﻿<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" returnVersion="2024v5.1">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2025-11-13T11:23:03+00:00</ReturnTs>
    <TaxPeriodEndDt>2025-06-30</TaxPeriodEndDt>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2024-07-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>020513199</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>MDM Observatory Consortium Inc</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>MDMO</BusinessNameControlTxt>
      <PhoneNum>6036463011</PhoneNum>
      <USAddress>
        <AddressLine1Txt>c/o Dartmouth 7 Lebanon St No 302</AddressLine1Txt>
        <CityNm>Hanover</CityNm>
        <StateAbbreviationCd>NH</StateAbbreviationCd>
        <ZIPCd>03755</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Kate Soule</PersonNm>
      <PersonTitleTxt>Treasurer</PersonTitleTxt>
      <SignatureDt>2025-11-13</SignatureDt>
    </BusinessOfficerGrp>
    <TaxYr>2024</TaxYr>
    <BuildTS>2025-03-06 01:10:19Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="4">
    <IRS990 documentId="IRS990" softwareId="24020961" softwareVersionNum="2024v5.1">
      <PrincipalOfcrBusinessName>
        <BusinessNameLine1Txt>John Thorstensen</BusinessNameLine1Txt>
      </PrincipalOfcrBusinessName>
      <USAddress>
        <AddressLine1Txt>c/o Dartmouth 7 Lebanon St No 302</AddressLine1Txt>
        <CityNm>Hanover</CityNm>
        <StateAbbreviationCd>NH</StateAbbreviationCd>
        <ZIPCd>03755</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>577696</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>false</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>http://mdm.kpno.noirlab.edu</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>1998</FormationYr>
      <LegalDomicileStateCd>NH</LegalDomicileStateCd>
      <ActivityOrMissionDesc>To provide opportunities for education and research in the fields of astronomy and astrophysics.</ActivityOrMissionDesc>
      <VotingMembersGoverningBodyCnt>5</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>5</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <TotalVolunteersCnt>6</TotalVolunteersCnt>
      <TotalGrossUBIAmt>0</TotalGrossUBIAmt>
      <PYContributionsGrantsAmt>0</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>0</CYContributionsGrantsAmt>
      <PYProgramServiceRevenueAmt>587289</PYProgramServiceRevenueAmt>
      <CYProgramServiceRevenueAmt>504840</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>82068</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>72856</CYInvestmentIncomeAmt>
      <CYOtherRevenueAmt>0</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>669357</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>577696</CYTotalRevenueAmt>
      <CYGrantsAndSimilarPaidAmt>0</CYGrantsAndSimilarPaidAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <CYSalariesCompEmpBnftPaidAmt>0</CYSalariesCompEmpBnftPaidAmt>
      <CYTotalProfFndrsngExpnsAmt>0</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>0</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>542174</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>465947</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>542174</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>465947</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>127183</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>111749</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>1586136</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>1697884</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>0</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>0</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>1586136</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>1697884</NetAssetsOrFundBalancesEOYAmt>
      <MissionDesc>MDM Observatory Consortium, Inc.'s mission is to provide opportunities for education and research in the fields of astronomy and astrophysics; to promote and advance the studies of astronomy, astrophysics and related fields; to own, lease, operate, acquire, purchase, dispose of, transfer, sell and otherwise deal with facilities appropriate to the foregoing purposes including without limitation, observatories, telescopes, and other items.</MissionDesc>
      <SignificantNewProgramSrvcInd>false</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>false</SignificantChangeInd>
      <ExpenseAmt>465947</ExpenseAmt>
      <RevenueAmt>504840</RevenueAmt>
      <Desc>The function of the Consortium is to own and operate an astronomical observatory to provide opportunities for scientific research and education for the faculty, research scientists, and students of its member institutions.</Desc>
      <TotalProgramServiceExpensesAmt>465947</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="IRS990ScheduleA">true</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd>false</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd referenceDocumentId="IRS990ScheduleC">false</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd>false</DonorAdvisedFundInd>
      <ConservationEasementsInd>false</ConservationEasementsInd>
      <CollectionsOfArtInd>false</CollectionsOfArtInd>
      <CreditCounselingInd>false</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd>false</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd referenceDocumentId="IRS990ScheduleD">true</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd>false</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd>false</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd>false</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd>false</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd>false</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd>false</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd>false</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <ForeignActivitiesInd>false</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>false</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>false</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd>false</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd>false</FundraisingActivitiesInd>
