﻿<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2019v5.2">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2021-04-29T09:14:32-05:00</ReturnTs>
    <TaxPeriodEndDt>2020-06-30</TaxPeriodEndDt>
    <ReturnTypeCd>990PF</ReturnTypeCd>
    <TaxPeriodBeginDt>2019-07-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>208987808</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>The Philecology Foundation</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>PHIL</BusinessNameControlTxt>
      <PhoneNum>8173908400</PhoneNum>
      <USAddress>
        <AddressLine1Txt>201 Main Street No 2300</AddressLine1Txt>
        <CityNm>Fort Worth</CityNm>
        <StateAbbreviationCd>TX</StateAbbreviationCd>
        <ZIPCd>76102</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Thomas W White</PersonNm>
      <PersonTitleTxt>VICE PRESIDENT</PersonTitleTxt>
      <PhoneNum>8173908400</PhoneNum>
      <SignatureDt>2021-02-03</SignatureDt>
    </BusinessOfficerGrp>
    <TaxYr>2019</TaxYr>
    <BuildTS>2022-09-23 18:48:47Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="8">
    <IRS990PF documentId="RetDoc1235000001">
      <Organization501c3ExemptPFInd>X</Organization501c3ExemptPFInd>
      <FMVAssetsEOYAmt>93134675</FMVAssetsEOYAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AnalysisOfRevenueAndExpenses>
        <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
        <InterestOnSavRevAndExpnssAmt>1899377</InterestOnSavRevAndExpnssAmt>
        <InterestOnSavNetInvstIncmAmt>29468</InterestOnSavNetInvstIncmAmt>
        <DividendsRevAndExpnssAmt>20465</DividendsRevAndExpnssAmt>
        <DividendsNetInvstIncmAmt>20465</DividendsNetInvstIncmAmt>
        <CapGainNetIncmNetInvstIncmAmt>0</CapGainNetIncmNetInvstIncmAmt>
        <OtherIncomeRevAndExpnssAmt referenceDocumentId="RetDoc2001500001">7520412</OtherIncomeRevAndExpnssAmt>
        <OtherIncomeNetInvstIncmAmt>7520412</OtherIncomeNetInvstIncmAmt>
        <OtherIncomeAdjNetIncmAmt>0</OtherIncomeAdjNetIncmAmt>
        <TotalRevAndExpnssAmt>9440254</TotalRevAndExpnssAmt>
        <TotalNetInvstIncmAmt>7570345</TotalNetInvstIncmAmt>
        <TotalAdjNetIncmAmt>0</TotalAdjNetIncmAmt>
        <CompOfcrDirTrstRevAndExpnssAmt>0</CompOfcrDirTrstRevAndExpnssAmt>
        <CompOfcrDirTrstNetInvstIncmAmt>0</CompOfcrDirTrstNetInvstIncmAmt>
        <CompOfcrDirTrstAdjNetIncmAmt>0</CompOfcrDirTrstAdjNetIncmAmt>
        <CompOfcrDirTrstDsbrsChrtblAmt>0</CompOfcrDirTrstDsbrsChrtblAmt>
        <InterestRevAndExpnssAmt>1958422</InterestRevAndExpnssAmt>
        <InterestNetInvstIncmAmt>0</InterestNetInvstIncmAmt>
        <InterestAdjNetIncmAmt>0</InterestAdjNetIncmAmt>
        <InterestDsbrsChrtblAmt>0</InterestDsbrsChrtblAmt>
        <TaxesRevAndExpnssAmt referenceDocumentId="RetDoc2002500001">149650</TaxesRevAndExpnssAmt>
        <TaxesNetInvstIncmAmt>0</TaxesNetInvstIncmAmt>
        <TaxesAdjNetIncmAmt>0</TaxesAdjNetIncmAmt>
        <TaxesDsbrsChrtblAmt>0</TaxesDsbrsChrtblAmt>
        <DeprecAndDpltnRevAndExpnssAmt>15986</DeprecAndDpltnRevAndExpnssAmt>
        <DeprecAndDpltnNetInvstIncmAmt>15986</DeprecAndDpltnNetInvstIncmAmt>
        <DeprecAndDpltnAdjNetIncmAmt>0</DeprecAndDpltnAdjNetIncmAmt>
        <OtherExpensesRevAndExpnssAmt referenceDocumentId="RetDoc2003200001">666734</OtherExpensesRevAndExpnssAmt>
