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        <PersonNm>Nancy Yang</PersonNm>
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        <PersonNm>Jonathan D Klein</PersonNm>
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        <ExplanationTxt>The collections, which include art work, books, and artifacts of historical significance have been acquired through contributions since the School's inception and are not recognized as assets on the statements of financial position. Contributed collection items are not reflected on the financial statements. Proceeds from deaccessions or insurance recoveries are reflected as increases in the appropriate net asset class.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>The School follows FASB ASC 740, "Income Taxes", which clarifies the accounting for uncertain income tax positions by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. The School recognizes a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities. Management evaluated the School's tax positions and concluded that the School had no material uncertain income tax positions as of June 30, 2017 or 2016. The School is no longer subject to income tax examinations by the US federal, state, or local tax authorities for fiscal years before 2014. The School will account for interest and penalties related to uncertain tax positions, if any, as part of tax expense.</ExplanationTxt>
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        <ExplanationTxt>Unrealized gain on the value of interest rate swaps 3,444,269, reduced accrued pension liability 1,126,700, increase in value of split interest agreements 517,638, financial aid (6,107,615), and the recovery provision for uncollectible pledges (64,551).</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part XI, Line 4b</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
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        <TotalCompensationFilingOrgAmt>182543</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>Faculty are required to live in on-campus housing as a condition of employment. The Headmaster's home includes some space that is reserved for School related meetings and student activities. The cost of maintaining this allotted space is paid by the School and recorded as an operating expense. The Headmaster's contract, which is approved by the Board President and the Compensation Committee, includes the cost of residential cleaning. The cost is recorded by the School as a taxable benefit and reported on the W-2. The School will only pay for the cost of a traveling spouse when they are an authorized participant in School related functions. In such a case, the cost is treated as a non-taxable work-related event. The discretionary account is provided to the Headmaster as part of the approved annual budget. The account is used to fund small School related expenses and, as a result, is not reported as a taxable fringe benefit.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>The salary of Groton's Headmaster is determined annually by the Personnel Committee of the board. As input to their decision, the committee reviews the results of the annual ABOPS salary survey. ABOPS is a 40-member organization of independent schools whom we consider to be our peers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>The Headmaster's contract, which is approved by the President of the Board and the Compensation Committee, included an annual $43,000 deferred compensation contribution. The School deposited the initial payment to a qualified 457(b) plan up to the annual IRS limit of $18,000. The remaining balance was deposited to a non-qualified 457(f) plan. Each deposit to the 457(f) plan is subject to a three year vesting period and is distributed once the terms are satisfied. The initial payout from the plan in July of 2016 was recorded as a taxable distribution and reported on the W-2.</ExplanationTxt>
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      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>Massachusetts Development Finance Agency</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>043431814</BondIssuerEIN>
        <BondIssuedDt>2013-10-17</BondIssuedDt>
        <IssuePriceAmt>75000000</IssuePriceAmt>
        <PurposeDesc>Building renovations &amp; refinancing existing debt</PurposeDesc>
        <DefeasedInd>0</DefeasedInd>
        <OnBehalfOfIssuerInd>0</OnBehalfOfIssuerInd>
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      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <RetiredAmt>4710000</RetiredAmt>
        <BondDefeasedAmt>0</BondDefeasedAmt>
        <TotalProceedsAmt>75000000</TotalProceedsAmt>
        <InReserveFundAmt>0</InReserveFundAmt>
        <CapitalizedInterestAmt>644020</CapitalizedInterestAmt>
        <RefundingEscrowAmt>48640000</RefundingEscrowAmt>
        <IssuanceCostsFromProceedsAmt>474250</IssuanceCostsFromProceedsAmt>
        <CreditEnhancementAmt>0</CreditEnhancementAmt>
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        <CapitalExpendituresAmt>25885750</CapitalExpendituresAmt>
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        <AnyLeaseArrangementsInd>0</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>0</MgmtContractBondFincdPropInd>
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        <PrivateBusConcerningUBIPct>0</PrivateBusConcerningUBIPct>
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        <BondReferenceCd>A</BondReferenceCd>
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        <VariableRateIssueInd>1</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>1</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>Morgan Stanley Capital Services</BusinessNameLine1Txt>
          <BusinessNameLine2Txt>Bank of New York Mellon</BusinessNameLine2Txt>
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        <TermOfHedgePct>30</TermOfHedgePct>
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        <HedgeTerminatedInd>0</HedgeTerminatedInd>