      <GamingActivitiesInd>false</GamingActivitiesInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <GrantsToOrganizationsInd>false</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd>false</GrantsToIndividualsInd>
      <ScheduleJRequiredInd>false</ScheduleJRequiredInd>
      <TaxExemptBondsInd>false</TaxExemptBondsInd>
      <EscrowAccountInd>false</EscrowAccountInd>
      <OnBehalfOfIssuerInd>false</OnBehalfOfIssuerInd>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>false</PYExcessBenefitTransInd>
      <LoanOutstandingInd>false</LoanOutstandingInd>
      <GrantToRelatedPersonInd>false</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>false</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>false</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>false</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>false</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>false</DeductibleArtContributionInd>
      <TerminateOperationsInd>false</TerminateOperationsInd>
      <PartialLiquidationInd>false</PartialLiquidationInd>
      <DisregardedEntityInd>false</DisregardedEntityInd>
      <RelatedEntityInd>false</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd>false</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>true</ScheduleORequiredInd>
      <IRPDocumentCnt>0</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <EmployeeCnt>0</EmployeeCnt>
      <UnrelatedBusIncmOverLimitInd>false</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>false</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>false</NondeductibleContributionsInd>
      <QuidProQuoContributionsInd>false</QuidProQuoContributionsInd>
      <Form8282PropertyDisposedOfInd>false</Form8282PropertyDisposedOfInd>
      <RcvFndsToPayPrsnlBnftCntrctInd>false</RcvFndsToPayPrsnlBnftCntrctInd>
      <PayPremiumsPrsnlBnftCntrctInd>false</PayPremiumsPrsnlBnftCntrctInd>
      <IndoorTanningServicesInd>false</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>false</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>false</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>5</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>5</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>false</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>false</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>false</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>false</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>true</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>true</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>false</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>true</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>false</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>false</OfficerMailingAddressInd>
      <LocalChaptersInd>false</LocalChaptersInd>
      <PoliciesReferenceChaptersInd>false</PoliciesReferenceChaptersInd>
      <Form990ProvidedToGvrnBodyInd>true</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>true</ConflictOfInterestPolicyInd>
      <AnnualDisclosureCoveredPrsnInd>true</AnnualDisclosureCoveredPrsnInd>
      <RegularMonitoringEnfrcInd>true</RegularMonitoringEnfrcInd>
      <WhistleblowerPolicyInd>true</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>false</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>false</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>false</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>false</InvestmentInJointVentureInd>
      <WrittenPolicyOrProcedureInd>false</WrittenPolicyOrProcedureInd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <BusinessName>
          <BusinessNameLine1Txt>DARTMOUTH COLLEGE CONTROLLER'S OFFICE</BusinessNameLine1Txt>
        </BusinessName>
        <PhoneNum>6036463011</PhoneNum>
        <USAddress>
          <AddressLine1Txt>7 LEBANON STREET SUITE 302</AddressLine1Txt>
          <CityNm>HANOVER</CityNm>
          <StateAbbreviationCd>NH</StateAbbreviationCd>
          <ZIPCd>03755</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <NoListedPersonsCompensatedInd>X</NoListedPersonsCompensatedInd>
      <Form990PartVIISectionAGrp>
        <PersonNm>John Thorstensen</PersonNm>
        <TitleTxt>President/Trustee</TitleTxt>
        <AverageHoursPerWeekRt>1.0</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jules Halpern</PersonNm>
        <TitleTxt>Secretary/Trustee</TitleTxt>
        <AverageHoursPerWeekRt>0.1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Christopher Miller</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>0.1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Douglas Clowe</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>0.1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Krzysztof Stanek</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>0.1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Kate Soule</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHoursPerWeekRt>0.3</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>0</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>0</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>0</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>false</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>false</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>University of Michigan</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>West Hall 1085 S University</AddressLine1Txt>
