<?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="2021v4.2">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2022-11-15T10:05:51-06:00</ReturnTs>
    <TaxPeriodEndDt>2021-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>042387531</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>SULLIVAN &amp; WORCESTER</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>ONE POST OFFICE SQUARE</AddressLine1Txt>
        <CityNm>BOSTON</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>02109</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990PF</ReturnTypeCd>
    <TaxPeriodBeginDt>2021-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>043528004</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>POPPLESTONE FOUNDATION</BusinessNameLine1Txt>
        <BusinessNameLine2Txt>C/O SULLIVAN &amp; WORCESTER LLP</BusinessNameLine2Txt>
      </BusinessName>
      <BusinessNameControlTxt>POPP</BusinessNameControlTxt>
      <PhoneNum>6173382839</PhoneNum>
      <USAddress>
        <AddressLine1Txt>ONE POST OFFICE SQUARE</AddressLine1Txt>
        <CityNm>BOSTON</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>02109</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>SUZANNE E WERBER DWORSKY</PersonNm>
      <PersonTitleTxt>TRUSTEE</PersonTitleTxt>
      <PhoneNum>6173382839</PhoneNum>
      <SignatureDt>2022-11-15</SignatureDt>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>SUZANNE</PersonFirstNm>
        <PersonLastNm>WERBER DWORSKY</PersonLastNm>
      </PersonFullName>
      <SSN>999009999</SSN>
    </SigningOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>CHRISTOPHER C CURTIS</PreparerPersonNm>
      <PTIN>P00492268</PTIN>
      <PhoneNum>6173382800</PhoneNum>
      <SelfEmployedInd>X</SelfEmployedInd>
    </PreparerPersonGrp>
    <AdditionalFilerInformation>
      <TrustedCustomerGrp>
        <TrustedCustomerCd>3</TrustedCustomerCd>
        <AuthenticationAssuranceLevelCd>AAL1</AuthenticationAssuranceLevelCd>
        <IdentityAssuranceLevelCd>IAL1</IdentityAssuranceLevelCd>
      </TrustedCustomerGrp>
    </AdditionalFilerInformation>
    <TaxYr>2021</TaxYr>
    <BuildTS>2022-09-23 18:48:47Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="11">
    <IRS990PF documentId="RetDoc1235000001" referenceDocumentId="RetDoc2258700001">
      <Organization501c3ExemptPFInd>X</Organization501c3ExemptPFInd>
      <FMVAssetsEOYAmt>35512299</FMVAssetsEOYAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AnalysisOfRevenueAndExpenses>
        <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
        <DividendsRevAndExpnssAmt>575834</DividendsRevAndExpnssAmt>
        <DividendsNetInvstIncmAmt>575834</DividendsNetInvstIncmAmt>
        <NetGainSaleAstRevAndExpnssAmt>4943</NetGainSaleAstRevAndExpnssAmt>
        <GrossSalesPriceAmt>3003571</GrossSalesPriceAmt>
        <CapGainNetIncmNetInvstIncmAmt>4943</CapGainNetIncmNetInvstIncmAmt>
        <OtherIncomeRevAndExpnssAmt referenceDocumentId="RetDoc2001500001">25744</OtherIncomeRevAndExpnssAmt>
        <OtherIncomeNetInvstIncmAmt>0</OtherIncomeNetInvstIncmAmt>
        <TotalRevAndExpnssAmt>606521</TotalRevAndExpnssAmt>
        <TotalNetInvstIncmAmt>580777</TotalNetInvstIncmAmt>
        <CompOfcrDirTrstRevAndExpnssAmt>0</CompOfcrDirTrstRevAndExpnssAmt>