        <OtherExpensesNetInvstIncmAmt>71849</OtherExpensesNetInvstIncmAmt>
        <OtherExpensesAdjNetIncmAmt>0</OtherExpensesAdjNetIncmAmt>
        <OtherExpensesDsbrsChrtblAmt>0</OtherExpensesDsbrsChrtblAmt>
        <TotOprExpensesRevAndExpnssAmt>2790792</TotOprExpensesRevAndExpnssAmt>
        <TotOprExpensesNetInvstIncmAmt>87835</TotOprExpensesNetInvstIncmAmt>
        <TotOprExpensesAdjNetIncmAmt>0</TotOprExpensesAdjNetIncmAmt>
        <TotOprExpensesDsbrsChrtblAmt>0</TotOprExpensesDsbrsChrtblAmt>
        <ContriPaidRevAndExpnssAmt>100000</ContriPaidRevAndExpnssAmt>
        <ContriPaidDsbrsChrtblAmt>100000</ContriPaidDsbrsChrtblAmt>
        <TotalExpensesRevAndExpnssAmt>2890792</TotalExpensesRevAndExpnssAmt>
        <TotalExpensesNetInvstIncmAmt>87835</TotalExpensesNetInvstIncmAmt>
        <TotalExpensesAdjNetIncmAmt>0</TotalExpensesAdjNetIncmAmt>
        <TotalExpensesDsbrsChrtblAmt>100000</TotalExpensesDsbrsChrtblAmt>
        <ExcessRevenueOverExpensesAmt>6549462</ExcessRevenueOverExpensesAmt>
        <NetInvestmentIncomeAmt>7482510</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
      </AnalysisOfRevenueAndExpenses>
      <Form990PFBalanceSheetsGrp>
        <SavAndTempCashInvstBOYAmt>672276</SavAndTempCashInvstBOYAmt>
        <SavAndTempCashInvstEOYAmt>897423</SavAndTempCashInvstEOYAmt>
        <SavAndTempCashInvstEOYFMVAmt>897423</SavAndTempCashInvstEOYFMVAmt>
        <AcctRcvblAmt>1680236</AcctRcvblAmt>
        <AcctRcvblBOYAmt>186605</AcctRcvblBOYAmt>
        <AcctRcvblEOYAmt>1680236</AcctRcvblEOYAmt>
        <AcctRcvblEOYFMVAmt>1680236</AcctRcvblEOYFMVAmt>
        <OtherNtsAndLoansRcvblAmt>70000000</OtherNtsAndLoansRcvblAmt>
        <OtherRcvblAllwncDbtflAcctAmt>0</OtherRcvblAllwncDbtflAcctAmt>
        <OtherNtsAndLoansRcvblBOYAmt>36129928</OtherNtsAndLoansRcvblBOYAmt>
        <OtherNtsAndLoansRcvblEOYAmt>70000000</OtherNtsAndLoansRcvblEOYAmt>
        <OtherNtsAndLoansRcvblEOYFMVAmt>70000000</OtherNtsAndLoansRcvblEOYFMVAmt>
        <CorporateStockBOYAmt>734864</CorporateStockBOYAmt>
        <CorporateStockEOYAmt referenceDocumentId="RetDoc2018900001">734864</CorporateStockEOYAmt>
        <CorporateStockEOYFMVAmt>1293070</CorporateStockEOYFMVAmt>
        <OtherAssetsBOYAmt referenceDocumentId="RetDoc2046600001">319289</OtherAssetsBOYAmt>
        <OtherAssetsEOYAmt referenceDocumentId="RetDoc2046600001">767351</OtherAssetsEOYAmt>
        <OtherAssetsEOYFMVAmt referenceDocumentId="RetDoc2046600001">19263946</OtherAssetsEOYFMVAmt>
        <TotalAssetsBOYAmt>38042962</TotalAssetsBOYAmt>
        <TotalAssetsEOYAmt>74079874</TotalAssetsEOYAmt>
        <TotalAssetsEOYFMVAmt>93134675</TotalAssetsEOYFMVAmt>
        <MortgagesAndNotesPayableBOYAmt>34846842</MortgagesAndNotesPayableBOYAmt>
        <MortgagesAndNotesPayableEOYAmt>64328972</MortgagesAndNotesPayableEOYAmt>
        <OtherLiabilitiesBOYAmt referenceDocumentId="RetDoc2065700001">0</OtherLiabilitiesBOYAmt>
        <OtherLiabilitiesEOYAmt referenceDocumentId="RetDoc2065700001">33137</OtherLiabilitiesEOYAmt>
        <TotalLiabilitiesBOYAmt>34846842</TotalLiabilitiesBOYAmt>
        <TotalLiabilitiesEOYAmt>64362109</TotalLiabilitiesEOYAmt>
        <OrgDoesNotFollowFASB117Ind>X</OrgDoesNotFollowFASB117Ind>
        <CapitalStockBOYAmt>0</CapitalStockBOYAmt>
