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        <PersonNm>MICHAEL H SCHILL</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <PersonNm>JEFFREY A SINE</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <PersonNm>STEPHEN M STIGLER</PersonNm>
        <TitleTxt>TRUSTEE (to 3/21/18)</TitleTxt>
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        <PersonNm>HERBERT S WINOKUR JR</PersonNm>
        <TitleTxt>trustee</TitleTxt>
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        <PersonNm>LAURA BROWN</PersonNm>
        <TitleTxt>EVP, JSTOR MANAGING DIRECTOR</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NANCY KOPANS</PersonNm>
        <TitleTxt>VP, GENERAL COUNSEL/SECRETARY</TitleTxt>
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        <PersonNm>CATHARINE BOND HILL</PersonNm>
        <TitleTxt>MANAGING DIRECTOR, ITHAK S+R</TitleTxt>
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        <PersonNm>GERARD AURIGEMMA</PersonNm>
        <TitleTxt>CFO AND TREASURER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KATE WITTENBERG</PersonNm>
        <TitleTxt>MANAGING DIRECTOR, PORTICO</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ROBERT HETERICK</PersonNm>
        <TitleTxt>VP INSTITUTIONAL PARTICIPATION</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RAHUL BELANI</PersonNm>
        <TitleTxt>EVP CONTENT AND TECHNOLOGY</TitleTxt>
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        <PersonNm>WILLIAM YING</PersonNm>
        <TitleTxt>CIO &amp; VP OF TECHNOLOGY</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN LENAHAN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>FRANK SMITH</PersonNm>
        <TitleTxt>DIRECTOR, BOOKS AT JSTOR</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DALE MYERS</PersonNm>
        <TitleTxt>VP PLATFORM ENGINEERING &amp; OPS</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JABIN WHITE</PersonNm>
        <TitleTxt>VP, CONTENT MANAGEMENT</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>PIOTR ADAMCZYK</PersonNm>
        <TitleTxt>DIR, ARTSTOR DIGITAL LIBRARY</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CHRIS VANACORE</PersonNm>
        <TitleTxt>CONTROLLER</TitleTxt>
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        <PersonNm>HEIDI BARTOLACCI</PersonNm>
        <TitleTxt>VP, MARKETING &amp; COMMUNICATIONS</TitleTxt>
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        <PersonNm>MATT S MACQUEEN</PersonNm>
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        <PersonNm>WILLIAM F GROPPE</PersonNm>
        <TitleTxt>SR. SOFTWARE ENGINEER</TitleTxt>
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        <PersonNm>ALEX HUMPHREYS</PersonNm>
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        <PersonNm>HEATHER JENSEN</PersonNm>
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        <PersonNm>ARCHIBALD COWAN</PersonNm>
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        <PersonNm>MARTIN KURZWEIL</PersonNm>
        <TitleTxt>PROGRAM DIRECTOR ITHAKA S+R</TitleTxt>
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          <PersonNm>PRODUCT OPS</PersonNm>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>DOCMATION LLC</PersonNm>
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          <USAddress>
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      <ContractorCompensationGrp>
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          <PersonNm>TEK SYSTEMS</PersonNm>
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          <PersonNm>EIT PROFESSIONALS CORP</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART X, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>ITHAKA is subject to the provisions of the Financial Accounting Standards Board's ("FASB") Accounting Standards Codification ("ASC") Topic 740, Income Taxes, relating to accounting and reporting for uncertainty in income taxes. Ithaka Harbors, Inc. is subject to potential unrelated business income tax (UBIT) related to its shared services revenue and disallowed transit and parking fringe benefits. Because of ITHAKA's general tax-exempt status, management believes ASC Topic 740 has not had, and is not expected to have, a material impact on ITHAKA's consolidated financial statements.</ExplanationTxt>
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      <InterestInForeignTrustInd>false</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>false</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>false</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>false</ForeignPartnershipInd>
      <BoycottCountriesInd>false</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE F, PART I, LINE 3, COLUMN F</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTING METHOD IS ACCRUAL BASIS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleF>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ">
      <IdemnificationGrossUpPmtsInd>X</IdemnificationGrossUpPmtsInd>
      <WrittenPolicyRefTAndEExpnssInd>true</WrittenPolicyRefTAndEExpnssInd>
      <SubstantiationRequiredInd>true</SubstantiationRequiredInd>
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>true</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>true</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KEVIN M GUTHRIE</PersonNm>
        <TitleTxt>PRESIDENT AND TRUSTEE</TitleTxt>