        <CompOfcrDirTrstNetInvstIncmAmt>0</CompOfcrDirTrstNetInvstIncmAmt>
        <CompOfcrDirTrstDsbrsChrtblAmt>0</CompOfcrDirTrstDsbrsChrtblAmt>
        <LegalFeesRevAndExpnssAmt referenceDocumentId="RetDoc2002100001">26187</LegalFeesRevAndExpnssAmt>
        <LegalFeesNetInvstIncmAmt>0</LegalFeesNetInvstIncmAmt>
        <LegalFeesDsbrsChrtblAmt>26187</LegalFeesDsbrsChrtblAmt>
        <TaxesRevAndExpnssAmt referenceDocumentId="RetDoc2002500001">87100</TaxesRevAndExpnssAmt>
        <TaxesNetInvstIncmAmt>0</TaxesNetInvstIncmAmt>
        <TaxesDsbrsChrtblAmt>0</TaxesDsbrsChrtblAmt>
        <OtherExpensesRevAndExpnssAmt referenceDocumentId="RetDoc2003200001">47773</OtherExpensesRevAndExpnssAmt>
        <OtherExpensesNetInvstIncmAmt>15753</OtherExpensesNetInvstIncmAmt>
        <OtherExpensesDsbrsChrtblAmt>250</OtherExpensesDsbrsChrtblAmt>
        <TotOprExpensesRevAndExpnssAmt>161060</TotOprExpensesRevAndExpnssAmt>
        <TotOprExpensesNetInvstIncmAmt>15753</TotOprExpensesNetInvstIncmAmt>
        <TotOprExpensesDsbrsChrtblAmt>26437</TotOprExpensesDsbrsChrtblAmt>
        <ContriPaidRevAndExpnssAmt>5763299</ContriPaidRevAndExpnssAmt>
        <ContriPaidDsbrsChrtblAmt>5763299</ContriPaidDsbrsChrtblAmt>
        <TotalExpensesRevAndExpnssAmt>5924359</TotalExpensesRevAndExpnssAmt>
        <TotalExpensesNetInvstIncmAmt>15753</TotalExpensesNetInvstIncmAmt>
        <TotalExpensesDsbrsChrtblAmt>5789736</TotalExpensesDsbrsChrtblAmt>
        <ExcessRevenueOverExpensesAmt>-5317838</ExcessRevenueOverExpensesAmt>
        <NetInvestmentIncomeAmt>565024</NetInvestmentIncomeAmt>
      </AnalysisOfRevenueAndExpenses>
      <Form990PFBalanceSheetsGrp>
        <SavAndTempCashInvstBOYAmt>259382</SavAndTempCashInvstBOYAmt>
        <SavAndTempCashInvstEOYAmt>993213</SavAndTempCashInvstEOYAmt>
        <SavAndTempCashInvstEOYFMVAmt>993213</SavAndTempCashInvstEOYFMVAmt>
        <USGovernmentObligationsBOYAmt>14951024</USGovernmentObligationsBOYAmt>
        <USGovernmentObligationsEOYAmt referenceDocumentId="RetDoc2210400001">8958211</USGovernmentObligationsEOYAmt>
        <USGovtObligationsEOYFMVAmt>8796250</USGovtObligationsEOYFMVAmt>
        <CorporateStockBOYAmt>9277073</CorporateStockBOYAmt>
        <CorporateStockEOYAmt referenceDocumentId="RetDoc2018900001">9277073</CorporateStockEOYAmt>
        <CorporateStockEOYFMVAmt>24681397</CorporateStockEOYFMVAmt>
        <OtherInvestmentsBOYAmt>1047465</OtherInvestmentsBOYAmt>
        <OtherInvestmentsEOYAmt referenceDocumentId="RetDoc2018100001">1041439</OtherInvestmentsEOYAmt>
        <OtherInvestmentsEOYFMVAmt>1041439</OtherInvestmentsEOYFMVAmt>
        <OtherAssetsBOYAmt referenceDocumentId="RetDoc2046600001">52832</OtherAssetsBOYAmt>
        <OtherAssetsEOYAmt referenceDocumentId="RetDoc2046600001">0</OtherAssetsEOYAmt>
        <OtherAssetsEOYFMVAmt referenceDocumentId="RetDoc2046600001">0</OtherAssetsEOYFMVAmt>
        <TotalAssetsBOYAmt>25587776</TotalAssetsBOYAmt>
        <TotalAssetsEOYAmt>20269936</TotalAssetsEOYAmt>
        <TotalAssetsEOYFMVAmt>35512299</TotalAssetsEOYFMVAmt>
        <TotalLiabilitiesBOYAmt>0</TotalLiabilitiesBOYAmt>
        <TotalLiabilitiesEOYAmt>0</TotalLiabilitiesEOYAmt>
        <OrgDoesNotFollowFASB117Ind>X</OrgDoesNotFollowFASB117Ind>
        <CapitalStockBOYAmt>0</CapitalStockBOYAmt>