            <CityNm>Ann Arbor</CityNm>
            <StateAbbreviationCd>MI</StateAbbreviationCd>
            <ZIPCd>481091107</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Personnel Services</ServicesDesc>
        <CompensationAmt>137063</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>1</CntrctRcvdGreaterThan100KCnt>
      <TotalContributionsAmt>0</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Memberships</Desc>
        <BusinessCd>541900</BusinessCd>
        <TotalRevenueColumnAmt>504840</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>504840</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalOthProgramServiceRevGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </TotalOthProgramServiceRevGrp>
      <TotalProgramServiceRevenueAmt>504840</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>72856</TotalRevenueColumnAmt>
        <ExclusionAmt>72856</ExclusionAmt>
      </InvestmentIncomeGrp>
      <RentalIncomeOrLossGrp>
        <RealAmt>0</RealAmt>
        <PersonalAmt>0</PersonalAmt>
      </RentalIncomeOrLossGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>0</SecuritiesAmt>
        <OtherAmt>0</OtherAmt>
      </GainOrLossGrp>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </NetIncmFromFundraisingEvtGrp>
      <MiscellaneousRevenueGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </MiscellaneousRevenueGrp>
      <OtherRevenueTotalAmt>0</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>577696</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>504840</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>72856</ExclusionAmt>
      </TotalRevenueGrp>
      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <FeesForServicesOtherGrp>
        <TotalAmt>171142</TotalAmt>
        <ProgramServicesAmt>171142</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesOtherGrp>
      <OfficeExpensesGrp>
        <TotalAmt>45234</TotalAmt>
        <ProgramServicesAmt>45234</ProgramServicesAmt>
      </OfficeExpensesGrp>
      <OccupancyGrp>
        <TotalAmt>28695</TotalAmt>
        <ProgramServicesAmt>28695</ProgramServicesAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>1398</TotalAmt>
        <ProgramServicesAmt>1398</ProgramServicesAmt>
      </TravelGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>22310</TotalAmt>
        <ProgramServicesAmt>22310</ProgramServicesAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>173411</TotalAmt>
        <ProgramServicesAmt>173411</ProgramServicesAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Maintenance</Desc>
        <TotalAmt>23757</TotalAmt>
        <ProgramServicesAmt>23757</ProgramServicesAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>465947</TotalAmt>
        <ProgramServicesAmt>465947</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>5000</BOYAmt>
        <EOYAmt>5000</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>0</BOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>0</BOYAmt>
      </PledgesAndGrantsReceivableGrp>
      <AccountsReceivableGrp>
        <BOYAmt>1486763</BOYAmt>
        <EOYAmt>1620821</EOYAmt>
      </AccountsReceivableGrp>
      <ReceivablesFromOfficersEtcGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </ReceivablesFromOfficersEtcGrp>
      <RcvblFromDisqualifiedPrsnGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </RcvblFromDisqualifiedPrsnGrp>
      <OthNotesLoansReceivableNetGrp>
        <BOYAmt>0</BOYAmt>
      </OthNotesLoansReceivableNetGrp>
      <InventoriesForSaleOrUseGrp>
        <BOYAmt>0</BOYAmt>
      </InventoriesForSaleOrUseGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>0</BOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>4557690</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>4485627</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>94373</BOYAmt>
        <EOYAmt>72063</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>0</BOYAmt>
      </InvestmentsPubTradedSecGrp>
      <InvestmentsOtherSecuritiesGrp>
        <BOYAmt>0</BOYAmt>
      </InvestmentsOtherSecuritiesGrp>
      <InvestmentsProgramRelatedGrp>
        <BOYAmt>0</BOYAmt>
      </InvestmentsProgramRelatedGrp>
      <IntangibleAssetsGrp>
        <BOYAmt>0</BOYAmt>
      </IntangibleAssetsGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>1586136</BOYAmt>
        <EOYAmt>1697884</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>0</BOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <GrantsPayableGrp>
        <BOYAmt>0</BOYAmt>
      </GrantsPayableGrp>
      <DeferredRevenueGrp>
        <BOYAmt>0</BOYAmt>
      </DeferredRevenueGrp>
      <TaxExemptBondLiabilitiesGrp>
        <BOYAmt>0</BOYAmt>
      </TaxExemptBondLiabilitiesGrp>
      <EscrowAccountLiabilityGrp>
        <BOYAmt>0</BOYAmt>
      </EscrowAccountLiabilityGrp>
      <LoansFromOfficersDirectorsGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </LoansFromOfficersDirectorsGrp>
      <MortgNotesPyblScrdInvstPropGrp>
        <BOYAmt>0</BOYAmt>
      </MortgNotesPyblScrdInvstPropGrp>
      <UnsecuredNotesLoansPayableGrp>
        <BOYAmt>0</BOYAmt>
      </UnsecuredNotesLoansPayableGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </OtherLiabilitiesGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </TotalLiabilitiesGrp>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>1586136</BOYAmt>
        <EOYAmt>1697884</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>0</BOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>1586136</BOYAmt>
        <EOYAmt>1697884</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>1586136</BOYAmt>
