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      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>1775084</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>128835</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>128835</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1646249</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>1646249</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1603339</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>1603339</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>1603339</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>IBSC, a not-for-profit organization, is exempt from income taxes under Internal Revenue Code Section 501(c)(3) and is also exempt from the State of California franchise and income tax under Section 23701(d) of the State Revenue and Taxation Code. The Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 740-10, Accounting for Uncertainties in Income Tax, sets a minimum threshold for financial statement recognition of the benefit of a tax position taken or expected to be taken in a tax return. IBSC has reviewed its position for all open tax years and has determined that it has no uncertain tax positions requiring accrual or disclosure.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ" softwareId="24020490" softwareVersionNum="2024v5.2">
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>AMY P AHART</PersonNm>
        <TitleTxt>COO</TitleTxt>
        <BaseCompensationFilingOrgAmt>210395</BaseCompensationFilingOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>6500</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>216895</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>IAN THOMAS BATTY</PersonNm>
        <TitleTxt>Executive Dir.</TitleTxt>
        <BaseCompensationFilingOrgAmt>219420</BaseCompensationFilingOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>6583</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>226003</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020490" softwareVersionNum="2024v5.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE SHALL BE TWO CLASSES OF MEMBERS.1.Institutional Members shall be schools, domestic or foreign, which are primarily for boys, which have either primary and/or secondary school classes and which meet the eligibility requirements established by the Board of Trustees (the Board) from time to time. Institutional Members shall be nonvoting members but shall be entitled to participate in Board discussions and be invited to make recommendations to the Board.2.Associate Members shall be individuals, schools, associations, or other organizations which may wish to work with the Corporation for the achievement of its purposes and which meet the eligibility requirements established by the Board from time to time. Associate Members shall be nonvoting members but may be allowedsubject to Board approvalto participate in Board discussions and be invited to make recommendations to the Board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>PROVIDED TO EXECUTIVE DIRECTOR FOR REVIEW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL EMPLOYEES OF IBSC HAVE AN OBLIGATION TO CONDUCT BUSINESS WITHIN GUIDELINES THAT PROHIBIT ACTUAL, POTENTIAL, OR PERCEIVED CONFLICTS OF INTEREST. THE PURPOSE OF THESE GUIDELINES IS TO PROVIDE GENERAL DIRECTION SO THAT EMPLOYEES CAN SEEK FURTHER CLARIFICATION ON ISSUES RELATED TO THE SUBJECT OF ACCEPTABLE STANDARDS OF OPERATION. AN ACTUAL, POTENTIAL, OR PERCEIVED CONFLICT OF INTEREST OCCURS WHEN AN EMPLOYEE IS IN A POSITION TO INFLUENCE A DECISION THAT MAY RESULT IN A PERSONAL GAIN FOR THE EMPLOYEE OR FOR A RELATIVE AS A RESULT OF IBSC'S BUSINESS DEALINGS FOR THE PURPOSE OF THIS POLICY. A RELATIVE IS ANY PERSON WHO IS RELATED BY BLOOD OR MARRIAGE, OR WHOSE RELATIONSHIP WITH THE EMPLOYEE OR BOARD MEMBER IS SIMILAR TO THAT OF PERSONS WHO ARE RELATED BY BLOOD OR MARRIAGE. IF AN EMPLOYEE HAS ANY INFLUENCE ON TRANSACTIONS INVOLVING PURCHASES, CONTRACTS, OR LEASES, IT IS IMPERATIVE THAT HE OR SHE DISCLOSES TO AN OFFICER OF THE ORGANIZATION AS SOON AS POSSIBLE THE EXISTENCE OF ANY ACTUAL OR POTENTIAL CONFLICT OF INTEREST SO THAT SAFEGUARDS CAN BE ESTABLISHED TO PROTECT ALL PARTIES. EXAMPLES OF THIS INCLUDE PURCHASING OF OFFICE OR OTHER SUPPLIES FROM A FAMILY MEMBER, HAVING SUBSTANTIAL FINANCIAL INTEREST IN A VENDOR, AND SIMILAR SITUATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>EXECUTIVE DIRECTOR COMPENSATION IS SUBJECT TO REVIEW BY CHAIR AND BOARD OF TRUSTEES IN EXECUTIVE SESSION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>VOLUNTEERS PROVIDE EVENT MANAGEMENT SUPPORT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>