        <CapitalStockEOYAmt>0</CapitalStockEOYAmt>
        <AdditionalPaidInCapitalBOYAmt>0</AdditionalPaidInCapitalBOYAmt>
        <AdditionalPaidInCapitalEOYAmt>0</AdditionalPaidInCapitalEOYAmt>
        <RetainedEarningBOYAmt>25587776</RetainedEarningBOYAmt>
        <RetainedEarningEOYAmt>20269936</RetainedEarningEOYAmt>
        <TotNetAstOrFundBalancesBOYAmt>25587776</TotNetAstOrFundBalancesBOYAmt>
        <TotNetAstOrFundBalancesEOYAmt>20269936</TotNetAstOrFundBalancesEOYAmt>
        <TotalLiabilitiesNetAstBOYAmt>25587776</TotalLiabilitiesNetAstBOYAmt>
        <TotalLiabilitiesNetAstEOYAmt>20269936</TotalLiabilitiesNetAstEOYAmt>
      </Form990PFBalanceSheetsGrp>
      <ChgInNetAssetsFundBalancesGrp>
        <TotNetAstOrFundBalancesBOYAmt>25587776</TotNetAstOrFundBalancesBOYAmt>
        <ExcessRevenueOverExpensesAmt>-5317838</ExcessRevenueOverExpensesAmt>
        <OtherIncreasesAmt>0</OtherIncreasesAmt>
        <SubtotalAmt>20269938</SubtotalAmt>
        <OtherDecreasesAmt referenceDocumentId="RetDoc2049800001">2</OtherDecreasesAmt>
        <TotNetAstOrFundBalancesEOYAmt>20269936</TotNetAstOrFundBalancesEOYAmt>
      </ChgInNetAssetsFundBalancesGrp>
      <CapGainsLossTxInvstIncmDetail>
        <CapGainsLossTxInvstIncmGrp>
          <PropertyDesc>$300,000 U.S. TREAS. NOTES 0.375% DUE 03/31/2022</PropertyDesc>
          <HowAcquiredCd>P</HowAcquiredCd>
          <AcquiredDt>2020-03-31</AcquiredDt>
          <SoldDt>2021-07-23</SoldDt>
          <GrossSalesPriceAmt>300633</GrossSalesPriceAmt>
          <CostOrOtherBasisAmt>299863</CostOrOtherBasisAmt>
          <GainOrLossAmt>770</GainOrLossAmt>
          <GainsMinusExcessOrLossesAmt>770</GainsMinusExcessOrLossesAmt>
        </CapGainsLossTxInvstIncmGrp>
        <CapGainsLossTxInvstIncmGrp>
          <PropertyDesc>$2,000,000 U.S. TREAS. NOTES 0.375% DUE 03/31/2022</PropertyDesc>
          <HowAcquiredCd>P</HowAcquiredCd>
          <AcquiredDt>2020-03-31</AcquiredDt>
          <SoldDt>2021-11-12</SoldDt>
          <GrossSalesPriceAmt>2002500</GrossSalesPriceAmt>
          <CostOrOtherBasisAmt>1999085</CostOrOtherBasisAmt>
          <GainOrLossAmt>3415</GainOrLossAmt>
          <GainsMinusExcessOrLossesAmt>3415</GainsMinusExcessOrLossesAmt>
        </CapGainsLossTxInvstIncmGrp>
        <CapGainsLossTxInvstIncmGrp>
          <PropertyDesc>$700,000 U.S. TREAS. NOTES 0.375% DUE 03/31/2022</PropertyDesc>
          <HowAcquiredCd>P</HowAcquiredCd>
          <AcquiredDt>2020-03-31</AcquiredDt>
          <SoldDt>2021-12-10</SoldDt>
          <GrossSalesPriceAmt>700438</GrossSalesPriceAmt>
          <CostOrOtherBasisAmt>699680</CostOrOtherBasisAmt>
          <GainOrLossAmt>758</GainOrLossAmt>
          <GainsMinusExcessOrLossesAmt>758</GainsMinusExcessOrLossesAmt>
        </CapGainsLossTxInvstIncmGrp>
        <CapitalGainNetIncomeAmt>4943</CapitalGainNetIncomeAmt>
      </CapGainsLossTxInvstIncmDetail>
      <ExciseTaxBasedOnInvstIncmGrp>
        <InvestmentIncomeExciseTaxAmt>7854</InvestmentIncomeExciseTaxAmt>
        <TaxUnderSection511Amt>0</TaxUnderSection511Amt>
        <SubtotalAmt>7854</SubtotalAmt>
        <SubtitleATaxAmt>0</SubtitleATaxAmt>
        <TaxBasedOnInvestmentIncomeAmt>7854</TaxBasedOnInvestmentIncomeAmt>
        <EstimatedPlusOvpmtIncmTxAmt>60127</EstimatedPlusOvpmtIncmTxAmt>
