0-7592-8e51-64107cc7f1bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019c9ac0-6be0-7675-82df-363f518c6e81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentLineItems_019c9ac0-6be0-796b-9c5c-ed12a14be3db" xlink:to="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019c9ac0-6be0-7675-82df-363f518c6e81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_019c9ac0-6be0-78ea-8ac5-19ce25870fc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019c9ac0-6be0-7675-82df-363f518c6e81" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCosts_019c9ac0-6be0-78ea-8ac5-19ce25870fc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_019c9ac0-6be0-73de-805a-c31abec128cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019c9ac0-6be0-7675-82df-363f518c6e81" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_019c9ac0-6be0-73de-805a-c31abec128cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019c9ac0-6be0-7389-8c9c-28dd2ad89209" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019c9ac0-6be0-7675-82df-363f518c6e81" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019c9ac0-6be0-7389-8c9c-28dd2ad89209" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DeferredPolicyAcquisitionCostsOther_019c9ac0-6be0-7722-aafd-4bfa87e0bded" xlink:href="apo-20260331.xsd#apo_DeferredPolicyAcquisitionCostsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019c9ac0-6be0-7675-82df-363f518c6e81" xlink:to="loc_apo_DeferredPolicyAcquisitionCostsOther_019c9ac0-6be0-7722-aafd-4bfa87e0bded" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_019c9ac0-6be0-7795-8f59-c6a4007d2f69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019c9ac0-6be0-718d-8d96-9263bd9dde1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInDeferredSalesInducementsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentLineItems_019c9ac0-6be0-796b-9c5c-ed12a14be3db" xlink:to="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019c9ac0-6be0-718d-8d96-9263bd9dde1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_019c9ac0-6be0-7251-b89b-c84f9aa5c8b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019c9ac0-6be0-718d-8d96-9263bd9dde1c" xlink:to="loc_us-gaap_DeferredSalesInducementsNet_019c9ac0-6be0-7251-b89b-c84f9aa5c8b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAdditions_019c9ac0-6be0-7dde-af03-f637176f08f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019c9ac0-6be0-718d-8d96-9263bd9dde1c" xlink:to="loc_us-gaap_DeferredSalesInducementsAdditions_019c9ac0-6be0-7dde-af03-f637176f08f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019c9ac0-6be0-74a5-9dd8-1fdd6cde28d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019c9ac0-6be0-718d-8d96-9263bd9dde1c" xlink:to="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019c9ac0-6be0-74a5-9dd8-1fdd6cde28d8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAdjustments_019c9ac0-6be0-764f-bdd7-522076724e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019c9ac0-6be0-718d-8d96-9263bd9dde1c" xlink:to="loc_us-gaap_DeferredSalesInducementsAdjustments_019c9ac0-6be0-764f-bdd7-522076724e7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_019c9ac0-6be0-7b47-a3d5-36247d5d4c96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019c9ac0-6be0-7c68-a381-904d11134517" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentLineItems_019c9ac0-6be0-796b-9c5c-ed12a14be3db" xlink:to="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019c9ac0-6be0-7c68-a381-904d11134517" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019c9ac0-6be0-7f1d-ab23-b4b3dcc6670c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019c9ac0-6be0-7c68-a381-904d11134517" xlink:to="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019c9ac0-6be0-7f1d-ab23-b4b3dcc6670c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAdditionsFromAcquisitions_019c9ac0-6be0-7623-9281-40bfef966506" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsAdditionsFromAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019c9ac0-6be0-7c68-a381-904d11134517" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAdditionsFromAcquisitions_019c9ac0-6be0-7623-9281-40bfef966506" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019c9ac0-6be0-7e2c-89c8-e077f3039a46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019c9ac0-6be0-7c68-a381-904d11134517" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019c9ac0-6be0-7e2c-89c8-e077f3039a46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PresentValueOfFutureInsuranceProfitsOther_019c9ac0-6be0-707e-a898-f6aa6bd02317" xlink:href="apo-20260331.xsd#apo_PresentValueOfFutureInsuranceProfitsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019c9ac0-6be0-7c68-a381-904d11134517" xlink:to="loc_apo_PresentValueOfFutureInsuranceProfitsOther_019c9ac0-6be0-707e-a898-f6aa6bd02317" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019c9ac0-6be0-7066-b3bf-63710f4727c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MovementInDeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetRollForward_019c9ac0-6be0-768a-90e1-7987a43c1eed" xlink:href="apo-20260331.xsd#apo_MovementInDeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitByProductSegmentLineItems_019c9ac0-6be0-796b-9c5c-ed12a14be3db" xlink:to="loc_apo_MovementInDeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetRollForward_019c9ac0-6be0-768a-90e1-7987a43c1eed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet_019c9ac0-6be0-7291-9f36-87eb4ce6b53a" xlink:href="apo-20260331.xsd#apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_MovementInDeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetRollForward_019c9ac0-6be0-768a-90e1-7987a43c1eed" xlink:to="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet_019c9ac0-6be0-7291-9f36-87eb4ce6b53a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetCapitalization_019c9ac0-6be0-7eea-8302-86f0c80e54db" xlink:href="apo-20260331.xsd#apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetCapitalization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_MovementInDeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetRollForward_019c9ac0-6be0-768a-90e1-7987a43c1eed" xlink:to="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetCapitalization_019c9ac0-6be0-7eea-8302-86f0c80e54db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetAmortizationExpense_019c9ac0-6be0-7125-92f4-066a1582b615" xlink:href="apo-20260331.xsd#apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_MovementInDeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetRollForward_019c9ac0-6be0-768a-90e1-7987a43c1eed" xlink:to="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetAmortizationExpense_019c9ac0-6be0-7125-92f4-066a1582b615" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetOther_019c9ac0-6be0-7ce1-9d94-8992287aa098" xlink:href="apo-20260331.xsd#apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_MovementInDeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetRollForward_019c9ac0-6be0-768a-90e1-7987a43c1eed" xlink:to="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNetOther_019c9ac0-6be0-7ce1-9d94-8992287aa098" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet_019c9ac0-6be0-78cb-94aa-a68c43af1f1e" xlink:href="apo-20260331.xsd#apo_DeferredPolicyAcquisitionCostsDeferredSalesInducementCostsAndPresentValueOfFutureInsuranceProfitsNet"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofRollforwardofPolicyholderAccountBalanceDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofRollforwardofPolicyholderAccountBalanceDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofRollforwardofPolicyholderAccountBalanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-787f-81c2-9531006061af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7300-951b-abcdadae1a4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-787f-81c2-9531006061af" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7300-951b-abcdadae1a4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7c80-bda8-61159dcad539" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7300-951b-abcdadae1a4f" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7c80-bda8-61159dcad539" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7c80-bda8-61159dcad539_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7c80-bda8-61159dcad539" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7c80-bda8-61159dcad539_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d68-a17b-5c5367492bb6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7c80-bda8-61159dcad539" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d68-a17b-5c5367492bb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-7739-97be-f0659b060514" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d68-a17b-5c5367492bb6" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-7739-97be-f0659b060514" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7b74-96eb-47ef44c34144" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d68-a17b-5c5367492bb6" xlink:to="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7b74-96eb-47ef44c34144" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementsMember_019c9ac0-6c9f-779d-a2ed-18b9b0e9772f" xlink:href="apo-20260331.xsd#apo_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d68-a17b-5c5367492bb6" xlink:to="loc_apo_FundingAgreementsMember_019c9ac0-6c9f-779d-a2ed-18b9b0e9772f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherInvestmentTypesAndOtherMember_019c9ac0-6c9f-75e8-bf33-5adc9ec73544" xlink:href="apo-20260331.xsd#apo_OtherInvestmentTypesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d68-a17b-5c5367492bb6" xlink:to="loc_apo_OtherInvestmentTypesAndOtherMember_019c9ac0-6c9f-75e8-bf33-5adc9ec73544" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-787f-81c2-9531006061af" xlink:to="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019c9ac0-6c9f-7ba4-ac92-2bc6689c812a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_us-gaap_PolicyholderFunds_019c9ac0-6c9f-7ba4-ac92-2bc6689c812a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIssuance_019c9ac0-6c9f-783f-a8e1-bf2278a47172" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIssuance_019c9ac0-6c9f-783f-a8e1-bf2278a47172" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_019c9ac0-6c9f-7e56-82fa-0f9d12684693" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalancePolicyCharge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_019c9ac0-6c9f-7e56-82fa-0f9d12684693" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_019c9ac0-6c9f-7261-abbe-693c4cfc7050" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_019c9ac0-6c9f-7261-abbe-693c4cfc7050" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_019c9ac0-6c9f-72b1-9021-f8eef52a1c63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_019c9ac0-6c9f-72b1-9021-f8eef52a1c63" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_019c9ac0-6c9f-7ba6-bf67-7e235a36ce25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestCreditedToPolicyholdersAccountBalances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_019c9ac0-6c9f-7ba6-bf67-7e235a36ce25" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceForeignExchange_019c9ac0-6c9f-7b76-9b49-d8bf4d245ffb" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_apo_PolicyholderAccountBalanceForeignExchange_019c9ac0-6c9f-7b76-9b49-d8bf4d245ffb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_019c9ac0-6c9f-77d4-8074-1c32d67bf380" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019c9ac0-6c9f-74a3-a338-f44e3044f32e" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_019c9ac0-6c9f-77d4-8074-1c32d67bf380" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019c9ac0-6c9f-72e0-9106-1e99f08e490c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_019c9ac0-6c9f-746b-a1ff-6fc5db72b558" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-787f-81c2-9531006061af" xlink:to="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_019c9ac0-6c9f-746b-a1ff-6fc5db72b558" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019c9ac0-6c9f-7621-b14b-65ed25827070" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-787f-81c2-9531006061af" xlink:to="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019c9ac0-6c9f-7621-b14b-65ed25827070" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_019c9ac0-6c9f-77fb-b61c-341d342a026f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashSurrenderValueDuePolicyholdersAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-787f-81c2-9531006061af" xlink:to="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_019c9ac0-6c9f-77fb-b61c-341d342a026f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofReconciliationofInterestSensitiveContractLiabilitiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofReconciliationofInterestSensitiveContractLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofReconciliationofInterestSensitiveContractLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7296-a0df-028bda33ee0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7341-aa10-a360af0d730a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7296-a0df-028bda33ee0b" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7341-aa10-a360af0d730a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7deb-9e19-4cf432761ea1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7341-aa10-a360af0d730a" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7deb-9e19-4cf432761ea1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7deb-9e19-4cf432761ea1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7deb-9e19-4cf432761ea1" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7deb-9e19-4cf432761ea1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e8f-a340-eaa7d35b9f96" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7deb-9e19-4cf432761ea1" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e8f-a340-eaa7d35b9f96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-73fe-abc1-02ac285889b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e8f-a340-eaa7d35b9f96" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-73fe-abc1-02ac285889b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7540-8008-a5ec193ca87a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e8f-a340-eaa7d35b9f96" xlink:to="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7540-8008-a5ec193ca87a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementsMember_019c9ac0-6c9f-7aeb-b81f-e521593908c2" xlink:href="apo-20260331.xsd#apo_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e8f-a340-eaa7d35b9f96" xlink:to="loc_apo_FundingAgreementsMember_019c9ac0-6c9f-7aeb-b81f-e521593908c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherInvestmentTypesAndOtherMember_019c9ac0-6c9f-7bc1-8e0c-c47c5f6bd2f4" xlink:href="apo-20260331.xsd#apo_OtherInvestmentTypesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e8f-a340-eaa7d35b9f96" xlink:to="loc_apo_OtherInvestmentTypesAndOtherMember_019c9ac0-6c9f-7bc1-8e0c-c47c5f6bd2f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ReconcilingItemsMember_019c9ac0-6c9f-75cd-a9db-da5e8748be80" xlink:href="apo-20260331.xsd#apo_ReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e8f-a340-eaa7d35b9f96" xlink:to="loc_apo_ReconcilingItemsMember_019c9ac0-6c9f-75cd-a9db-da5e8748be80" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019c9ac0-6c9f-79ba-803a-9b20743f1056" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7296-a0df-028bda33ee0b" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019c9ac0-6c9f-79ba-803a-9b20743f1056" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofPolicyholderAccountBalanceGuaranteedMinimumCreditingRateDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofPolicyholderAccountBalanceGuaranteedMinimumCreditingRateDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofPolicyholderAccountBalanceGuaranteedMinimumCreditingRateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-7949-a2a7-1911612b9732" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7f1c-a715-bdade9f41b41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-7949-a2a7-1911612b9732" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7f1c-a715-bdade9f41b41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c9ac0-6c9f-7541-bf53-81093ddeb2a9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7f1c-a715-bdade9f41b41" xlink:to="loc_srt_RangeAxis_019c9ac0-6c9f-7541-bf53-81093ddeb2a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6c9f-7541-bf53-81093ddeb2a9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c9ac0-6c9f-7541-bf53-81093ddeb2a9" xlink:to="loc_srt_RangeMember_019c9ac0-6c9f-7541-bf53-81093ddeb2a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6c9f-70c6-b32c-d3bcb2d8a563" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c9ac0-6c9f-7541-bf53-81093ddeb2a9" xlink:to="loc_srt_RangeMember_019c9ac0-6c9f-70c6-b32c-d3bcb2d8a563" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c9ac0-6c9f-7cb6-8096-b888d13d6342" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6c9f-70c6-b32c-d3bcb2d8a563" xlink:to="loc_srt_MinimumMember_019c9ac0-6c9f-7cb6-8096-b888d13d6342" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c9ac0-6c9f-74b6-a2b3-06689a3b50d0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6c9f-70c6-b32c-d3bcb2d8a563" xlink:to="loc_srt_MaximumMember_019c9ac0-6c9f-74b6-a2b3-06689a3b50d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019c9ac0-6c9f-7dd8-90df-d0a47078603b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7f1c-a715-bdade9f41b41" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019c9ac0-6c9f-7dd8-90df-d0a47078603b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019c9ac0-6c9f-7dd8-90df-d0a47078603b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019c9ac0-6c9f-7dd8-90df-d0a47078603b" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019c9ac0-6c9f-7dd8-90df-d0a47078603b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019c9ac0-6c9f-7969-9c48-4c754e04a828" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019c9ac0-6c9f-7dd8-90df-d0a47078603b" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019c9ac0-6c9f-7969-9c48-4c754e04a828" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceTotalGuaranteedMinimumCreditRateMember_019c9ac0-6c9f-767d-96a9-f013969aca65" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceTotalGuaranteedMinimumCreditRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019c9ac0-6c9f-7969-9c48-4c754e04a828" xlink:to="loc_apo_PolicyholderAccountBalanceTotalGuaranteedMinimumCreditRateMember_019c9ac0-6c9f-767d-96a9-f013969aca65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_019c9ac0-6c9f-76f1-bbff-a68294d545e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_PolicyholderAccountBalanceTotalGuaranteedMinimumCreditRateMember_019c9ac0-6c9f-767d-96a9-f013969aca65" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_019c9ac0-6c9f-76f1-bbff-a68294d545e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0100Member_019c9ac0-6c9f-7ee7-bf22-2136ecdb3633" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0100Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_PolicyholderAccountBalanceTotalGuaranteedMinimumCreditRateMember_019c9ac0-6c9f-767d-96a9-f013969aca65" xlink:to="loc_apo_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0100Member_019c9ac0-6c9f-7ee7-bf22-2136ecdb3633" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0100AndGreaterMember_019c9ac0-6c9f-7e1d-8b40-cdc66f1fd078" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0100AndGreaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_PolicyholderAccountBalanceTotalGuaranteedMinimumCreditRateMember_019c9ac0-6c9f-767d-96a9-f013969aca65" xlink:to="loc_apo_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0100AndGreaterMember_019c9ac0-6c9f-7e1d-8b40-cdc66f1fd078" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceNoGuaranteedMinimumCreditRateMember_019c9ac0-6c9f-7a22-8d4e-1542d27701a3" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceNoGuaranteedMinimumCreditRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019c9ac0-6c9f-7969-9c48-4c754e04a828" xlink:to="loc_apo_PolicyholderAccountBalanceNoGuaranteedMinimumCreditRateMember_019c9ac0-6c9f-7a22-8d4e-1542d27701a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7b75-986d-194ad3f5da95" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7f1c-a715-bdade9f41b41" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7b75-986d-194ad3f5da95" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7b75-986d-194ad3f5da95_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7b75-986d-194ad3f5da95" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7b75-986d-194ad3f5da95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-77f1-bedf-8458da31b5f8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7b75-986d-194ad3f5da95" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-77f1-bedf-8458da31b5f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-7e28-94b7-5f7bde14d079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-77f1-bedf-8458da31b5f8" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-7e28-94b7-5f7bde14d079" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7b59-93de-55f315b870f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-77f1-bedf-8458da31b5f8" xlink:to="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7b59-93de-55f315b870f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019c9ac0-6c9f-75b8-be01-8a7544ddd41b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019c9ac0-6c9f-7f1c-a715-bdade9f41b41" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019c9ac0-6c9f-75b8-be01-8a7544ddd41b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-75b8-be01-8a7544ddd41b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019c9ac0-6c9f-75b8-be01-8a7544ddd41b" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-75b8-be01-8a7544ddd41b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-7a25-b6f5-03139dc69730" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019c9ac0-6c9f-75b8-be01-8a7544ddd41b" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-7a25-b6f5-03139dc69730" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0000To2000Member_019c9ac0-6c9f-71f2-bb7e-afcd55cb576d" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0000To2000Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-7a25-b6f5-03139dc69730" xlink:to="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0000To2000Member_019c9ac0-6c9f-71f2-bb7e-afcd55cb576d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0200To0400Member_019c9ac0-6c9f-7c71-906c-7b91d13071b4" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0200To0400Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-7a25-b6f5-03139dc69730" xlink:to="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0200To0400Member_019c9ac0-6c9f-7c71-906c-7b91d13071b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400To0600Member_019c9ac0-6c9f-784e-9fc6-878bb5e296bf" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400To0600Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-7a25-b6f5-03139dc69730" xlink:to="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400To0600Member_019c9ac0-6c9f-784e-9fc6-878bb5e296bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0600AndGreaterMember_019c9ac0-6c9f-72f5-bdb0-2fc5e0d73a8c" xlink:href="apo-20260331.xsd#apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0600AndGreaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019c9ac0-6c9f-7a25-b6f5-03139dc69730" xlink:to="loc_apo_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0600AndGreaterMember_019c9ac0-6c9f-72f5-bdb0-2fc5e0d73a8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating_019c9ac0-6c9f-752f-8938-88ac50d1aa90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-7949-a2a7-1911612b9732" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating_019c9ac0-6c9f-752f-8938-88ac50d1aa90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_019c9ac0-6c9f-710d-8f96-e695cb9dd3fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-7949-a2a7-1911612b9732" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_019c9ac0-6c9f-710d-8f96-e695cb9dd3fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019c9ac0-6c9f-71d2-82e5-0eb11fb38552" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019c9ac0-6c9f-7949-a2a7-1911612b9732" xlink:to="loc_us-gaap_PolicyholderFunds_019c9ac0-6c9f-71d2-82e5-0eb11fb38552" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofRollforwardbyProductWithinFuturePolicyBenefitsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofRollforwardbyProductWithinFuturePolicyBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofRollforwardbyProductWithinFuturePolicyBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7aa4-a5fb-cde68ccb5bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7400-8957-f143a2d96267" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7aa4-a5fb-cde68ccb5bdb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7400-8957-f143a2d96267" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-77b8-a411-5bb7a9acbc30" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7400-8957-f143a2d96267" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-77b8-a411-5bb7a9acbc30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-77b8-a411-5bb7a9acbc30_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-77b8-a411-5bb7a9acbc30" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-77b8-a411-5bb7a9acbc30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7aa4-b3f3-bf127985118e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-77b8-a411-5bb7a9acbc30" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7aa4-b3f3-bf127985118e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember_019c9ac0-6c9f-78d9-8d45-7c52d7af1e6f" xlink:href="apo-20260331.xsd#apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7aa4-b3f3-bf127985118e" xlink:to="loc_apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember_019c9ac0-6c9f-78d9-8d45-7c52d7af1e6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PayoutAnnuitiesWithLifeContingenciesMember_019c9ac0-6c9f-7ed8-8596-acef89f46dfd" xlink:href="apo-20260331.xsd#apo_PayoutAnnuitiesWithLifeContingenciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember_019c9ac0-6c9f-78d9-8d45-7c52d7af1e6f" xlink:to="loc_apo_PayoutAnnuitiesWithLifeContingenciesMember_019c9ac0-6c9f-7ed8-8596-acef89f46dfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WholeLifeInsuranceMember_019c9ac0-6c9f-7cbd-b8fc-7ae7f35564c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember_019c9ac0-6c9f-78d9-8d45-7c52d7af1e6f" xlink:to="loc_us-gaap_WholeLifeInsuranceMember_019c9ac0-6c9f-7cbd-b8fc-7ae7f35564c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7aa4-a5fb-cde68ccb5bdb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019c9ac0-6c9f-70ba-bd06-89a5dd6cc88e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019c9ac0-6c9f-70ba-bd06-89a5dd6cc88e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019c9ac0-6c9f-7489-966a-5b3e2846f48c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019c9ac0-6c9f-7489-966a-5b3e2846f48c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeDiscountRateAssumption_019c9ac0-6c9f-742e-bd4a-78003a760df8" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeDiscountRateAssumption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeDiscountRateAssumption_019c9ac0-6c9f-742e-bd4a-78003a760df8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