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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DOUG REES</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LUKE ZHOU</PersonNm>
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      <Form990PartVIISectionAGrp>
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        <FormAndLineReferenceDesc>Support Schedule: Additional Supplemental Information</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTRIBUTIONS NOT REPORTED AS REVENUE (PART II OR PART III, LINE 1) NODIRECT MONETARY SUPPORT WAS PROVIDED TO THE CALIFORNIA INSTITUTE OFTECHNOLOGY ("CALTECH"). HOWEVER, THE FOLLOWING SERVICES WERE PROVIDEDTO THE STUDENTS OF CALTECH: THE STUDENT EXECUTIVE COMMITTEE (EXCOMM),OUTDOOR ADVENTURE PROGRAMS, SOCIAL ACTIVISM SPEAKER SERIES, COMMUNITYSERVICE PROJECTS, INTERNATIONAL FOOD FESTIVAL, MARTIN LUTHER KING JR.COMMEMORATION WEEK EVENTS, DECOMPRESSION, UNION STATION HOMELESSSHELTER, ALTERNATIVE SPRING BREAK, MAKE-A-DIFFERENCE DAY, WASHINGTOND.C. SCIENCE POLICY TRIP, EXPLORE LA, AND LIFE SKILLS EDUCATIONPROGRAMS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part IV, Section E, Line 2a: Identify Supported Orgs. and Explain How Activities Furthered Exempt Pu</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MISSION OF THE CALTECH Y IS HARMONIOUS WITH THAT OF THE INSTITUTE.SEE LIST OF PROGRAMS PROVIDED IN SCHEDULE O (SUPPLEMENTAL INFO). THEACTIVITIES OF THE Y, WHICH ARE IN SUPPORT OF THE STUDENTS AT CALTECHCOMPRISE 100% OF THE ORGANIZATION'S PROGRAM SERVICES.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Part IV, Section E, Line 2b: Reasons For The Organization's Position</FormAndLineReferenceDesc>
        <ExplanationTxt>THE STUDENT PROGRAM ACTIVITIES CONDUCTED THROUGH THE CALTECH Y (SEELIST PROVIDED IN SCHEDULE O) WOULD IN LARGE PART BE PROVIDED BY THEINSTITUTE WERE IT NOT FOR THE EXISTENCE OF THE Y. HOWEVER, THEINDEPENDENCE OF THE Y ALLOWS IT TO HOST CERTAIN SPEAKERS AND EVENTSTHAT THE INSTITUTE WOULD NOT NORMALLY ACCOMMODATE.</ExplanationTxt>
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        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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        <ContributionsAmt>23400</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1107507</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>382385</OtherExpendituresAmt>
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        <InvestmentEarningsOrLossesAmt>1555654</InvestmentEarningsOrLossesAmt>
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        <EndYearBalanceAmt>10747743</EndYearBalanceAmt>
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        <ContributionsAmt>11100</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>965028</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>273329</OtherExpendituresAmt>
        <EndYearBalanceAmt>9465345</EndYearBalanceAmt>
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        <ContributionsAmt>7910</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-1225953</InvestmentEarningsOrLossesAmt>
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        <EndYearBalanceAmt>8762546</EndYearBalanceAmt>
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        <ContributionsAmt>2873563</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>2232906</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>2279921</OtherExpendituresAmt>
        <EndYearBalanceAmt>6247624</EndYearBalanceAmt>
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      <BoardDesignatedBalanceEOYPct>0.14000</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.81000</PrmnntEndowmentBalanceEOYPct>
      <TermEndowmentBalanceEOYPct>0.05000</TermEndowmentBalanceEOYPct>
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      <EndowmentsHeldRelatedOrgInd>true</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>true</RelatedOrgListSchRInd>
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        <DepreciationAmt>22779</DepreciationAmt>
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      <OtherAssetsOrgGrp>
        <Desc>BENEFICIAL INTEREST IN ENDOWMENT FUNDS</Desc>
        <BookValueAmt>6085890</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>6085890</TotalBookValueOtherAssetsAmt>
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    <IRS990ScheduleI documentId="IRS990ScheduleI" softwareId="24020490" softwareVersionNum="2024v5.2">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <Total501c3OrgCnt>0</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>SCHOLARSHIPS</GrantTypeTxt>
        <RecipientCnt>10</RecipientCnt>
        <CashGrantAmt>8150</CashGrantAmt>
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      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>AWARDS</GrantTypeTxt>
        <RecipientCnt>20</RecipientCnt>
        <CashGrantAmt>39494</CashGrantAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Additional Supplemental Information</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CALTECH Y UTILIZES STAFF LED COMMITTEES TO REVIEW AND SELECT ANNUAL AWARDEES AND SCHOLARSHIP RECIPIENTS.</ExplanationTxt>