        <ExemptFrgnOrgTaxWthldAtSrceAmt>0</ExemptFrgnOrgTaxWthldAtSrceAmt>
        <ExtsnRequestIncomeTaxPaidAmt>0</ExtsnRequestIncomeTaxPaidAmt>
        <BackupWithholdingWithheldAmt>0</BackupWithholdingWithheldAmt>
        <TotalPaymentsAndCreditsAmt>60127</TotalPaymentsAndCreditsAmt>
        <Form2220AttachedInd referenceDocumentId="RetDoc1192000001">X</Form2220AttachedInd>
        <EsPenaltyAmt>0</EsPenaltyAmt>
        <OverpaymentAmt>52273</OverpaymentAmt>
        <AppliedToESTaxAmt>52273</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>1</Section508eRqrSatisfiedInd>
        <AtLeast5000InAssetsInd>1</AtLeast5000InAssetsInd>
        <OrgReportOrRegisterStateCd>MA</OrgReportOrRegisterStateCd>
        <Form990PFFiledWithAttyGenInd>1</Form990PFFiledWithAttyGenInd>
        <PrivateOperatingFoundationInd>0</PrivateOperatingFoundationInd>
        <NewSubstantialContributorsInd>0</NewSubstantialContributorsInd>
        <OwnControlledEntityInd>0</OwnControlledEntityInd>
        <DonorAdvisedFundInd>0</DonorAdvisedFundInd>
        <ComplyWithPublicInspRqrInd>1</ComplyWithPublicInspRqrInd>
        <WebsiteAddressTxt>N/A</WebsiteAddressTxt>
        <IndividualWithBooksNm>CHRISTOPHER C CURTIS ESQ</IndividualWithBooksNm>
        <PhoneNum>6173382800</PhoneNum>
        <LocationOfBooksUSAddress>
          <AddressLine1Txt>SULLIVAN WORCESTER LLP 1 POST</AddressLine1Txt>
          <AddressLine2Txt>OFFICE SQUARE</AddressLine2Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02109</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>ALAN J DWORSKY DECEASED 01192021</PersonNm>
          <USAddress>
            <AddressLine1Txt>8 MERCER CIRCLE</AddressLine1Txt>
            <CityNm>CAMBRIDGE</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02138</ZIPCd>
          </USAddress>
          <TitleTxt>TRUSTEE</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.00</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>SUZANNE E WERBER DWORSKY</PersonNm>
          <USAddress>
            <AddressLine1Txt>8 MERCER CIRCLE</AddressLine1Txt>
            <CityNm>CAMBRIDGE</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02138</ZIPCd>
          </USAddress>
          <TitleTxt>TRUSTEE</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.00</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>SALLY L RUBIN</PersonNm>
          <USAddress>
            <AddressLine1Txt>83 KIRKSTALL ROAD</AddressLine1Txt>
            <CityNm>NEWTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02460</ZIPCd>
          </USAddress>
          <TitleTxt>TRUSTEE</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>0.00</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>32865715</AverageMonthlyFMVOfSecAmt>
        <AverageMonthlyCashBalancesAmt>1115219</AverageMonthlyCashBalancesAmt>
        <FMVAllOtherNoncharitableAstAmt>0</FMVAllOtherNoncharitableAstAmt>
        <TotalFMVOfUnusedAssetsAmt>33980934</TotalFMVOfUnusedAssetsAmt>
        <ReductionClaimedAmt>0</ReductionClaimedAmt>
        <AcquisitionIndebtednessAmt>0</AcquisitionIndebtednessAmt>
        <AdjustedTotalFMVOfUnusedAstAmt>33980934</AdjustedTotalFMVOfUnusedAstAmt>
        <CashDeemedCharitableAmt>509714</CashDeemedCharitableAmt>
        <NetVlNoncharitableAssetsAmt>33471220</NetVlNoncharitableAssetsAmt>