        <CapitalStockEOYAmt>0</CapitalStockEOYAmt>
        <AdditionalPaidInCapitalBOYAmt>0</AdditionalPaidInCapitalBOYAmt>
        <AdditionalPaidInCapitalEOYAmt>0</AdditionalPaidInCapitalEOYAmt>
        <RetainedEarningBOYAmt>3196120</RetainedEarningBOYAmt>
        <RetainedEarningEOYAmt>9717765</RetainedEarningEOYAmt>
        <TotNetAstOrFundBalancesBOYAmt>3196120</TotNetAstOrFundBalancesBOYAmt>
        <TotNetAstOrFundBalancesEOYAmt>9717765</TotNetAstOrFundBalancesEOYAmt>
        <TotalLiabilitiesNetAstBOYAmt>38042962</TotalLiabilitiesNetAstBOYAmt>
        <TotalLiabilitiesNetAstEOYAmt>74079874</TotalLiabilitiesNetAstEOYAmt>
      </Form990PFBalanceSheetsGrp>
      <ChgInNetAssetsFundBalancesGrp>
        <TotNetAstOrFundBalancesBOYAmt>3196120</TotNetAstOrFundBalancesBOYAmt>
        <ExcessRevenueOverExpensesAmt>6549462</ExcessRevenueOverExpensesAmt>
        <OtherIncreasesAmt>0</OtherIncreasesAmt>
        <SubtotalAmt>9745582</SubtotalAmt>
        <OtherDecreasesAmt referenceDocumentId="RetDoc2049800001">27817</OtherDecreasesAmt>
        <TotNetAstOrFundBalancesEOYAmt>9717765</TotNetAstOrFundBalancesEOYAmt>
      </ChgInNetAssetsFundBalancesGrp>
      <QlfyUndSect4940eReducedTaxGrp>
        <LiableSection4942TaxInd>0</LiableSection4942TaxInd>
        <AdjustedQlfyDistriYr1Amt>1241312</AdjustedQlfyDistriYr1Amt>
        <NetVlNoncharitableAssetsYr1Amt>22935130</NetVlNoncharitableAssetsYr1Amt>
        <DistributionYr1Rt>0.054123</DistributionYr1Rt>
        <AdjustedQlfyDistriYr2Amt>1404500</AdjustedQlfyDistriYr2Amt>
        <NetVlNoncharitableAssetsYr2Amt>4764370</NetVlNoncharitableAssetsYr2Amt>
        <DistributionYr2Rt>0.294792</DistributionYr2Rt>
        <AdjustedQlfyDistriYr3Amt>16490833</AdjustedQlfyDistriYr3Amt>
        <NetVlNoncharitableAssetsYr3Amt>35787083</NetVlNoncharitableAssetsYr3Amt>
        <DistributionYr3Rt>0.460804</DistributionYr3Rt>
        <AdjustedQlfyDistriYr4Amt>13720408</AdjustedQlfyDistriYr4Amt>
        <NetVlNoncharitableAssetsYr4Amt>41003536</NetVlNoncharitableAssetsYr4Amt>
        <DistributionYr4Rt>0.334615</DistributionYr4Rt>
        <AdjustedQlfyDistriYr5Amt>15010633</AdjustedQlfyDistriYr5Amt>
        <NetVlNoncharitableAssetsYr5Amt>50991445</NetVlNoncharitableAssetsYr5Amt>
        <DistributionYr5Rt>0.294376</DistributionYr5Rt>
        <TotalDistributionRt>1.438710</TotalDistributionRt>
        <AverageDistributionRt>0.287742</AverageDistributionRt>
        <NetVlNoncharitableAssetsAmt>29275920</NetVlNoncharitableAssetsAmt>
        <AdjNetVlNoncharitableAssetsAmt>8423912</AdjNetVlNoncharitableAssetsAmt>
        <NetInvestmentIncomePctAmt>74825</NetInvestmentIncomePctAmt>
        <AdjNonchrtblNetInvstIncmPctAmt>8498737</AdjNonchrtblNetInvstIncmPctAmt>
        <QualifyingDistributionsAmt>100000</QualifyingDistributionsAmt>
      </QlfyUndSect4940eReducedTaxGrp>
      <ExciseTaxBasedOnInvstIncmGrp>
        <InvestmentIncomeExciseTaxAmt>149650</InvestmentIncomeExciseTaxAmt>
        <TaxUnderSection511Amt>0</TaxUnderSection511Amt>
        <SubtotalAmt>149650</SubtotalAmt>
        <SubtitleATaxAmt>0</SubtitleATaxAmt>
        <TaxBasedOnInvestmentIncomeAmt>149650</TaxBasedOnInvestmentIncomeAmt>
        <EstimatedPlusOvpmtIncmTxAmt>159512</EstimatedPlusOvpmtIncmTxAmt>
        <ExtsnRequestIncomeTaxPaidAmt>2500</ExtsnRequestIncomeTaxPaidAmt>
