﻿<?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="2024v5.2">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2025-11-14T10:56:27-06:00</ReturnTs>
    <TaxPeriodEndDt>2024-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>382706146</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>YEO &amp; YEO PC</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>710 E Milham Avenue</AddressLine1Txt>
        <CityNm>Kalamazoo</CityNm>
        <StateAbbreviationCd>MI</StateAbbreviationCd>
        <ZIPCd>490021494</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2024-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>463994587</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>Extracorporeal Life Support</BusinessNameLine1Txt>
        <BusinessNameLine2Txt>Organization</BusinessNameLine2Txt>
      </BusinessName>
      <BusinessNameControlTxt>EXTR</BusinessNameControlTxt>
      <PhoneNum>7349986601</PhoneNum>
      <USAddress>
        <AddressLine1Txt>3001 Miller Road</AddressLine1Txt>
        <CityNm>Ann Arbor</CityNm>
        <StateAbbreviationCd>MI</StateAbbreviationCd>
        <ZIPCd>48103</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Christine Stead</PersonNm>
      <PersonTitleTxt>CEO</PersonTitleTxt>
      <PhoneNum>7349986601</PhoneNum>
      <SignatureDt>2025-04-22</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>1</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>Michael E Evrard</PreparerPersonNm>
      <PTIN>P01314309</PTIN>
      <PhoneNum>2693297007</PhoneNum>
      <PreparationDt>2025-11-14</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2024</TaxYr>
    <BuildTS>2025-03-06 01:10:19Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="5">
    <IRS990 documentId="RetDoc1038000001" referenceDocumentId="RetDoc1044400001">
      <DoingBusinessAsName>
        <BusinessNameLine1Txt>ELSO</BusinessNameLine1Txt>
      </DoingBusinessAsName>
      <PrincipalOfficerNm>Christine Stead</PrincipalOfficerNm>
      <USAddress>
        <AddressLine1Txt>3001 Miller Road</AddressLine1Txt>
        <CityNm>Ann Arbor</CityNm>
        <StateAbbreviationCd>MI</StateAbbreviationCd>
        <ZIPCd>48103</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>6730832</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>0</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>WWW.ELSO.ORG</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>2014</FormationYr>
      <LegalDomicileStateCd>MI</LegalDomicileStateCd>
      <ActivityOrMissionDesc>Providing global leadership in extracorporeal life support through innovation, advocacy, and advancing knowledge.Organization's Vision: ELSO will be the premier organization for the advancement of extracorporeal life support throughout the world.</ActivityOrMissionDesc>
      <VotingMembersGoverningBodyCnt>8</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>8</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>6</TotalEmployeeCnt>
      <TotalVolunteersCnt>662</TotalVolunteersCnt>
      <TotalGrossUBIAmt>67517</TotalGrossUBIAmt>
      <NetUnrelatedBusTxblIncmAmt>0</NetUnrelatedBusTxblIncmAmt>
      <PYContributionsGrantsAmt>10004</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>1960</CYContributionsGrantsAmt>
      <PYProgramServiceRevenueAmt>4891852</PYProgramServiceRevenueAmt>
      <CYProgramServiceRevenueAmt>5568519</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>80305</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>195370</CYInvestmentIncomeAmt>
      <PYOtherRevenueAmt>277902</PYOtherRevenueAmt>
      <CYOtherRevenueAmt>224799</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>5260063</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>5990648</CYTotalRevenueAmt>
      <PYGrantsAndSimilarPaidAmt>0</PYGrantsAndSimilarPaidAmt>
      <CYGrantsAndSimilarPaidAmt>0</CYGrantsAndSimilarPaidAmt>
      <PYBenefitsPaidToMembersAmt>0</PYBenefitsPaidToMembersAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <PYSalariesCompEmpBnftPaidAmt>940319</PYSalariesCompEmpBnftPaidAmt>
      <CYSalariesCompEmpBnftPaidAmt>1022543</CYSalariesCompEmpBnftPaidAmt>
      <PYTotalProfFndrsngExpnsAmt>0</PYTotalProfFndrsngExpnsAmt>
      <CYTotalProfFndrsngExpnsAmt>0</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>0</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>3519767</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>4901200</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>4460086</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>5923743</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>799977</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>66905</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>8127178</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>8283775</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>2422639</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>2393824</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>5704539</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>5889951</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <MissionDesc>See Schedule O</MissionDesc>