        <MinimumInvestmentReturnAmt>1673561</MinimumInvestmentReturnAmt>
      </MinimumInvestmentReturnGrp>
      <DistributableAmountGrp>
        <MinimumInvestmentReturnAmt>1673561</MinimumInvestmentReturnAmt>
        <TaxBasedOnInvestmentIncomeAmt>7854</TaxBasedOnInvestmentIncomeAmt>
        <TotalTaxAmt>7854</TotalTaxAmt>
        <DistributableBeforeAdjAmt>1665707</DistributableBeforeAdjAmt>
        <RecoveriesQualfiedDistriAmt>0</RecoveriesQualfiedDistriAmt>
        <DistributableBeforeDedAmt>1665707</DistributableBeforeDedAmt>
        <DeductionFromDistributableAmt>0</DeductionFromDistributableAmt>
        <DistributableAsAdjustedAmt>1665707</DistributableAsAdjustedAmt>
      </DistributableAmountGrp>
      <PFQualifyingDistributionsGrp>
        <ExpensesAndContributionsAmt>5789736</ExpensesAndContributionsAmt>
        <ProgramRelatedInvstTotalAmt>0</ProgramRelatedInvstTotalAmt>
        <QualifyingDistributionsAmt>5789736</QualifyingDistributionsAmt>
      </PFQualifyingDistributionsGrp>
      <UndistributedIncomeGrp>
        <DistributableAsAdjustedAmt>1665707</DistributableAsAdjustedAmt>
        <UndistributedIncomePYAmt>0</UndistributedIncomePYAmt>
        <TotalForPriorYearsAmt>0</TotalForPriorYearsAmt>
        <ExcessDistributionCyovYr5Amt>5292728</ExcessDistributionCyovYr5Amt>
        <ExcessDistributionCyovYr3Amt>2531110</ExcessDistributionCyovYr3Amt>
        <ExcessDistributionCyovYr1Amt>16278584</ExcessDistributionCyovYr1Amt>
        <TotalExcessDistributionCyovAmt>24102422</TotalExcessDistributionCyovAmt>
        <QualifyingDistributionsAmt>5789736</QualifyingDistributionsAmt>
        <AppliedToYear1Amt>0</AppliedToYear1Amt>
        <AppliedToPriorYearsAmt>0</AppliedToPriorYearsAmt>
        <TreatedAsDistriFromCorpusAmt>0</TreatedAsDistriFromCorpusAmt>
        <AppliedToCurrentYearAmt>1665707</AppliedToCurrentYearAmt>
        <RemainingDistriFromCorpusAmt>4124029</RemainingDistriFromCorpusAmt>
        <ExcessDistriCyovAppCYCorpusAmt>0</ExcessDistriCyovAppCYCorpusAmt>
        <ExcessDistributionCyovAppCYAmt>0</ExcessDistributionCyovAppCYAmt>
        <TotalCorpusAmt>28226451</TotalCorpusAmt>
        <PriorYearUndistributedIncmAmt>0</PriorYearUndistributedIncmAmt>
        <PriorYearDeficiencyOrTaxAmt>0</PriorYearDeficiencyOrTaxAmt>
        <Taxable1Amt>0</Taxable1Amt>
        <Taxable2Amt>0</Taxable2Amt>
        <UndistributedIncomeCYAmt>0</UndistributedIncomeCYAmt>
        <CorpusDistri170b1EOr4942g3Amt>0</CorpusDistri170b1EOr4942g3Amt>
        <ExcessDistriCyovFromYr5Amt>5292728</ExcessDistriCyovFromYr5Amt>
        <ExcessDistriCyovToNextYrAmt>22933723</ExcessDistriCyovToNextYrAmt>
        <ExcessFromYear3Amt>2531110</ExcessFromYear3Amt>
        <ExcessFromYear1Amt>16278584</ExcessFromYear1Amt>
        <ExcessFromCurrentYearAmt>4124029</ExcessFromCurrentYearAmt>
      </UndistributedIncomeGrp>
      <SupplementaryInformationGrp>
        <OnlyContriToPreselectedInd>X</OnlyContriToPreselectedInd>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>BOSTON CITY SINGERS INC</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>17 WALDECK STREET</AddressLine1Txt>
            <CityNm>DORCHESTER</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02124</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>70000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>CAMBRIDGE PUBLIC SCHOOLS</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>159 THORNDIKE STREET</AddressLine1Txt>