019c9ac0-6c9f-727e-a270-5e9fb46f480a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019c9ac0-6c9f-727e-a270-5e9fb46f480a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019c9ac0-6c9f-7cb9-94f3-c3aa1aedca6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019c9ac0-6c9f-7cb9-94f3-c3aa1aedca6d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019c9ac0-6c9f-78b5-b104-1479d3c1b7de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019c9ac0-6c9f-78b5-b104-1479d3c1b7de" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIssuance_019c9ac0-6c9f-742c-ae1b-0a6a106e692e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIssuance_019c9ac0-6c9f-742c-ae1b-0a6a106e692e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019c9ac0-6c9f-751c-a10c-303dabb9b1c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019c9ac0-6c9f-751c-a10c-303dabb9b1c6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019c9ac0-6c9f-7f90-8390-e13acba62499" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019c9ac0-6c9f-7f90-8390-e13acba62499" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchange_019c9ac0-6c9f-7918-87ca-cb03eb28b9a3" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019c9ac0-6c9f-7154-b5fd-f5170cff3fe7" xlink:to="loc_apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchange_019c9ac0-6c9f-7918-87ca-cb03eb28b9a3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019c9ac0-6c9f-7bbb-8729-56f70365129d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019c9ac0-6c9f-76d1-95d9-219b987a7664" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeDiscountRateAssumption_019c9ac0-6c9f-7b31-a71a-4bde92cb0f11" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeDiscountRateAssumption"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019c9ac0-6c9f-7764-a0ee-31b4c9474cf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7aa4-a5fb-cde68ccb5bdb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019c9ac0-6c9f-7a65-a682-f6c99446ba0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019c9ac0-6c9f-7a65-a682-f6c99446ba0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019c9ac0-6c9f-79e7-a298-d09a5a328577" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019c9ac0-6c9f-79e7-a298-d09a5a328577" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeDiscountRateAssumption_019c9ac0-6c9f-780c-a9c8-5f634fd9d9b4" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeDiscountRateAssumption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeDiscountRateAssumption_019c9ac0-6c9f-780c-a9c8-5f634fd9d9b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019c9ac0-6c9f-7011-a607-62d5d71761bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019c9ac0-6c9f-7011-a607-62d5d71761bb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019c9ac0-6c9f-785a-811c-36e58020f36f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019c9ac0-6c9f-785a-811c-36e58020f36f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019c9ac0-6c9f-77da-a35f-af59d8c7127c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019c9ac0-6c9f-77da-a35f-af59d8c7127c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019c9ac0-6c9f-7465-a965-22df74ad1343" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019c9ac0-6c9f-7465-a965-22df74ad1343" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019c9ac0-6c9f-7803-a911-a69647b4dead" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019c9ac0-6c9f-7803-a911-a69647b4dead" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019c9ac0-6c9f-75e2-896f-3650f5fe6e59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019c9ac0-6c9f-75e2-896f-3650f5fe6e59" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019c9ac0-6c9f-7f34-9bb9-f598c1105262" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019c9ac0-6c9f-78a5-9f6c-81d197895375" xlink:to="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019c9ac0-6c9f-7f34-9bb9-f598c1105262" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019c9ac0-6c9f-7666-8af7-56a7cf2b68d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019c9ac0-6c9f-7389-875e-2a399059f0e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeDiscountRateAssumption_019c9ac0-6c9f-7ef8-b791-bd1815a5f7f1" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeDiscountRateAssumption"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019c9ac0-6c9f-785c-8851-6ebbfee92bb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019c9ac0-6c9f-7554-a057-a61f627ffde6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019c9ac0-6c9f-7293-b828-ffe069c030cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7aa4-a5fb-cde68ccb5bdb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019c9ac0-6c9f-7293-b828-ffe069c030cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7aa4-a5fb-cde68ccb5bdb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019c9ac0-6c9f-7738-a1bb-ae3b6db5a800" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019c9ac0-6c9f-7738-a1bb-ae3b6db5a800" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019c9ac0-6c9f-7912-a4dd-587905ce7bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019c9ac0-6c9f-7912-a4dd-587905ce7bbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019c9ac0-6c9f-76cc-9053-048fff2deeaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019c9ac0-6c9f-76cc-9053-048fff2deeaf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019c9ac0-6c9f-7774-8821-637ab8eade0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019c9ac0-6c9f-7774-8821-637ab8eade0f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019c9ac0-6c9f-7c26-b82a-3e9e79afbe7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019c9ac0-6c9f-7c26-b82a-3e9e79afbe7c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019c9ac0-6c9f-7acd-b3fd-6e78ccd0ab6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsuranceAbstract_019c9ac0-6c9f-71c8-bf9e-a0403d9345b0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019c9ac0-6c9f-7acd-b3fd-6e78ccd0ab6d" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofReconciliationofFuturePolicyBenefitandPremiumsandInterestExpenseDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofReconciliationofFuturePolicyBenefitandPremiumsandInterestExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofReconciliationofFuturePolicyBenefitandPremiumsandInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7838-8818-8a20997cc1ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7289-959e-cd0b2059cdc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7838-8818-8a20997cc1ea" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7289-959e-cd0b2059cdc8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7f90-a5cb-f014a37b7af0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7289-959e-cd0b2059cdc8" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7f90-a5cb-f014a37b7af0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7f90-a5cb-f014a37b7af0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7f90-a5cb-f014a37b7af0" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7f90-a5cb-f014a37b7af0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7b72-a743-2d611cb9b135" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7f90-a5cb-f014a37b7af0" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7b72-a743-2d611cb9b135" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PayoutAnnuitiesWithLifeContingenciesMember_019c9ac0-6c9f-7c48-b0a3-1cacc4ae566e" xlink:href="apo-20260331.xsd#apo_PayoutAnnuitiesWithLifeContingenciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7b72-a743-2d611cb9b135" xlink:to="loc_apo_PayoutAnnuitiesWithLifeContingenciesMember_019c9ac0-6c9f-7c48-b0a3-1cacc4ae566e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WholeLifeInsuranceMember_019c9ac0-6c9f-7a17-a0f1-576155d34716" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7b72-a743-2d611cb9b135" xlink:to="loc_us-gaap_WholeLifeInsuranceMember_019c9ac0-6c9f-7a17-a0f1-576155d34716" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ReconcilingItemsMember_019c9ac0-6c9f-7b01-a778-9c7d2e74d3cf" xlink:href="apo-20260331.xsd#apo_ReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7b72-a743-2d611cb9b135" xlink:to="loc_apo_ReconcilingItemsMember_019c9ac0-6c9f-7b01-a778-9c7d2e74d3cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019c9ac0-6c9f-746d-9c56-fb5b17c29850" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7838-8818-8a20997cc1ea" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019c9ac0-6c9f-746d-9c56-fb5b17c29850" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019c9ac0-6c9f-7bcb-a633-80868bb86caf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7838-8818-8a20997cc1ea" xlink:to="loc_us-gaap_PremiumsEarnedNet_019c9ac0-6c9f-7bcb-a633-80868bb86caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019c9ac0-6c9f-7118-919c-e7de1329b80f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-7838-8818-8a20997cc1ea" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019c9ac0-6c9f-7118-919c-e7de1329b80f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7487-ba31-25a608328515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7487-ba31-25a608328515" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7d17-ba95-532e806b98d4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019c9ac0-6c9f-7487-ba31-25a608328515" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7d17-ba95-532e806b98d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d17-ba95-532e806b98d4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7d17-ba95-532e806b98d4" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7d17-ba95-532e806b98d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-79ff-856d-8b9244793537" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7d17-ba95-532e806b98d4" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-79ff-856d-8b9244793537" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember_019c9ac0-6c9f-7636-9bbe-8fe6e37c721a" xlink:href="apo-20260331.xsd#apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-79ff-856d-8b9244793537" xlink:to="loc_apo_PayoutAnnuitiesWithLifeContingenciesAndWholeLifeInsuranceMember_019c9ac0-6c9f-7636-9bbe-8fe6e37c721a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitPeriodIncreaseDecrease_019c9ac0-6c9f-79cf-856f-6fe285df8f39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitPeriodIncreaseDecrease_019c9ac0-6c9f-79cf-856f-6fe285df8f39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019c9ac0-6c9f-7876-97b6-3b62d2de6a41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019c9ac0-6c9f-7876-97b6-3b62d2de6a41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyIncreaseDecreaseForDiscountRateAssumptions_019c9ac0-6c9f-757f-a179-8d316bac3161" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyIncreaseDecreaseForDiscountRateAssumptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyIncreaseDecreaseForDiscountRateAssumptions_019c9ac0-6c9f-757f-a179-8d316bac3161" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019c9ac0-6c9f-7909-a07f-37eaa1170670" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019c9ac0-6c9f-7909-a07f-37eaa1170670" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019c9ac0-6c9f-7247-b4a0-0852a15897dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019c9ac0-6c9f-7247-b4a0-0852a15897dd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019c9ac0-6c9f-791a-ac3b-3dbfc7d64a14" xlink:href="apo-20260331.xsd#apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_apo_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019c9ac0-6c9f-791a-ac3b-3dbfc7d64a14" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019c9ac0-6c9f-765b-9eb3-05bb29c30dd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019c9ac0-6c9f-765b-9eb3-05bb29c30dd9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFuturePolicyBenefitReserves_019c9ac0-6c9f-7738-9b02-61a759778ee9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInFuturePolicyBenefitReserves"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_IncreaseDecreaseInFuturePolicyBenefitReserves_019c9ac0-6c9f-7738-9b02-61a759778ee9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitPeriodIncreaseDecrease_019c9ac0-6c9f-7c43-81d5-948a545c8675" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_MarketRiskBenefitPeriodIncreaseDecrease_019c9ac0-6c9f-7c43-81d5-948a545c8675" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIssuance_019c9ac0-6c9f-7212-b5fb-bf8fd6812e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_MarketRiskBenefitIssuance_019c9ac0-6c9f-7212-b5fb-bf8fd6812e7c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019c9ac0-6c9f-7317-a381-7ad6a7b79c23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAttributedFeeCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019c9ac0-6c9f-7317-a381-7ad6a7b79c23" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitInterestExpense_019c9ac0-6c9f-7c0c-bc35-f454a0a038c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_MarketRiskBenefitInterestExpense_019c9ac0-6c9f-7c0c-bc35-f454a0a038c7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MarketRiskBenefitIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-7b40-bc1f-38c8b594608e" xlink:href="apo-20260331.xsd#apo_MarketRiskBenefitIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_apo_MarketRiskBenefitIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-7b40-bc1f-38c8b594608e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019c9ac0-6c9f-7997-a722-b4ecfdba3848" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019c9ac0-6c9f-7997-a722-b4ecfdba3848" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBenefitPayment_019c9ac0-6c9f-752e-af0e-13c746eaedb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_MarketRiskBenefitBenefitPayment_019c9ac0-6c9f-752e-af0e-13c746eaedb7" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019c9ac0-6c9f-7506-adda-f0b4256a5178" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019c9ac0-6c9f-780e-8efa-4a14e1408305" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019c9ac0-6c9f-7506-adda-f0b4256a5178" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofRollforwardofNetMarketRiskBenefitLiabilitiesbyProductDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofRollforwardofNetMarketRiskBenefitLiabilitiesbyProductDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofRollforwardofNetMarketRiskBenefitLiabilitiesbyProductDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-74f1-b3d0-7f3a07104ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-78ed-953f-8e0e035a966f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-74f1-b3d0-7f3a07104ff8" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-78ed-953f-8e0e035a966f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7093-b722-1dece8769c6f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-78ed-953f-8e0e035a966f" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7093-b722-1dece8769c6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7093-b722-1dece8769c6f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7093-b722-1dece8769c6f" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7093-b722-1dece8769c6f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-79bc-a632-0e96db35c715" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7093-b722-1dece8769c6f" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-79bc-a632-0e96db35c715" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-701b-837a-d8430d399bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-79bc-a632-0e96db35c715" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-701b-837a-d8430d399bfc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7478-b6f9-51ec305531a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-79bc-a632-0e96db35c715" xlink:to="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7478-b6f9-51ec305531a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-74f1-b3d0-7f3a07104ff8" xlink:to="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-7668-9379-a002ef82678e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-7668-9379-a002ef82678e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_019c9ac0-6c9f-7a0d-89d2-f12d4f9aa815" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_019c9ac0-6c9f-7a0d-89d2-f12d4f9aa815" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019c9ac0-6c9f-71dc-94d2-2665233f6ae9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019c9ac0-6c9f-71dc-94d2-2665233f6ae9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIssuance_019c9ac0-6c9f-7aad-81ae-d50dd7618d4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitIssuance_019c9ac0-6c9f-7aad-81ae-d50dd7618d4e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitInterestExpense_019c9ac0-6c9f-7824-be34-5ca16d235b36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitInterestExpense_019c9ac0-6c9f-7824-be34-5ca16d235b36" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019c9ac0-6c9f-7093-93c6-4457ed7cb7a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAttributedFeeCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019c9ac0-6c9f-7093-93c6-4457ed7cb7a9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBenefitPayment_019c9ac0-6c9f-7431-a981-7e9861d2fda2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitBenefitPayment_019c9ac0-6c9f-7431-a981-7e9861d2fda2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019c9ac0-6c9f-7615-8be0-419ea826e3ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019c9ac0-6c9f-7615-8be0-419ea826e3ca" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019c9ac0-6c9f-711c-bd12-e46ce53fb452" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019c9ac0-6c9f-711c-bd12-e46ce53fb452" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromFutureExpectedPolicyholderBehaviorAssumption_019c9ac0-6c9f-7aae-ad92-f25e750e4efd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromFutureExpectedPolicyholderBehaviorAssumption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromFutureExpectedPolicyholderBehaviorAssumption_019c9ac0-6c9f-7aae-ad92-f25e750e4efd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019c9ac0-6c9f-7432-baae-bf8fb6bb77cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_019c9ac0-6c9f-73ad-b86e-be9e00ddde20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-7b9a-b89d-a0cac66b5384" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_019c9ac0-6c9f-7d9f-af83-833b928823e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_019c9ac0-6c9f-7d9f-af83-833b928823e4" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019c9ac0-6c9f-77d5-8f6c-9430c76ca10f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019c9ac0-6c9f-7b94-8e63-db66e28512ac" xlink:to="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019c9ac0-6c9f-77d5-8f6c-9430c76ca10f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRiskAbstract_019c9ac0-6c9f-795c-ac20-4162af3e56ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRiskAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-74f1-b3d0-7f3a07104ff8" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRiskAbstract_019c9ac0-6c9f-795c-ac20-4162af3e56ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019c9ac0-6c9f-7585-a023-90092a5197d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRiskAbstract_019c9ac0-6c9f-795c-ac20-4162af3e56ff" xlink:to="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019c9ac0-6c9f-7585-a023-90092a5197d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAge1_019c9ac0-6c9f-76a7-b805-8bea64ef4639" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRiskAbstract_019c9ac0-6c9f-795c-ac20-4162af3e56ff" xlink:to="loc_us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAge1_019c9ac0-6c9f-76a7-b805-8bea64ef4639" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofReconciliationofMarketRiskBenefitsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofReconciliationofMarketRiskBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofReconciliationofMarketRiskBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7799-91de-380d33b0df00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-7aae-9760-d28bb1eac140" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7799-91de-380d33b0df00" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-7aae-9760-d28bb1eac140" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7227-b152-4a40f92ef525" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-7aae-9760-d28bb1eac140" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7227-b152-4a40f92ef525" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7227-b152-4a40f92ef525_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7227-b152-4a40f92ef525" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7227-b152-4a40f92ef525_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e4e-813a-cb266ba8928f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6c9f-7227-b152-4a40f92ef525" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e4e-813a-cb266ba8928f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-70d2-bfc0-18a69c897063" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e4e-813a-cb266ba8928f" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019c9ac0-6c9f-70d2-bfc0-18a69c897063" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7531-86e7-dc05c2ab1962" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6c9f-7e4e-813a-cb266ba8928f" xlink:to="loc_us-gaap_IndexedAnnuityMember_019c9ac0-6c9f-7531-86e7-dc05c2ab1962" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_019c9ac0-6c9f-76aa-b08e-8284119a688c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7799-91de-380d33b0df00" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_019c9ac0-6c9f-76aa-b08e-8284119a688c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019c9ac0-6c9f-7b3c-a2c7-bb783f8f68c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7799-91de-380d33b0df00" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019c9ac0-6c9f-7b3c-a2c7-bb783f8f68c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-78fd-bde2-2ed91aeb9059" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7799-91de-380d33b0df00" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-78fd-bde2-2ed91aeb9059" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/LongdurationContractsScheduleofUnobservableInputsforMarketRiskBenefitsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#LongdurationContractsScheduleofUnobservableInputsforMarketRiskBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/LongdurationContractsScheduleofUnobservableInputsforMarketRiskBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7ecb-93cc-18cbee5c6b2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-79ff-9080-f249b17c4c6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7ecb-93cc-18cbee5c6b2f" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-79ff-9080-f249b17c4c6b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c9ac0-6c9f-733f-ab65-5b26447f444b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-79ff-9080-f249b17c4c6b" xlink:to="loc_srt_RangeAxis_019c9ac0-6c9f-733f-ab65-5b26447f444b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6c9f-733f-ab65-5b26447f444b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c9ac0-6c9f-733f-ab65-5b26447f444b" xlink:to="loc_srt_RangeMember_019c9ac0-6c9f-733f-ab65-5b26447f444b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6c9f-782b-9f83-50dcb27d3f6f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c9ac0-6c9f-733f-ab65-5b26447f444b" xlink:to="loc_srt_RangeMember_019c9ac0-6c9f-782b-9f83-50dcb27d3f6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c9ac0-6c9f-73eb-a6e0-14763235f94e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6c9f-782b-9f83-50dcb27d3f6f" xlink:to="loc_srt_MinimumMember_019c9ac0-6c9f-73eb-a6e0-14763235f94e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c9ac0-6c9f-7fc0-980b-f7ab0fffeb42" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6c9f-782b-9f83-50dcb27d3f6f" xlink:to="loc_srt_MaximumMember_019c9ac0-6c9f-7fc0-980b-f7ab0fffeb42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019c9ac0-6c9f-77c5-9b68-558ed6a14511" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6c9f-782b-9f83-50dcb27d3f6f" xlink:to="loc_srt_WeightedAverageMember_019c9ac0-6c9f-77c5-9b68-558ed6a14511" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6c9f-78ee-ba18-cbe31ffa3683" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-79ff-9080-f249b17c4c6b" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6c9f-78ee-ba18-cbe31ffa3683" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-78ee-ba18-cbe31ffa3683_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6c9f-78ee-ba18-cbe31ffa3683" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-78ee-ba18-cbe31ffa3683_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-760a-b21d-29c580650459" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019c9ac0-6c9f-78ee-ba18-cbe31ffa3683" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-760a-b21d-29c580650459" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputNonperformanceRiskMember_019c9ac0-6c9f-7d8d-97bb-ab17b7507d81" xlink:href="apo-20260331.xsd#apo_MeasurementInputNonperformanceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-760a-b21d-29c580650459" xlink:to="loc_apo_MeasurementInputNonperformanceRiskMember_019c9ac0-6c9f-7d8d-97bb-ab17b7507d81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputOptionBudgetMember_019c9ac0-6c9f-7383-a2fb-8abd129f2e5d" xlink:href="apo-20260331.xsd#apo_MeasurementInputOptionBudgetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-760a-b21d-29c580650459" xlink:to="loc_apo_MeasurementInputOptionBudgetMember_019c9ac0-6c9f-7383-a2fb-8abd129f2e5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MeasurementInputSurrenderRateMember_019c9ac0-6c9f-7662-9be4-46043f3af76f" xlink:href="apo-20260331.xsd#apo_MeasurementInputSurrenderRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-760a-b21d-29c580650459" xlink:to="loc_apo_MeasurementInputSurrenderRateMember_019c9ac0-6c9f-7662-9be4-46043f3af76f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputUtilizationRateMember_019c9ac0-6c9f-736a-b82f-b2c6bc592edd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputUtilizationRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019c9ac0-6c9f-760a-b21d-29c580650459" xlink:to="loc_us-gaap_MeasurementInputUtilizationRateMember_019c9ac0-6c9f-736a-b82f-b2c6bc592edd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6c9f-70e2-aeb9-5eacd0f8b3fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019c9ac0-6c9f-79ff-9080-f249b17c4c6b" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6c9f-70e2-aeb9-5eacd0f8b3fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6c9f-70e2-aeb9-5eacd0f8b3fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6c9f-70e2-aeb9-5eacd0f8b3fd" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6c9f-70e2-aeb9-5eacd0f8b3fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6c9f-789e-a6b0-12bef444051e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019c9ac0-6c9f-70e2-aeb9-5eacd0f8b3fd" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6c9f-789e-a6b0-12bef444051e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019c9ac0-6c9f-7b75-9947-feab9a6c9a08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019c9ac0-6c9f-789e-a6b0-12bef444051e" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019c9ac0-6c9f-7b75-9947-feab9a6c9a08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-7cf2-b30a-98306e2f5cb