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      <SupplementalInformationDetail>
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        <ExplanationTxt>1ST STREET FOUNDATION INC BELIEVES THAT IT HAS APPROPRIATE SUPPORT FOR ANY TAX POSITIONS TAKEN, AND AS SUCH, DOES NOT HAVE ANY UNCERTAIN TAX POSITIONS.</ExplanationTxt>
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        <NontaxableBenefitsFilingOrgAmt>23236</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>250989</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL AMODEO</PersonNm>
        <TitleTxt>HEAD OF DATA SCIENCE</TitleTxt>
        <BaseCompensationFilingOrgAmt>189129</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>26129</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>11376</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>226634</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>HELENA CAWLEY</PersonNm>
        <TitleTxt>GENERAL COUNCIL</TitleTxt>
        <BaseCompensationFilingOrgAmt>154626</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>22198</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>16874</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>193698</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="IRS990ScheduleL">
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Anthro Digital LLC</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>vendor</RelationshipDescriptionTxt>
        <TransactionAmt>149053</TransactionAmt>
        <TransactionDesc>rent and utilities</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCH L, PART IV, BUSINESS TRANSACTIONS INVOLVING INTERESTED PERSONS</FormAndLineReferenceDesc>
        <ExplanationTxt>The President and Executive of the Organization is a related party to both a company and a non-profit organization that the Organization has expense sharing agreements with. Shared expenses for rent and utilities were $149,053 for the year ended December 31, 2023.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A:</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPARABLE SALARIES OF OTHER RELATED NON-PROFITS WERE COMPILED AND VOTED ON BY THE BOARD OF DIRECTORS WITHOUT THE EXECUTIVE DIRECTOR'S VOTE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11:</FormAndLineReferenceDesc>
        <ExplanationTxt>A DRAFT OF FORM 990 IS SENT TO THE BOARD OF DIRECTORS FOR REVIEW AND APPROVAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19:</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 WILL BE AVAILABLE ONLINE AT WWW.GUIDESTAR.ORG AND WWW.ag.ny.gov. ALL DOCUMENTS ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF DIRECTORS OVERSIGHTS THE AUDIT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="IRS990ScheduleR">
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Risk Factor LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>215 PLYMOUTH STREET 3RD FLOOR</AddressLine1Txt>
          <CityNm>brooklyn</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>11201</ZIPCd>
        </USAddress>
        <EIN>851947511</EIN>
        <PrimaryActivitiesTxt>licensing</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <TotalIncomeAmt>3001358</TotalIncomeAmt>
        <EndOfYearAssetsAmt>247860</EndOfYearAssetsAmt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>1st street</BusinessNameLine1Txt>
        </DirectControllingEntityName>
      </IdDisregardedEntitiesGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCH R PART I:</FormAndLineReferenceDesc>
        <ExplanationTxt>On February 14, 2020, the Organization formed a wholly owned subsidiary, Risk Factor, LLC (the "Subsidiary"), as a Delaware limited liability company. The Subsidiary was formed to explore the licensing of intellectual property created by the Organization.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>