      <SignificantNewProgramSrvcInd>0</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>0</SignificantChangeInd>
      <ExpenseAmt>851410</ExpenseAmt>
      <RevenueAmt>1296634</RevenueAmt>
      <Desc>Membership Registry: Center members contribute data to the ELSO Registry, which is a primary means of advancing knowledge. The Registry is an important component of ELSO's website, server environment, and security operations. Legal counsel is engaged in negotiating with centers on data use agreements. A new quality benchmarking tool was invested in to update a prior version.</Desc>
      <ProgSrvcAccomActy2Grp>
        <ExpenseAmt>1538165</ExpenseAmt>
        <RevenueAmt>1747047</RevenueAmt>
        <Desc>Education &amp; Training: ELSO offers several courses: ELSO Foundations courses - now Neo/Peds and Adult which address all patient populations. This is a virtual course available globally and priced to allow access in resource constrained countries. Group discounts are available for ECMO centers interested in education a significant portion of their team through foundations. In-person training is another means of training teams. ELSO offers courses in simulation and cannulation courses. We provide individual certification for adult practitioners; with Neo/Peds being launched soon. Certification is intended for active practitioners that have achieved ELSO's standards in didactic and simulation training and can attest to clinical hours appropriate for their role.</Desc>
      </ProgSrvcAccomActy2Grp>
      <ProgSrvcAccomActy3Grp>
        <ExpenseAmt>1349721</ExpenseAmt>
        <RevenueAmt>1828533</RevenueAmt>
        <Desc>Annual Scientific Conference: Each year, ELSO hosts a scientific conference which brings clinicians, scientists, engineers, and others together to share and advance knowledge for ECLS. Detroit, Michigan was the host site for the scientific conference, where 1,507 people attended in person and another 209 registered for the virtual conference afterward. A 35th Anniversary celebration followed in Ann Arbor, Michigan, where approximately 220 joined in person for this event. CME and equivalent were available for those that need to maintain education and training as part of their professional employment.</Desc>
      </ProgSrvcAccomActy3Grp>
      <ProgSrvcAccomActyOtherGrp>
        <ExpenseAmt>1566038</ExpenseAmt>
        <RevenueAmt>696305</RevenueAmt>
        <Desc>ELSO works with device developers, which are typically corporate members of ELSO. ELSO will provide an analysis of the performance of a specific requested device relative to the performance of similar devices such that no competitor's device performance can be made known. ELSO also composes and publishes several books, made available for purchase through ELSO's publications page on our website.</Desc>
      </ProgSrvcAccomActyOtherGrp>
      <TotalOtherProgSrvcExpenseAmt>1566038</TotalOtherProgSrvcExpenseAmt>
      <TotalOtherProgSrvcRevenueAmt>696305</TotalOtherProgSrvcRevenueAmt>
      <TotalProgramServiceExpensesAmt>5305334</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="RetDoc1039100001">1</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd>0</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd>0</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>0</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd>0</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd referenceDocumentId="RetDoc1040000001">0</DonorAdvisedFundInd>
      <ConservationEasementsInd referenceDocumentId="RetDoc1040000001">0</ConservationEasementsInd>
      <CollectionsOfArtInd referenceDocumentId="RetDoc1040000001">0</CollectionsOfArtInd>
      <CreditCounselingInd referenceDocumentId="RetDoc1040000001">0</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd>0</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd referenceDocumentId="RetDoc1040000001">1</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd referenceDocumentId="RetDoc1040000001">0</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd referenceDocumentId="RetDoc1040000001">0</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd referenceDocumentId="RetDoc1040000001">0</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd referenceDocumentId="RetDoc1040000001">1</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd referenceDocumentId="RetDoc1040000001">0</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">1</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">0</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>0</SchoolOperatingInd>
      <ForeignOfficeInd>1</ForeignOfficeInd>
      <ForeignActivitiesInd>0</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>0</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>0</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd>0</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd>0</FundraisingActivitiesInd>
      <GamingActivitiesInd>0</GamingActivitiesInd>
      <OperateHospitalInd>0</OperateHospitalInd>