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7ecb-93cc-18cbee5c6b2f" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019c9ac0-6c9f-7cf2-b30a-98306e2f5cb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitMeasurementInput_019c9ac0-6c9f-77d9-99a9-50b84969ea5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019c9ac0-6c9f-7ecb-93cc-18cbee5c6b2f" xlink:to="loc_us-gaap_MarketRiskBenefitMeasurementInput_019c9ac0-6c9f-77d9-99a9-50b84969ea5f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DebtScheduleofDebtDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DebtScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-717f-833a-1c018ec62d32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-78cc-bf41-d4bdda4e4bc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-717f-833a-1c018ec62d32" xlink:to="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-78cc-bf41-d4bdda4e4bc4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b35-8a62-3ec53311dd8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-78cc-bf41-d4bdda4e4bc4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b35-8a62-3ec53311dd8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b35-8a62-3ec53311dd8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b35-8a62-3ec53311dd8d" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b35-8a62-3ec53311dd8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b53-9b13-ee262aa8bb6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b35-8a62-3ec53311dd8d" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b53-9b13-ee262aa8bb6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-7c4e-9b3b-3339cc946331" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b53-9b13-ee262aa8bb6b" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-7c4e-9b3b-3339cc946331" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-73e1-8e65-9c432af70f03" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b53-9b13-ee262aa8bb6b" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-73e1-8e65-9c432af70f03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-72ed-b8c0-813b52eb0c68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-78cc-bf41-d4bdda4e4bc4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-72ed-b8c0-813b52eb0c68" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-72ed-b8c0-813b52eb0c68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-72ed-b8c0-813b52eb0c68" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-72ed-b8c0-813b52eb0c68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7ca4-9f30-014de66bb763" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-72ed-b8c0-813b52eb0c68" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7ca4-9f30-014de66bb763" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019c9ac0-6c9f-7759-abcf-48518b2e5bdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7ca4-9f30-014de66bb763" xlink:to="loc_us-gaap_SeniorNotesMember_019c9ac0-6c9f-7759-abcf-48518b2e5bdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_019c9ac0-6c9f-722d-bf91-d47a8b13a7f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7ca4-9f30-014de66bb763" xlink:to="loc_us-gaap_SubordinatedDebtMember_019c9ac0-6c9f-722d-bf91-d47a8b13a7f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-7627-a782-2818de6a9448" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-78cc-bf41-d4bdda4e4bc4" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-7627-a782-2818de6a9448" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7627-a782-2818de6a9448_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-7627-a782-2818de6a9448" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7627-a782-2818de6a9448_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-7627-a782-2818de6a9448" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandTwentySixSeniorNotesMember_019c9ac0-6c9f-745b-879f-32a1d07ceeee" xlink:href="apo-20260331.xsd#apo_TwoThousandTwentySixSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandTwentySixSeniorNotesMember_019c9ac0-6c9f-745b-879f-32a1d07ceeee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandTwentyNineSeniorNotesMember_019c9ac0-6c9f-7a0d-bb06-0067460590e9" xlink:href="apo-20260331.xsd#apo_TwoThousandTwentyNineSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandTwentyNineSeniorNotesMember_019c9ac0-6c9f-7a0d-bb06-0067460590e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_A265TwoThousandThirtySeniorNotesMember_019c9ac0-6c9f-77d5-861c-3ec2362bd95f" xlink:href="apo-20260331.xsd#apo_A265TwoThousandThirtySeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_A265TwoThousandThirtySeniorNotesMember_019c9ac0-6c9f-77d5-861c-3ec2362bd95f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_A4.60TwoThousandThirtyOneSeniorNotesMember_019c9ac0-6c9f-70dd-b5da-fe0b573644f1" xlink:href="apo-20260331.xsd#apo_A4.60TwoThousandThirtyOneSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_A4.60TwoThousandThirtyOneSeniorNotesMember_019c9ac0-6c9f-70dd-b5da-fe0b573644f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandThirtyThreeNotesMember_019c9ac0-6c9f-7366-beb6-78dc31c3eaeb" xlink:href="apo-20260331.xsd#apo_TwoThousandThirtyThreeNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandThirtyThreeNotesMember_019c9ac0-6c9f-7366-beb6-78dc31c3eaeb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandThirtyFiveSeniorNotesMember_019c9ac0-6c9f-7cca-94af-dcad383321f6" xlink:href="apo-20260331.xsd#apo_TwoThousandThirtyFiveSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandThirtyFiveSeniorNotesMember_019c9ac0-6c9f-7cca-94af-dcad383321f6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandThirtySixSeniorNotesMember_019d4c20-304f-7795-9ecf-2d242403ecc1" xlink:href="apo-20260331.xsd#apo_TwoThousandThirtySixSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandThirtySixSeniorNotesMember_019d4c20-304f-7795-9ecf-2d242403ecc1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFortyEightSeniorNotesMember_019c9ac0-6c9f-7051-82b2-90995754d94b" xlink:href="apo-20260331.xsd#apo_TwoThousandFortyEightSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFortyEightSeniorNotesMember_019c9ac0-6c9f-7051-82b2-90995754d94b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyFourSeniorNotesMember_019c9ac0-6c9f-760f-b69c-dcd3472b8cec" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyFourSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFiftyFourSeniorNotesMember_019c9ac0-6c9f-760f-b69c-dcd3472b8cec" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyThreeSubordinatedNotesMember_019c9ac0-6c9f-7666-afa6-bc3b186025da" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyThreeSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFiftyThreeSubordinatedNotesMember_019c9ac0-6c9f-7666-afa6-bc3b186025da" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyFourSubordinatedNotesMember_019c9ac0-6c9f-72d6-ab36-0d28f6f4f1d3" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyFourSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFiftyFourSubordinatedNotesMember_019c9ac0-6c9f-72d6-ab36-0d28f6f4f1d3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandTwentySevenSubordinatedNotesMember_019d9ef7-8790-780b-be0a-8778081c64f7" xlink:href="apo-20260331.xsd#apo_TwoThousandTwentySevenSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandTwentySevenSubordinatedNotesMember_019d9ef7-8790-780b-be0a-8778081c64f7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandTwentyEightSeniorNotesMember_019c9ac0-6c9f-7150-933e-f5ddfad1ddc1" xlink:href="apo-20260331.xsd#apo_TwoThousandTwentyEightSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandTwentyEightSeniorNotesMember_019c9ac0-6c9f-7150-933e-f5ddfad1ddc1" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_A615DueTwoThousandThirtySeniorNotesMember_019c9ac0-6c9f-7a59-913d-3769929e1c2e" xlink:href="apo-20260331.xsd#apo_A615DueTwoThousandThirtySeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_A615DueTwoThousandThirtySeniorNotesMember_019c9ac0-6c9f-7a59-913d-3769929e1c2e" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandThirtyOneSeniorNotesMember_019c9ac0-6c9f-765b-807c-e6b284e0c019" xlink:href="apo-20260331.xsd#apo_TwoThousandThirtyOneSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandThirtyOneSeniorNotesMember_019c9ac0-6c9f-765b-807c-e6b284e0c019" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandThirtyThreeSeniorNotesMember_019c9ac0-6c9f-7f76-a65e-7aff461b5a38" xlink:href="apo-20260331.xsd#apo_TwoThousandThirtyThreeSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandThirtyThreeSeniorNotesMember_019c9ac0-6c9f-7f76-a65e-7aff461b5a38" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandThirtyFourSeniorNotesMember_019c9ac0-6c9f-742c-9b62-d51768b71f89" xlink:href="apo-20260331.xsd#apo_TwoThousandThirtyFourSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandThirtyFourSeniorNotesMember_019c9ac0-6c9f-742c-9b62-d51768b71f89" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyOneSeniorNotesMember_019c9ac0-6c9f-7064-bb60-b8a981a59ec5" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyOneSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFiftyOneSeniorNotesMember_019c9ac0-6c9f-7064-bb60-b8a981a59ec5" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyTwoSeniorNotesMember_019c9ac0-6c9f-7298-9e81-3accf3fb7a38" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyTwoSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFiftyTwoSeniorNotesMember_019c9ac0-6c9f-7298-9e81-3accf3fb7a38" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyFourSeniorNotesMember_019c9ac0-6c9f-749f-8536-93d0481d62e2" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyFourSeniorNotesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyFiveSeniorNotesMember_019c9ac0-6c9f-7d28-b717-87cf540d0e69" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyFiveSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFiftyFiveSeniorNotesMember_019c9ac0-6c9f-7d28-b717-87cf540d0e69" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyFourSubordinatedNotesMember_019c9ac0-6c9f-7e5d-8817-77ad682ae9c5" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyFourSubordinatedNotesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandFiftyFiveSubordinatedNotesMember_019c9ac0-6c9f-7069-9e54-a418badeb804" xlink:href="apo-20260331.xsd#apo_TwoThousandFiftyFiveSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandFiftyFiveSubordinatedNotesMember_019c9ac0-6c9f-7069-9e54-a418badeb804" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandSixtyFourSubordinatedNotesMember_019c9ac0-6c9f-750e-be1e-012934c36041" xlink:href="apo-20260331.xsd#apo_TwoThousandSixtyFourSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7ce9-8f21-c832fc05ecc4" xlink:to="loc_apo_TwoThousandSixtyFourSubordinatedNotesMember_019c9ac0-6c9f-750e-be1e-012934c36041" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecourseStatusAxis_019d9efc-dd08-7ae0-bccc-d0dd60bf1901" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecourseStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-78cc-bf41-d4bdda4e4bc4" xlink:to="loc_us-gaap_RecourseStatusAxis_019d9efc-dd08-7ae0-bccc-d0dd60bf1901" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecourseStatusDomain_019d9efc-dd08-7ae0-bccc-d0dd60bf1901_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecourseStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RecourseStatusAxis_019d9efc-dd08-7ae0-bccc-d0dd60bf1901" xlink:to="loc_us-gaap_RecourseStatusDomain_019d9efc-dd08-7ae0-bccc-d0dd60bf1901_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecourseStatusDomain_019d9efc-dd08-7cf3-b9e5-e790f5082306" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecourseStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RecourseStatusAxis_019d9efc-dd08-7ae0-bccc-d0dd60bf1901" xlink:to="loc_us-gaap_RecourseStatusDomain_019d9efc-dd08-7cf3-b9e5-e790f5082306" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecourseMember_019d9efd-0bda-716e-9149-bfc6afc8f887" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecourseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RecourseStatusDomain_019d9efc-dd08-7cf3-b9e5-e790f5082306" xlink:to="loc_us-gaap_RecourseMember_019d9efd-0bda-716e-9149-bfc6afc8f887" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrecourseMember_019d9efd-7ea2-7af4-b812-27752100839b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrecourseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RecourseStatusDomain_019d9efc-dd08-7cf3-b9e5-e790f5082306" xlink:to="loc_us-gaap_NonrecourseMember_019d9efd-7ea2-7af4-b812-27752100839b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019c9ac0-6c9f-750b-89dc-6fc0ecb500d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-717f-833a-1c018ec62d32" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019c9ac0-6c9f-750b-89dc-6fc0ecb500d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c9ac0-6c9f-7195-baee-c1e067d63f8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-717f-833a-1c018ec62d32" xlink:to="loc_us-gaap_LongTermDebt_019c9ac0-6c9f-7195-baee-c1e067d63f8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019c9ac0-6c9f-78bd-af3b-3bf67741ddbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-717f-833a-1c018ec62d32" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019c9ac0-6c9f-78bd-af3b-3bf67741ddbe" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7519-b76c-04504528d683" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7519-b76c-04504528d683" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-77a8-8a04-d0d059465216" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7519-b76c-04504528d683" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-77a8-8a04-d0d059465216" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-77a8-8a04-d0d059465216_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-77a8-8a04-d0d059465216" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-77a8-8a04-d0d059465216_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-77a8-8a04-d0d059465216" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandThirtySixSeniorNotesMember_019d4c24-3a0b-7673-a277-28381b08af05" xlink:href="apo-20260331.xsd#apo_TwoThousandThirtySixSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:to="loc_apo_TwoThousandThirtySixSeniorNotesMember_019d4c24-3a0b-7673-a277-28381b08af05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TwoThousandSixtyFourSubordinatedNotesMember_019c9ac0-6c9f-77da-a22a-92942bc8bb14" xlink:href="apo-20260331.xsd#apo_TwoThousandSixtyFourSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:to="loc_apo_TwoThousandSixtyFourSubordinatedNotesMember_019c9ac0-6c9f-77da-a22a-92942bc8bb14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AGMCreditFacilityMember_019c9ac0-6c9f-7560-b8a1-48e64a43e142" xlink:href="apo-20260331.xsd#apo_AGMCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:to="loc_apo_AGMCreditFacilityMember_019c9ac0-6c9f-7560-b8a1-48e64a43e142" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AMHCreditFacilityMember_019c9ac0-6c9f-7779-b2d3-b9255218e503" xlink:href="apo-20260331.xsd#apo_AMHCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:to="loc_apo_AMHCreditFacilityMember_019c9ac0-6c9f-7779-b2d3-b9255218e503" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AHLCreditFacilityMember_019c9ac0-6c9f-74ad-aab7-52dbac91edaf" xlink:href="apo-20260331.xsd#apo_AHLCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:to="loc_apo_AHLCreditFacilityMember_019c9ac0-6c9f-74ad-aab7-52dbac91edaf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AHLLiquidityFacilityMember_019c9ac0-6c9f-7cf6-8e71-4273aaaac6f4" xlink:href="apo-20260331.xsd#apo_AHLLiquidityFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7c6a-bade-6752ebf83609" xlink:to="loc_apo_AHLLiquidityFacilityMember_019c9ac0-6c9f-7cf6-8e71-4273aaaac6f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-7eb3-a91e-f72be63119ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7519-b76c-04504528d683" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-7eb3-a91e-f72be63119ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7eb3-a91e-f72be63119ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-7eb3-a91e-f72be63119ce" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7eb3-a91e-f72be63119ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7f88-a7f5-06fd016b66be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-7eb3-a91e-f72be63119ce" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7f88-a7f5-06fd016b66be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019c9ac0-6c9f-7cfd-b401-7aa19a0cb4da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7f88-a7f5-06fd016b66be" xlink:to="loc_us-gaap_SeniorNotesMember_019c9ac0-6c9f-7cfd-b401-7aa19a0cb4da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_019c9ac0-6c9f-76ba-8e8f-a8c17fb6efdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7f88-a7f5-06fd016b66be" xlink:to="loc_us-gaap_SubordinatedDebtMember_019c9ac0-6c9f-76ba-8e8f-a8c17fb6efdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019c9ac0-6c9f-7196-afa3-789d44a4160a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7f88-a7f5-06fd016b66be" xlink:to="loc_us-gaap_LineOfCreditMember_019c9ac0-6c9f-7196-afa3-789d44a4160a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7f92-92f5-10c480dccb07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7519-b76c-04504528d683" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7f92-92f5-10c480dccb07" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7f92-92f5-10c480dccb07_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7f92-92f5-10c480dccb07" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7f92-92f5-10c480dccb07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7102-99f8-54b546f1312a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7f92-92f5-10c480dccb07" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7102-99f8-54b546f1312a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-7504-bb50-e13f1cc4351d" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7102-99f8-54b546f1312a" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-7504-bb50-e13f1cc4351d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-7ba2-a4d0-19324f8e5228" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7102-99f8-54b546f1312a" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-7ba2-a4d0-19324f8e5228" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-7e58-811e-1f9fc1963408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7519-b76c-04504528d683" xlink:to="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-7e58-811e-1f9fc1963408" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-7e58-811e-1f9fc1963408_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-7e58-811e-1f9fc1963408" xlink:to="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-7e58-811e-1f9fc1963408_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-78d6-90a6-1cbe3d4dba27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-7e58-811e-1f9fc1963408" xlink:to="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-78d6-90a6-1cbe3d4dba27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c9ac0-6c9f-7644-9339-814cabd98034" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-78d6-90a6-1cbe3d4dba27" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c9ac0-6c9f-7644-9339-814cabd98034" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019c9ac0-6c9f-701c-ad40-cad01c8b9e89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019c9ac0-6c9f-701c-ad40-cad01c8b9e89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019c9ac0-6c9f-7fb6-af80-da7aa48fbef0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019c9ac0-6c9f-7fb6-af80-da7aa48fbef0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019c9ac0-6c9f-771a-ba0c-d871534935f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019c9ac0-6c9f-771a-ba0c-d871534935f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DebtInstrumentDeferredInterestPaymentPeriod_019c9ac0-6c9f-7d05-b7ab-5c565021c523" xlink:href="apo-20260331.xsd#apo_DebtInstrumentDeferredInterestPaymentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_DebtInstrumentDeferredInterestPaymentPeriod_019c9ac0-6c9f-7d05-b7ab-5c565021c523" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c9ac0-6c9f-78a0-af1a-7eef0d0c0c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c9ac0-6c9f-78a0-af1a-7eef0d0c0c4e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityAccordionFeature_019c9ac0-6c9f-76c1-b7d5-772398a37230" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityAccordionFeature"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_LineOfCreditFacilityAccordionFeature_019c9ac0-6c9f-76c1-b7d5-772398a37230" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityCovenantTermsNetLeverageRatioMaximum_019c9ac0-6c9f-7210-b2fa-14a640339b2f" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityCovenantTermsNetLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_LineOfCreditFacilityCovenantTermsNetLeverageRatioMaximum_019c9ac0-6c9f-7210-b2fa-14a640339b2f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019c9ac0-6c9f-7181-a231-7acba528bcea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_us-gaap_LineOfCredit_019c9ac0-6c9f-7181-a231-7acba528bcea" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019c9ac0-6c9f-707e-9a9a-b6bf331fb4f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_us-gaap_DebtInstrumentTerm_019c9ac0-6c9f-707e-9a9a-b6bf331fb4f3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DebtInstrumentNumberOfExtensions_019c9ac0-6c9f-73ca-be88-d25cf95912dd" xlink:href="apo-20260331.xsd#apo_DebtInstrumentNumberOfExtensions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_DebtInstrumentNumberOfExtensions_019c9ac0-6c9f-73ca-be88-d25cf95912dd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityRenewalTerm_019c9ac0-6c9f-7285-8c89-88e5b4895aca" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_LineOfCreditFacilityRenewalTerm_019c9ac0-6c9f-7285-8c89-88e5b4895aca" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019c9ac0-6c9f-73c7-bb63-5ad3263eb7bf" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019c9ac0-6c9f-73c7-bb63-5ad3263eb7bf" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityCovenantTermsMaximumConsolidatedDebtToCapitalizationRatio_019c9ac0-6c9f-766a-8325-8ea4d96e7e1d" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityCovenantTermsMaximumConsolidatedDebtToCapitalizationRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_LineOfCreditFacilityCovenantTermsMaximumConsolidatedDebtToCapitalizationRatio_019c9ac0-6c9f-766a-8325-8ea4d96e7e1d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityCovenantTermsConsolidatedNetWorthRequirementAmount_019c9ac0-6c9f-70f4-9732-cc64e2cdbb21" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityCovenantTermsConsolidatedNetWorthRequirementAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_LineOfCreditFacilityCovenantTermsConsolidatedNetWorthRequirementAmount_019c9ac0-6c9f-70f4-9732-cc64e2cdbb21" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityConversionTerm_019c9ac0-6c9f-798d-bee6-b4fa02e60810" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityConversionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-770e-8ece-134fbfb1089d" xlink:to="loc_apo_LineOfCreditFacilityConversionTerm_019c9ac0-6c9f-798d-bee6-b4fa02e60810" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DebtScheduleofCreditandLiquidityFacilitiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DebtScheduleofCreditandLiquidityFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DebtScheduleofCreditandLiquidityFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-72e4-aad9-d3a7ad2d339e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7ff7-b1b0-dca417946be2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-72e4-aad9-d3a7ad2d339e" xlink:to="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7ff7-b1b0-dca417946be2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-745f-9a4a-350d58c20c99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7ff7-b1b0-dca417946be2" xlink:to="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-745f-9a4a-350d58c20c99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-745f-9a4a-350d58c20c99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-745f-9a4a-350d58c20c99" xlink:to="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-745f-9a4a-350d58c20c99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-716e-a661-85b8fc003e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c9ac0-6c9f-745f-9a4a-350d58c20c99" xlink:to="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-716e-a661-85b8fc003e0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c9ac0-6c9f-794e-b60c-4da5e5ed63b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c9ac0-6c9f-716e-a661-85b8fc003e0e" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c9ac0-6c9f-794e-b60c-4da5e5ed63b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-71bd-8578-2a92c6df6cc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7ff7-b1b0-dca417946be2" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-71bd-8578-2a92c6df6cc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-71bd-8578-2a92c6df6cc4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-71bd-8578-2a92c6df6cc4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-71bd-8578-2a92c6df6cc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7a5f-9ad1-c7625644b522" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c9ac0-6c9f-71bd-8578-2a92c6df6cc4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7a5f-9ad1-c7625644b522" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AGMCreditFacilityMember_019c9ac0-6c9f-7ab1-89e7-b6f42bb03269" xlink:href="apo-20260331.xsd#apo_AGMCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7a5f-9ad1-c7625644b522" xlink:to="loc_apo_AGMCreditFacilityMember_019c9ac0-6c9f-7ab1-89e7-b6f42bb03269" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AHLCreditFacilityMember_019c9ac0-6c9f-75dc-b031-8f0931ddf3be" xlink:href="apo-20260331.xsd#apo_AHLCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7a5f-9ad1-c7625644b522" xlink:to="loc_apo_AHLCreditFacilityMember_019c9ac0-6c9f-75dc-b031-8f0931ddf3be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AHLLiquidityFacilityMember_019c9ac0-6c9f-728a-8b11-c4aaed1ad72e" xlink:href="apo-20260331.xsd#apo_AHLLiquidityFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c9ac0-6c9f-7a5f-9ad1-c7625644b522" xlink:to="loc_apo_AHLLiquidityFacilityMember_019c9ac0-6c9f-728a-8b11-c4aaed1ad72e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-721e-834f-adf35869fe63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7ff7-b1b0-dca417946be2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-721e-834f-adf35869fe63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-721e-834f-adf35869fe63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-721e-834f-adf35869fe63" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-721e-834f-adf35869fe63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7492-a788-655d4044950f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6c9f-721e-834f-adf35869fe63" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7492-a788-655d4044950f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019c9ac0-6c9f-7126-bc90-8a862ed4c4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6c9f-7492-a788-655d4044950f" xlink:to="loc_us-gaap_LineOfCreditMember_019c