        <BackupWithholdingWithheldAmt>0</BackupWithholdingWithheldAmt>
        <TotalPaymentsAndCreditsAmt>162012</TotalPaymentsAndCreditsAmt>
        <Form2220AttachedInd referenceDocumentId="RetDoc1192000001">X</Form2220AttachedInd>
        <EsPenaltyAmt>0</EsPenaltyAmt>
        <OverpaymentAmt>12362</OverpaymentAmt>
        <AppliedToESTaxAmt>12362</AppliedToESTaxAmt>
        <RefundAmt>0</RefundAmt>
      </ExciseTaxBasedOnInvstIncmGrp>
      <StatementsRegardingActyGrp>
        <LegislativePoliticalActyInd>0</LegislativePoliticalActyInd>
        <MoreThan100SpentInd>0</MoreThan100SpentInd>
        <Form1120POLFiledInd>0</Form1120POLFiledInd>
        <Section4955OrganizationTaxAmt>0</Section4955OrganizationTaxAmt>
        <Section4955ManagersTaxAmt>0</Section4955ManagersTaxAmt>
        <TaxReimbursedAmt>0</TaxReimbursedAmt>
        <ActivitiesNotPreviouslyRptInd>0</ActivitiesNotPreviouslyRptInd>
        <ChangesToArticlesOrBylawsInd>0</ChangesToArticlesOrBylawsInd>
        <UnrelatedBusIncmOverLimitInd>1</UnrelatedBusIncmOverLimitInd>
        <Form990TFiledInd>1</Form990TFiledInd>
        <OrganizationDissolvedEtcInd>0</OrganizationDissolvedEtcInd>
        <Section508eRqrSatisfiedInd>0</Section508eRqrSatisfiedInd>
        <AtLeast5000InAssetsInd>1</AtLeast5000InAssetsInd>
        <OrgReportOrRegisterStateCd>TX</OrgReportOrRegisterStateCd>
        <Form990PFFiledWithAttyGenInd>1</Form990PFFiledWithAttyGenInd>
        <PrivateOperatingFoundationInd>0</PrivateOperatingFoundationInd>
        <NewSubstantialContributorsInd>0</NewSubstantialContributorsInd>
        <OwnControlledEntityInd>0</OwnControlledEntityInd>
        <DonorAdvisedFundInd>0</DonorAdvisedFundInd>
        <ComplyWithPublicInspRqrInd>1</ComplyWithPublicInspRqrInd>
        <WebsiteAddressTxt>N/A</WebsiteAddressTxt>
        <IndividualWithBooksNm>Thomas W White</IndividualWithBooksNm>
        <PhoneNum>8173908400</PhoneNum>
        <LocationOfBooksUSAddress>
          <AddressLine1Txt>201 Main Street Suite 2600</AddressLine1Txt>
          <CityNm>Fort Worth</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>76102</ZIPCd>
        </LocationOfBooksUSAddress>
        <ForeignAccountsQuestionInd>0</ForeignAccountsQuestionInd>
      </StatementsRegardingActyGrp>
      <StatementsRegardingActy4720Grp>
        <SaleOrExchDisqualifiedPrsnInd>0</SaleOrExchDisqualifiedPrsnInd>
        <BrrwOrLendDisqualifiedPrsnInd>0</BrrwOrLendDisqualifiedPrsnInd>
        <FurnGoodsDisqualifiedPrsnInd>0</FurnGoodsDisqualifiedPrsnInd>
        <PayCompDisqualifiedPrsnInd>0</PayCompDisqualifiedPrsnInd>
        <TransferAstDisqualifiedPrsnInd>0</TransferAstDisqualifiedPrsnInd>
        <PaymentToGovernmentOfficialInd>0</PaymentToGovernmentOfficialInd>
        <UncorrectedPriorActsInd>0</UncorrectedPriorActsInd>
        <UndistributedIncomePYInd>0</UndistributedIncomePYInd>
        <BusinessHoldingsInd>0</BusinessHoldingsInd>
        <JeopardyInvestmentsInd>0</JeopardyInvestmentsInd>
        <UncorrectedPYJeopardyInvstInd>0</UncorrectedPYJeopardyInvstInd>
        <InfluenceLegislationInd>0</InfluenceLegislationInd>
        <InfluenceElectionInd>0</InfluenceElectionInd>
        <GrantsToIndividualsInd>0</GrantsToIndividualsInd>
        <GrantsToOrganizationsInd>0</GrantsToOrganizationsInd>