      <GrantsToOrganizationsInd>0</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd>0</GrantsToIndividualsInd>
      <ScheduleJRequiredInd referenceDocumentId="RetDoc1042400001">1</ScheduleJRequiredInd>
      <TaxExemptBondsInd>0</TaxExemptBondsInd>
      <EngagedInExcessBenefitTransInd>0</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>0</PYExcessBenefitTransInd>
      <LoanOutstandingInd>0</LoanOutstandingInd>
      <GrantToRelatedPersonInd>0</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>0</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>0</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>0</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>0</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>0</DeductibleArtContributionInd>
      <TerminateOperationsInd>0</TerminateOperationsInd>
      <PartialLiquidationInd>0</PartialLiquidationInd>
      <DisregardedEntityInd>0</DisregardedEntityInd>
      <RelatedEntityInd>0</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>0</RelatedOrganizationCtrlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>0</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd>0</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>1</ScheduleORequiredInd>
      <IRPDocumentCnt>70</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <EmployeeCnt>6</EmployeeCnt>
      <EmploymentTaxReturnsFiledInd>1</EmploymentTaxReturnsFiledInd>
      <UnrelatedBusIncmOverLimitInd>0</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>0</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>0</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>0</NondeductibleContributionsInd>
      <QuidProQuoContributionsInd>0</QuidProQuoContributionsInd>
      <Form8282PropertyDisposedOfInd>0</Form8282PropertyDisposedOfInd>
      <RcvFndsToPayPrsnlBnftCntrctInd>0</RcvFndsToPayPrsnlBnftCntrctInd>
      <PayPremiumsPrsnlBnftCntrctInd>0</PayPremiumsPrsnlBnftCntrctInd>
      <Form8899Filedind>0</Form8899Filedind>
      <Form1098CFiledInd>0</Form1098CFiledInd>
      <IndoorTanningServicesInd>0</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>0</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>0</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>8</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>8</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>0</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>0</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>0</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>0</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>1</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>1</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>0</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>1</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>1</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>0</OfficerMailingAddressInd>
      <LocalChaptersInd>1</LocalChaptersInd>
      <PoliciesReferenceChaptersInd>1</PoliciesReferenceChaptersInd>
      <Form990ProvidedToGvrnBodyInd>1</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>1</ConflictOfInterestPolicyInd>
      <AnnualDisclosureCoveredPrsnInd>1</AnnualDisclosureCoveredPrsnInd>
      <RegularMonitoringEnfrcInd>1</RegularMonitoringEnfrcInd>
      <WhistleblowerPolicyInd>1</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>1</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>1</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>0</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>0</InvestmentInJointVentureInd>
      <StatesWhereCopyOfReturnIsFldCd>MI</StatesWhereCopyOfReturnIsFldCd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <BusinessName>
          <BusinessNameLine1Txt>Christine Stead</BusinessNameLine1Txt>
        </BusinessName>
        <PhoneNum>7342932101</PhoneNum>
        <USAddress>
          <AddressLine1Txt>3001 Miller Road</AddressLine1Txt>
          <CityNm>ANN ARBOR</CityNm>
          <StateAbbreviationCd>MI</StateAbbreviationCd>
          <ZIPCd>48103</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <Form990PartVIISectionAGrp>
        <PersonNm>Matthew Paden MD</PersonNm>
        <TitleTxt>Past-President</TitleTxt>
        <AverageHoursPerWeekRt>4.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Daniel Brodie</PersonNm>
        <TitleTxt>President-Elect</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Peta Alexander</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHoursPerWeekRt>3.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jay Shiland JD</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Elizabeth Maringer JD</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Graeme MacLaren MD</PersonNm>
        <TitleTxt>President</TitleTxt>
        <AverageHoursPerWeekRt>8.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Robert H Bartlett MD</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Thomas Mueller</PersonNm>
        <TitleTxt>Global Rep.</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Christine Stead</PersonNm>