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        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>1</ProceduresCorrectiveActionInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule K, Part IV, Line 4b-10/17/2013 75,000,000 Massachusetts Development Finance Agency</FormAndLineReferenceDesc>
        <ExplanationTxt>The Bank of New York Mellon Swap 20 years, The Bank of New York Mellon Swap 38 years, and Morgan Stanley Capital Services Swap 30 years.</ExplanationTxt>
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        <NameOfInterested>
          <PersonNm>Vuyelwa M Maqubela</PersonNm>
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        <RelationshipDescriptionTxt>Family Member of Temba Maqubela</RelationshipDescriptionTxt>
        <TransactionAmt>109106</TransactionAmt>
        <TransactionDesc>Employment</TransactionDesc>
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      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Alexander Diaz</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>Family Member of Arthur Diaz</RelationshipDescriptionTxt>
        <TransactionAmt>1500</TransactionAmt>
        <TransactionDesc>Employment</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
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    </IRS990ScheduleL>
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      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>119</ContributionCnt>
        <NoncashContributionsRptF990Amt>3624825</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
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      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Line 33</FormAndLineReferenceDesc>
        <ExplanationTxt>The number of security contributions is based on the number of gifts and not the number of shares received.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="R000013" softwareId="16000425" softwareVersionNum="v1.00">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A draft of the Form 990 without Schedule B was distributed electronically to each member of the Audit Committee. After a thorough review, the Committee had an opportunity to ask questions and suggest revisions during a group conference call. The draft was also posted to a secure electronic portal, accessible by the full Board, prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>All School officers, key employees, and members of the Board of Trustees are required annually to read the conflict of interest policy and sign the document. The signature indicates an understanding of the guidelines and an assurance to the Board that they are in compliance with the policy. Any potential conflict must be disclosed and reviewed by the President of the Board to determine if further action is required. Any identified conflict will prohibit such individual from participating in the governing body's deliberations and transaction decisions related to the conflict.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>An employment contract between the Headmaster and the School is updated periodically and renewed annually. Each year, the President of the Board and the Compensation Committee review the Headmaster's and other senior administrator's salaries and benefits. The salary survey provided by the Association of Business Officers of Preparatory Schools is used as a guide and a point of comparison. The annual salary and benefit offerings for the Chief Financial Officer are made by the Headmaster. All salaries and benefit offerings for the remaining School employees are updated annually and approved by the Chief Financial Officer or the Headmaster up the aggregate salary increase approved by the Board of Trustees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 without Schedule B can be viewed on-line by going to guidestar.org, an independently operated website. The conflict of Interest Policy and the Governing Documents may be viewed any time upon request for the same period of disclosure set forth in Section 6104(d).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Change in value of interest rate swap agreements 3,444,269, accrued pension liability 1,126,700, split interest agreements 517,638, and recovery for uncollectable pledges (64,551).</ExplanationTxt>
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    </IRS990ScheduleO>
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          <BusinessNameLine1Txt>Charitable Remainder Trust (5)</BusinessNameLine1Txt>
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          <AddressLine1Txt>PO Box 991</AddressLine1Txt>
          <CityNm>Groton</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
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        <PrimaryActivitiesTxt>Charitable Trust</PrimaryActivitiesTxt>
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          <BusinessNameLine1Txt>Groton School</BusinessNameLine1Txt>
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          <AddressLine1Txt>PO Box 991</AddressLine1Txt>
          <CityNm>Groton</CityNm>
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        <InvolvedAmt>0</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>The aggregate annual transfers from the fund to the School that represent the value of the fund assigned to the beneficiaries upon their death.</MethodOfAmountDeterminationTxt>
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          <BusinessNameLine1Txt>Pooled Income Fund</BusinessNameLine1Txt>
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        <MethodOfAmountDeterminationTxt>The aggregate annual transfers from the fund to the School that represent the value of the fund assigned to the beneficiaries upon their death.</MethodOfAmountDeterminationTxt>
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        <MethodOfAmountDeterminationTxt>The aggregate annual transfers from the fund to the School that represent the value of the fund assigned to the beneficiaries upon their death.</MethodOfAmountDeterminationTxt>
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