        <NoncharitablePurposeInd>0</NoncharitablePurposeInd>
        <RcvFndsToPayPrsnlBnftCntrctInd>0</RcvFndsToPayPrsnlBnftCntrctInd>
        <PayPremiumsPrsnlBnftCntrctInd>0</PayPremiumsPrsnlBnftCntrctInd>
        <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
        <SubjToTaxRmnrtnExPrchtPymtInd>0</SubjToTaxRmnrtnExPrchtPymtInd>
      </StatementsRegardingActy4720Grp>
      <OfficerDirTrstKeyEmplInfoGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>Edward P Bass</PersonNm>
          <USAddress>
            <AddressLine1Txt>201 Main Street Suite 2300</AddressLine1Txt>
            <CityNm>Fort Worth</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>76102</ZIPCd>
          </USAddress>
          <TitleTxt>President, Director</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>Gary W Reese</PersonNm>
          <USAddress>
            <AddressLine1Txt>201 Main Street Suite 2300</AddressLine1Txt>
            <CityNm>Fort Worth</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>76102</ZIPCd>
          </USAddress>
          <TitleTxt>VP, Asst Treas</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>Thomas W White</PersonNm>
          <USAddress>
            <AddressLine1Txt>201 Main Street Suite 2300</AddressLine1Txt>
            <CityNm>Fort Worth</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>76102</ZIPCd>
          </USAddress>
          <TitleTxt>VP, Treas, Asst Sec, Direc</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>Dee Steer</PersonNm>
          <USAddress>
            <AddressLine1Txt>201 Main Street Suite 2300</AddressLine1Txt>
            <CityNm>Fort Worth</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>76102</ZIPCd>
          </USAddress>
          <TitleTxt>Secretary, Director</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>Tony S Lee</PersonNm>
          <USAddress>
            <AddressLine1Txt>201 Main Street Suite 2300</AddressLine1Txt>
            <CityNm>fort Worth</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>76102</ZIPCd>
          </USAddress>
          <TitleTxt>VP</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.50</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <CompOfHghstPdEmplOrNONETxt>NONE</CompOfHghstPdEmplOrNONETxt>
        <OtherEmployeePaidOver50kCnt>0</OtherEmployeePaidOver50kCnt>
        <CompOfHghstPdCntrctOrNONETxt>NONE</CompOfHghstPdCntrctOrNONETxt>
        <ContractorPaidOver50kCnt>0</ContractorPaidOver50kCnt>
      </OfficerDirTrstKeyEmplInfoGrp>
      <SumOfProgramRelatedInvstGrp>
        <TotalAmt>0</TotalAmt>
      </SumOfProgramRelatedInvstGrp>
      <MinimumInvestmentReturnGrp>
        <AverageMonthlyFMVOfSecAmt>1488448</AverageMonthlyFMVOfSecAmt>
        <AverageMonthlyCashBalancesAmt>343990</AverageMonthlyCashBalancesAmt>
        <FMVAllOtherNoncharitableAstAmt>90944182</FMVAllOtherNoncharitableAstAmt>
        <TotalFMVOfUnusedAssetsAmt>92776620</TotalFMVOfUnusedAssetsAmt>
        <ReductionClaimedAmt>0</ReductionClaimedAmt>
        <AcquisitionIndebtednessAmt>63054874</AcquisitionIndebtednessAmt>
        <AdjustedTotalFMVOfUnusedAstAmt>29721746</AdjustedTotalFMVOfUnusedAstAmt>
        <CashDeemedCharitableAmt>445826</CashDeemedCharitableAmt>
        <NetVlNoncharitableAssetsAmt>29275920</NetVlNoncharitableAssetsAmt>