9ac0-6c9f-7126-bc90-8a862ed4c4b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b34-8726-86f1ba987843" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7ff7-b1b0-dca417946be2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b34-8726-86f1ba987843" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b34-8726-86f1ba987843_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b34-8726-86f1ba987843" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7b34-8726-86f1ba987843_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7589-be1b-d1838c863df9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-7b34-8726-86f1ba987843" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7589-be1b-d1838c863df9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-7d71-be2d-68938a1c5ff5" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7589-be1b-d1838c863df9" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-7d71-be2d-68938a1c5ff5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-7094-ae80-7e73ac6a2740" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-7589-be1b-d1838c863df9" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-7094-ae80-7e73ac6a2740" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c9ac0-6c9f-79c0-8a29-fb0e8b4899a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-72e4-aad9-d3a7ad2d339e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c9ac0-6c9f-79c0-8a29-fb0e8b4899a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019c9ac0-6c9f-7925-96f5-fad3dc47c2a1" xlink:href="apo-20260331.xsd#apo_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-72e4-aad9-d3a7ad2d339e" xlink:to="loc_apo_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeature_019c9ac0-6c9f-7925-96f5-fad3dc47c2a1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/DebtScheduleofInterestExpenseDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#DebtScheduleofInterestExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/DebtScheduleofInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-76f0-89f7-b9a1c033e023" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7097-b22d-c151d1d124af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-76f0-89f7-b9a1c033e023" xlink:to="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7097-b22d-c151d1d124af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-714f-b55b-cf19e25f6fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c9ac0-6c9f-7097-b22d-c151d1d124af" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-714f-b55b-cf19e25f6fa4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-714f-b55b-cf19e25f6fa4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-714f-b55b-cf19e25f6fa4" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-714f-b55b-cf19e25f6fa4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-75d9-b8a8-e234c34cf781" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6c9f-714f-b55b-cf19e25f6fa4" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-75d9-b8a8-e234c34cf781" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-705b-a944-9a8570125448" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-75d9-b8a8-e234c34cf781" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6c9f-705b-a944-9a8570125448" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-790a-ad25-ab352b0a26ae" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6c9f-75d9-b8a8-e234c34cf781" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6c9f-790a-ad25-ab352b0a26ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019c9ac0-6c9f-7d4f-8d66-c06f28802c96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c9ac0-6c9f-76f0-89f7-b9a1c033e023" xlink:to="loc_us-gaap_InterestExpenseDebt_019c9ac0-6c9f-7d4f-8d66-c06f28802c96" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/EquityBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#EquityBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/EquityBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6c9f-7486-bca2-9fbf22d1c0a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6c9f-7486-bca2-9fbf22d1c0a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c9ac0-6c9f-7239-b61d-1746f2605ebf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6c9f-7486-bca2-9fbf22d1c0a0" xlink:to="loc_srt_RangeAxis_019c9ac0-6c9f-7239-b61d-1746f2605ebf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6c9f-7239-b61d-1746f2605ebf_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c9ac0-6c9f-7239-b61d-1746f2605ebf" xlink:to="loc_srt_RangeMember_019c9ac0-6c9f-7239-b61d-1746f2605ebf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6c9f-75b2-9518-e2fa12fa1712" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c9ac0-6c9f-7239-b61d-1746f2605ebf" xlink:to="loc_srt_RangeMember_019c9ac0-6c9f-75b2-9518-e2fa12fa1712" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c9ac0-6c9f-7d20-bce4-b6afe4591297" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6c9f-75b2-9518-e2fa12fa1712" xlink:to="loc_srt_MinimumMember_019c9ac0-6c9f-7d20-bce4-b6afe4591297" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c9ac0-6c9f-7393-9c8f-f12330c92189" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6c9f-75b2-9518-e2fa12fa1712" xlink:to="loc_srt_MaximumMember_019c9ac0-6c9f-7393-9c8f-f12330c92189" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c9ac0-6c9f-7a02-93a2-cbfc08d64332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6c9f-7486-bca2-9fbf22d1c0a0" xlink:to="loc_us-gaap_AwardTypeAxis_019c9ac0-6c9f-7a02-93a2-cbfc08d64332" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6c9f-7a02-93a2-cbfc08d64332_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c9ac0-6c9f-7a02-93a2-cbfc08d64332" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6c9f-7a02-93a2-cbfc08d64332_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6c9f-731d-b41c-4030bf072fd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c9ac0-6c9f-7a02-93a2-cbfc08d64332" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6c9f-731d-b41c-4030bf072fd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6c9f-7a1f-b407-6e826efb5fd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6c9f-731d-b41c-4030bf072fd5" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6c9f-7a1f-b407-6e826efb5fd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RestrictedStockUnitsServiceGrantsMember_019c9ac0-6c9f-7252-afcb-b46dad3ee745" xlink:href="apo-20260331.xsd#apo_RestrictedStockUnitsServiceGrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6c9f-7a1f-b407-6e826efb5fd1" xlink:to="loc_apo_RestrictedStockUnitsServiceGrantsMember_019c9ac0-6c9f-7252-afcb-b46dad3ee745" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RestrictedStockUnitsPerformanceGrantsMember_019c9ac0-6c9f-7221-8dfc-16cfd22ad193" xlink:href="apo-20260331.xsd#apo_RestrictedStockUnitsPerformanceGrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6c9f-7a1f-b407-6e826efb5fd1" xlink:to="loc_apo_RestrictedStockUnitsPerformanceGrantsMember_019c9ac0-6c9f-7221-8dfc-16cfd22ad193" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019c9ac0-6c9f-76f9-a5fb-e6b7c15cc472" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6c9f-731d-b41c-4030bf072fd5" xlink:to="loc_us-gaap_RestrictedStockMember_019c9ac0-6c9f-76f9-a5fb-e6b7c15cc472" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RestrictedStockProfitSharingMember_019c9ac0-6ca0-7bb4-962d-8da39e736a1d" xlink:href="apo-20260331.xsd#apo_RestrictedStockProfitSharingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockMember_019c9ac0-6c9f-76f9-a5fb-e6b7c15cc472" xlink:to="loc_apo_RestrictedStockProfitSharingMember_019c9ac0-6ca0-7bb4-962d-8da39e736a1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019c9ac0-6ca0-7021-abd1-6c8edf921610" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6c9f-7486-bca2-9fbf22d1c0a0" xlink:to="loc_srt_TitleOfIndividualAxis_019c9ac0-6ca0-7021-abd1-6c8edf921610" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6ca0-7021-abd1-6c8edf921610_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019c9ac0-6ca0-7021-abd1-6c8edf921610" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6ca0-7021-abd1-6c8edf921610_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6ca0-7ace-92c8-ad2344f65930" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019c9ac0-6ca0-7021-abd1-6c8edf921610" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6ca0-7ace-92c8-ad2344f65930" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PresidentMember_019c9ac0-6ca0-78c4-9594-9c36ba5dd62c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_PresidentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6ca0-7ace-92c8-ad2344f65930" xlink:to="loc_srt_PresidentMember_019c9ac0-6ca0-78c4-9594-9c36ba5dd62c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019c9ac0-6ca0-7b19-9b13-5e5dc27f8536" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019c9ac0-6ca0-7b19-9b13-5e5dc27f8536" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c9ac0-6ca0-7652-ba72-625829258942" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c9ac0-6ca0-7652-ba72-625829258942" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019c9ac0-6ca0-73bb-b4ce-dd60929bc033" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019c9ac0-6ca0-73bb-b4ce-dd60929bc033" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019c9ac0-6ca0-7203-91ad-dd6d5b3cf3b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019c9ac0-6ca0-7203-91ad-dd6d5b3cf3b9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c9ac0-6ca0-73cc-b07f-9dc68778aab5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c9ac0-6ca0-73cc-b07f-9dc68778aab5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue_019c9ac0-6ca0-738f-a59a-89d5a2eb7213" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue_019c9ac0-6ca0-738f-a59a-89d5a2eb7213" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_019c9ac0-6ca0-7e4c-836a-33502edb37ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7b2d-8b35-883818eef4ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_019c9ac0-6ca0-7e4c-836a-33502edb37ff" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/EquityBasedCompensationScheduleofRSUActivityDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#EquityBasedCompensationScheduleofRSUActivityDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/EquityBasedCompensationScheduleofRSUActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7910-a811-0ed54c676338" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6ca0-7703-bc54-34b8a2f6a6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7910-a811-0ed54c676338" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6ca0-7703-bc54-34b8a2f6a6ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-76b8-93ff-b713b71b7ef2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c9ac0-6ca0-7703-bc54-34b8a2f6a6ad" xlink:to="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-76b8-93ff-b713b71b7ef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-76b8-93ff-b713b71b7ef2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-76b8-93ff-b713b71b7ef2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-76b8-93ff-b713b71b7ef2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-783c-933e-97ebeb0f7869" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-76b8-93ff-b713b71b7ef2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-783c-933e-97ebeb0f7869" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6ca0-7c40-b173-0cfd095f782e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-783c-933e-97ebeb0f7869" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6ca0-7c40-b173-0cfd095f782e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019c9ac0-6ca0-794f-b287-ea9d4949377b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7910-a811-0ed54c676338" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019c9ac0-6ca0-794f-b287-ea9d4949377b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c9ac0-6ca0-7fed-bf4c-419ecef014ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019c9ac0-6ca0-794f-b287-ea9d4949377b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c9ac0-6ca0-7fed-bf4c-419ecef014ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c9ac0-6ca0-7b27-9fa4-00e290554e6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019c9ac0-6ca0-794f-b287-ea9d4949377b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c9ac0-6ca0-7b27-9fa4-00e290554e6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c9ac0-6ca0-7fe9-9554-1567cfc45468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019c9ac0-6ca0-794f-b287-ea9d4949377b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c9ac0-6ca0-7fe9-9554-1567cfc45468" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvested_019c9ac0-6ca0-7409-bcf0-27aca0f8eb07" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019c9ac0-6ca0-794f-b287-ea9d4949377b" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvested_019c9ac0-6ca0-7409-bcf0-27aca0f8eb07" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c9ac0-6ca0-78b9-98ba-6192c8850551" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c9ac0-6ca0-7078-b2db-89c6025921d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7910-a811-0ed54c676338" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c9ac0-6ca0-7078-b2db-89c6025921d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c9ac0-6ca0-7bdd-bd4d-c584fce9a035" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c9ac0-6ca0-7078-b2db-89c6025921d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c9ac0-6ca0-7bdd-bd4d-c584fce9a035" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c9ac0-6ca0-740d-9c0a-ffe91485a8e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c9ac0-6ca0-7078-b2db-89c6025921d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c9ac0-6ca0-740d-9c0a-ffe91485a8e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c9ac0-6ca0-73ad-ad36-038e13b531bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c9ac0-6ca0-7078-b2db-89c6025921d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c9ac0-6ca0-73ad-ad36-038e13b531bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c9ac0-6ca0-7208-b21b-ed0400cd629a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c9ac0-6ca0-7078-b2db-89c6025921d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c9ac0-6ca0-7208-b21b-ed0400cd629a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c9ac0-6ca0-7f05-a00c-814b0939c5cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward_019c9ac0-6ca0-789a-9ffe-fd5a5c4ac645" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7910-a811-0ed54c676338" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward_019c9ac0-6ca0-789a-9ffe-fd5a5c4ac645" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber_019c9ac0-6ca0-73c5-8249-5e117347826b" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward_019c9ac0-6ca0-789a-9ffe-fd5a5c4ac645" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber_019c9ac0-6ca0-73c5-8249-5e117347826b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedGrantedInPeriod_019c9ac0-6ca0-77c1-ae57-bdb4549f9cdd" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedGrantedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward_019c9ac0-6ca0-789a-9ffe-fd5a5c4ac645" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedGrantedInPeriod_019c9ac0-6ca0-77c1-ae57-bdb4549f9cdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedForfeitedInPeriod_019c9ac0-6ca0-701b-b92c-a414cf8348ac" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward_019c9ac0-6ca0-789a-9ffe-fd5a5c4ac645" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedForfeitedInPeriod_019c9ac0-6ca0-701b-b92c-a414cf8348ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c9ac0-6ca0-7782-bb1f-2c00dc7c8219" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward_019c9ac0-6ca0-789a-9ffe-fd5a5c4ac645" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c9ac0-6ca0-7782-bb1f-2c00dc7c8219" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedIssuedInPeriod_019cd806-77fa-7a6d-a65c-8515f06b5434" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedRollForward_019c9ac0-6ca0-789a-9ffe-fd5a5c4ac645" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedIssuedInPeriod_019cd806-77fa-7a6d-a65c-8515f06b5434" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber_019c9ac0-6ca0-7c39-bc65-2378a235f7e3" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward_019c9ac0-6ca0-7e32-b1d9-1d0fe0a4a3cf" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c9ac0-6ca0-7910-a811-0ed54c676338" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward_019c9ac0-6ca0-7e32-b1d9-1d0fe0a4a3cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber_019c9ac0-6ca0-7dfa-b980-44ffca9d8ca9" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward_019c9ac0-6ca0-7e32-b1d9-1d0fe0a4a3cf" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber_019c9ac0-6ca0-7dfa-b980-44ffca9d8ca9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedGrantsInPeriod_019c9ac0-6ca0-7198-81d4-300eefc57c73" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward_019c9ac0-6ca0-7e32-b1d9-1d0fe0a4a3cf" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedGrantsInPeriod_019c9ac0-6ca0-7198-81d4-300eefc57c73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedForfeited_019c9ac0-6ca0-7ef9-8f23-0332bfd6d8e5" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward_019c9ac0-6ca0-7e32-b1d9-1d0fe0a4a3cf" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedForfeited_019c9ac0-6ca0-7ef9-8f23-0332bfd6d8e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVested_019c9ac0-6ca0-7885-9700-1b23a162b1c3" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward_019c9ac0-6ca0-7e32-b1d9-1d0fe0a4a3cf" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVested_019c9ac0-6ca0-7885-9700-1b23a162b1c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssued_019cd806-77fa-764d-a8e3-6a3176035569" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndVestedRollForward_019c9ac0-6ca0-7e32-b1d9-1d0fe0a4a3cf" xlink:to="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssued_019cd806-77fa-764d-a8e3-6a3176035569" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber_019c9ac0-6ca0-7198-bba0-2744c4f9e844" xlink:href="apo-20260331.xsd#apo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/EquityNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#EquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/EquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7a2e-96ac-ced6a0e000dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7a2e-96ac-ced6a0e000dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019c9ac0-6ca0-706a-8345-ae91e2f43cf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7a2e-96ac-ced6a0e000dd" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019c9ac0-6ca0-706a-8345-ae91e2f43cf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c9ac0-6ca0-706a-8345-ae91e2f43cf7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c9ac0-6ca0-706a-8345-ae91e2f43cf7" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c9ac0-6ca0-706a-8345-ae91e2f43cf7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c9ac0-6ca0-7457-af7b-fd31f6ec7dbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c9ac0-6ca0-706a-8345-ae91e2f43cf7" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c9ac0-6ca0-7457-af7b-fd31f6ec7dbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OpenMarketShareRepurchasesMember_019c9ac0-6ca0-7d65-a298-11172605f65c" xlink:href="apo-20260331.xsd#apo_OpenMarketShareRepurchasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c9ac0-6ca0-7457-af7b-fd31f6ec7dbb" xlink:to="loc_apo_OpenMarketShareRepurchasesMember_019c9ac0-6ca0-7d65-a298-11172605f65c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PrivatePlacement2022Member_019de3d0-369f-7c4c-b3c7-0b64bc467421" xlink:href="apo-20260331.xsd#apo_PrivatePlacement2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c9ac0-6ca0-7457-af7b-fd31f6ec7dbb" xlink:to="loc_apo_PrivatePlacement2022Member_019de3d0-369f-7c4c-b3c7-0b64bc467421" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PrivatePlacement2024Member_019de3d0-5c89-7615-8d75-a3ca00a010bd" xlink:href="apo-20260331.xsd#apo_PrivatePlacement2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c9ac0-6ca0-7457-af7b-fd31f6ec7dbb" xlink:to="loc_apo_PrivatePlacement2024Member_019de3d0-5c89-7615-8d75-a3ca00a010bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-7ffa-b59d-6aeb0f23d485" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7a2e-96ac-ced6a0e000dd" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-7ffa-b59d-6aeb0f23d485" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-7ffa-b59d-6aeb0f23d485_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-7ffa-b59d-6aeb0f23d485" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-7ffa-b59d-6aeb0f23d485_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-77a6-be0b-6e13ccf4e70f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-7ffa-b59d-6aeb0f23d485" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-77a6-be0b-6e13ccf4e70f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c9ac0-6ca0-7f4e-a1d1-a194613c17da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-77a6-be0b-6e13ccf4e70f" xlink:to="loc_us-gaap_CommonStockMember_019c9ac0-6ca0-7f4e-a1d1-a194613c17da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6ca0-7bcc-9db6-44f750a1e79f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7a2e-96ac-ced6a0e000dd" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6ca0-7bcc-9db6-44f750a1e79f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6ca0-7bcc-9db6-44f750a1e79f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6ca0-7bcc-9db6-44f750a1e79f" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6ca0-7bcc-9db6-44f750a1e79f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6ca0-7e47-b2dc-2b8bed0d72ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6ca0-7bcc-9db6-44f750a1e79f" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6ca0-7e47-b2dc-2b8bed0d72ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019c9ac0-6ca0-7ad2-9a31-3f7d453e997b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6ca0-7e47-b2dc-2b8bed0d72ca" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019c9ac0-6ca0-7ad2-9a31-3f7d453e997b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c9ac0-6ca0-7527-85cd-76996d3d5429" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7a2e-96ac-ced6a0e000dd" xlink:to="loc_srt_RangeAxis_019c9ac0-6ca0-7527-85cd-76996d3d5429" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6ca0-7527-85cd-76996d3d5429_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c9ac0-6ca0-7527-85cd-76996d3d5429" xlink:to="loc_srt_RangeMember_019c9ac0-6ca0-7527-85cd-76996d3d5429_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c9ac0-6ca0-7acf-99ad-70a2376a5389" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c9ac0-6ca0-7527-85cd-76996d3d5429" xlink:to="loc_srt_RangeMember_019c9ac0-6ca0-7acf-99ad-70a2376a5389" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c9ac0-6ca0-7892-a680-a21a5375a355" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6ca0-7acf-99ad-70a2376a5389" xlink:to="loc_srt_MinimumMember_019c9ac0-6ca0-7892-a680-a21a5375a355" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c9ac0-6ca0-7e36-aabb-b96766668076" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c9ac0-6ca0-7acf-99ad-70a2376a5389" xlink:to="loc_srt_MaximumMember_019c9ac0-6ca0-7e36-aabb-b96766668076" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dfab1-dbbc-7138-8225-1b086289e814" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7a2e-96ac-ced6a0e000dd" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dfab1-dbbc-7138-8225-1b086289e814" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfab1-dbbc-7138-8225-1b086289e814_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfab1-dbbc-7138-8225-1b086289e814" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfab1-dbbc-7138-8225-1b086289e814_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dfab1-dbbc-72a0-9dbd-b21b66756b28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dfab1-dbbc-7138-8225-1b086289e814" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dfab1-dbbc-72a0-9dbd-b21b66756b28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dfab1-dbbc-7571-b832-7994cf20e3e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dfab1-dbbc-72a0-9dbd-b21b66756b28" xlink:to="loc_us-gaap_SubsequentEventMember_019dfab1-dbbc-7571-b832-7994cf20e3e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c9ac0-6ca0-710d-b0cd-c830fd2c5822" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c9ac0-6ca0-710d-b0cd-c830fd2c5822" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_019c9ac0-6ca0-7ad1-9e0a-3f5f02614e4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_019c9ac0-6ca0-7ad1-9e0a-3f5f02614e4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_019c9ac0-6ca0-7b6d-8d01-a26ee177960f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_019c9ac0-6ca0-7b6d-8d01-a26ee177960f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019c9ac0-6ca0-777a-a1a1-0486693bfb38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019c9ac0-6ca0-777a-a1a1-0486693bfb38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreferenceValue_019c9ac0-6ca0-78b6-9578-119158757ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockLiquidationPreferenceValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_PreferredStockLiquidationPreferenceValue_019c9ac0-6ca0-78b6-9578-119158757ec8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_019c9ac0-6ca0-724b-82d4-c67b992cdac3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_019c9ac0-6ca0-724b-82d4-c67b992cdac3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_019c9ac0-6ca0-7b3d-8923-79a19d2dd2a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_019c9ac0-6ca0-7b3d-8923-79a19d2dd2a5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_019c9ac0-6ca0-7a05-b91a-173bff0f4f26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_019c9ac0-6ca0-7a05-b91a-173bff0f4f26" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareDeclared_019c9ac0-6ca0-7877-95e1-463cd587f037" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareDeclared_019c9ac0-6ca0-7877-95e1-463cd587f037" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_019c9ac0-6ca0-7e7a-8c93-b81b2955279f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_019c9ac0-6ca0-7e7a-8c93-b81b2955279f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ConvertiblePreferredStockThresholdTradingDays_019c9ac0-6ca0-765c-9fae-0e17c9f31c4b" xlink:href="apo-20260331.xsd#apo_ConvertiblePreferredStockThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_apo_ConvertiblePreferredStockThresholdTradingDays_019c9ac0-6ca0-765c-9fae-0e17c9f31c4b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_019c9ac0-6ca0-7f35-bac2-0be31664a903" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_PreferredStockSharesIssued_019c9ac0-6ca0-7f35-bac2-0be31664a903" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_019c9ac0-6ca0-7a38-a4a8-d5eddf1f6ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_019c9ac0-6ca0-7a38-a4a8-d5eddf1f6ee7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019c9ac0-6ca0-792c-b06a-d843f9bdb65f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019c9ac0-6ca0-792c-b06a-d843f9bdb65f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019c9ac0-6ca0-7941-9079-e82bed202f78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019c9ac0-6ca0-7941-9079-e82bed202f78" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesOther_019c9ac0-6ca0-795a-ae08-dc5a5bda4f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesOther_019c9ac0-6ca0-795a-ae08-dc5a5bda4f1a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ClassOfWarrantOrRightIncreaseInNumberExercisableDuringPeriod_019c9ac0-6ca0-7adc-a9ee-021f38a39609" xlink:href="apo-20260331.xsd#apo_ClassOfWarrantOrRightIncreaseInNumberExercisableDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_apo_ClassOfWarrantOrRightIncreaseInNumberExercisableDuringPeriod_019c9ac0-6ca0-7adc-a9ee-021f38a39609" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_019c9ac0-6ca0-7dc5-82fb-14a808d5d3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7af3-85ca-b14600803693" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_019c9ac0-6ca0-7dc5-82fb-14a808d5d3e9" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/EquityScheduleofShareActivityDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#EquityScheduleofShareActivityDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/EquityScheduleofShareActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7ba9-822e-bce6d70c0c99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7173-b7d9-ac38151df20e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7ba9-822e-bce6d70c0c99" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7173-b7d9-ac38151df20e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-768f-8d98-0aff82b12970" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7173-b7d9-ac38151df20e" xlink:to="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-768f-8d98-0aff82b12970" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-768f-8d98-0aff82b12970_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-768f-8d98-0aff82b12970" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-768f-8d98-0aff82b12970_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-77dc-9729-86785ebca8df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c9ac0-6ca0-768f-8d98-0aff82b12970" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-77dc-9729-86785ebca8df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RestrictedStockUnitsAndOptionsMember_019c9ac0-6ca0-7b8c-84d7-07634c793bcf" xlink:href="apo-20260331.xsd#apo_RestrictedStockUnitsAndOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-77dc-9729-86785ebca8df" xlink:to="loc_apo_RestrictedStockUnitsAndOptionsMember_019c9ac0-6ca0-7b8c-84d7-07634c793bcf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RestrictedStockUnitsAndShareOptionsMember_019c9ac0-6ca0-7e00-ad9b-08b31945db01" xlink:href="apo-20260331.xsd#apo_RestrictedStockUnitsAndShareOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-77dc-9729-86785ebca8df" xlink:to="loc_apo_RestrictedStockUnitsAndShareOptionsMember_019c9ac0-6ca0-7e00-ad9b-08b31945db01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6ca0-7ac1-ba31-39f2f2b77418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-77dc-9729-86785ebca8df" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c9ac0-6ca0-7ac1-ba31-39f2f2b77418" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019c9ac0-6ca0-7a84-b3c3-4b41771452a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c9ac0-6ca0-77dc-9729-86785ebca8df" xlink:to="loc_us-gaap_RestrictedStockMember_019c9ac0-6ca0-7a84-b3c3-4b41771452a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-735f-8664-c3abddff7e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019c9ac0-6ca0-7173-b7d9-ac38151df20e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-735f-8664-c3abddff7e9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-735f-8664-c3abddff7e9f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-735f-8664-c3abddff7e9f" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-735f-8664-c3abddff7e9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-7645-bc2f-fbd641f925c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6ca0-735f-8664-c3abddff7e9f" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-7645-bc2f-fbd641f925c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c9ac0-6ca0-738a-a0d0-d9f03bf177f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c9ac0-6ca0-7645-bc2f-fbd641f925c6" xlink:to="loc_us-gaap_CommonStockMember_019c9ac0-6ca0-738a-a0d0-d9f03bf177f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_019c9ac0-6ca0-792d-9db7-91a56afca119" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7ba9-822e-bce6d70c0c99" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_019c9ac0-6ca0-792d-9db7-91a56afca119" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019c9ac0-6d5c-797c-9763-21ae8bd09c53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7ba9-822e-bce6d70c0c99" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019c9ac0-6d5c-797c-9763-21ae8bd09c53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019c9ac0-6d5c-7924-b6d0-a334c0002821" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7ba9-822e-bce6d70c0c99" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019c9ac0-6d5c-7924-b6d0-a334c0002821" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_019c9ac0-6d5c-714e-b450-ec9187695631" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7ba9-822e-bce6d70c0c99" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_019c9ac0-6d5c-714e-b450-ec9187695631" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019c9ac0-6d5c-7981-bae2-f81a3e92622a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019c9ac0-6ca0-7ba9-822e-bce6d70c0c99" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019c9ac0-6d5c-7981-bae2-f81a3e92622a" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/EquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#EquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/EquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c9ac0-6d5c-74c7-a85e-4e306892283b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c9ac0-6d5c-7de9-9f14-c281a637e518" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c9ac0-6d5c-74c7-a85e-4e306892283b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c9ac0-6d5c-7de9-9f14-c281a637e518" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6d5c-7136-b5b1-96c6b96686ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c9ac0-6d5c-7de9-9f14-c281a637e518" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6d5c-7136-b5b1-96c6b96686ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6d5c-7136-b5b1-96c6b96686ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6d5c-7136-b5b1-96c6b96686ff" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6d5c-7136-b5b1-96c6b96686ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c9ac0-6d5c-781f-92e6-e96e0e749bfb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c9ac0-6d5c-7136-b5b1-96c6b96686ff" xlink:to="loc_us-gaap_EquityComponentDomain_019c9ac0-6d5c-781f-92e6-e96e0e749bfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c9ac0-6d5c-781f-92e6-e96e0e749bfb" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember_019c9ac0-6d5c-7c73-8ff7-f863a4d47ebb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember_019c9ac0-6d5c-7c73-8ff7-f863a4d47ebb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember_019c9ac0-6d5c-769f-a6b8-2aed4bf62d72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember_019c9ac0-6d5c-769f-a6b8-2aed4bf62d72" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c9ac0-6d5c-7773-a424-33fcf2d91d25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c9ac0-6d5c-7773-a424-33fcf2d91d25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RemeasurementGainLossOnFuturePolicyBenefitsRelatedToDiscountRateMember_019c9ac0-6d5c-7593-9f38-c741526ebcfd" xlink:href="apo-20260331.xsd#apo_RemeasurementGainLossOnFuturePolicyBenefitsRelatedToDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:to="loc_apo_RemeasurementGainLossOnFuturePolicyBenefitsRelatedToDiscountRateMember_019c9ac0-6d5c-7593-9f38-c741526ebcfd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RemeasurementGainLossOnMarketRiskBenefitsRelatedToCreditRiskMember_019c9ac0-6d5c-7cb1-94dc-b1d75fdefd58" xlink:href="apo-20260331.xsd#apo_RemeasurementGainLossOnMarketRiskBenefitsRelatedToCreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:to="loc_apo_RemeasurementGainLossOnMarketRiskBenefitsRelatedToCreditRiskMember_019c9ac0-6d5c-7cb1-94dc-b1d75fdefd58" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c9ac0-6d5c-725a-9ccd-58dcbdbf1e16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c9ac0-6d5c-71d3-a09a-77f8dfb9dc49" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c9ac0-6d5c-725a-9ccd-58dcbdbf1e16" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c9ac0-6d5c-790f-92ef-72840aae939e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c9ac0-6d5c-74c7-a85e-4e306892283b" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c9ac0-6d5c-790f-92ef-72840aae939e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6d5c-7a0b-92e3-62b2dfbc6171" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c9ac0-6d5c-790f-92ef-72840aae939e" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6d5c-7a0b-92e3-62b2dfbc6171" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c9ac0-6d5c-71cc-8f22-18eb621134c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c9ac0-6d5c-790f-92ef-72840aae939e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019c9ac0-6d5c-71cc-8f22-18eb621134c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019c9ac0-6d5c-7006-8bc4-289ce0d89687" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c9ac0-6d5c-790f-92ef-72840aae939e" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019c9ac0-6d5c-7006-8bc4-289ce0d89687" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_019c9ac0-6d5c-7a2c-9695-359a04b9cd6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c9ac0-6d5c-790f-92ef-72840aae939e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_019c9ac0-6d5c-7a2c-9695-359a04b9cd6f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_019c9ac0-6d5c-72ad-bd70-fa09ce585781" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c9ac0-6d5c-790f-92ef-72840aae939e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_019c9ac0-6d5c-72ad-bd70-fa09ce585781" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c9ac0-6d5c-7b0e-a0f3-ad71b39c326e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/EarningsperShareScheduleofAntidilutiveSecuritiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#EarningsperShareScheduleofAntidilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/EarningsperShareScheduleofAntidilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c9ac0-6d5c-78fa-8801-5dd6b3a38ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c9ac0-6d5c-756d-8b4d-88668a321ee2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c9ac0-6d5c-78fa-8801-5dd6b3a38ef7" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c9ac0-6d5c-756d-8b4d-88668a321ee2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c9ac0-6d5c-7293-8a78-0c8d88fde834" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c9ac0-6d5c-756d-8b4d-88668a321ee2" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c9ac0-6d5c-7293-8a78-0c8d88fde834" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7293-8a78-0c8d88fde834_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c9ac0-6d5c-7293-8a78-0c8d88fde834" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7293-8a78-0c8d88fde834_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7625-8df6-429e4bd8c643" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c9ac0-6d5c-7293-8a78-0c8d88fde834" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7625-8df6-429e4bd8c643" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RestrictedStockUnitsRSUsUnvestedMember_019c9ac0-6d5c-7751-90ba-f7e1af583463" xlink:href="apo-20260331.xsd#apo_RestrictedStockUnitsRSUsUnvestedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7625-8df6-429e4bd8c643" xlink:to="loc_apo_RestrictedStockUnitsRSUsUnvestedMember_019c9ac0-6d5c-7751-90ba-f7e1af583463" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019dbd40-668c-7a56-a9ef-5072fb8812b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7625-8df6-429e4bd8c643" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019dbd40-668c-7a56-a9ef-5072fb8812b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_019c9ac0-6d5c-791a-be3c-a29ee61998bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7625-8df6-429e4bd8c643" xlink:to="loc_us-gaap_WarrantMember_019c9ac0-6d5c-791a-be3c-a29ee61998bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019c9ac0-6d5c-73d3-97f7-df85b910a0da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7625-8df6-429e4bd8c643" xlink:to="loc_us-gaap_PreferredStockMember_019c9ac0-6d5c-73d3-97f7-df85b910a0da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019c9ac0-6d5c-75d5-8954-b75b3101e5cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c9ac0-6d5c-7625-8df6-429e4bd8c643" xlink:to="loc_us-gaap_RestrictedStockMember_019c9ac0-6d5c-75d5-8954-b75b3101e5cd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c9ac0-6d5c-727f-b456-beb86bf32eed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c9ac0-6d5c-78fa-8801-5dd6b3a38ef7" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c9ac0-6d5c-727f-b456-beb86bf32eed" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/RelatedPartiesScheduleofDueFromRelatedPartiesandDuetoRelatedPartiesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#RelatedPartiesScheduleofDueFromRelatedPartiesandDuetoRelatedPartiesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/RelatedPartiesScheduleofDueFromRelatedPartiesandDuetoRelatedPartiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-767c-8a5e-8d2d5384da0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-76df-8c43-cdb5a27525a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-767c-8a5e-8d2d5384da0c" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-76df-8c43-cdb5a27525a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-73c6-913d-102e25d92016" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-76df-8c43-cdb5a27525a8" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-73c6-913d-102e25d92016" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-73c6-913d-102e25d92016_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-73c6-913d-102e25d92016" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-73c6-913d-102e25d92016_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7d7f-97c8-39f5cf6b1af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-73c6-913d-102e25d92016" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7d7f-97c8-39f5cf6b1af1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7ea1-8f80-b9538513242a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7d7f-97c8-39f5cf6b1af1" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7ea1-8f80-b9538513242a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsMember_019c9ac0-6d5c-7c44-9c1c-52ae14d035c2" xlink:href="apo-20260331.xsd#apo_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7ea1-8f80-b9538513242a" xlink:to="loc_apo_InvestmentFundsMember_019c9ac0-6d5c-7c44-9c1c-52ae14d035c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PortfolioCompaniesMember_019c9ac0-6d5c-7233-86e0-c963a96d527e" xlink:href="apo-20260331.xsd#apo_PortfolioCompaniesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7ea1-8f80-b9538513242a" xlink:to="loc_apo_PortfolioCompaniesMember_019c9ac0-6d5c-7233-86e0-c963a96d527e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EmployeesAndFormerEmployeesMember_019c9ac0-6d5c-7399-bdeb-968780befda5" xlink:href="apo-20260331.xsd#apo_EmployeesAndFormerEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7ea1-8f80-b9538513242a" xlink:to="loc_apo_EmployeesAndFormerEmployeesMember_019c9ac0-6d5c-7399-bdeb-968780befda5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TaxReceivableAgreementHoldersMember_019c9ac0-6d5c-7648-bbb1-fccf3e6eb9bd" xlink:href="apo-20260331.xsd#apo_TaxReceivableAgreementHoldersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7ea1-8f80-b9538513242a" xlink:to="loc_apo_TaxReceivableAgreementHoldersMember_019c9ac0-6d5c-7648-bbb1-fccf3e6eb9bd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5c-7769-a0e7-78e55dd4052a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-76df-8c43-cdb5a27525a8" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5c-7769-a0e7-78e55dd4052a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5c-7769-a0e7-78e55dd4052a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5c-7769-a0e7-78e55dd4052a" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5c-7769-a0e7-78e55dd4052a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5c-769b-823e-4534556f5f06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5c-7769-a0e7-78e55dd4052a" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5c-769b-823e-4534556f5f06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5c-791c-a929-5b1f1561d164" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6d5c-769b-823e-4534556f5f06" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5c-791c-a929-5b1f1561d164" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_019c9ac0-6d5c-7848-9b83-6da318b59bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-767c-8a5e-8d2d5384da0c" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_019c9ac0-6d5c-7848-9b83-6da318b59bcd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_019c9ac0-6d5c-7447-a0e6-f06c6ce67be1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-767c-8a5e-8d2d5384da0c" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_019c9ac0-6d5c-7447-a0e6-f06c6ce67be1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/RelatedPartiesNarrativeDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#RelatedPartiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/RelatedPartiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019c9ac0-6d5c-7dd6-b234-32143e766261" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019c9ac0-6d5c-7dd6-b234-32143e766261" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7dd6-b234-32143e766261_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019c9ac0-6d5c-7dd6-b234-32143e766261" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7dd6-b234-32143e766261_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019c9ac0-6d5c-7dd6-b234-32143e766261" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TaxReceivableAgreementMember_019c9ac0-6d5c-7ad3-b85e-ecea274c9596" xlink:href="apo-20260331.xsd#apo_TaxReceivableAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_TaxReceivableAgreementMember_019c9ac0-6d5c-7ad3-b85e-ecea274c9596" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestBearingEmployeeLoansMember_019c9ac0-6d5c-76d2-b37e-1db583ed5822" xlink:href="apo-20260331.xsd#apo_InterestBearingEmployeeLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_InterestBearingEmployeeLoansMember_019c9ac0-6d5c-76d2-b37e-1db583ed5822" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EmployeeLoansProfitSharingDistributionsMember_019c9ac0-6d5c-78c8-9c36-7afa9a655edb" xlink:href="apo-20260331.xsd#apo_EmployeeLoansProfitSharingDistributionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_EmployeeLoansProfitSharingDistributionsMember_019c9ac0-6d5c-78c8-9c36-7afa9a655edb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_IndemnificationLiabilityMember_019c9ac0-6d5c-7849-a17f-d8cd2f0cb600" xlink:href="apo-20260331.xsd#apo_IndemnificationLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_IndemnificationLiabilityMember_019c9ac0-6d5c-7849-a17f-d8cd2f0cb600" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EquityCommitmentsMember_019c9ac0-6d5c-7864-8a38-a36e2cc9285b" xlink:href="apo-20260331.xsd#apo_EquityCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_EquityCommitmentsMember_019c9ac0-6d5c-7864-8a38-a36e2cc9285b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementsMember_019c9ac0-6d5c-78de-91ff-aa1ad2b80720" xlink:href="apo-20260331.xsd#apo_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_FundingAgreementsMember_019c9ac0-6d5c-78de-91ff-aa1ad2b80720" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AdditionalInvestmentsMember_019c9ac0-6d5c-7dfa-819e-4e58ab663cf5" xlink:href="apo-20260331.xsd#apo_AdditionalInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_AdditionalInvestmentsMember_019c9ac0-6d5c-7dfa-819e-4e58ab663cf5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ReinsuranceAgreementMember_019c9ac0-6d5c-73e5-bb31-6ede3e78af95" xlink:href="apo-20260331.xsd#apo_ReinsuranceAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_ReinsuranceAgreementMember_019c9ac0-6d5c-73e5-bb31-6ede3e78af95" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SkylignSeniorNotesMember_019c9ac0-6d5c-7a56-b706-0cc44834746c" xlink:href="apo-20260331.xsd#apo_SkylignSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_SkylignSeniorNotesMember_019c9ac0-6d5c-7a56-b706-0cc44834746c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AcquiredCommercialMortgageLoansFromARIMember_019c9ac0-6d5c-7f50-8a67-30625e7ad98f" xlink:href="apo-20260331.xsd#apo_AcquiredCommercialMortgageLoansFromARIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019c9ac0-6d5c-7f92-b540-f747a9dac647" xlink:to="loc_apo_AcquiredCommercialMortgageLoansFromARIMember_019c9ac0-6d5c-7f50-8a67-30625e7ad98f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7702-92b1-8d43e60ff384" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7702-92b1-8d43e60ff384" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7702-92b1-8d43e60ff384_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7702-92b1-8d43e60ff384" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7702-92b1-8d43e60ff384_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7ef8-8f82-125ef731b88b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7702-92b1-8d43e60ff384" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7ef8-8f82-125ef731b88b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-72dc-989c-b5234b4dfc42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7ef8-8f82-125ef731b88b" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-72dc-989c-b5234b4dfc42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EmployeesAndFormerEmployeesMember_019c9ac0-6d5c-7816-a262-938a5ea324a2" xlink:href="apo-20260331.xsd#apo_EmployeesAndFormerEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7ef8-8f82-125ef731b88b" xlink:to="loc_apo_EmployeesAndFormerEmployeesMember_019c9ac0-6d5c-7816-a262-938a5ea324a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_019c9ac0-6d5c-7b64-a7fa-18a7feca83b8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7ef8-8f82-125ef731b88b" xlink:to="loc_srt_SubsidiariesMember_019c9ac0-6d5c-7b64-a7fa-18a7feca83b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7245-8e46-b89cdd8fb6bc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:to="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7245-8e46-b89cdd8fb6bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7245-8e46-b89cdd8fb6bc_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7245-8e46-b89cdd8fb6bc" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7245-8e46-b89cdd8fb6bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7245-8e46-b89cdd8fb6bc" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AthoraHoldingLtdAthoraMember_019c9ac0-6d5c-793a-9601-7987d67883ac" xlink:href="apo-20260331.xsd#apo_AthoraHoldingLtdAthoraMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_AthoraHoldingLtdAthoraMember_019c9ac0-6d5c-793a-9601-7987d67883ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtlasMember_019c9ac0-6d5c-7c05-a0e6-605db1c73ed0" xlink:href="apo-20260331.xsd#apo_AtlasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_AtlasMember_019c9ac0-6d5c-7c05-a0e6-605db1c73ed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_CatalinaMember_019c9ac0-6d5c-7b53-9ce6-1f7aa207b7f1" xlink:href="apo-20260331.xsd#apo_CatalinaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_CatalinaMember_019c9ac0-6d5c-7b53-9ce6-1f7aa207b7f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SkylignAviationHoldingsLPMember_019c9ac0-6d5c-7348-b60a-f6bf7c3a9783" xlink:href="apo-20260331.xsd#apo_SkylignAviationHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_SkylignAviationHoldingsLPMember_019c9ac0-6d5c-7348-b60a-f6bf7c3a9783" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_VenerableInsuranceAndAnnuityCompanyMember_019c9ac0-6d5c-7da3-8bb1-32aea08dcd66" xlink:href="apo-20260331.xsd#apo_VenerableInsuranceAndAnnuityCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_VenerableInsuranceAndAnnuityCompanyMember_019c9ac0-6d5c-7da3-8bb1-32aea08dcd66" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_WheelsInc.Member_019c9ac0-6d5c-787a-87c4-65a68bd8c78a" xlink:href="apo-20260331.xsd#apo_WheelsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_WheelsInc.Member_019c9ac0-6d5c-787a-87c4-65a68bd8c78a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ApolloAtheneDedicatedInvestmentProgramsMember_019c9ac0-6d5c-7a08-8d6a-196d42ffbaca" xlink:href="apo-20260331.xsd#apo_ApolloAtheneDedicatedInvestmentProgramsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_ApolloAtheneDedicatedInvestmentProgramsMember_019c9ac0-6d5c-7a08-8d6a-196d42ffbaca" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ADIPMember_019c9ac0-6d5c-769d-8be8-28ab3e8b4320" xlink:href="apo-20260331.xsd#apo_ADIPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7bce-8676-eed6404c54a7" xlink:to="loc_apo_ADIPMember_019c9ac0-6d5c-769d-8be8-28ab3e8b4320" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7dfb-b5a7-4e7adb8fa14f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7dfb-b5a7-4e7adb8fa14f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-7dfb-b5a7-4e7adb8fa14f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7dfb-b5a7-4e7adb8fa14f" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-7dfb-b5a7-4e7adb8fa14f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-7768-b257-1d66185854bb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7dfb-b5a7-4e7adb8fa14f" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-7768-b257-1d66185854bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneMember_019c9ac0-6d5c-705a-981a-d689ed9a0bde" xlink:href="apo-20260331.xsd#apo_AtheneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5c-7768-b257-1d66185854bb" xlink:to="loc_apo_AtheneMember_019c9ac0-6d5c-705a-981a-d689ed9a0bde" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneLifeReLtdMember_019c9ac0-6d5c-7171-a549-7932895366c8" xlink:href="apo-20260331.xsd#apo_AtheneLifeReLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5c-7768-b257-1d66185854bb" xlink:to="loc_apo_AtheneLifeReLtdMember_019c9ac0-6d5c-7171-a549-7932895366c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ApolloAtheneDedicatedInvestmentProgramsMember_019c9ac0-6d5c-7841-8ae4-afbadf4a0305" xlink:href="apo-20260331.xsd#apo_ApolloAtheneDedicatedInvestmentProgramsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5c-7768-b257-1d66185854bb" xlink:to="loc_apo_ApolloAtheneDedicatedInvestmentProgramsMember_019c9ac0-6d5c-7841-8ae4-afbadf4a0305" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019c9ac0-6d5c-7fcb-a01a-3320141ef6db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:to="loc_srt_OwnershipAxis_019c9ac0-6d5c-7fcb-a01a-3320141ef6db" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019c9ac0-6d5c-7fcb-a01a-3320141ef6db_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019c9ac0-6d5c-7fcb-a01a-3320141ef6db" xlink:to