        <BaseCompensationFilingOrgAmt>543780</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>5000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>33000</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>23168</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>604948</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LAURA BROWN</PersonNm>
        <TitleTxt>EVP, JSTOR MANAGING DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>387992</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>33000</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>15790</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>436782</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>NANCY KOPANS</PersonNm>
        <TitleTxt>VP, GENERAL COUNSEL/SECRETARY</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7500</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>33000</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>14298</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>361059</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>CATHARINE BOND HILL</PersonNm>
        <TitleTxt>MANAGING DIRECTOR, ITHAK S+R</TitleTxt>
        <BaseCompensationFilingOrgAmt>289070</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>33000</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>15790</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>337860</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>GERARD AURIGEMMA</PersonNm>
        <TitleTxt>CFO AND TREASURER</TitleTxt>
        <BaseCompensationFilingOrgAmt>272718</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>33000</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>23168</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>328886</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KATE WITTENBERG</PersonNm>
        <TitleTxt>MANAGING DIRECTOR, PORTICO</TitleTxt>
        <BaseCompensationFilingOrgAmt>243056</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>5000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>28984</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>299388</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ROBERT HETERICK</PersonNm>
        <TitleTxt>VP INSTITUTIONAL PARTICIPATION</TitleTxt>
        <BaseCompensationFilingOrgAmt>240590</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>81843</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>58876</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>29563</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>23168</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>434040</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>RAHUL BELANI</PersonNm>
        <TitleTxt>EVP CONTENT AND TECHNOLOGY</TitleTxt>
        <BaseCompensationFilingOrgAmt>291747</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>5000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>54712</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>33000</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>406807</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>WILLIAM YING</PersonNm>
        <TitleTxt>CIO &amp; VP OF TECHNOLOGY</TitleTxt>
        <BaseCompensationFilingOrgAmt>293757</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>15</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>33000</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>1783</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>328555</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOHN LENAHAN</PersonNm>
        <TitleTxt>ASSOC. VP INST'L PARTICIPATION</TitleTxt>
        <BaseCompensationFilingOrgAmt>217319</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>81843</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>26042</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>347552</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>FRANK SMITH</PersonNm>
        <TitleTxt>DIRECTOR, BOOKS AT JSTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>261812</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>31217</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>315377</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DALE MYERS</PersonNm>
        <TitleTxt>VP PLATFORM ENGINEERING &amp; OPS</TitleTxt>
        <BaseCompensationFilingOrgAmt>254486</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>30723</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>15790</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>300999</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JABIN WHITE</PersonNm>
        <TitleTxt>VP, CONTENT MANAGEMENT</TitleTxt>
        <BaseCompensationFilingOrgAmt>238950</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>5000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>26</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>28611</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>294935</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>PIOTR ADAMCZYK</PersonNm>
        <TitleTxt>DIR, ARTSTOR DIGITAL LIBRARY</TitleTxt>
        <BaseCompensationFilingOrgAmt>190614</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>22915</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>7412</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>220941</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>CHRIS VANACORE</PersonNm>
        <TitleTxt>CONTROLLER</TitleTxt>
        <BaseCompensationFilingOrgAmt>182383</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>22194</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>23168</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>227745</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>HEIDI BARTOLACCI</PersonNm>
        <TitleTxt>VP, MARKETING &amp; COMMUNICATIONS</TitleTxt>