        <EOYAmt>1697884</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>111749</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>-1</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>false</FSAuditedInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="IRS990ScheduleA" softwareId="24020961" softwareVersionNum="2024v5.1">
      <CollegeOrganizationInd>X</CollegeOrganizationInd>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>504984</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>513447</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>553860</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>587289</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>504840</CurrentTaxYearAmt>
        <TotalAmt>2664420</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TaxRevLeviedOrgnztnlBnft170Grp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
      </TaxRevLeviedOrgnztnlBnft170Grp>
      <GovtFurnSrvcFcltsVl170Grp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
      </GovtFurnSrvcFcltsVl170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>504984</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>513447</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>553860</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>587289</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>504840</CurrentTaxYearAmt>
        <TotalAmt>2664420</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>0</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>2664420</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>754</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>4604</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>53476</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>82068</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>72856</CurrentTaxYearAmt>
        <TotalAmt>213758</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <UnrelatedBusinessNetIncm170Grp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
      </UnrelatedBusinessNetIncm170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>0</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>0</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>2878178</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>0</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.92573</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.94595</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="IRS990ScheduleD" softwareId="24020961" softwareVersionNum="2024v5.1">
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>1043263</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1029029</DepreciationAmt>
        <BookValueAmt>14234</BookValueAmt>
      </BuildingsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>3514427</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>3456598</DepreciationAmt>
        <BookValueAmt>57829</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>72063</TotalBookValueLandBuildingsAmt>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020961" softwareVersionNum="2024v5.1">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6 Classes of members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>Membership of the Corporation is made up of the following: Dartmouth College (25%), The Ohio State University (25%), Columbia University (25%), University of Michigan (17%) and Ohio University (8%).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a Members or stockholders electing members of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>At the annual meeting, each member appoints one person as a trustee of the corporation. The trustee is a faculty member of the member University, appointed by a Provost, Dean or Vice President of the member University.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 8b Documentation of meetings held by committees of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization did not form any committee with the authority to act on behalf of the governing body.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 990 is prepared by personnel in the Controller's Office of Dartmouth College, one of the Corporation's member institutions. Prior to the return being filed, a draft of the completed Form 990 is sent to the Treasurer of the Corporation. The Treasurer of the Corporation meets with the Controller's Office personnel to review the draft 990, the process by which it was prepared and to discuss items of significance, and resolve any questions. Prior to filing, the 990 is sent to the full board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>Potential conflicts of interest are discussed by officers and directors prior to engaging in transactions for significant purchases of equipment or services. In addition, a report of any family or business relationships is required of all officers and directors annually. The Treasurer of the Corporation reviews all reports.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents and conflict of interest policy are available upon request from the Treasurer of the Corporation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g Other Fees</FormAndLineReferenceDesc>
        <ExplanationTxt>Personnel Services - Total Expense: 137063, Program Service Expense: 137063, Management and General Expenses: , Fundraising Expenses: ; Technical Support - Total Expense: 34079, Program Service Expense: 34079, Management and General Expenses: , Fundraising Expenses: ;</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9 Other changes in net assets or fund balances</FormAndLineReferenceDesc>
        <ExplanationTxt>ROUNDING - -1; Total - -1;</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>