="loc_srt_OwnershipDomain_019c9ac0-6d5c-7fcb-a01a-3320141ef6db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019c9ac0-6d5c-7549-997a-b5f8e4b7c361" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019c9ac0-6d5c-7fcb-a01a-3320141ef6db" xlink:to="loc_srt_OwnershipDomain_019c9ac0-6d5c-7549-997a-b5f8e4b7c361" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneCoInvestReinsuranceAffiliateHoldingLtdMember_019c9ac0-6d5c-7259-9b77-2ccabc8fe371" xlink:href="apo-20260331.xsd#apo_AtheneCoInvestReinsuranceAffiliateHoldingLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019c9ac0-6d5c-7549-997a-b5f8e4b7c361" xlink:to="loc_apo_AtheneCoInvestReinsuranceAffiliateHoldingLtdMember_019c9ac0-6d5c-7259-9b77-2ccabc8fe371" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneCoInvestReinsuranceAffiliateHoldingLtd2Member_019c9ac0-6d5c-7192-8aa1-00f65d72c26e" xlink:href="apo-20260331.xsd#apo_AtheneCoInvestReinsuranceAffiliateHoldingLtd2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019c9ac0-6d5c-7549-997a-b5f8e4b7c361" xlink:to="loc_apo_AtheneCoInvestReinsuranceAffiliateHoldingLtd2Member_019c9ac0-6d5c-7192-8aa1-00f65d72c26e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5c-70de-98c4-4a15951cde6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-73b4-bc13-2abc0944d4c9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5c-70de-98c4-4a15951cde6c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5c-70de-98c4-4a15951cde6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5c-70de-98c4-4a15951cde6c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5c-70de-98c4-4a15951cde6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5c-762c-9ad1-88cc0b6cb32a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5c-70de-98c4-4a15951cde6c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5c-762c-9ad1-88cc0b6cb32a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6d5c-7d88-9078-3b5c3b2c0fba" xlink:href="apo-20260331.xsd#apo_BridgeInvestmentGroupHoldingsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5c-762c-9ad1-88cc0b6cb32a" xlink:to="loc_apo_BridgeInvestmentGroupHoldingsIncMember_019c9ac0-6d5c-7d88-9078-3b5c3b2c0fba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TaxReceivableAgreementCashTaxSavings_019c9ac0-6d5c-72cb-ab73-38313817b148" xlink:href="apo-20260331.xsd#apo_TaxReceivableAgreementCashTaxSavings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_apo_TaxReceivableAgreementCashTaxSavings_019c9ac0-6d5c-72cb-ab73-38313817b148" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationTaxReceivableAgreementLiability_019c9ac0-6d5c-72b8-8aa8-24947de47489" xlink:href="apo-20260331.xsd#apo_BusinessCombinationTaxReceivableAgreementLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_apo_BusinessCombinationTaxReceivableAgreementLiability_019c9ac0-6d5c-72b8-8aa8-24947de47489" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_019c9ac0-6d5c-7ca1-ba08-c0ebe797d287" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_019c9ac0-6d5c-7ca1-ba08-c0ebe797d287" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PerformanceAllocations_019c9ac0-6d5c-7f28-9869-d493226de8c1" xlink:href="apo-20260331.xsd#apo_PerformanceAllocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_apo_PerformanceAllocations_019c9ac0-6d5c-7f28-9869-d493226de8c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019c9ac0-6d5c-7b5b-9fba-8ddb5c844953" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_OtherLiabilities_019c9ac0-6d5c-7b5b-9fba-8ddb5c844953" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019c9ac0-6d5c-74df-999b-64007d44c56f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019c9ac0-6d5c-74df-999b-64007d44c56f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_019c9ac0-6d5c-796a-8e37-f24bd653b537" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_019c9ac0-6d5c-796a-8e37-f24bd653b537" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6d5c-7de3-8385-a2dbdfdb9a4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6d5c-7de3-8385-a2dbdfdb9a4c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019c9ac0-6d5c-7102-8ec9-f362bc0a0efa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019c9ac0-6d5c-7102-8ec9-f362bc0a0efa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EconomicInterestOwnershipPercentage_019c9ac0-6d5c-7f4e-bc67-9dc212aaf969" xlink:href="apo-20260331.xsd#apo_EconomicInterestOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_apo_EconomicInterestOwnershipPercentage_019c9ac0-6d5c-7f4e-bc67-9dc212aaf969" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019c9ac0-6d5c-7028-afb7-beb976502043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019c9ac0-6d5c-7028-afb7-beb976502043" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionRate_019c9ac0-6d5c-74d7-99b3-af65014bd816" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7d18-b3ce-ceab97fafbc2" xlink:to="loc_us-gaap_RelatedPartyTransactionRate_019c9ac0-6d5c-74d7-99b3-af65014bd816" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/RelatedPartiesScheduleofAthenesInvestmentsinAthoraDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#RelatedPartiesScheduleofAthenesInvestmentsinAthoraDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/RelatedPartiesScheduleofAthenesInvestmentsinAthoraDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-71c5-95ed-df86e20b0cba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7099-bb24-76ed8905331b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-71c5-95ed-df86e20b0cba" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7099-bb24-76ed8905331b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-78cc-8bb2-74fef831c1e0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7099-bb24-76ed8905331b" xlink:to="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-78cc-8bb2-74fef831c1e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-78cc-8bb2-74fef831c1e0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-78cc-8bb2-74fef831c1e0" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-78cc-8bb2-74fef831c1e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-73fe-bfb1-44ec015c5dd1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-78cc-8bb2-74fef831c1e0" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-73fe-bfb1-44ec015c5dd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AthoraHoldingLtdAthoraMember_019c9ac0-6d5c-7e6b-950a-6b7fff02c71f" xlink:href="apo-20260331.xsd#apo_AthoraHoldingLtdAthoraMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-73fe-bfb1-44ec015c5dd1" xlink:to="loc_apo_AthoraHoldingLtdAthoraMember_019c9ac0-6d5c-7e6b-950a-6b7fff02c71f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-72c2-87ac-edeb060f0766" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7099-bb24-76ed8905331b" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-72c2-87ac-edeb060f0766" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-72c2-87ac-edeb060f0766_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-72c2-87ac-edeb060f0766" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-72c2-87ac-edeb060f0766_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7fff-bacd-4f4e51feb446" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-72c2-87ac-edeb060f0766" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7fff-bacd-4f4e51feb446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-77d7-a89c-db7e837cf61d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7fff-bacd-4f4e51feb446" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-77d7-a89c-db7e837cf61d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7d23-8bc5-c69d71f0a947" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7099-bb24-76ed8905331b" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7d23-8bc5-c69d71f0a947" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-7d23-8bc5-c69d71f0a947_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7d23-8bc5-c69d71f0a947" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-7d23-8bc5-c69d71f0a947_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-70a9-8689-b27878af19b9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7d23-8bc5-c69d71f0a947" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-70a9-8689-b27878af19b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneMember_019c9ac0-6d5c-70f1-9d69-5e2c9f87eab5" xlink:href="apo-20260331.xsd#apo_AtheneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5c-70a9-8689-b27878af19b9" xlink:to="loc_apo_AtheneMember_019c9ac0-6d5c-70f1-9d69-5e2c9f87eab5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFunds_019c9ac0-6d5c-77c1-88ba-36785a4c54ff" xlink:href="apo-20260331.xsd#apo_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-71c5-95ed-df86e20b0cba" xlink:to="loc_apo_InvestmentFunds_019c9ac0-6d5c-77c1-88ba-36785a4c54ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019d9f3b-c8d8-78ec-b369-2730d1ec7c63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-71c5-95ed-df86e20b0cba" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019d9f3b-c8d8-78ec-b369-2730d1ec7c63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019c9ac0-6d5c-7780-ba54-091ad70f18e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-71c5-95ed-df86e20b0cba" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019c9ac0-6d5c-7780-ba54-091ad70f18e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019c9ac0-6d5c-7473-929d-6806ae1bdeff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-71c5-95ed-df86e20b0cba" xlink:to="loc_us-gaap_Investments_019c9ac0-6d5c-7473-929d-6806ae1bdeff" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/RelatedPartiesScheduleofAthenesInvestmentsinVACapitalandVenerableDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#RelatedPartiesScheduleofAthenesInvestmentsinVACapitalandVenerableDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/RelatedPartiesScheduleofAthenesInvestmentsinVACapitalandVenerableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7e15-9717-2f602e646d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7bea-8473-47586d033882" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7e15-9717-2f602e646d9f" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7bea-8473-47586d033882" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7de5-8968-6a8efc893e02" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7bea-8473-47586d033882" xlink:to="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7de5-8968-6a8efc893e02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7de5-8968-6a8efc893e02_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7de5-8968-6a8efc893e02" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7de5-8968-6a8efc893e02_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-711a-b27b-36e1a2feea0e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7de5-8968-6a8efc893e02" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-711a-b27b-36e1a2feea0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_VenerableInsuranceAndAnnuityCompanyMember_019c9ac0-6d5c-7903-ab5b-a3bbc6e33e45" xlink:href="apo-20260331.xsd#apo_VenerableInsuranceAndAnnuityCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-711a-b27b-36e1a2feea0e" xlink:to="loc_apo_VenerableInsuranceAndAnnuityCompanyMember_019c9ac0-6d5c-7903-ab5b-a3bbc6e33e45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7d92-bcef-9636c6819793" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7bea-8473-47586d033882" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7d92-bcef-9636c6819793" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7d92-bcef-9636c6819793_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7d92-bcef-9636c6819793" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7d92-bcef-9636c6819793_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7330-819d-39cc84c59d33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-7d92-bcef-9636c6819793" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7330-819d-39cc84c59d33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7284-81c7-15d899bb1fec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-7330-819d-39cc84c59d33" xlink:to="loc_us-gaap_RelatedPartyMember_019c9ac0-6d5c-7284-81c7-15d899bb1fec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7b0f-b0df-717c8984edda" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7bea-8473-47586d033882" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7b0f-b0df-717c8984edda" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-7b0f-b0df-717c8984edda_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7b0f-b0df-717c8984edda" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-7b0f-b0df-717c8984edda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-7660-9e09-8c2863cf8f0a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7b0f-b0df-717c8984edda" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-7660-9e09-8c2863cf8f0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneMember_019c9ac0-6d5c-7cd6-bf6b-8f25eb696e3e" xlink:href="apo-20260331.xsd#apo_AtheneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5c-7660-9e09-8c2863cf8f0a" xlink:to="loc_apo_AtheneMember_019c9ac0-6d5c-7cd6-bf6b-8f25eb696e3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6d5c-79e8-83d0-6487d0f5e8a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7e15-9717-2f602e646d9f" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c9ac0-6d5c-79e8-83d0-6487d0f5e8a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFunds_019c9ac0-6d5c-75c4-89bf-350ee1d0494c" xlink:href="apo-20260331.xsd#apo_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7e15-9717-2f602e646d9f" xlink:to="loc_apo_InvestmentFunds_019c9ac0-6d5c-75c4-89bf-350ee1d0494c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019c9ac0-6d5c-7c68-9383-3a4c26129e53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7e15-9717-2f602e646d9f" xlink:to="loc_us-gaap_OtherInvestments_019c9ac0-6d5c-7c68-9383-3a4c26129e53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019c9ac0-6d5c-7ee8-a64f-8c1ec264a215" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-7e15-9717-2f602e646d9f" xlink:to="loc_us-gaap_Investments_019c9ac0-6d5c-7ee8-a64f-8c1ec264a215" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/RelatedPartiesScheduleofAtheneCapitalContributionsandPaidDistributionsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#RelatedPartiesScheduleofAtheneCapitalContributionsandPaidDistributionsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/RelatedPartiesScheduleofAtheneCapitalContributionsandPaidDistributionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-73d0-b94e-15b2659f7302" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7db5-96c3-564b7857f181" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-73d0-b94e-15b2659f7302" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7db5-96c3-564b7857f181" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7ec9-a581-86ac3fdb0fe1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7db5-96c3-564b7857f181" xlink:to="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7ec9-a581-86ac3fdb0fe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7ec9-a581-86ac3fdb0fe1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7ec9-a581-86ac3fdb0fe1" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7ec9-a581-86ac3fdb0fe1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7528-a36d-1c6870e64782" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5c-7ec9-a581-86ac3fdb0fe1" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7528-a36d-1c6870e64782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ApolloAtheneDedicatedInvestmentProgramsMember_019c9ac0-6d5c-7bc3-ac29-fce0dfb4fc55" xlink:href="apo-20260331.xsd#apo_ApolloAtheneDedicatedInvestmentProgramsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5c-7528-a36d-1c6870e64782" xlink:to="loc_apo_ApolloAtheneDedicatedInvestmentProgramsMember_019c9ac0-6d5c-7bc3-ac29-fce0dfb4fc55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-71d1-ae73-a258789321a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7db5-96c3-564b7857f181" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-71d1-ae73-a258789321a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-71d1-ae73-a258789321a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-71d1-ae73-a258789321a0" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-71d1-ae73-a258789321a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-77c3-840c-2b01e6e55079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c9ac0-6d5c-71d1-ae73-a258789321a0" xlink:to="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-77c3-840c-2b01e6e55079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_019c9ac0-6d5c-748a-a515-3367a96a7b98" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c9ac0-6d5c-77c3-840c-2b01e6e55079" xlink:to="loc_srt_SubsidiariesMember_019c9ac0-6d5c-748a-a515-3367a96a7b98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7faf-a4bd-8232b6032c61" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c9ac0-6d5c-7db5-96c3-564b7857f181" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7faf-a4bd-8232b6032c61" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-7faf-a4bd-8232b6032c61_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7faf-a4bd-8232b6032c61" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-7faf-a4bd-8232b6032c61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5c-7598-8293-43176567c951" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5c-7faf-a4bd-8232b6032c61" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5c-7598-8293-43176567c951" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneMember_019c9ac0-6d5c-73bd-87c2-f6cbf586a1dc" xlink:href="apo-20260331.xsd#apo_AtheneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5c-7598-8293-43176567c951" xlink:to="loc_apo_AtheneMember_019c9ac0-6d5c-73bd-87c2-f6cbf586a1dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromContributedCapital_019c9ac0-6d5c-7d15-b2ca-c96b373b994c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromContributedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-73d0-b94e-15b2659f7302" xlink:to="loc_us-gaap_ProceedsFromContributedCapital_019c9ac0-6d5c-7d15-b2ca-c96b373b994c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends_019c9ac0-6d5c-7671-879a-98cb2ace57c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019c9ac0-6d5c-73d0-b94e-15b2659f7302" xlink:to="loc_us-gaap_PaymentsOfDividends_019c9ac0-6d5c-7671-879a-98cb2ace57c1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesInvestmentCommitmentsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesInvestmentCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesInvestmentCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7ed8-906c-ec9e96b0c6d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-736f-b0f7-9685aede541f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7ed8-906c-ec9e96b0c6d3" xlink:to="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-736f-b0f7-9685aede541f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019c9ac0-6d5d-73bd-acb3-69e8f582df7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-736f-b0f7-9685aede541f" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019c9ac0-6d5d-73bd-acb3-69e8f582df7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019c9ac0-6d5d-73bd-acb3-69e8f582df7b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019c9ac0-6d5d-73bd-acb3-69e8f582df7b" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019c9ac0-6d5d-73bd-acb3-69e8f582df7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019c9ac0-6d5d-72ca-a190-d5b078734003" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019c9ac0-6d5d-73bd-acb3-69e8f582df7b" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019c9ac0-6d5d-72ca-a190-d5b078734003" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentCommitmentMember_019c9ac0-6d5d-7831-9b80-21a27dbe74ec" xlink:href="apo-20260331.xsd#apo_InvestmentCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c9ac0-6d5d-72ca-a190-d5b078734003" xlink:to="loc_apo_InvestmentCommitmentMember_019c9ac0-6d5d-7831-9b80-21a27dbe74ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_UnfundedContingentCommitmentsMember_019dbd42-eab7-7d7b-b625-34e9f5d383e9" xlink:href="apo-20260331.xsd#apo_UnfundedContingentCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c9ac0-6d5d-72ca-a190-d5b078734003" xlink:to="loc_apo_UnfundedContingentCommitmentsMember_019dbd42-eab7-7d7b-b625-34e9f5d383e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019c9ac0-6d5d-71a9-8af9-d42a7e1968b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-736f-b0f7-9685aede541f" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019c9ac0-6d5d-71a9-8af9-d42a7e1968b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019c9ac0-6d5d-71a9-8af9-d42a7e1968b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019c9ac0-6d5d-71a9-8af9-d42a7e1968b7" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019c9ac0-6d5d-71a9-8af9-d42a7e1968b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019c9ac0-6d5d-777e-b5ea-29f0384877e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019c9ac0-6d5d-71a9-8af9-d42a7e1968b7" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019c9ac0-6d5d-777e-b5ea-29f0384877e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AdditionalInvestmentsMember_019c9ac0-6d5d-7748-93f5-50adb50e13cc" xlink:href="apo-20260331.xsd#apo_AdditionalInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019c9ac0-6d5d-777e-b5ea-29f0384877e0" xlink:to="loc_apo_AdditionalInvestmentsMember_019c9ac0-6d5d-7748-93f5-50adb50e13cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019c9ac0-6d5d-7d8a-b808-798f9dd84af4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7ed8-906c-ec9e96b0c6d3" xlink:to="loc_us-gaap_OtherCommitment_019c9ac0-6d5d-7d8a-b808-798f9dd84af4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentAmount_019c9ac0-6d5d-746c-a3b4-aae0b9613d1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7ed8-906c-ec9e96b0c6d3" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentAmount_019c9ac0-6d5d-746c-a3b4-aae0b9613d1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermPurchaseCommitmentPeriod_019c9ac0-6d5d-7e7c-9fe1-9f12764b5efc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermPurchaseCommitmentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7ed8-906c-ec9e96b0c6d3" xlink:to="loc_us-gaap_LongtermPurchaseCommitmentPeriod_019c9ac0-6d5d-7e7c-9fe1-9f12764b5efc" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesContingentObligationsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesContingentObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesContingentObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7be1-9ad8-427cb8e74c80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7be1-9ad8-427cb8e74c80" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5d-72e1-9748-4b7f6c6f9f5c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7be1-9ad8-427cb8e74c80" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5d-72e1-9748-4b7f6c6f9f5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-72e1-9748-4b7f6c6f9f5c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-72e1-9748-4b7f6c6f9f5c" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-72e1-9748-4b7f6c6f9f5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-7f54-804b-5821f74db016" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-72e1-9748-4b7f6c6f9f5c" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-7f54-804b-5821f74db016" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ApolloGlobalSecuritiesLLCMember_019c9ac0-6d5d-7b41-ae21-36ded8b0aa43" xlink:href="apo-20260331.xsd#apo_ApolloGlobalSecuritiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5d-7f54-804b-5821f74db016" xlink:to="loc_apo_ApolloGlobalSecuritiesLLCMember_019c9ac0-6d5d-7b41-ae21-36ded8b0aa43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ApolloCapitalMarketsPartnershipMember_019c9ac0-6d5d-76ab-beba-efcbf151bada" xlink:href="apo-20260331.xsd#apo_ApolloCapitalMarketsPartnershipMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5d-7f54-804b-5821f74db016" xlink:to="loc_apo_ApolloCapitalMarketsPartnershipMember_019c9ac0-6d5d-76ab-beba-efcbf151bada" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7c31-8a2e-e19351dc3e2c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7be1-9ad8-427cb8e74c80" xlink:to="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7c31-8a2e-e19351dc3e2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7c31-8a2e-e19351dc3e2c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7c31-8a2e-e19351dc3e2c" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7c31-8a2e-e19351dc3e2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7a73-b312-98274bf09a86" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7c31-8a2e-e19351dc3e2c" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7a73-b312-98274bf09a86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_StateStreetGlobalAdvisorsMember_019c9ac0-6d5d-7480-a8cb-3cd7541fbda7" xlink:href="apo-20260331.xsd#apo_StateStreetGlobalAdvisorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7a73-b312-98274bf09a86" xlink:to="loc_apo_StateStreetGlobalAdvisorsMember_019c9ac0-6d5d-7480-a8cb-3cd7541fbda7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SumitomoMitsuiBankingCorpMember_019c9ac0-6d5d-7923-a380-d60b0d470783" xlink:href="apo-20260331.xsd#apo_SumitomoMitsuiBankingCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7a73-b312-98274bf09a86" xlink:to="loc_apo_SumitomoMitsuiBankingCorpMember_019c9ac0-6d5d-7923-a380-d60b0d470783" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5d-7de0-b580-d54d9fa94b18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7be1-9ad8-427cb8e74c80" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5d-7de0-b580-d54d9fa94b18" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5d-7de0-b580-d54d9fa94b18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5d-7de0-b580-d54d9fa94b18" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5d-7de0-b580-d54d9fa94b18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5d-7ff9-9bd7-48fa12c59f11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c9ac0-6d5d-7de0-b580-d54d9fa94b18" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5d-7ff9-9bd7-48fa12c59f11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_StoneTowerMember_019c9ac0-6d5d-7a6d-b360-d271da9ad13c" xlink:href="apo-20260331.xsd#apo_StoneTowerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c9ac0-6d5d-7ff9-9bd7-48fa12c59f11" xlink:to="loc_apo_StoneTowerMember_019c9ac0-6d5d-7a6d-b360-d271da9ad13c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019dbd43-218d-7f02-a734-613fa2ff1287" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7be1-9ad8-427cb8e74c80" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019dbd43-218d-7f02-a734-613fa2ff1287" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019dbd43-218d-7f02-a734-613fa2ff1287_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019dbd43-218d-7f02-a734-613fa2ff1287" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019dbd43-218d-7f02-a734-613fa2ff1287_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019dbd43-218d-79f6-a3d6-73b6a5d0734d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019dbd43-218d-7f02-a734-613fa2ff1287" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019dbd43-218d-79f6-a3d6-73b6a5d0734d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