        <MinimumInvestmentReturnAmt>1463796</MinimumInvestmentReturnAmt>
      </MinimumInvestmentReturnGrp>
      <DistributableAmountGrp>
        <MinimumInvestmentReturnAmt>1463796</MinimumInvestmentReturnAmt>
        <TaxBasedOnInvestmentIncomeAmt>149650</TaxBasedOnInvestmentIncomeAmt>
        <TotalTaxAmt>149650</TotalTaxAmt>
        <DistributableBeforeAdjAmt>1314146</DistributableBeforeAdjAmt>
        <RecoveriesQualfiedDistriAmt>0</RecoveriesQualfiedDistriAmt>
        <DistributableBeforeDedAmt>1314146</DistributableBeforeDedAmt>
        <DeductionFromDistributableAmt>0</DeductionFromDistributableAmt>
        <DistributableAsAdjustedAmt>1314146</DistributableAsAdjustedAmt>
      </DistributableAmountGrp>
      <QualifyingDistriPartXIIGrp>
        <ExpensesAndContributionsAmt>100000</ExpensesAndContributionsAmt>
        <ProgramRelatedInvstTotalAmt>0</ProgramRelatedInvstTotalAmt>
        <QualifyingDistributionsAmt>100000</QualifyingDistributionsAmt>
        <PctSect4940eOrgNetInvstIncmAmt>0</PctSect4940eOrgNetInvstIncmAmt>
        <AdjustedQualifyingDistriAmt>100000</AdjustedQualifyingDistriAmt>
      </QualifyingDistriPartXIIGrp>
      <UndistributedIncomeGrp>
        <DistributableAsAdjustedAmt>1314146</DistributableAsAdjustedAmt>
        <UndistributedIncomePYAmt>0</UndistributedIncomePYAmt>
        <TotalForPriorYearsAmt>0</TotalForPriorYearsAmt>
        <ExcessDistributionCyovYr5Amt>12458397</ExcessDistributionCyovYr5Amt>
        <ExcessDistributionCyovYr4Amt>11783919</ExcessDistributionCyovYr4Amt>
        <ExcessDistributionCyovYr3Amt>14524137</ExcessDistributionCyovYr3Amt>
        <ExcessDistributionCyovYr2Amt>13519465</ExcessDistributionCyovYr2Amt>
        <ExcessDistributionCyovYr1Amt>118387</ExcessDistributionCyovYr1Amt>
        <TotalExcessDistributionCyovAmt>52404305</TotalExcessDistributionCyovAmt>
        <QualifyingDistributionsAmt>100000</QualifyingDistributionsAmt>
        <AppliedToYear1Amt>0</AppliedToYear1Amt>
        <AppliedToPriorYearsAmt>0</AppliedToPriorYearsAmt>
        <TreatedAsDistriFromCorpusAmt>0</TreatedAsDistriFromCorpusAmt>
        <AppliedToCurrentYearAmt>100000</AppliedToCurrentYearAmt>
        <RemainingDistriFromCorpusAmt>0</RemainingDistriFromCorpusAmt>
        <ExcessDistriCyovAppCYCorpusAmt>1214146</ExcessDistriCyovAppCYCorpusAmt>
        <ExcessDistributionCyovAppCYAmt>1214146</ExcessDistributionCyovAppCYAmt>
        <TotalCorpusAmt>51190159</TotalCorpusAmt>
        <PriorYearUndistributedIncmAmt>0</PriorYearUndistributedIncmAmt>
        <PriorYearDeficiencyOrTaxAmt>0</PriorYearDeficiencyOrTaxAmt>
        <Taxable1Amt>0</Taxable1Amt>
        <Taxable2Amt>0</Taxable2Amt>
        <UndistributedIncomeCYAmt>0</UndistributedIncomeCYAmt>
        <CorpusDistri170b1EOr4942g3Amt>0</CorpusDistri170b1EOr4942g3Amt>
        <ExcessDistriCyovFromYr5Amt>11244251</ExcessDistriCyovFromYr5Amt>
        <ExcessDistriCyovToNextYrAmt>39945908</ExcessDistriCyovToNextYrAmt>
        <ExcessFromYear4Amt>11783919</ExcessFromYear4Amt>
        <ExcessFromYear3Amt>14524137</ExcessFromYear3Amt>
        <ExcessFromYear2Amt>13519465</ExcessFromYear2Amt>
        <ExcessFromYear1Amt>118387</ExcessFromYear1Amt>
      </UndistributedIncomeGrp>
      <SupplementaryInformationGrp>
        <ContributingManagerNm>Edward P Bass</ContributingManagerNm>