        <TitleTxt>CEO</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>298906</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>28350</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Peter Rycus</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>242206</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>22680</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Alex Fox</PersonNm>
        <TitleTxt>Senior Project Manager</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>106078</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>22031</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>647190</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>73061</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>3</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>IGD Solutions</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>6521 Citation Drive Suite 200</AddressLine1Txt>
            <CityNm>Clarkston</CityNm>
            <StateAbbreviationCd>MI</StateAbbreviationCd>
            <ZIPCd>48346</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Professional</ServicesDesc>
        <CompensationAmt>503352</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>SweetRush Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1728 Ocean Ave 366</AddressLine1Txt>
            <CityNm>San Francisco</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>94112</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Custom E-learn</ServicesDesc>
        <CompensationAmt>409380</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Sodexo Live</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1 Washington Blvd</AddressLine1Txt>
            <CityNm>Detroit</CityNm>
            <StateAbbreviationCd>MI</StateAbbreviationCd>
            <ZIPCd>48226</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Conference Services</ServicesDesc>
        <CompensationAmt>250000</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Regents of The University of MI</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1000 Victors Way Suite 1A</AddressLine1Txt>
            <CityNm>Ann Arbor</CityNm>
            <StateAbbreviationCd>MI</StateAbbreviationCd>
            <ZIPCd>48108</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Statistics Services</ServicesDesc>
        <CompensationAmt>218425</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Burwood Group Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>8582 Solutions Ctr</AddressLine1Txt>
            <CityNm>Chicago</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60677</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Software and website development</ServicesDesc>
        <CompensationAmt>115743</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>7</CntrctRcvdGreaterThan100KCnt>
      <AllOtherContributionsAmt>1960</AllOtherContributionsAmt>
      <TotalContributionsAmt>1960</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Annual Conference</Desc>
        <BusinessCd>611430</BusinessCd>
        <TotalRevenueColumnAmt>1828533</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1828533</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Educational Courses</Desc>
        <BusinessCd>611430</BusinessCd>
        <TotalRevenueColumnAmt>1747047</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1747047</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Membership Dues</Desc>
        <BusinessCd>518210</BusinessCd>
        <TotalRevenueColumnAmt>1296634</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1296634</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Data Requests Income</Desc>
        <BusinessCd>611430</BusinessCd>
        <TotalRevenueColumnAmt>383225</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>383225</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Award of Excellence</Desc>
        <BusinessCd>611430</BusinessCd>
        <TotalRevenueColumnAmt>313080</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>313080</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>5568519</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>127853</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>127853</RelatedOrExemptFuncIncomeAmt>
      </InvestmentIncomeGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>740988</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>673471</SecuritiesAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>67517</SecuritiesAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>67517</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>67517</UnrelatedBusinessRevenueAmt>
      </NetGainOrLossInvestmentsGrp>
      <GrossSalesOfInventoryAmt>291483</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>66713</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>224770</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>224770</RelatedOrExemptFuncIncomeAmt>
      </NetIncomeOrLossGrp>
      <OtherRevenueMiscGrp>
