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        <EOYAmt>2100437</EOYAmt>
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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>US SIF IS EXEMPT FROM FEDERAL AND LOCAL INCOME TAXES UNDER SECTION 501(C)(6) OF THE INTERNAL REVENUE CODE ON INCOME DERIVED FROM ACTIVITIES RELATED TO THEIR EXEMPT PURPOSE. THE FOUNDATION IS EXEMPT FROM FEDERAL AND LOCAL INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE ON INCOME DERIVED FROM ACTIVITIES RELATED TO THEIR EXEMPT PURPOSE. US SIF AND THE FOUNDATION ARE NOT PRIVATE FOUNDATIONS FOR TAX PURPOSES. THE ORGANIZATION IS NOT AWARE OF ANY ACTIVITIES THAT WOULD JEOPARDIZE THEIR TAX-EXEMPT STATUS THAT WOULD REQUIRE RECOGNITION IN THE ACCOMPANYING CONSOLIDATED FINANCIAL STATEMENTS. GENERALLY, TAX RETURNS ARE SUBJECT TO EXAMINATION BY TAXING AUTHORITIES FOR UP TO THREE YEARS FROM THE DATE A COMPLETED RETURN IS FILED. IF MATERIAL OMISSIONS OF INCOME EXIST, TAX RETURNS MAY BE SUBJECT TO EXAMINATION FOR UP TO SIX YEARS. IT IS THE ORGANIZATION'S POLICY TO RECOGNIZE INTEREST AND/OR PENALTIES RELATED TO UNCERTAIN TAX POSITIONS, IF ANY, IN THE ACCOMPANYING CONSOLIDATED FINANCIAL STATEMENTS. AS OF DECEMBER 31, 2023 AND 2022, THE ORGANIZATION HAD NO UNCERTAIN TAX POSITIONS WHICH SHOULD BE RECOGNIZED AS A LIABILITY. THE ORGANIZATION IS NO LONGER SUBJECT TO U.S. FEDERAL OR STATE EXAMINATIONS BY TAX AUTHORITIES FOR TAX YEARS PRIOR TO 2020.</ExplanationTxt>
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      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BRYAN M MCGANNON</PersonNm>
        <TitleTxt>MANAGING DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>155641</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>6226</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>11810</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>186177</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MARIA A LETTINI BEG 51523</PersonNm>
        <TitleTxt>CEO (CHIEF EXECUTIVE OFFICER)</TitleTxt>
        <BaseCompensationFilingOrgAmt>173039</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <DeferredCompensationFlngOrgAmt>5053</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>6157</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>184249</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LISA WOLL THRU 6123</PersonNm>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>15000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>30636</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>6142</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>567</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>160250</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>IN 2023, THERE WERE APPROXIMATELY 200 MEMBERS, 11 OF WHICH WERE REPRESENTED ON THE GOVERNING BOARD AT YEAR-END.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD SHALL CONSIST OF NOT MORE THAN SEVENTEEN (17) AND NOT LESS THAN NINE (9) DIRECTORS, THE MAJORITY SHALL BE ELECTED BY THE MEMBERSHIP, AND SHOULD GENERALLY REFLECT THE DIVERSITY OF PRACTITIONERS, EXPERIENCE AND MEMBER TYPES AND FIELD OF PRACTICE FOUND WITHIN THE MEMBERSHIP BASE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>DECISIONS BY THE BOARD TO AMEND THE BYLAWS MUST BE APPROVED BY A MAJORITY OF MEMBERS AT THE ANNUAL MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE DRAFT 990 IS SENT TO THE AUDIT COMMITTEE FOR THEIR REVIEW. AFTER THAT REVIEW IS COMPLETED, THE RETURN IS SENT TO THE FULL GOVERNING BODY PRIOR TO FILING THE FORM WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH DIRECTOR SHALL PROVIDE AN ANNUAL DISCLOSURE STATEMENT TO THE ORGANIZATION IDENTIFYING: (I) EACH ORGANIZATION FOR WHICH THE DIRECTOR IS A DIRECTOR OR EXECUTIVE (OR HOLDS AN EQUIVALENT POSITION) OR BY WHICH THE DIRECTOR IS EMPLOYED, AND (II) EACH INVESTMENT, INTEREST, VOLUNTEER ACTIVITY, MEMBERSHIP OR OTHER MATTER THAT MAY CONFLICT OR INTERFERE WITH THE DIRECTOR'S POSITION ON THE BOARD OR THAT MAY CAUSE A CONFLICT OF INTEREST BETWEEN THE DIRECTOR'S DUTY TO THE ORGANIZATION AND THE INVESTMENT, INTEREST, ACTIVITY, MEMBERSHIP OR MATTER. (III) ANY CONFLICT OF INTEREST IDENTIFIED BY THE DIRECTORS OR THE ABSENCE OF ANY CONFLICT OF INTEREST TO THE BEST OF KNOWLEDGE OF THE DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD'S VOTING MEMBERS ANNUALLY EVALUATE PERFORMANCE OF THE CEO, AND DETERMINE CEO'S COMPENSATION. THE CEO ANNUALLY EVALUATES AND SETS COMPENSATION FOR SENIOR MANAGEMENT. OTHER COMPENSATION DECISIONS ARE MADE BY CEO AND SENIOR MANAGEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S AUDITED FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC ONLINE AS PART OF THE ORGANIZATION'S ANNUAL REPORT. GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FORM 990 ARE AVAILABLE TO MEMBERS THROUGH AN ONLINE MEMBER CENTER, AND TO THE GENERAL PUBLIC UPON REQUEST. RECENT 990'S FOR THE ORGANIZATION ARE ALSO AVAILABLE AT WWW.GUIDESTAR.ORG.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSULTING -MEDIA 53,198. CONSULTING -POLICY 96,000. OTHER 24,164.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF DIRECTORS ASSUME RESPONSILBILITY FOR OVERSIGHT OF THE AUDIT AND SELECTION OF AN INDEPENDENT ACCOUNTANT. THIS PROCESS HAS NOT CHANGED FROM PRIOR YEAR.</ExplanationTxt>
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          <BusinessNameLine1Txt>US SIF FOUNDATION</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>1660 L STREET NW 206</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <PrimaryActivitiesTxt>ADVANCES SUSTAINABLE AND RESPONSIBLE INVESTMENT PRACTICES.</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
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      <TransferToOtherOrgInd>1</TransferToOtherOrgInd>
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</Return>