        <OnlyContriToPreselectedInd>X</OnlyContriToPreselectedInd>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>Amazon Conservation Association</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>1012 14th Street NW Suite 625</AddressLine1Txt>
            <CityNm>Washington</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20005</ZIPCd>
          </RecipientUSAddress>
          <RecipientFoundationStatusTxt>Tax Exempt</RecipientFoundationStatusTxt>
          <GrantOrContributionPurposeTxt>Conservation Organization</GrantOrContributionPurposeTxt>
          <Amt>100000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <TotalGrantOrContriPdDurYrAmt>100000</TotalGrantOrContriPdDurYrAmt>
        <TotalGrantOrContriApprvFutAmt>0</TotalGrantOrContriApprvFutAmt>
      </SupplementaryInformationGrp>
      <AnalysisIncomeProducingActyGrp>
        <IntOnSavAndTempCashInvstGrp>
          <BusinessCd>525990</BusinessCd>
          <UnrelatedBusinessTaxblIncmAmt>1869909</UnrelatedBusinessTaxblIncmAmt>
          <ExclusionCd>14</ExclusionCd>
          <ExclusionAmt>29468</ExclusionAmt>
        </IntOnSavAndTempCashInvstGrp>
        <DivAndIntFromSecPartVIIGrp>
          <ExclusionCd>14</ExclusionCd>
          <ExclusionAmt>20465</ExclusionAmt>
        </DivAndIntFromSecPartVIIGrp>
        <OtherInvestmentIncmPartVIIGrp>
          <ExclusionCd>15</ExclusionCd>
          <ExclusionAmt>7520412</ExclusionAmt>
        </OtherInvestmentIncmPartVIIGrp>
        <SubtotalsIncmProducingActyGrp>
          <UnrelatedBusinessTaxblIncmAmt>1869909</UnrelatedBusinessTaxblIncmAmt>
          <ExclusionAmt>7570345</ExclusionAmt>
          <RelatedOrExemptFunctionIncmAmt>0</RelatedOrExemptFunctionIncmAmt>
        </SubtotalsIncmProducingActyGrp>
        <TotalIncomeProducingActyAmt>9440254</TotalIncomeProducingActyAmt>
      </AnalysisIncomeProducingActyGrp>
      <TrnsfrTransRlnNonchrtblEOGrp>
        <TrnsfrOfCashToNonchrtblEOInd>0</TrnsfrOfCashToNonchrtblEOInd>
        <TrnsfrOtherAssetNonchrtblEOInd>0</TrnsfrOtherAssetNonchrtblEOInd>
        <SalesOrExchangesOfAssetsInd>0</SalesOrExchangesOfAssetsInd>
        <PurchaseOfAssetsNonchrtblEOInd>0</PurchaseOfAssetsNonchrtblEOInd>
        <RentalOfFacilitiesOthAssetsInd>0</RentalOfFacilitiesOthAssetsInd>
        <ReimbursementArrangementsInd>0</ReimbursementArrangementsInd>
        <LoansOrLoanGuaranteesInd>0</LoansOrLoanGuaranteesInd>
        <PerformanceOfServicesEtcInd>0</PerformanceOfServicesEtcInd>
        <SharingOfFacilitiesEtcInd>0</SharingOfFacilitiesEtcInd>
        <RelationshipsNonchrtblEOInd>0</RelationshipsNonchrtblEOInd>
      </TrnsfrTransRlnNonchrtblEOGrp>
    </IRS990PF>
    <InvestmentsCorpStockSchedule documentId="RetDoc2018900001">
      <InvestmentsCorporateStockGrp>
        <StockNm>Investments in Stock</StockNm>
        <EOYBookValueAmt>734864</EOYBookValueAmt>
        <EOYFMVAmt>1293070</EOYFMVAmt>
      </InvestmentsCorporateStockGrp>
    </InvestmentsCorpStockSchedule>
    <OtherAssetsSchedule documentId="RetDoc2046600001">
      <OtherAssetsScheduleGrp>
        <Desc>Deferred Financing Costs</Desc>
        <BOYBookValueAmt>43384</BOYBookValueAmt>
        <EOYBookValueAmt>27115</EOYBookValueAmt>
        <EOYFMVAmt>27115</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
      <OtherAssetsScheduleGrp>