        <Desc>Pass-Through Revenues</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>29</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>29</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>29</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>5990648</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>5921171</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>67517</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </TotalRevenueGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>592142</TotalAmt>
        <ProgramServicesAmt>503321</ProgramServicesAmt>
        <ManagementAndGeneralAmt>88821</ManagementAndGeneralAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>267382</TotalAmt>
        <ProgramServicesAmt>259690</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7692</ManagementAndGeneralAmt>
      </OtherSalariesAndWagesGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>137376</TotalAmt>
        <ProgramServicesAmt>137376</ProgramServicesAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>25643</TotalAmt>
        <ProgramServicesAmt>17655</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7988</ManagementAndGeneralAmt>
      </PayrollTaxesGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>120033</TotalAmt>
        <ManagementAndGeneralAmt>120033</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>20239</TotalAmt>
        <ProgramServicesAmt>20239</ProgramServicesAmt>
      </FeesForSrvcInvstMgmntFeesGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>587813</TotalAmt>
        <ProgramServicesAmt>545102</ProgramServicesAmt>
        <ManagementAndGeneralAmt>42711</ManagementAndGeneralAmt>
      </FeesForServicesOtherGrp>
      <AdvertisingGrp>
        <TotalAmt>43693</TotalAmt>
        <ProgramServicesAmt>41508</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2185</ManagementAndGeneralAmt>
      </AdvertisingGrp>
      <InformationTechnologyGrp>
        <TotalAmt>1754181</TotalAmt>
        <ProgramServicesAmt>1666472</ProgramServicesAmt>
        <ManagementAndGeneralAmt>87709</ManagementAndGeneralAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>213500</TotalAmt>
        <ProgramServicesAmt>181475</ProgramServicesAmt>
        <ManagementAndGeneralAmt>32025</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>464125</TotalAmt>
        <ProgramServicesAmt>440919</ProgramServicesAmt>
        <ManagementAndGeneralAmt>23206</ManagementAndGeneralAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>1153823</TotalAmt>
        <ProgramServicesAmt>1096132</ProgramServicesAmt>
        <ManagementAndGeneralAmt>57691</ManagementAndGeneralAmt>
      </ConferencesMeetingsGrp>
      <PaymentsToAffiliatesGrp>
        <TotalAmt>90169</TotalAmt>
        <ProgramServicesAmt>85661</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4508</ManagementAndGeneralAmt>
      </PaymentsToAffiliatesGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>49680</TotalAmt>
        <ProgramServicesAmt>42228</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7452</ManagementAndGeneralAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>15786</TotalAmt>
        <ManagementAndGeneralAmt>15786</ManagementAndGeneralAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Other</Desc>
        <TotalAmt>138003</TotalAmt>
        <ProgramServicesAmt>122768</ProgramServicesAmt>
        <ManagementAndGeneralAmt>15235</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>ECMOnet</Desc>
        <TotalAmt>110253</TotalAmt>
        <ProgramServicesAmt>104740</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5513</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Bank Processing Fees</Desc>
        <TotalAmt>97746</TotalAmt>
        <ManagementAndGeneralAmt>97746</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Program Supplies and CM</Desc>
        <TotalAmt>42156</TotalAmt>
        <ProgramServicesAmt>40048</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2108</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>5923743</TotalAmt>
        <ProgramServicesAmt>5305334</ProgramServicesAmt>
        <ManagementAndGeneralAmt>618409</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>2518007</BOYAmt>
        <EOYAmt>2856127</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>191253</BOYAmt>
        <EOYAmt>178932</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <AccountsReceivableGrp>
        <BOYAmt>106962</BOYAmt>
        <EOYAmt>191747</EOYAmt>
      </AccountsReceivableGrp>
      <InventoriesForSaleOrUseGrp>
        <BOYAmt>42128</BOYAmt>
        <EOYAmt>59211</EOYAmt>
      </InventoriesForSaleOrUseGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>192541</BOYAmt>
        <EOYAmt>52815</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>434015</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>126643</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>357052</BOYAmt>
        <EOYAmt>307372</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>3307195</BOYAmt>
        <EOYAmt>3612710</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <IntangibleAssetsGrp>
        <BOYAmt>978514</BOYAmt>
        <EOYAmt>878562</EOYAmt>
      </IntangibleAssetsGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>433526</BOYAmt>