_UnfundedContingentCommitmentsMember_019dbd43-218d-7d84-8a13-df5000f31902" xlink:href="apo-20260331.xsd#apo_UnfundedContingentCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019dbd43-218d-79f6-a3d6-73b6a5d0734d" xlink:to="loc_apo_UnfundedContingentCommitmentsMember_019dbd43-218d-7d84-8a13-df5000f31902" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ContingentObligationsCumulativeRevenuesThatAreReversible_019c9ac0-6d5d-73f7-adc1-8b7c497de693" xlink:href="apo-20260331.xsd#apo_ContingentObligationsCumulativeRevenuesThatAreReversible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_apo_ContingentObligationsCumulativeRevenuesThatAreReversible_019c9ac0-6d5d-73f7-adc1-8b7c497de693" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019dbd43-218d-7ead-87ce-08e612036f45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_us-gaap_OtherCommitment_019dbd43-218d-7ead-87ce-08e612036f45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ContingentObligationsPriorDayNetAssetValueOfSecuritiesHeldBidPercentage_019c9ac0-6d5d-7646-9ec7-fcebd21b5968" xlink:href="apo-20260331.xsd#apo_ContingentObligationsPriorDayNetAssetValueOfSecuritiesHeldBidPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_apo_ContingentObligationsPriorDayNetAssetValueOfSecuritiesHeldBidPercentage_019c9ac0-6d5d-7646-9ec7-fcebd21b5968" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ContingentObligationsAdditionalWeeklyCapOfNetAssetValuePercentage_019c9ac0-6d5d-7c8a-ac87-4209938cc668" xlink:href="apo-20260331.xsd#apo_ContingentObligationsAdditionalWeeklyCapOfNetAssetValuePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_apo_ContingentObligationsAdditionalWeeklyCapOfNetAssetValuePercentage_019c9ac0-6d5d-7c8a-ac87-4209938cc668" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ContingentObligationsNumberOfTradingDaysPriorOfNetAssetValue_019c9ac0-6d5d-75e7-8300-c4a240d35b8b" xlink:href="apo-20260331.xsd#apo_ContingentObligationsNumberOfTradingDaysPriorOfNetAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_apo_ContingentObligationsNumberOfTradingDaysPriorOfNetAssetValue_019c9ac0-6d5d-75e7-8300-c4a240d35b8b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c9ac0-6d5d-702c-954b-58e9c59b8eda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c9ac0-6d5d-702c-954b-58e9c59b8eda" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019c9ac0-6d5d-7134-8d37-eebf99e08ac1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_us-gaap_LineOfCredit_019c9ac0-6d5d-7134-8d37-eebf99e08ac1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_BusinessCombinationContingentConsiderationFairValueDisclosure_019c9ac0-6d5d-7da3-90ff-f516647fac5d" xlink:href="apo-20260331.xsd#apo_BusinessCombinationContingentConsiderationFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7536-92b5-fbc9d4de081c" xlink:to="loc_apo_BusinessCombinationContingentConsiderationFairValueDisclosure_019c9ac0-6d5d-7da3-90ff-f516647fac5d" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesIndemnificationsandContingentPerformanceGuaranteesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesIndemnificationsandContingentPerformanceGuaranteesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesIndemnificationsandContingentPerformanceGuaranteesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7795-930b-e6b7fd2e2421" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-789d-b0bf-30a2e8c82c5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7795-930b-e6b7fd2e2421" xlink:to="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-789d-b0bf-30a2e8c82c5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c9ac0-6d5d-7369-b6be-7d439188605a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-789d-b0bf-30a2e8c82c5c" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c9ac0-6d5d-7369-b6be-7d439188605a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019c9ac0-6d5d-7369-b6be-7d439188605a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c9ac0-6d5d-7369-b6be-7d439188605a" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019c9ac0-6d5d-7369-b6be-7d439188605a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019c9ac0-6d5d-7dea-a37e-790874654112" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019c9ac0-6d5d-7369-b6be-7d439188605a" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019c9ac0-6d5d-7dea-a37e-790874654112" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_019c9ac0-6d5d-7bf6-96af-0fd6f4bffdf5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019c9ac0-6d5d-7dea-a37e-790874654112" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_019c9ac0-6d5d-7bf6-96af-0fd6f4bffdf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019c9ac0-6d5d-7a2f-b6de-c99a81ee7664" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7795-930b-e6b7fd2e2421" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019c9ac0-6d5d-7a2f-b6de-c99a81ee7664" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesFundingAgreementsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesFundingAgreementsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesFundingAgreementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7961-b3ee-ee4a5a1adba6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-78a2-ba90-5f9a823afeb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7961-b3ee-ee4a5a1adba6" xlink:to="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-78a2-ba90-5f9a823afeb3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementAxis_019c9ac0-6d5d-780b-9e00-f1ec33ce2f7b" xlink:href="apo-20260331.xsd#apo_FundingAgreementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-78a2-ba90-5f9a823afeb3" xlink:to="loc_apo_FundingAgreementAxis_019c9ac0-6d5d-780b-9e00-f1ec33ce2f7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-780b-9e00-f1ec33ce2f7b_default" xlink:href="apo-20260331.xsd#apo_FundingAgreementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_apo_FundingAgreementAxis_019c9ac0-6d5d-780b-9e00-f1ec33ce2f7b" xlink:to="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-780b-9e00-f1ec33ce2f7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-7dc0-9d63-e96dd5f29c8d" xlink:href="apo-20260331.xsd#apo_FundingAgreementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_apo_FundingAgreementAxis_019c9ac0-6d5d-780b-9e00-f1ec33ce2f7b" xlink:to="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-7dc0-9d63-e96dd5f29c8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FederalHomeLoanBankMember_019c9ac0-6d5d-720a-bcd3-348427bd950b" xlink:href="apo-20260331.xsd#apo_FederalHomeLoanBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-7dc0-9d63-e96dd5f29c8d" xlink:to="loc_apo_FederalHomeLoanBankMember_019c9ac0-6d5d-720a-bcd3-348427bd950b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementBackedNotesMember_019c9ac0-6d5d-744c-bf34-5a1fa49f2f55" xlink:href="apo-20260331.xsd#apo_FundingAgreementBackedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-7dc0-9d63-e96dd5f29c8d" xlink:to="loc_apo_FundingAgreementBackedNotesMember_019c9ac0-6d5d-744c-bf34-5a1fa49f2f55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementBackedRepurchaseAgreementMember_019c9ac0-6d5d-7a23-a4a3-dc3b252af56f" xlink:href="apo-20260331.xsd#apo_FundingAgreementBackedRepurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-7dc0-9d63-e96dd5f29c8d" xlink:to="loc_apo_FundingAgreementBackedRepurchaseAgreementMember_019c9ac0-6d5d-7a23-a4a3-dc3b252af56f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SecuredAndOtherFundingAgreementsMember_019c9ac0-6d5d-7038-a8dd-d945f6a5f711" xlink:href="apo-20260331.xsd#apo_SecuredAndOtherFundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-7dc0-9d63-e96dd5f29c8d" xlink:to="loc_apo_SecuredAndOtherFundingAgreementsMember_019c9ac0-6d5d-7038-a8dd-d945f6a5f711" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DirectFundingAgreementMember_019c9ac0-6d5d-7e9c-bb6e-98780ee22f41" xlink:href="apo-20260331.xsd#apo_DirectFundingAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_FundingAgreementDomain_019c9ac0-6d5d-7dc0-9d63-e96dd5f29c8d" xlink:to="loc_apo_DirectFundingAgreementMember_019c9ac0-6d5d-7e9c-bb6e-98780ee22f41" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5d-79bc-b711-9d57baa83311" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-78a2-ba90-5f9a823afeb3" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5d-79bc-b711-9d57baa83311" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-79bc-b711-9d57baa83311_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-79bc-b711-9d57baa83311" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-79bc-b711-9d57baa83311_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-7ebb-b0a6-ccb7ca20fa7c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-79bc-b711-9d57baa83311" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-7ebb-b0a6-ccb7ca20fa7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6d5d-7f83-a9a0-7390af2fd93e" xlink:href="apo-20260331.xsd#apo_AtheneHoldingLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5d-7ebb-b0a6-ccb7ca20fa7c" xlink:to="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6d5d-7f83-a9a0-7390af2fd93e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementsOutstandingAmount_019c9ac0-6d5d-7b1f-8f80-bc8f8b3c38f9" xlink:href="apo-20260331.xsd#apo_FundingAgreementsOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7961-b3ee-ee4a5a1adba6" xlink:to="loc_apo_FundingAgreementsOutstandingAmount_019c9ac0-6d5d-7b1f-8f80-bc8f8b3c38f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FundingAgreementsRemainingCapacity_019c9ac0-6d5d-7382-b517-cacaa2bb6d01" xlink:href="apo-20260331.xsd#apo_FundingAgreementsRemainingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7961-b3ee-ee4a5a1adba6" xlink:to="loc_apo_FundingAgreementsRemainingCapacity_019c9ac0-6d5d-7382-b517-cacaa2bb6d01" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesScheduleofRestrictedAssetsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesScheduleofRestrictedAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesScheduleofRestrictedAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralTable_019c9ac0-6d5d-7725-97d4-62766e0c1fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralTable_019c9ac0-6d5d-7725-97d4-62766e0c1fc9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7b2f-9515-1df90a0612db" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralTable_019c9ac0-6d5d-7725-97d4-62766e0c1fc9" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7b2f-9515-1df90a0612db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-7b2f-9515-1df90a0612db_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7b2f-9515-1df90a0612db" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-7b2f-9515-1df90a0612db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-7f21-8205-192a792f83a1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7b2f-9515-1df90a0612db" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-7f21-8205-192a792f83a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6d5d-7cc7-bbc5-a6a2124678c5" xlink:href="apo-20260331.xsd#apo_AtheneHoldingLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5d-7f21-8205-192a792f83a1" xlink:to="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6d5d-7cc7-bbc5-a6a2124678c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_019c9ac0-6d5d-7cb4-989f-bfe31f0e5efc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_019c9ac0-6d5d-7cb4-989f-bfe31f0e5efc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingRestricted_019c9ac0-6d5d-7c0e-8c1e-8a929e8571a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesTradingRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_us-gaap_DebtSecuritiesTradingRestricted_019c9ac0-6d5d-7c0e-8c1e-8a929e8571a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiRestricted_019c9ac0-6d5d-730c-afda-40b10b5feb2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_us-gaap_EquitySecuritiesFvNiRestricted_019c9ac0-6d5d-730c-afda-40b10b5feb2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_MortgageLoansRestricted_019c9ac0-6d5d-75c6-a34a-671fc0d6a955" xlink:href="apo-20260331.xsd#apo_MortgageLoansRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_apo_MortgageLoansRestricted_019c9ac0-6d5d-75c6-a34a-671fc0d6a955" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InvestmentFundsRestricted_019c9ac0-6d5d-7c95-8e55-6c89a6c1c447" xlink:href="apo-20260331.xsd#apo_InvestmentFundsRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_apo_InvestmentFundsRestricted_019c9ac0-6d5d-7c95-8e55-6c89a6c1c447" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_DerivativeAssetsRestricted_019c9ac0-6d5d-76aa-823b-6e2a44a2ed47" xlink:href="apo-20260331.xsd#apo_DerivativeAssetsRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_apo_DerivativeAssetsRestricted_019c9ac0-6d5d-76aa-823b-6e2a44a2ed47" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherInvestmentsRestricted_019c9ac0-6d5d-749c-a022-e61b6fbfadb3" xlink:href="apo-20260331.xsd#apo_OtherInvestmentsRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_apo_OtherInvestmentsRestricted_019c9ac0-6d5d-749c-a022-e61b6fbfadb3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019c9ac0-6d5d-7a5c-a05d-741c9f0ce7ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019c9ac0-6d5d-7a5c-a05d-741c9f0ce7ec" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TotalRestrictedAssets_019c9ac0-6d5d-7999-86b8-9cc8f298e437" xlink:href="apo-20260331.xsd#apo_TotalRestrictedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems_019c9ac0-6d5d-7bc1-8868-0076dde6c2b4" xlink:to="loc_apo_TotalRestrictedAssets_019c9ac0-6d5d-7999-86b8-9cc8f298e437" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesLettersofCreditDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesLettersofCreditDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesLettersofCreditDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7dd3-8145-fd2b50bb619c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7f1b-abcb-735835b97560" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7dd3-8145-fd2b50bb619c" xlink:to="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7f1b-abcb-735835b97560" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6d5d-7135-8f7b-9af2cfeaedae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7f1b-abcb-735835b97560" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6d5d-7135-8f7b-9af2cfeaedae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6d5d-7135-8f7b-9af2cfeaedae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6d5d-7135-8f7b-9af2cfeaedae" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6d5d-7135-8f7b-9af2cfeaedae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6d5d-7f77-aed2-7734bf338483" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c9ac0-6d5d-7135-8f7b-9af2cfeaedae" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6d5d-7f77-aed2-7734bf338483" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_019c9ac0-6d5d-7cb6-8978-66048eed3baf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c9ac0-6d5d-7f77-aed2-7734bf338483" xlink:to="loc_us-gaap_LetterOfCreditMember_019c9ac0-6d5d-7cb6-8978-66048eed3baf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7601-aab9-d199f2732bb5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7f1b-abcb-735835b97560" xlink:to="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7601-aab9-d199f2732bb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-7601-aab9-d199f2732bb5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7601-aab9-d199f2732bb5" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-7601-aab9-d199f2732bb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c9ac0-6d5d-7b69-b833-618368814384" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c9ac0-6d5d-7601-aab9-d199f2732bb5" xlink:to="loc_dei_EntityDomain_019c9ac0-6d5d-7b69-b833-618368814384" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6d5d-7c9c-8f9e-04469ad5a142" xlink:href="apo-20260331.xsd#apo_AtheneHoldingLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c9ac0-6d5d-7b69-b833-618368814384" xlink:to="loc_apo_AtheneHoldingLimitedMember_019c9ac0-6d5d-7c9c-8f9e-04469ad5a142" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019c9ac0-6d5d-7caa-bfda-4812a14e794b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7dd3-8145-fd2b50bb619c" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019c9ac0-6d5d-7caa-bfda-4812a14e794b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesAtlasDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesAtlasDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesAtlasDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7476-804f-896d4aecca15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7ad3-8cb4-495c24f929bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7476-804f-896d4aecca15" xlink:to="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7ad3-8cb4-495c24f929bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7106-aa49-5b39af5f3ba6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-7ad3-8cb4-495c24f929bc" xlink:to="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7106-aa49-5b39af5f3ba6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7106-aa49-5b39af5f3ba6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7106-aa49-5b39af5f3ba6" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7106-aa49-5b39af5f3ba6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-76b0-81e5-243594c5156f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7106-aa49-5b39af5f3ba6" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-76b0-81e5-243594c5156f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AtlasMember_019c9ac0-6d5d-7444-affa-223d33bf8d42" xlink:href="apo-20260331.xsd#apo_AtlasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-76b0-81e5-243594c5156f" xlink:to="loc_apo_AtlasMember_019c9ac0-6d5d-7444-affa-223d33bf8d42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NumberOfTransactions_019c9ac0-6d5d-7e66-830a-35459f3dc5a1" xlink:href="apo-20260331.xsd#apo_NumberOfTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7476-804f-896d4aecca15" xlink:to="loc_apo_NumberOfTransactions_019c9ac0-6d5d-7e66-830a-35459f3dc5a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_019c9ac0-6d5d-7190-9586-fafcf011623f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7476-804f-896d4aecca15" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_019c9ac0-6d5d-7190-9586-fafcf011623f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019c9ac0-6d5d-708c-b458-e56d0191f638" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7476-804f-896d4aecca15" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019c9ac0-6d5d-708c-b458-e56d0191f638" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/CommitmentsandContingenciesLitigationandRegulatoryMattersDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#CommitmentsandContingenciesLitigationandRegulatoryMattersDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/CommitmentsandContingenciesLitigationandRegulatoryMattersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7818-8244-9ccaf05adbcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-70cf-a3ba-3324064aae42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7818-8244-9ccaf05adbcc" xlink:to="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-70cf-a3ba-3324064aae42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_019c9ac0-6d5d-72fe-a492-3ea08501c502" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-70cf-a3ba-3324064aae42" xlink:to="loc_srt_LitigationCaseAxis_019c9ac0-6d5d-72fe-a492-3ea08501c502" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-72fe-a492-3ea08501c502_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_019c9ac0-6d5d-72fe-a492-3ea08501c502" xlink:to="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-72fe-a492-3ea08501c502_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-759b-8d50-758066375777" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_019c9ac0-6d5d-72fe-a492-3ea08501c502" xlink:to="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-759b-8d50-758066375777" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_HarbingerCapitalPartnersIILPEtAlVApolloGlobalManagementLLCEtAlNo6575152017Member_019c9ac0-6d5d-760e-8be2-9556d977612d" xlink:href="apo-20260331.xsd#apo_HarbingerCapitalPartnersIILPEtAlVApolloGlobalManagementLLCEtAlNo6575152017Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-759b-8d50-758066375777" xlink:to="loc_apo_HarbingerCapitalPartnersIILPEtAlVApolloGlobalManagementLLCEtAlNo6575152017Member_019c9ac0-6d5d-760e-8be2-9556d977612d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AnguillaSocialSecurityBoardVsBlackEtAlMember_019c9ac0-6d5d-7064-a3c3-72634b3a724d" xlink:href="apo-20260331.xsd#apo_AnguillaSocialSecurityBoardVsBlackEtAlMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-759b-8d50-758066375777" xlink:to="loc_apo_AnguillaSocialSecurityBoardVsBlackEtAlMember_019c9ac0-6d5d-7064-a3c3-72634b3a724d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AGMStockholderAgreementComplaintMember_019c9ac0-6d5d-7845-a509-cb930f485aa3" xlink:href="apo-20260331.xsd#apo_AGMStockholderAgreementComplaintMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-759b-8d50-758066375777" xlink:to="loc_apo_AGMStockholderAgreementComplaintMember_019c9ac0-6d5d-7845-a509-cb930f485aa3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ViolationOfFederalSecuritiesLawMember_019de3d5-8a69-7507-b11c-d35abad7d4ab" xlink:href="apo-20260331.xsd#apo_ViolationOfFederalSecuritiesLawMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019c9ac0-6d5d-759b-8d50-758066375777" xlink:to="loc_apo_ViolationOfFederalSecuritiesLawMember_019de3d5-8a69-7507-b11c-d35abad7d4ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7de2-8de6-d10d151723c6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-70cf-a3ba-3324064aae42" xlink:to="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7de2-8de6-d10d151723c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7de2-8de6-d10d151723c6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7de2-8de6-d10d151723c6" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7de2-8de6-d10d151723c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7a92-8f99-5fb1239ad51e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c9ac0-6d5d-7de2-8de6-d10d151723c6" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7a92-8f99-5fb1239ad51e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_SkyTerraMember_019c9ac0-6d5d-7d6f-ba8a-99218300f697" xlink:href="apo-20260331.xsd#apo_SkyTerraMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c9ac0-6d5d-7a92-8f99-5fb1239ad51e" xlink:to="loc_apo_SkyTerraMember_019c9ac0-6d5d-7d6f-ba8a-99218300f697" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019c9ac0-6d5d-7538-b207-a8fba62a6bb1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c9ac0-6d5d-70cf-a3ba-3324064aae42" xlink:to="loc_srt_TitleOfIndividualAxis_019c9ac0-6d5d-7538-b207-a8fba62a6bb1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6d5d-7538-b207-a8fba62a6bb1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019c9ac0-6d5d-7538-b207-a8fba62a6bb1" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6d5d-7538-b207-a8fba62a6bb1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6d5d-78b7-9b5e-10ce389ee085" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019c9ac0-6d5d-7538-b207-a8fba62a6bb1" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6d5d-78b7-9b5e-10ce389ee085" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ConsultantMember_019c9ac0-6d5d-736a-9cf7-32304b72cc80" xlink:href="apo-20260331.xsd#apo_ConsultantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6d5d-78b7-9b5e-10ce389ee085" xlink:to="loc_apo_ConsultantMember_019c9ac0-6d5d-736a-9cf7-32304b72cc80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExecutiveOfficerMember_019c9ac0-6d5d-78b5-9340-6103f26b54cd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c9ac0-6d5d-78b7-9b5e-10ce389ee085" xlink:to="loc_srt_ExecutiveOfficerMember_019c9ac0-6d5d-78b5-9340-6103f26b54cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_019c9ac0-6d5d-7ba5-a180-18f8e09872e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7818-8244-9ccaf05adbcc" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_019c9ac0-6d5d-7ba5-a180-18f8e09872e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfDefendants_019c9ac0-6d5d-7f69-8955-ae90dae72fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNumberOfDefendants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7818-8244-9ccaf05adbcc" xlink:to="loc_us-gaap_LossContingencyNumberOfDefendants_019c9ac0-6d5d-7f69-8955-ae90dae72fcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_LossContingencyPaymentsBeingChallengedAmount_019c9ac0-6d5d-7094-b31c-d5e887c18df8" xlink:href="apo-20260331.xsd#apo_LossContingencyPaymentsBeingChallengedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7818-8244-9ccaf05adbcc" xlink:to="loc_apo_LossContingencyPaymentsBeingChallengedAmount_019c9ac0-6d5d-7094-b31c-d5e887c18df8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_019c9ac0-6d5d-72ed-9fa2-5a6f4a2005b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7818-8244-9ccaf05adbcc" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_019c9ac0-6d5d-72ed-9fa2-5a6f4a2005b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNewClaimsFiledNumber_019de3da-5d86-73cf-8732-5b70c7016155" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNewClaimsFiledNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c9ac0-6d5d-7818-8244-9ccaf05adbcc" xlink:to="loc_us-gaap_LossContingencyNewClaimsFiledNumber_019de3da-5d86-73cf-8732-5b70c7016155" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/SegmentsScheduleofFinancialDataforReportableSegmentsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#SegmentsScheduleofFinancialDataforReportableSegmentsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/SegmentsScheduleofFinancialDataforReportableSegmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-7cb4-8c43-92863d36ff95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-7cb4-8c43-92863d36ff95" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7cfd-ab2a-7966f7dcec09" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-7cb4-8c43-92863d36ff95" xlink:to="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7cfd-ab2a-7966f7dcec09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7cfd-ab2a-7966f7dcec09_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7cfd-ab2a-7966f7dcec09" xlink:to="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7cfd-ab2a-7966f7dcec09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7787-900e-f4d0819763b6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7cfd-ab2a-7966f7dcec09" xlink:to="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7787-900e-f4d0819763b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c9ac0-6d5d-7907-b5b0-a158d9b22f31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7787-900e-f4d0819763b6" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c9ac0-6d5d-7907-b5b0-a158d9b22f31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019c9ac0-6d5d-7c80-998d-8d040be5c95f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7787-900e-f4d0819763b6" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019c9ac0-6d5d-7c80-998d-8d040be5c95f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c9ac0-6d5d-7798-8ae2-7ea1acb90e97" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-7cb4-8c43-92863d36ff95" xlink:to="loc_srt_ProductOrServiceAxis_019c9ac0-6d5d-7798-8ae2-7ea1acb90e97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6d5d-7798-8ae2-7ea1acb90e97_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6d5d-7798-8ae2-7ea1acb90e97" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6d5d-7798-8ae2-7ea1acb90e97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c9ac0-6d5d-703d-9f77-c10737e7e816" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c9ac0-6d5d-7798-8ae2-7ea1acb90e97" xlink:to="loc_srt_ProductsAndServicesDomain_019c9ac0-6d5d-703d-9f77-c10737e7e816" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetManagement1Member_019c9ac0-6d5d-7f96-b459-a0aa565be12b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetManagement1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6d5d-703d-9f77-c10737e7e816" xlink:to="loc_us-gaap_AssetManagement1Member_019c9ac0-6d5d-7f96-b459-a0aa565be12b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAdviceMember_019c9ac0-6d5d-7148-a13f-71af2fae9452" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentAdviceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6d5d-703d-9f77-c10737e7e816" xlink:to="loc_us-gaap_InvestmentAdviceMember_019c9ac0-6d5d-7148-a13f-71af2fae9452" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019d1a7b-9e44-786f-babb-776de1ed8764" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c9ac0-6d5d-703d-9f77-c10737e7e816" xlink:to="loc_apo_RetirementServicesSegmentMember_019d1a7b-9e44-786f-babb-776de1ed8764" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-73d4-abde-2b383a6d0d54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-7cb4-8c43-92863d36ff95" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-73d4-abde-2b383a6d0d54" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-73d4-abde-2b383a6d0d54_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-73d4-abde-2b383a6d0d54" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-73d4-abde-2b383a6d0d54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7d28-b418-23c4b4b9f5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-73d4-abde-2b383a6d0d54" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7d28-b418-23c4b4b9f5a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5d-797a-9eb0-9a6868eff00d" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7d28-b418-23c4b4b9f5a9" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5d-797a-9eb0-9a6868eff00d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6d5d-7855-9c1b-50824baa394f" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7d28-b418-23c4b4b9f5a9" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6d5d-7855-9c1b-50824baa394f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PrincipalInvestingSegmentMember_019c9ac0-6d5d-7a43-a2a6-21eb0167f891" xlink:href="apo-20260331.xsd#apo_PrincipalInvestingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7d28-b418-23c4b4b9f5a9" xlink:to="loc_apo_PrincipalInvestingSegmentMember_019c9ac0-6d5d-7a43-a2a6-21eb0167f891" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c9ac0-6d5d-7f84-85c9-75079df29419" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c9ac0-6d5d-7f84-85c9-75079df29419" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FeeRelatedPerformanceFees_019c9ac0-6d5d-7f7a-8ecc-20841117bc53" xlink:href="apo-20260331.xsd#apo_FeeRelatedPerformanceFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_FeeRelatedPerformanceFees_019c9ac0-6d5d-7f7a-8ecc-20841117bc53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FeeRelatedCompensation_019c9ac0-6d5d-769e-8a38-e41a3174ed6d" xlink:href="apo-20260331.xsd#apo_FeeRelatedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_FeeRelatedCompensation_019c9ac0-6d5d-769e-8a38-e41a3174ed6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_019c9ac0-6d5d-7929-8f61-fdb5a5d770b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_019c9ac0-6d5d-7929-8f61-fdb5a5d770b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_FixedIncomeAndOtherInvestmentIncomeNet_019c9ac0-6d5d-7105-8c99-26c663b580f5" xlink:href="apo-20260331.xsd#apo_FixedIncomeAndOtherInvestmentIncomeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_FixedIncomeAndOtherInvestmentIncomeNet_019c9ac0-6d5d-7105-8c99-26c663b580f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AlternativeInvestmentIncomeNet_019c9ac0-6d5d-7e2e-8c2a-697935f28697" xlink:href="apo-20260331.xsd#apo_AlternativeInvestmentIncomeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_AlternativeInvestmentIncomeNet_019c9ac0-6d5d-7e2e-8c2a-697935f28697" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_StrategicCapitalManagementIncome_019c9ac0-6d5d-743e-bf2c-12a91354dc5c" xlink:href="apo-20260331.xsd#apo_StrategicCapitalManagementIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_StrategicCapitalManagementIncome_019c9ac0-6d5d-743e-bf2c-12a91354dc5c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_CostOfFunds_019c9ac0-6d5d-734b-9c37-c117f2d158de" xlink:href="apo-20260331.xsd#apo_CostOfFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_CostOfFunds_019c9ac0-6d5d-734b-9c37-c117f2d158de" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestAndOtherFinancingCosts_019c9ac0-6d5d-74f8-820b-fb6837e10a15" xlink:href="apo-20260331.xsd#apo_InterestAndOtherFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_InterestAndOtherFinancingCosts_019c9ac0-6d5d-74f8-820b-fb6837e10a15" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RealizedPerformanceFee_019c9ac0-6d5d-7466-ae67-3c85e825efb8" xlink:href="apo-20260331.xsd#apo_RealizedPerformanceFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_RealizedPerformanceFee_019c9ac0-6d5d-7466-ae67-3c85e825efb8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RealizedInvestmentIncome_019c9ac0-6d5d-7788-9e5e-f2615dd9050d" xlink:href="apo-20260331.xsd#apo_RealizedInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_RealizedInvestmentIncome_019c9ac0-6d5d-7788-9e5e-f2615dd9050d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PrincipalInvestingCompensation_019c9ac0-6d5d-7ed6-a90c-f20c48199a9e" xlink:href="apo-20260331.xsd#apo_PrincipalInvestingCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_PrincipalInvestingCompensation_019c9ac0-6d5d-7ed6-a90c-f20c48199a9e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AdjustedSegmentIncomeLoss_019c9ac0-6d5d-7557-836e-e543f3d08d2a" xlink:href="apo-20260331.xsd#apo_AdjustedSegmentIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_apo_AdjustedSegmentIncomeLoss_019c9ac0-6d5d-7557-836e-e543f3d08d2a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c9ac0-6d5d-77cc-a0bb-3df6edb34dec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_us-gaap_Revenues_019c9ac0-6d5d-77cc-a0bb-3df6edb34dec" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c9ac0-6d5d-77cb-af25-e47e4e9ccba0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-785d-be49-0d67b456258d" xlink:to="loc_us-gaap_Assets_019c9ac0-6d5d-77cb-af25-e47e4e9ccba0" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/SegmentsScheduleofReconciliationofSegmentIncometoIncomeLossBeforeIncomeTaxProvisionBenefitDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#SegmentsScheduleofReconciliationofSegmentIncometoIncomeLossBeforeIncomeTaxProvisionBenefitDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/SegmentsScheduleofReconciliationofSegmentIncometoIncomeLossBeforeIncomeTaxProvisionBenefitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019c9ac0-6d5d-7b4f-81aa-df21a09ae55b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019c9ac0-6d5d-7b4f-81aa-df21a09ae55b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74c0-868d-3376e549ce01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019c9ac0-6d5d-7b4f-81aa-df21a09ae55b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74c0-868d-3376e549ce01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-74c0-868d-3376e549ce01_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74c0-868d-3376e549ce01" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-74c0-868d-3376e549ce01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-71c0-8a2b-4cfc5a18c51e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74c0-868d-3376e549ce01" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-71c0-8a2b-4cfc5a18c51e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementAndRetirementSegmentsMember_019c9ac0-6d5d-7cfa-9ac0-bda2de0c4704" xlink:href="apo-20260331.xsd#apo_AssetManagementAndRetirementSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-71c0-8a2b-4cfc5a18c51e" xlink:to="loc_apo_AssetManagementAndRetirementSegmentsMember_019c9ac0-6d5d-7cfa-9ac0-bda2de0c4704" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5d-7240-924f-4128ee67d62f" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_AssetManagementAndRetirementSegmentsMember_019c9ac0-6d5d-7cfa-9ac0-bda2de0c4704" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5d-7240-924f-4128ee67d62f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6d5d-76ee-8e00-0a737938a9a6" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_AssetManagementAndRetirementSegmentsMember_019c9ac0-6d5d-7cfa-9ac0-bda2de0c4704" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6d5d-76ee-8e00-0a737938a9a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c9ac0-6d5d-7c2f-9dc4-645d845aca7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c9ac0-6d5d-7c2f-9dc4-645d845aca7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EquityBasedProfitSharingExpense_019c9ac0-6d5d-7b4b-a930-070ed5ae6567" xlink:href="apo-20260331.xsd#apo_EquityBasedProfitSharingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_EquityBasedProfitSharingExpense_019c9ac0-6d5d-7b4b-a930-070ed5ae6567" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c9ac0-6d5d-7c65-8363-0e142248b31b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c9ac0-6d5d-7c65-8363-0e142248b31b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NetIncomeLossAttributableToNoncontrollingInterestAdjusted_019c9ac0-6d5d-7c56-a6c3-9119de0a377d" xlink:href="apo-20260331.xsd#apo_NetIncomeLossAttributableToNoncontrollingInterestAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_NetIncomeLossAttributableToNoncontrollingInterestAdjusted_019c9ac0-6d5d-7c56-a6c3-9119de0a377d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_UnrealizedPerformanceFees_019c9ac0-6d5d-7473-a823-6a37cd0dd384" xlink:href="apo-20260331.xsd#apo_UnrealizedPerformanceFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_UnrealizedPerformanceFees_019c9ac0-6d5d-7473-a823-6a37cd0dd384" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_UnrealizedProfitSharingExpense_019c9ac0-6d5d-7d57-9c41-f8139c3c6507" xlink:href="apo-20260331.xsd#apo_UnrealizedProfitSharingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_UnrealizedProfitSharingExpense_019c9ac0-6d5d-7d57-9c41-f8139c3c6507" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_InterestAndOtherFinancingCosts_019c9ac0-6d5d-7b88-993b-42b34d5bdb2b" xlink:href="apo-20260331.xsd#apo_InterestAndOtherFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_InterestAndOtherFinancingCosts_019c9ac0-6d5d-7b88-993b-42b34d5bdb2b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_UnrealizedPrincipalInvestmentIncomeLoss_019c9ac0-6d5d-7c6e-8c97-1fa660969907" xlink:href="apo-20260331.xsd#apo_UnrealizedPrincipalInvestmentIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_UnrealizedPrincipalInvestmentIncomeLoss_019c9ac0-6d5d-7c6e-8c97-1fa660969907" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_019c9ac0-6d5d-785e-8326-60c9eb44d5f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_019c9ac0-6d5d-785e-8326-60c9eb44d5f5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_TransactionRelatedCostsRestructuringAndOtherNonOperatingExpenses_019c9ac0-6d5d-74a8-bf1d-3990808bb4e7" xlink:href="apo-20260331.xsd#apo_TransactionRelatedCostsRestructuringAndOtherNonOperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_TransactionRelatedCostsRestructuringAndOtherNonOperatingExpenses_019c9ac0-6d5d-74a8-bf1d-3990808bb4e7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_GainLossOnInvestmentsNetOfOffsets_019c9ac0-6d5d-760f-a3a5-0bc67ba6a93a" xlink:href="apo-20260331.xsd#apo_GainLossOnInvestmentsNetOfOffsets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_GainLossOnInvestmentsNetOfOffsets_019c9ac0-6d5d-760f-a3a5-0bc67ba6a93a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_NonOperatingChangeInInsuranceLiabilitiesAndRelatedDerivativesNetOfOffsets_019c9ac0-6d5d-7172-bf1f-af04e91c8cc9" xlink:href="apo-20260331.xsd#apo_NonOperatingChangeInInsuranceLiabilitiesAndRelatedDerivativesNetOfOffsets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_NonOperatingChangeInInsuranceLiabilitiesAndRelatedDerivativesNetOfOffsets_019c9ac0-6d5d-7172-bf1f-af04e91c8cc9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_IntegrationRestructuringChargesAndOtherNonoperatingExpenses_019c9ac0-6d5d-75ab-ba93-99070e14332d" xlink:href="apo-20260331.xsd#apo_IntegrationRestructuringChargesAndOtherNonoperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_IntegrationRestructuringChargesAndOtherNonoperatingExpenses_019c9ac0-6d5d-75ab-ba93-99070e14332d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PreTaxDistributableEarnings_019c9ac0-6d5d-7654-b78a-ee3b5f1cbb25" xlink:href="apo-20260331.xsd#apo_PreTaxDistributableEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_apo_PreTaxDistributableEarnings_019c9ac0-6d5d-7654-b78a-ee3b5f1cbb25" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashContributionExpense_019c9ac0-6d5d-7428-a1af-3cd5599306b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncashContributionExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c9ac0-6d5d-7558-8505-c086df430da9" xlink:to="loc_us-gaap_NoncashContributionExpense_019c9ac0-6d5d-7428-a1af-3cd5599306b0" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/SegmentsScheduleofReconciliationofSegmentRevenuetoTotalRevenuesDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#SegmentsScheduleofReconciliationofSegmentRevenuetoTotalRevenuesDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/SegmentsScheduleofReconciliationofSegmentRevenuetoTotalRevenuesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-750d-8ac3-fa104ae54a31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-750d-8ac3-fa104ae54a31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74a7-8ac0-5b0d2dd26eae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-750d-8ac3-fa104ae54a31" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74a7-8ac0-5b0d2dd26eae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-74a7-8ac0-5b0d2dd26eae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74a7-8ac0-5b0d2dd26eae" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-74a7-8ac0-5b0d2dd26eae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7714-9726-54ca916fce3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9ac0-6d5d-74a7-8ac0-5b0d2dd26eae" xlink:to="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7714-9726-54ca916fce3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementAndRetirementSegmentsMember_019df8f4-857c-7382-ba80-eb949b0d7993" xlink:href="apo-20260331.xsd#apo_AssetManagementAndRetirementSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9ac0-6d5d-7714-9726-54ca916fce3a" xlink:to="loc_apo_AssetManagementAndRetirementSegmentsMember_019df8f4-857c-7382-ba80-eb949b0d7993" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5d-7a06-837c-ae4aec81e1f3" xlink:href="apo-20260331.xsd#apo_AssetManagementSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_AssetManagementAndRetirementSegmentsMember_019df8f4-857c-7382-ba80-eb949b0d7993" xlink:to="loc_apo_AssetManagementSegmentMember_019c9ac0-6d5d-7a06-837c-ae4aec81e1f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_RetirementServicesSegmentMember_019c9ac0-6d5d-7116-a769-c8a9fbab6a83" xlink:href="apo-20260331.xsd#apo_RetirementServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apo_AssetManagementAndRetirementSegmentsMember_019df8f4-857c-7382-ba80-eb949b0d7993" xlink:to="loc_apo_RetirementServicesSegmentMember_019c9ac0-6d5d-7116-a769-c8a9fbab6a83" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019de3ee-aa80-76c0-b260-6519aeddcdd3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c9ac0-6d5d-750d-8ac3-fa104ae54a31" xlink:to="loc_srt_ConsolidationItemsAxis_019de3ee-aa80-76c0-b260-6519aeddcdd3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019de3ee-aa80-76c0-b260-6519aeddcdd3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019de3ee-aa80-76c0-b260-6519aeddcdd3" xlink:to="loc_srt_ConsolidationItemsDomain_019de3ee-aa80-76c0-b260-6519aeddcdd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019de3ee-aa80-7c36-bc94-eee6e00361fa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019de3ee-aa80-76c0-b260-6519aeddcdd3" xlink:to="loc_srt_ConsolidationItemsDomain_019de3ee-aa80-7c36-bc94-eee6e00361fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019de3ee-c647-7763-8f7c-664d27710060" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019de3ee-aa80-7c36-bc94-eee6e00361fa" xlink:to="loc_us-gaap_OperatingSegmentsMember_019de3ee-c647-7763-8f7c-664d27710060" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c9ac0-6d5d-75df-9e9f-3af54276b591" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_us-gaap_Revenues_019c9ac0-6d5d-75df-9e9f-3af54276b591" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_AdjustmentsRelatedToConsolidatedFundsAndVIEs_019c9ac0-6d5d-78f8-808e-9abb1ac03a28" xlink:href="apo-20260331.xsd#apo_AdjustmentsRelatedToConsolidatedFundsAndVIEs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_AdjustmentsRelatedToConsolidatedFundsAndVIEs_019c9ac0-6d5d-78f8-808e-9abb1ac03a28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_GainLossOnInvestmentsPerformanceAllocation_019c9ac0-6d5d-7f7f-a197-9105c0052f55" xlink:href="apo-20260331.xsd#apo_GainLossOnInvestmentsPerformanceAllocation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_GainLossOnInvestmentsPerformanceAllocation_019c9ac0-6d5d-7f7f-a197-9105c0052f55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrincipalInvestmentGainsLosses_019c9ac0-6d5d-7c5e-9f40-0118d5e05152" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrincipalInvestmentGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_us-gaap_PrincipalInvestmentGainsLosses_019c9ac0-6d5d-7c5e-9f40-0118d5e05152" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_EquityAwardsGrantedByUnconsolidatedRelatedPartiesReimbursableExpensesAndOther_019c9ac0-6d5d-7e4e-9a96-c3c8c1e179e1" xlink:href="apo-20260331.xsd#apo_EquityAwardsGrantedByUnconsolidatedRelatedPartiesReimbursableExpensesAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_EquityAwardsGrantedByUnconsolidatedRelatedPartiesReimbursableExpensesAndOther_019c9ac0-6d5d-7e4e-9a96-c3c8c1e179e1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_PremiumsProductChargesInvestmentRelatedGainsLossesAndOtherRetirementServicesRevenue_019c9ac0-6d5d-7326-9b7a-8ce8fd0ff14f" xlink:href="apo-20260331.xsd#apo_PremiumsProductChargesInvestmentRelatedGainsLossesAndOtherRetirementServicesRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_PremiumsProductChargesInvestmentRelatedGainsLossesAndOtherRetirementServicesRevenue_019c9ac0-6d5d-7326-9b7a-8ce8fd0ff14f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ChangeInFairValueOfReinsuranceAssets_019c9ac0-6d5d-713c-b388-b521452355b1" xlink:href="apo-20260331.xsd#apo_ChangeInFairValueOfReinsuranceAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_ChangeInFairValueOfReinsuranceAssets_019c9ac0-6d5d-713c-b388-b521452355b1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ForwardPointsAdjustmentOnFXDerivativeHedges_019c9ac0-6d5d-76af-a8a2-f043f05888ce" xlink:href="apo-20260331.xsd#apo_ForwardPointsAdjustmentOnFXDerivativeHedges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_ForwardPointsAdjustmentOnFXDerivativeHedges_019c9ac0-6d5d-76af-a8a2-f043f05888ce" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_HeldForTradingAmortization_019c9ac0-6d5d-7b99-9f9d-9f594f8f43a4" xlink:href="apo-20260331.xsd#apo_HeldForTradingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_HeldForTradingAmortization_019c9ac0-6d5d-7b99-9f9d-9f594f8f43a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ReinsuranceImpacts_019c9ac0-6d5d-7868-a501-e974391f64d4" xlink:href="apo-20260331.xsd#apo_ReinsuranceImpacts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_ReinsuranceImpacts_019c9ac0-6d5d-7868-a501-e974391f64d4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_ACRANonControllingInterestsOnNetInvestmentEarnings_019c9ac0-6d5d-79e3-a7e1-f4a71b346dba" xlink:href="apo-20260331.xsd#apo_ACRANonControllingInterestsOnNetInvestmentEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_ACRANonControllingInterestsOnNetInvestmentEarnings_019c9ac0-6d5d-79e3-a7e1-f4a71b346dba" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_OtherRetirementServicesAdjustments_019c9ac0-6d5d-70f5-a7e0-6620dee5ff2c" xlink:href="apo-20260331.xsd#apo_OtherRetirementServicesAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c9ac0-6d5d-7cb8-a2e0-fa07977c8fc6" xlink:to="loc_apo_OtherRetirementServicesAdjustments_019c9ac0-6d5d-70f5-a7e0-6620dee5ff2c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c9ac0-6d5d-7d92-9c20-e69e75adb8b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/SegmentsScheduleofReconciliationofTotalReportableSegmentAssetstoTotalAssetsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#SegmentsScheduleofReconciliationofTotalReportableSegmentAssetstoTotalAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/SegmentsScheduleofReconciliationofTotalReportableSegmentAssetstoTotalAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c9ac0-6d5d-7275-9166-5d1ea5959c57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingRevenueReconcilingItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_019c9ac0-6d5d-7b27-bddb-d5b54c5470a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c9ac0-6d5d-7275-9166-5d1ea5959c57" xlink:to="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_019c9ac0-6d5d-7b27-bddb-d5b54c5470a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7f71-816f-3c649c12edea" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_019c9ac0-6d5d-7b27-bddb-d5b54c5470a1" xlink:to="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7f71-816f-3c649c12edea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7f71-816f-3c649c12edea_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7f71-816f-3c649c12edea" xlink:to="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-7f71-816f-3c649c12edea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-734c-a38f-71af87fba414" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c9ac0-6d5d-7f71-816f-3c649c12edea" xlink:to="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-734c-a38f-71af87fba414" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c9ac0-6d5d-7af8-addf-987e4c60e2a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-734c-a38f-71af87fba414" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c9ac0-6d5d-7af8-addf-987e4c60e2a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019c9ac0-6d5d-7529-a66e-baabaa7462f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c9ac0-6d5d-734c-a38f-71af87fba414" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019c9ac0-6d5d-7529-a66e-baabaa7462f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c9ac0-6d5d-77c2-a8c7-006265ea119d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c9ac0-6d5d-7275-9166-5d1ea5959c57" xlink:to="loc_us-gaap_Assets_019c9ac0-6d5d-77c2-a8c7-006265ea119d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.agm.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="apo-20260331.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.agm.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019c9ac0-6d5d-7342-b8af-60767c9e21bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019c9ac0-6d5d-71a5-b473-9c7db54737b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c9ac0-6d5d-7342-b8af-60767c9e21bf" xlink:to="loc_us-gaap_SubsequentEventTable_019c9ac0-6d5d-71a5-b473-9c7db54737b0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019c9ac0-6d5d-78e7-9e6a-b313db907afb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c9ac0-6d5d-71a5-b473-9c7db54737b0" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019c9ac0-6d5d-78e7-9e6a-b313db907afb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c9ac0-6d5d-78e7-9e6a-b313db907afb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c9ac0-6d5d-78e7-9e6a-b313db907afb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c9ac0-6d5d-78e7-9e6a-b313db907afb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c9ac0-6d5d-70bf-8b7d-2a8bd566482b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c9ac0-6d5d-78e7-9e6a-b313db907afb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c9ac0-6d5d-70bf-8b7d-2a8bd566482b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019c9ac0-6d5d-796e-ad53-c56e2858ff82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019c9ac0-6d5d-70bf-8b7d-2a8bd566482b" xlink:to="loc_us-gaap_SubsequentEventMember_019c9ac0-6d5d-796e-ad53-c56e2858ff82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6d5d-7293-a765-105a5f4fc2da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c9ac0-6d5d-71a5-b473-9c7db54737b0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6d5d-7293-a765-105a5f4fc2da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6d5d-7293-a765-105a5f4fc2da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6d5d-7293-a765-105a5f4fc2da" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6d5d-7293-a765-105a5f4fc2da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c9ac0-6d5d-7eaf-88cc-2742a4d4accf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c9ac0-6d5d-7293-a765-105a5f4fc2da" xlink:to="loc_us-gaap_ClassOfStockDomain_019c9ac0-6d5d-7eaf-88cc-2742a4d4accf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019c9ac0-6d5d-7eaa-a616-8f149d851eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c9ac0-6d5d-7eaf-88cc-2742a4d4accf" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019c9ac0-6d5d-7eaa-a616-8f149d851eb8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019c9ac0-6d5d-7aa9-a014-a460ab8e9788" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c9ac0-6d5d-7342-b8af-60767c9e21bf" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019c9ac0-6d5d-7aa9-a014-a460ab8e9788" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareDeclared_019c9ac0-6d5d-7d15-9658-b6c3266d0967" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c9ac0-6d5d-7342-b8af-60767c9e21bf" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareDeclared_019c9ac0-6d5d-7d15-9658-b6c3266d0967" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_JamesBelardiMember_019d9f31-3a93-70b5-8c05-ba0d4c0c2875" xlink:href="apo-20260331.xsd#apo_JamesBelardiMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_apo_JamesBelardiMember_019d9f31-3a93-70b5-8c05-ba0d4c0c2875" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apo_JohnZitoMember_019d9f31-b85a-7fbf-a3e1-d4904231c847" xlink:href="apo-20260331.xsd#apo_JohnZitoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_apo_JohnZitoMember_019d9f31-b85a-7fbf-a3e1-d4904231c847" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