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      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ATHENA R CASTRO</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>160920</BaseCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>11264</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>1621</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>173805</TotalCompensationFilingOrgAmt>
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      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>IN-KIND RENTAL</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>75600</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>false</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
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    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020490" softwareVersionNum="2024v5.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 8b</FormAndLineReferenceDesc>
        <ExplanationTxt>ALTHOUGH NO COMMITTEE HAS AUTHORITY TO ACT ON BEHALF OF THE GOVERNING BODY,MINUTES OF COMMITTEE MEETINGS ARE DOCUMENTED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS DISTRIBUTED TO FINANCE COMMITTEE FOR DETAILED REVIEW PRIOR TOFILING AND IS AVAILABLE TO ENTIRE BOARD OF DIRECTORS UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, MANAGEMENT CIRCULATES QUESTIONNAIRE TO BOARD OF DIRECTORSINQUIRING IF THERE ARE ANY CONFLICTS OF INTEREST OR RELATED-PARTYTRANSACTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBERS OF THE EXECUTIVE, GOVERNANCE, AND FINANCE COMMITTEES REVIEW THECOMPENSATION OF THE EXECUTIVE DIRECTOR ANNUALLY. PERIODICALLY, BUT NOTNECESSARILY ANNUALLY, THEY WOULD REVIEW THE COMPENSATION OF THE PROGRAMDIRECTOR, DEVELOPMENT DIRECTOR AND/OR OTHER STAFF. THEIR COMPENSATIONREVIEW TAKES INTO CONSIDERATION COMPARABILITY DATA OF OTHER NON-PROFITORGANIZATIONS IN LOS ANGELES COUNTY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 18</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, GOVERNING DOCUMENTS, POLICIES AND FINANCIAL INFORMATION ARE AVAILABLE FOR INSPECTION AT THE CALTECH Y OFFICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS POSTED TO THE WEBSITE FOR THE CALIFORNIA ATTORNEY GENERAL'SREGISTRY OF CHARITIES AND FUNDRAISERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VIII, LINE 6D:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE RENTAL INCOME RELATES TO CAMPING AND EVENT EQUIPMENT RENTED TOSTUDENTS AND THE CALTECH COMMUNITY FOR CAMPING TRIPS AND OTHEREXTRACURRICULAR ACTIVITIES. THIS ITEM IS TIED TO THE CALTECH Y'SOVERALL MISSION TO ENRICH STUDENT LIFE BY FOSTERING COMMUNITY ANDENCOURAGING A BALANCED LIFESTYLE THROUGH RECREATION.</ExplanationTxt>
      </SupplementalInformationDetail>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>CALIFORNIA INSTITUTE OF TECHNOLOGY</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>1200 E CALIFORNIA BLVD</AddressLine1Txt>
          <CityNm>PASADENA</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>91125</ZIPCd>
        </USAddress>
        <EIN>951643307</EIN>
        <PrimaryActivitiesTxt>HIGHER EDUCATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>CA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 2</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>false</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>false</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>true</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>false</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>false</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>false</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>false</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>false</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>false</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>false</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>false</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>false</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>true</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>false</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>false</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>false</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>CALIFORNIA INSTITUTE OF TECHNOLOGY</BusinessNameLine1Txt>
        </OtherOrganizationName>
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        <MethodOfAmountDeterminationTxt>CASH</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
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        </OtherOrganizationName>
        <TransactionTypeTxt>p</TransactionTypeTxt>
        <InvolvedAmt>54287</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>CASH</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE R - ADDITIONAL INFORMATION:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION OPERATES FROM A FACILITY OWNED BY THE CALIFORNIAINSTITUTUE OF TECHNOLOGY ("CALTECH"). CALTECH DOES NOT CHARGE THEORGANIZATION RENT FOR USE OF THE FACILITIES.</ExplanationTxt>
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</Return>