            <CityNm>CAMBRIDGE</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02141</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>293299</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>FOOD FOR FREE</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>11 INMAN STREET</AddressLine1Txt>
            <CityNm>CAMBRIDGE</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02139</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>300000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>FOOD LINK INC</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>32 OLDHAM ROAD</AddressLine1Txt>
            <CityNm>ARLINGTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02474</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>50000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>MASSACHUSETTS INSTITUTE OF TECHNOLOGY</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>77 MASSACHUSETTS AVENUE</AddressLine1Txt>
            <CityNm>CAMBRIDGE</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02139</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>3000000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>NATIONAL PARKS FOUNDATION</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>1110 VERMONT AVE NW</AddressLine1Txt>
            <CityNm>WASHINGTON</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20005</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GERERAL USE</GrantOrContributionPurposeTxt>
          <Amt>300000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>PARENTCHILD INC</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>163B MINEOLA BOULEVARD</AddressLine1Txt>
            <CityNm>MINEOLA</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>11501</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>500000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>SOUTHERN POVERTY LAW CENTER INC</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>400 WASHINGTON AVENUE</AddressLine1Txt>
            <CityNm>MONTGOMERY</CityNm>
            <StateAbbreviationCd>AL</StateAbbreviationCd>
            <ZIPCd>36104</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>300000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>THE GREATER BOSTON FOOD BANK INC</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>70 SOUTH BAY AVENUE</AddressLine1Txt>
            <CityNm>BOSTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02118</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>750000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>WOMEN'S LUNCH PLACE</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>67 NEWBURY STREET</AddressLine1Txt>
            <CityNm>BOSTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02116</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL USE</GrantOrContributionPurposeTxt>
          <Amt>200000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <TotalGrantOrContriPdDurYrAmt>5763299</TotalGrantOrContriPdDurYrAmt>
        <TotalGrantOrContriApprvFutAmt>0</TotalGrantOrContriApprvFutAmt>
      </SupplementaryInformationGrp>
      <AnalysisIncomeProducingActyGrp>
        <IntOnSavAndTempCashInvstGrp>