        <BaseCompensationFilingOrgAmt>185958</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>2000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>22429</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>232735</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MATT S MACQUEEN</PersonNm>
        <TitleTxt>VP PRODUCT DESIGN/USER EXPER</TitleTxt>
        <BaseCompensationFilingOrgAmt>214348</BaseCompensationFilingOrgAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>26170</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>20272</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>260790</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>WILLIAM F GROPPE</PersonNm>
        <TitleTxt>SR. SOFTWARE ENGINEER</TitleTxt>
        <BaseCompensationFilingOrgAmt>214945</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>135</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>25739</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>263167</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ALEX HUMPHREYS</PersonNm>
        <TitleTxt>ASSOC VP JSTOR LABS</TitleTxt>
        <BaseCompensationFilingOrgAmt>205972</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>5000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>25554</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>23168</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>259694</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>HEATHER JENSEN</PersonNm>
        <TitleTxt>DEPUTY GENERAL COUNSEL</TitleTxt>
        <BaseCompensationFilingOrgAmt>192207</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>10000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>162</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>23209</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>7345</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>232923</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ARCHIBALD COWAN</PersonNm>
        <TitleTxt>CHIEF ARCHITECT</TitleTxt>
        <BaseCompensationFilingOrgAmt>189717</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>3000</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>138</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>23620</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>23168</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>239643</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MARTIN KURZWEIL</PersonNm>
        <TitleTxt>PROGRAM DIRECTOR ITHAKA S+R</TitleTxt>
        <BaseCompensationFilingOrgAmt>190938</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>23629</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>22348</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>236915</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, SCHEDULE J, PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>ITHAKA PROVIDED A GROSS-UP PAYMENT TO TWO KEY EMPLOYEES FOR COMPENSATION THEY RECEIVED IN ACCORDANCE WITH AN APPROVED REIMBURSEMENT AGREEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, SCHEDULE J, PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>ITHAKA harbors, inc. MAINTAINS A 457(B) DEFERRED-COMPENSATION PLAN FOR ELIGIBLE EMPLOYEES, AS DESIGNATED AND APPROVED BY ITHAKA harbors inc.'s BOARD OF TRUSTEES. UNDER THE TERMS OF THIS PLAN, ELIGIBLE EMPLOYEES MAY MAKE ELECTIVE DEFERRALS UP TO THE MAXIMUM AMOUNT PERMITTED BY LAW. ITHAKA harbors, inc. DOES NOT CONTRIBUTE TO THIS PLAN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, SCHEDULE J, PART I, LINE 5A</FormAndLineReferenceDesc>
        <ExplanationTxt>IN ACCORDANCE WITH THEIR APPROVED COMPENSATION PLANS, ITHAKA PROVIDED CONTINGENT PAYMENTS TO TWO KEY EMPLOYEES BASED ON REVENUE EARNED THROUGH THE ACQUISITION OF NEW JSTOR PARTICIPANTS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The respective Boards of Trustees of Artstor INC. ("ARTSTOR") and ITHAKA HARBORS, INC. ("ITHAKA") agreed to a strategic alliance that provided a change in the governing structure of Artstor. In January 2016, Artstor amended its governing documents whereby ITHAKA became its sole corporate member, with Ithaka having the full power and authority to manage the administrative and financial operations of Artstor as well as the authority to appoint the Board of Trustees and officers of Artstor. Under the alliance, Artstor continued to remain its own legal entity and operate contractually with key legacy vendors for office space, assets purchased, leased equipment, etc. In order to provide a more integrated approach to support the activities of Artstor, effective January 1, 2017 (i) all employees of Artstor were transitioned to ITHAKA, (ii) the Artstor Retirement Plan was merged with the ITHAKA 403(b) Retirement Plan, and (iii) the Section 457(b) deferred-compensation plan for eligible employees was subsumed by ITHAKA. In October 2018, ITHAKAs Board of trustees elected to merge Artstor with and into ITHAKA effective December 31, 2018. SEE ALSO FORM 990, SCHEDULE R FOR FURTHER DETAILS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>JSTOR GENERATES INCOME TO SUPPORT ITS SERVICES PRIMARILY THROUGH AN ARCHIVE CAPITAL FEE ("ACF") AND ANNUAL ACCESS FEES ("AAF"). AN ACF IS A ONE-TIME, NON-REFUNDABLE FEE THAT PROVIDES FOR LONG-TERM PRESERVATION OF THE ARCHIVE AND OTHER MISSION-RELATED PURPOSES. AAF'S ARE CHARGED TO PARTICIPATING INSTITUTIONS TO COVER THE RECURRING COSTS OF UPDATING, MAINTAINING, AND PROVIDING ACCESS TO THE JSTOR ARCHIVES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE AUDIT AND RISK MANAGEMENT