        <EOYAmt>146299</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>8127178</BOYAmt>
        <EOYAmt>8283775</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>415889</BOYAmt>
        <EOYAmt>401303</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <GrantsPayableGrp>
        <BOYAmt>70000</BOYAmt>
        <EOYAmt>70000</EOYAmt>
      </GrantsPayableGrp>
      <DeferredRevenueGrp>
        <BOYAmt>891975</BOYAmt>
        <EOYAmt>972863</EOYAmt>
      </DeferredRevenueGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>1044775</BOYAmt>
        <EOYAmt>949658</EOYAmt>
      </OtherLiabilitiesGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>2422639</BOYAmt>
        <EOYAmt>2393824</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>5687884</BOYAmt>
        <EOYAmt>5873296</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>16655</BOYAmt>
        <EOYAmt>16655</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>5704539</BOYAmt>
        <EOYAmt>5889951</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>8127178</BOYAmt>
        <EOYAmt>8283775</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>66905</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>118507</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus4YearsAmt>1025</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>5190</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>6343</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>10004</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1960</CurrentTaxYearAmt>
        <TotalAmt>24522</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <GrossReceiptsAdmissionsGrp>
        <CurrentTaxYearMinus4YearsAmt>2605743</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>3072918</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4555801</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5293389</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5860002</CurrentTaxYearAmt>
        <TotalAmt>21387853</TotalAmt>
      </GrossReceiptsAdmissionsGrp>
      <GrossReceiptsNonUnrltBusGrp>
        <CurrentTaxYearMinus4YearsAmt>26694</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>56567</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>20833</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>10084</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>29</CurrentTaxYearAmt>
        <TotalAmt>114207</TotalAmt>
      </GrossReceiptsNonUnrltBusGrp>
      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>2633462</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>3134675</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4582977</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5313477</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5861991</CurrentTaxYearAmt>
        <TotalAmt>21526582</TotalAmt>
      </Total509Grp>
      <AmountsRcvdDsqlfyPersonGrp>
        <CurrentTaxYearMinus4YearsAmt>1000</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus1YearAmt>10000</CurrentTaxYearMinus1YearAmt>
        <TotalAmt>11000</TotalAmt>
      </AmountsRcvdDsqlfyPersonGrp>
      <SubstantialContributorsAmtGrp>
        <TotalAmt>0</TotalAmt>
      </SubstantialContributorsAmtGrp>
      <SubstAndDsqlfyPrsnsTotGrp>
        <CurrentTaxYearMinus4YearsAmt>1000</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus1YearAmt>10000</CurrentTaxYearMinus1YearAmt>
        <TotalAmt>11000</TotalAmt>
      </SubstAndDsqlfyPrsnsTotGrp>
      <PublicSupportTotal509Amt>21515582</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
        <CurrentTaxYearMinus4YearsAmt>59062</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>65207</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>89835</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>115839</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>127853</CurrentTaxYearAmt>
        <TotalAmt>457796</TotalAmt>
      </GrossInvestmentIncome509Grp>
      <InvestmentIncomeAndUBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>59062</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>65207</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>89835</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>115839</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>127853</CurrentTaxYearAmt>
        <TotalAmt>457796</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
      <NetIncomeFromOtherUBIGrp>
        <CurrentTaxYearMinus4YearsAmt>17130</CurrentTaxYearMinus4YearsAmt>
        <TotalAmt>17130</TotalAmt>
      </NetIncomeFromOtherUBIGrp>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>2709654</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>3199882</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4672812</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5429316</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5989844</CurrentTaxYearAmt>