          <ExclusionCd>14</ExclusionCd>
        </IntOnSavAndTempCashInvstGrp>
        <DividendsAndInterestFromSecDtl>
          <ExclusionCd>14</ExclusionCd>
          <ExclusionAmt>575834</ExclusionAmt>
        </DividendsAndInterestFromSecDtl>
        <OtherInvestmentIncomeGrp>
          <BusinessCd>541700</BusinessCd>
          <UnrelatedBusinessTaxblIncmAmt>25744</UnrelatedBusinessTaxblIncmAmt>
        </OtherInvestmentIncomeGrp>
        <GainSalesAstOthThanInvntryGrp>
          <ExclusionCd>18</ExclusionCd>
          <ExclusionAmt>4943</ExclusionAmt>
        </GainSalesAstOthThanInvntryGrp>
        <SubtotalsIncmProducingActyGrp>
          <UnrelatedBusinessTaxblIncmAmt>25744</UnrelatedBusinessTaxblIncmAmt>
          <ExclusionAmt>580777</ExclusionAmt>
          <RelatedOrExemptFunctionIncmAmt>0</RelatedOrExemptFunctionIncmAmt>
        </SubtotalsIncmProducingActyGrp>
        <TotalIncomeProducingActyAmt>606521</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>
    <GeneralExplanationAttachment documentId="RetDoc2258700001">
      <GeneralExplanationGrp>
        <FormAndLineReferenceDesc>FORM 990-PF, PART II, LINES 2, 16, 30, PART XII, LINE 3E</FormAndLineReferenceDesc>
        <MediumExplanationTxt>IN PREPARING THE 2020 FORM 990-PF, THE PREPARER INADVERTENTLY LEFT OFF THE CASH BALANCES AN AMOUNT OF $33,949.45 OF MUTUAL FUND DIVIDENDS INCLUDED ON THE FOUNDATION'S 2019 NET INVESTMENT INCOME BUT NOT INCLUDED IN THE FOUNDATION'S CASH BALANCES UNTIL EARLY JANUARY 2020. ACCORDINGLY THE YEAR END CASH BALANCE AND OVERALL ASSET BALANCE DID NOT INCLUDE THE $33,949.45 AMOUNT. THE BEGINNING OF YEAR CASH BALANCE HAS BEEN INCREASED BY THAT AMOUNT.TO REFLECT THE ADDITIONAL CASH THAT SHOULD HAVE BEEN COUNTED IN DETERMINING THE DISTRIBUTABLE AMOUNT ON THE 2020 FORM 990-PF, THE EXCESS DISTRIBUTIONS CARRYOVER TO 2021 FROM 2020 ON THIS 2021 FORM 990-PF, PART XII, LINE 3E, HAS BEEN REDUCED BY $1,672, FROM $16,280,256 TO $16,278,584.</MediumExplanationTxt>
      </GeneralExplanationGrp>
    </GeneralExplanationAttachment>
    <InvestmentsCorpStockSchedule documentId="RetDoc2018900001">
      <InvestmentsCorporateStockGrp>
        <StockNm>ABBVIE INC.</StockNm>
        <EOYBookValueAmt>3585684</EOYBookValueAmt>
        <EOYFMVAmt>13540000</EOYFMVAmt>
      </InvestmentsCorporateStockGrp>
      <InvestmentsCorporateStockGrp>
        <StockNm>ENANTA PHARMACEUTICALS INC.</StockNm>
        <EOYBookValueAmt>5691389</EOYBookValueAmt>
        <EOYFMVAmt>11141397</EOYFMVAmt>
      </InvestmentsCorporateStockGrp>
    </InvestmentsCorpStockSchedule>
    <InvestmentsGovtObligationsSch documentId="RetDoc2210400001">
      <USGovtObligationsBookVlEOYAmt>8958211</USGovtObligationsBookVlEOYAmt>
      <USGovtObligationsEOYFMVAmt>8796250</USGovtObligationsEOYFMVAmt>
      <StateLocalSecBookVlEOYAmt>0</StateLocalSecBookVlEOYAmt>
      <StateLocalSecEOYFMVAmt>0</StateLocalSecEOYFMVAmt>
    </InvestmentsGovtObligationsSch>
    <InvestmentsOtherSchedule2 documentId="RetDoc2018100001">
      <InvestmentsOtherGrp>
        <CategoryOrItemTxt>BIOVENTURES INVESTORS, LPII</CategoryOrItemTxt>
        <ListedAtCostOrFMVCd>AT COST</ListedAtCostOrFMVCd>
        <BookValueAmt>1041439</BookValueAmt>
        <EOYFMVAmt>1041439</EOYFMVAmt>
      </InvestmentsOtherGrp>
    </InvestmentsOtherSchedule2>