COMMITTEE AND IT APPROVES RELEASE TO THE ENTIRE BOARD FOR AN OPPORTUNITY TO REVIEW PRIOR TO THE ELECTRONIC FILING OF THE FORM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ITHAKA'S CONFLICTS OF INTEREST POLICY APPLIES TO ITS GOVERNING BOARD, CORPORATE OFFICERS, KEY EMPLOYEES, AND OTHERS REPRESENTING THE ORGANIZATION. MEMBERS OF ITHAKA'S GOVERNING BOARD ARE REQUIRED TO DISCLOSE ALL CONFLICTS OF INTEREST AT THE TIME THEY ARISE AND ANNUALLY VIA A WRITTEN DISCLOSURE PROCESS. THE AUDIT COMMITTEE IS CHARGED WITH REVIEWING CONFLICTS OF INTEREST TRANSACTIONS AND ASSOCIATED DECISIONS AND MAKING A DETERMINATION REGARDING ANY RESTRICTIONS TO BE IMPOSED ON THE TRANSACTION. ITHAKA'S OFFICERS AND KEY EMPLOYEES ARE LIKEWISE REQUIRED TO DISCLOSE TO THEIR SUPERVISORS PROMPTLY ALL CONFLICTS OF INTEREST THAT ARISE AND COMPLETE AN ANNUAL CONFLICTS OF INTEREST DISCLOSURE STATEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 15A AND 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION POLICY: THE COMPENSATION COMMITTEE OF THE BOARD OF TRUSTEES OF ITHAKA HARBORS, INC. CONDUCTS AN ANNUAL REVIEW OF OFFICER AND NON-OFFICER COMPENSATION. AS PART OF THIS REVIEW, THE COMMITTEE REFERENCES AVAILABLE MARKET DATA FOR COMPARABLE POSITIONS AND INTERNAL EQUITY CONSIDERATIONS, AND IT UTILIZES AN ANALYSIS OF OFFICER AND NON-OFFICER SALARIES PREPARED BY INDEPENDENT EXTERNAL SOURCES USING INDUSTRY BENCHMARKING DATA. THE ANNUAL REVIEW PROCESS COVERS ALL OFFICERS AND OTHER STAFF. COMPENSATION DECISIONS FOR OFFICERS ARE PROPOSED BY THE COMPENSATION COMMITTEE OF ITHAKA, THEN REVIEWED AND APPROVED BY ITHAKA'S FULL BOARD OF TRUSTEES. COMPENSATION DECISIONS FOR NON-OFFICER EMPLOYEES ARE APPROVED BY THE COMPENSATION COMMITTEE OF ITHAKA.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ITHAKA'S FORM 990 AND ANNUAL FINANCIAL STATEMENTS ARE AVAILABLE UPON REQUEST; OTHER GOVERNING DOCUMENTS ARE NOT OPEN FOR PUBLIC INSPECTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VII</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH MEMBER OF THE BOARD OF TRUSTEES, EXCEPT THE PRESIDENT, IS ENTITLED TO A STIPEND FOR SERVICES PROVIDED AS A MEMBER OF THE GOVERNING BODY OF ITHAKA HARBORS, INC. NO PAYMENTS EXCEEDED THE REPORTING THRESHOLD OF $10,000; ACCORDINGLY THESE BOARD MEMBERS ARE DEEMED INDEPENDENT FOR REPORTING PURPOSES ON FORM 990, PART 1, LINE 4 AND PART VI, SECTION A, LINE 1B.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART X, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>SAVINGS AND TEMPORARY INVESTMENTS - END OF YEAR INCLUDES $27,030,300 OF CASH HELD FOR INVESTMENT DURING THE PERIOD DECEMBER 20, 2018 TO JANUARY 1, 2019. ON JANUARY 1, 2019, THESE FUNDS WERE INVESTED IN A PRIVATE PLACEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER CHANGES IN NET ASSETS CONSIST OF THE FOLLOWING: NET DEFICIT OF ARTSTOR AT DECEMBER 31, 2018 BECAME A DEFICIT OF ITHAKA AS OF DECEMBER 31, 2018 - (DATE OF MERGER) $(2,113,713) GOODWILL REPORTED BY ITHAKA REPRESENTING THE EXCESS OF CONSIDERATION RECEIVED OVER THE FAIR VALUE OF THE NET ASSETS AQUIRED IN THE MERGER WITH ARTSTOR INC. 3,950,957 WRITE-OFF OF UNCOLLECTIBLE FEES RECEIVABLES (31,065) ___________ TOTAL $ 1,806,179 ===========</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="IRS990ScheduleR">
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Ithaka International LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>2 RECTOR STREET</AddressLine1Txt>
          <CityNm>new york</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10006</ZIPCd>
        </USAddress>
        <EIN>461181573</EIN>
        <PrimaryActivitiesTxt>BUS DEVLPMT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <EndOfYearAssetsAmt>20704</EndOfYearAssetsAmt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ITHAKA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
      </IdDisregardedEntitiesGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>ARTSTOR INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>6 EAST 32ND STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10016</ZIPCd>
        </USAddress>
        <EIN>300152767</EIN>
        <PrimaryActivitiesTxt>DIGITAL SVCS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>509(A)(2)</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ITHAKA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>false</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>false</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>false</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>false</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>false</LoansOrGuaranteesFromOthOrgInd>
      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>false</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>false</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>true</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>false</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>true</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>false</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>false</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>true</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>false</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>true</TransferFromOtherOrgInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, SCHEDULE R, PART V, LINE 1S</FormAndLineReferenceDesc>
        <ExplanationTxt>SEE SCHEDULE O FOR A DESCRIPTION OF THE MERGER OF ITHAKA HARBORS, INC. AND ARTSTOR INC. EFFECTIVE DECEMBER 31, 2018.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>