        <TotalAmt>22001508</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.97790</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.97950</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.02080</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.02000</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>434015</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>126643</DepreciationAmt>
        <BookValueAmt>307372</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <TotalBookValueLandBuildingsAmt>307372</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Operating Lease Obligation</Desc>
        <Amt>949658</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>949658</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>6155629</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>118507</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>66713</OtherRevenueAmt>
      <RevenueNotReportedAmt>185220</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>5970409</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>20239</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>20239</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>5990648</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>5970217</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>66713</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>66713</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>5903504</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>20239</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>20239</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>5923743</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Cost of Goods Sold 66,713.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Cost of Goods Sold 66,713.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>1</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Christine Stead</PersonNm>
        <TitleTxt>CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>287906</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>11000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28350</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>327256</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Peter Rycus</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>231206</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>11000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>22680</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>264886</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>Bonuses are paid based on merit/performance of the individual</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ELSO Member Centers (hospitals and hospital systems) that pay their annual membership dues and contribute data to the ELSO Registry are considered active center members. Individual members of ELSO are physicians and nonphysicians that pay annual member dues.Corporate members are those that pay an annual corporate membership fee. Center membership dues differ depending on the location of the center. ELSO uses the World Bank Organization's resource categorization of countries to apply discounted rates that reflect more constrained resource countries. ELSO is a directorship governance model. The Board of Directors governs the organization, with its roles and responsibilities granted under the State of Michigan for non-profit organizations. ELSO maintains our bylaws on our website and reports changes to the Attorney General of the State of Michigan, as required by state law. A Steering Committee serves as an advisor to the Board. The Steering Committee includes our global Chapter Chairs, standing committee chairs, and several liaisons to specialty clinical professional.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Officers of the Board are appointed by the Board as term limits require, which are published in ELSO's bylaws, available and maintained here: https://www.elso.org/aboutus/by-laws.aspx. Majority votes for officers are required for a successful election. Steering Committee members are nominated by any active member center. Eligibility criteria and term limits are found in ELSO's bylaws. Steering Committee members vote for its new members after the Nominations &amp; Membership Committee has prepared a candidate list from the nominated candidates. The Steering Committee ratifies its vote conducted by confidential electronic ballot. The SC election results are finalized by the Board of Directors, where they can ratify the election results or make a change. Majority vote of the Board is required for a successful election.