        <Desc>Federal Income Tax Payable</Desc>
        <BOYBookValueAmt>30344</BOYBookValueAmt>
        <EOYBookValueAmt>0</EOYBookValueAmt>
        <EOYFMVAmt>0</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
      <OtherAssetsScheduleGrp>
        <Desc>Leasehold - A/D</Desc>
        <BOYBookValueAmt>-835738</BOYBookValueAmt>
        <EOYBookValueAmt>-877419</EOYBookValueAmt>
        <EOYFMVAmt>-877419</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
      <OtherAssetsScheduleGrp>
        <Desc>Leasehold Cost- Depletable Assets</Desc>
        <BOYBookValueAmt>1055513</BOYBookValueAmt>
        <EOYBookValueAmt>1591892</EOYBookValueAmt>
        <EOYFMVAmt>1591892</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
      <OtherAssetsScheduleGrp>
        <Desc>NON PRODUCING ROYALTY</Desc>
        <BOYBookValueAmt>0</BOYBookValueAmt>
        <EOYBookValueAmt>0</EOYBookValueAmt>
        <EOYFMVAmt>18496595</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
      <OtherAssetsScheduleGrp>
        <Desc>Non-producing Lease Cost</Desc>
        <BOYBookValueAmt>25786</BOYBookValueAmt>
        <EOYBookValueAmt>25763</EOYBookValueAmt>
        <EOYFMVAmt>25763</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
    </OtherAssetsSchedule>
    <OtherDecreasesSchedule documentId="RetDoc2049800001">
      <OtherDecreasesDetail>
        <Desc>Non-Deductible Expenses</Desc>
        <Amt>3985</Amt>
      </OtherDecreasesDetail>
      <OtherDecreasesDetail>
        <Desc>Prior Year Excise Tax Adjustments</Desc>
        <Amt>23832</Amt>
      </OtherDecreasesDetail>
    </OtherDecreasesSchedule>
    <OtherExpensesSchedule documentId="RetDoc2003200001">
      <OtherExpensesScheduleGrp>
        <Desc>Bank Fees</Desc>
        <RevenueAndExpensesPerBooksAmt>55580</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>55580</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>Amortization Expense</Desc>
        <RevenueAndExpensesPerBooksAmt>16269</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>16269</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>Forgiven Interest Expense</Desc>
        <RevenueAndExpensesPerBooksAmt>594885</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
    </OtherExpensesSchedule>
    <OtherIncomeSchedule2 documentId="RetDoc2001500001">
      <OtherIncomeDetail>
        <Desc>OTHER INCOME</Desc>
        <RevenueAndExpensesPerBooksAmt>449</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>449</NetInvestmentIncomeAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>Royalty income</Desc>
        <RevenueAndExpensesPerBooksAmt>7519963</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>7519963</NetInvestmentIncomeAmt>
      </OtherIncomeDetail>
    </OtherIncomeSchedule2>
    <OtherLiabilitiesSchedule documentId="RetDoc2065700001">
      <OtherLiabilitiesDetail>
        <Desc>EXCISE TAX</Desc>
        <BOYBookValueAmt>0</BOYBookValueAmt>
        <EOYBookValueAmt>33137</EOYBookValueAmt>
      </OtherLiabilitiesDetail>
    </OtherLiabilitiesSchedule>
    <TaxesSchedule documentId="RetDoc2002500001">
      <TaxesDetail>
        <CategoryTxt>EXCISE TAX</CategoryTxt>
        <Amt>149650</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </TaxesDetail>
    </TaxesSchedule>
  </ReturnData>
</Return>