    <LegalFeesSchedule documentId="RetDoc2002100001">
      <LegalFeesGrp>
        <CategoryTxt>SULLIVAN &amp; WORCESTER LLP</CategoryTxt>
        <LegalFeesAmt>26187</LegalFeesAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>26187</DisbursementsCharitablePrpsAmt>
      </LegalFeesGrp>
    </LegalFeesSchedule>
    <OtherAssetsSchedule documentId="RetDoc2046600001">
      <OtherAssetsScheduleGrp>
        <Desc>DISTRIBUTION RECEIVABLE FROM BIOVENTURES INVESTORS LP II</Desc>
        <BOYBookValueAmt>52832</BOYBookValueAmt>
        <EOYBookValueAmt>0</EOYBookValueAmt>
        <EOYFMVAmt>0</EOYFMVAmt>
      </OtherAssetsScheduleGrp>
    </OtherAssetsSchedule>
    <OtherDecreasesSchedule documentId="RetDoc2049800001">
      <OtherDecreasesDetail>
        <Desc>ROUNDING</Desc>
        <Amt>2</Amt>
      </OtherDecreasesDetail>
    </OtherDecreasesSchedule>
    <OtherExpensesSchedule documentId="RetDoc2003200001">
      <OtherExpensesScheduleGrp>
        <Desc>CUSTODIAL FEE (FIDUCIARY TRUST CO.)</Desc>
        <RevenueAndExpensesPerBooksAmt>15263</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>15263</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>2020 MA FORM PC FILING FEE</Desc>
        <RevenueAndExpensesPerBooksAmt>250</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>250</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>TAX RETURN SVC. (FIDUCIARY TR CO.)</Desc>
        <RevenueAndExpensesPerBooksAmt>490</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>490</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>BIOVENTURES INVESTORS LIMITED K-1 INTEREST EXPENSE</Desc>
        <RevenueAndExpensesPerBooksAmt>29140</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
      <OtherExpensesScheduleGrp>
        <Desc>BIOVENTURES INVESTORS LIMITED K-1 DEDUCTIONS</Desc>
        <RevenueAndExpensesPerBooksAmt>2630</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </OtherExpensesScheduleGrp>
    </OtherExpensesSchedule>
    <OtherIncomeSchedule2 documentId="RetDoc2001500001">
      <OtherIncomeDetail>
        <Desc>BIOVENTURES INVESTORS LP II ORDINARY BUSINESS INCOME</Desc>
        <RevenueAndExpensesPerBooksAmt>-857</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
      </OtherIncomeDetail>
      <OtherIncomeDetail>
        <Desc>BIOVENTURES INVESTORS LP II DEBT-FINANCED INTEREST INCOME</Desc>
        <RevenueAndExpensesPerBooksAmt>26601</RevenueAndExpensesPerBooksAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <AdjustedNetIncomeAmt>0</AdjustedNetIncomeAmt>
      </OtherIncomeDetail>
    </OtherIncomeSchedule2>
    <TaxesSchedule documentId="RetDoc2002500001">
      <TaxesDetail>
        <CategoryTxt>2020 TAX PAYMENTS FORM 990-PF</CategoryTxt>
        <Amt>82000</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </TaxesDetail>
      <TaxesDetail>
        <CategoryTxt>2020 TAX PAYMENT FORM 990-T</CategoryTxt>
        <Amt>2000</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </TaxesDetail>
      <TaxesDetail>
        <CategoryTxt>2020 TAX PAYMENT MA FORM M-990T-62</CategoryTxt>
        <Amt>3100</Amt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
        <DisbursementsCharitablePrpsAmt>0</DisbursementsCharitablePrpsAmt>
      </TaxesDetail>
    </TaxesSchedule>
  </ReturnData>
</Return>