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE BOARD OF DIRECTORS. ONCE THE BOARD APPROVES THE FORM 990 IS SIGNED AND SUBMITTED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>IN THE EVENT THAT THE BOARD SHOULD ESTABLISH THAT A PROPOSED TRANSACTION OR ARRANGEMENT ESTABLISHES A CONFLICT OF INTEREST, THE BOARD SHALL THEN PROCEED WITH THE FOLLOWING ACTIONS: A)ANY INTERESTED INDIVIDUAL MAY RENDER A REQUEST OR REPORT AT THE BOARD MEETING, BUT UPON COMPLETION OF SAID REQUEST OR REPORT THE INDIVIDUAL SHALL BE EXCUSED WHILE THE BOARD DISCUSSES THE INFORMATION AND/OR MATERIAL PRESENTED, AND THEN VOTES ON THE TRANSACTION OR ARRANGEMENT PROPOSED INVOLVING THE POSSIBLE CONFLICT OF INTEREST. B)THE CHAIRPERSON OF THE BOARD SHALL, IF DEEMED NECESSARY AND APPROPRIATE, APPOINT A DISINTERESTED PERSON OR COMMITTEE TO INVESTIGATE ALTERNATIVES TO THE PROPOSED TRANSACTION OR ARRANGEMENT. C)AFTER EXERCISING DUE DILIGENCE, THE BOARD SHALL DETERMINE WHETHER ELSO CAN OBTAIN WILL REASONABLE EFFORTS A MORE ADVANTAGEOUS TRANSACTION OR ARRANGEMENT FROM A PERSON OR ENTITY THAT WOULD NOT GIVE RISE TO A CONFLICT OF INTEREST. D)IF A MORE ADVANTAGEOUS TRANSACTION OR ARRANGEMENT IS NOT REASONABLY POSSIBLE UNDER CIRCUMSTANCES NOT PRODUCING A CONFLICT OF INTEREST, THE BOARD SHALL DETERMINE BY A MAJORITY VOTE OF THE DISINTERESTED DIRECTORS WHETHER THE TRANSACTION OR ARRANGEMENT IS IN ELSO'S BEST INTEREST, FOR ITS OWN BENEFIT, AND WHETHER IT IS FAIR AND REASONABLE. IT SHALL MAKE ITS DECISION AS TO WHETHER TO ENTER INTO THE TRANSACTION ARRANGEMENT IN CONFORMITY WITH THIS DETERMINATION. SHOULD THE BOARD HAVE REASONABLE CAUSE TO BELIEVE AN INTERESTED PERSON HAS FAILED TO DISCLOSE ACTUAL OR POSSIBLE CONFLICTS OF INTEREST, THE BOARD SHALL THEN INFORM THE INTERESTED PERSON OF THE BASIS FOR SUCH BELIEF AND AFFORD THE INTERESTED PERSON AN OPPORTUNITY TO EXPLAIN THE ALLEGED FAILURE TO DISCLOSE. IF, AFTER HEARING THE INTERESTED PERSON'S EXPLANATION AND AFTER MAKING FURTHER INVESTIGATION AS MAY BE WARRANTED IN CONSIDERATION OF THE CIRCUMSTANCES, THE BOARD DETERMINES THE INTERESTED PERSON INTENTIONALLY FAILED TO DISCLOSE AN ACTUAL OR POSSIBLE CONFLICT OF INTEREST, IT SHALL TAKE APPROPRIATE DISCIPLINARY AND CORRECTIVE ACTION. ALL MINUTES OF THE BOARD MEETINGS, WHEN APPLICABLE, SHALL CONTAIN THE FOLLOWING INFORMATION: A)THE NAMES OF ALL THE PERSONS WHO DISCLOSED OR OTHERWISE WERE FOUND TO HAVE A FINANCIAL INTEREST IN CONNECTION WITH AN ACTUAL OR POSSIBLE CONFLICT OF INTEREST, THE NATURE OF THE FINANCIAL INTEREST, ANY ACTION TAKEN TO DETERMINE WHETHER A CONFLICT OF INTEREST WAS PRESENT, AND THE BOARD'S DECISION AS TO WHETHER A CONFLICT OF INTEREST IN FACT EXISTED. B)THE NAMES OF THE PERSONS WHO WERE PRESENT FOR DISCUSSIONS AND VOTES RELATING TO THE TRANSACTION OR ARRANGEMENT, THE CONTENT OF THE DISCUSSIONS, INCLUDING ANY ALTERNATIVES TO THE PROPOSED TRANSACTION OR ARRANGEMENT, AND A RECORD OF ANY VOTES TAKEN IN CONNECTION WITH THE PROCEEDINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>IN DETERMINING THE COMPENSATION OF TOP OFFICIALS, FIRST A MARKET RESEARCH IS CONDUCTED FOR COMPARABLE SALARIES. THE RESULTS OF THE MARKET RESEARCH ARE REVIEWED BY THE STEERING COMMITTEE WHICH THEN MAKES A RECOMMENDATION FOR COMPENSATION TO THE BOARD FOR APPROVAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ELSO SHALL KEEP AT ITS PRINCIPAL OFFICE A COPY OF ITS FEDERAL TAX EXEMPTION APPLICATION AND ITS ANNUAL INFORMATION RETURNS FOR THREE YEARS FROM THEIR DATE OF FILING, WHICH SHALL BE OPEN TO PUBLIC INSPECTION AND COPYING TO THE EXTENT REQUIRED BY LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4b, Other Program Services:</FormAndLineReferenceDesc>
        <ExplanationTxt>EDUCATION AND TRAINING: ELSO INCREASED OUR OFFERINGS OF IN-PERSON TRAINING FOR SIMULATION AND CANNULATION COURSES IN 2024, NOTING HIGH DEMAND FOR BOTH IN 2023. IN-PERSON COURSES BEGAN IN JANUARY AT THE SOCIETY FOR CRITICAL CARE MEDICINE (SCCM) CONFERENCE IN PHOENIX, ARIZONA, WHERE 60+ LEARNERS WERE TRAINED IN ECLS SIMULATION, WHICH ALSO QUALIFIES AS A STEP 2 CRITERIA FOR THE ADULT CERTIFICATION EXAM (EAEC). SIMULATION AND CANNULATION COURSES WERE HELD IN APRIL, JUNE, SEPTEMBER, AND NOVEMBER. THIS WAS THE FIRST YEAR THAT A NEO/PEDS SIMULATION COURSE WAS HELD, WHICH WE EXPECT TO GROW NEXT YEAR WITH THE RELEASE OF THE REST OF THE NEO/PEDS COURSES. THIS WAS ALSO THE FIRST TIME THAT ELSO HELD ADULT SIMULATION COURSES IN CONCERT WITH OUR ANNUAL CONFERENCE. DEMAND IS GROWING FOR ELSO. FOUNDATIONS A VIRTUAL TRAINING PROGRAM FOR ADULT PRACTITIONERS. DEMAND IS ALSO GROWING FOR THE CERTIFICATION EXAM: E-AEC, ALSO A VIRTUAL COURSE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4c, Other Program Services:</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUAL CONFERENCE: SEATTLE, WASHINGTON WAS THE LOCATION OF THIS YEAR'S CONFERENCE, WHICH SET A NEW ATTENDANCE RECORD FOR ELSO AT 1,509 IN PERSON ATTENDEES. SPONSORSHIP FROM INDUSTRY WAS ALSO AT A RECORD HIGH. WE HAD THE MOST SPEAKERS WE HAVE EVER INVITED, WHICH CONTINUES TO FOSTER THE NEXT GENERATION OF SCIENTIFIC LEADERSHIP, ALONG WITH MORE DIVERSITY. THIS WAS THE FIRST YEAR ELSO INVITED ISHLT TO JOINTLY DEVELOP WHAT BECAME TWO BREAKOUT SESSIONS ON TRANSPLANT RELATED CONTENT. THE TEAMS DID A WONDERFUL JOB PLANNING THIS TOGETHER AND THERE WAS A LOT OF ENTHUSIASM FOR THE PARTNERSHIP. THE CONFERENCE FEATURED A MOUNTAIN HIKER RESCUE AND HIS CHAIN OF SURVIVAL TEAM AS OUR OPENING SESSION A TEAM BASED IN SEATTLE, WHICH INCLUDED THE US NAVY. IT'S A REMARKABLE STORY THAT TIED IN MUCH WORK IN OUR FIELD FOR ECPR AND OTHER OUT OF HOSPITAL SYSTEMS THAT NEED TO COME TOGETHER TO ACHIEVE BETTER PATIENT OUTCOMES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>