﻿<?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="2025v4.2">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2026-07-14T12:25:25-05:00</ReturnTs>
    <TaxPeriodEndDt>2025-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>582487348</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>Aprio Advisory Group LLC</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>111 Rockville Pike Suite 600</AddressLine1Txt>
        <CityNm>Rockville</CityNm>
        <StateAbbreviationCd>MD</StateAbbreviationCd>
        <ZIPCd>20850</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2025-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>852884934</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>Edgemoor Research Institute</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>EDGE</BusinessNameControlTxt>
      <PhoneNum>3015264569</PhoneNum>
      <USAddress>
        <AddressLine1Txt>5110 Edgemoor Lane</AddressLine1Txt>
        <CityNm>Bethesda</CityNm>
        <StateAbbreviationCd>MD</StateAbbreviationCd>
        <ZIPCd>20814</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Stephen D Crocker</PersonNm>
      <PersonTitleTxt>Chair</PersonTitleTxt>
      <PhoneNum>3015264569</PhoneNum>
      <SignatureDt>2026-07-10</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>Stacy Cullen</PreparerPersonNm>
      <PTIN>P00974308</PTIN>
      <PhoneNum>3012316200</PhoneNum>
      <PreparationDt>2026-07-09</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2025</TaxYr>
    <BuildTS>2025-03-06 01:10:19Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="5">
    <IRS990EZ documentId="RetDoc1234200001" referenceDocumentId="RetDoc1051800001 RetDoc2278000001">
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <WebsiteAddressTxt>N/A</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="RetDoc1039100001">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>186133</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>171006</ContributionsGiftsGrantsEtcAmt>
      <ProgramServiceRevenueAmt>15000</ProgramServiceRevenueAmt>
      <SaleOfAssetsGrossAmt>127</SaleOfAssetsGrossAmt>
      <GainOrLossFromSaleOfAssetsAmt>127</GainOrLossFromSaleOfAssetsAmt>
      <TotalRevenueAmt>186133</TotalRevenueAmt>
      <GrantsAndSimilarAmountsPaidAmt>164031</GrantsAndSimilarAmountsPaidAmt>
      <FeesAndOtherPymtToIndCntrctAmt>62598</FeesAndOtherPymtToIndCntrctAmt>
      <OtherExpensesTotalAmt>5758</OtherExpensesTotalAmt>
      <TotalExpensesAmt>232387</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>-46254</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>193001</NetAssetsOrFundBalancesBOYAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <NetAssetsOrFundBalancesEOYAmt>146747</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>193225</BOYAmt>
        <EOYAmt>154676</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <Form990TotalAssetsGrp>
        <BOYAmt>193225</BOYAmt>
        <EOYAmt>154676</EOYAmt>
      </Form990TotalAssetsGrp>
      <SumOfTotalLiabilitiesGrp>
        <BOYAmt>224</BOYAmt>
        <EOYAmt>7929</EOYAmt>
      </SumOfTotalLiabilitiesGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>193001</BOYAmt>
        <EOYAmt>146747</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <PrimaryExemptPurposeTxt>Edgemoor Research Institute's mission is to bring together non-profit, for-profit, government, end users and other stakeholders to work together to share knowledge and establish voluntary technical solutions to complex data-related public policy challenges. 1. With respect to the internet, to (a) research and develop concepts underlying data registration directory services that encompass the needs of the multiple communities that collect, process and use registration data; and (b) develop a voluntary and flexible framework and model for expressing registration data directory services policies. 2. To develop methodologies for building similar frameworks and models in other fields. 3. To engage in research to analyze and compare policies, create tools to facilitate such research and make them available for general use. 4. To engage in educational initiatives, including by convening multi-party discussions and decision-making processes.</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Edgemoor Research Institute developed a framework and model for representing the rules registrar use or propose to use for collection, validation, and labeling data elements and the rules requesters propose to follow to get access to that data for scientific purposes. This framework and model, was originally developed in Excel. Project Jake, focused on Domain Name Registration Data collection and disclosure policies. The primary result is a proposed distributed architecture.In 2025, based on the model developed previously, software development began to demonstrate and test the concepts and usability.</DescriptionProgramSrvcAccomTxt>
        <GrantsAndAllocationsAmt>0</GrantsAndAllocationsAmt>
        <ProgramServiceExpensesAmt>28168</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Project Ice, which is focused on the science of glaciers and the formulation of field work to learn more about the structure of glaciers. Following up on the Stanford University workshop in December 2023, which focused on feasibility of intervention, a second workshop, focused on governance issues associated with any potential intervention, took place in New York City in September 2024. In 2025, the Ice Preservation Institute (IPI) was created and granted 501(c)(3) status on 2 September 2025, with an effective date of exemption of 25 January 2025. Edgemoor Research Institute transferred all ongoing work and funds to IPI and closed the project.</DescriptionProgramSrvcAccomTxt>
        <GrantsAndAllocationsAmt>164031</GrantsAndAllocationsAmt>
        <ProgramServiceExpensesAmt>196954</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>225122</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Stephen D Crocker</PersonNm>
        <TitleTxt>Chair</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>30.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Cedarampattu Mohan</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.30</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Scott Bradner</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.30</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Sarah Deutsch</PersonNm>
        <TitleTxt>Member</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>0.30</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <InfoInScheduleOPartVInd>X</InfoInScheduleOPartVInd>
      <ActivitiesNotPreviouslyRptInd>0</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>0</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>0</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>0</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>0</OrganizationDissolvedEtcInd>
      <DirectIndirectPltclExpendAmt>0</DirectIndirectPltclExpendAmt>
      <MadeLoansToFromOfficersInd>0</MadeLoansToFromOfficersInd>
      <TaxImposedUnderIRC4911Amt>0</TaxImposedUnderIRC4911Amt>
      <TaxImposedUnderIRC4912Amt>0</TaxImposedUnderIRC4912Amt>
      <TaxImposedUnderIRC4955Amt>0</TaxImposedUnderIRC4955Amt>
      <EngagedInExcessBenefitTransInd>0</EngagedInExcessBenefitTransInd>
      <TaxImposedOnOrganizationMgrAmt>0</TaxImposedOnOrganizationMgrAmt>
      <TaxReimbursedByOrganizationAmt>0</TaxReimbursedByOrganizationAmt>
      <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
      <StatesWhereCopyOfReturnIsFldCd>MD</StatesWhereCopyOfReturnIsFldCd>
      <BooksInCareOfDetail>
        <BusinessName>
          <BusinessNameLine1Txt>Accounting and Management Services LLC</BusinessNameLine1Txt>
        </BusinessName>
        <USAddress>
          <AddressLine1Txt>1200 G Street NW Suite 800</AddressLine1Txt>
          <CityNm>Washington</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20005</ZIPCd>
        </USAddress>
        <PhoneNum>2027967891</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>0</ForeignFinancialAccountInd>
      <ForeignOfficeInd>0</ForeignOfficeInd>
      <DonorAdvisedFndsInd>0</DonorAdvisedFndsInd>
      <OperateHospitalInd>0</OperateHospitalInd>
      <TanningServicesProvidedInd>0</TanningServicesProvidedInd>
      <RelatedOrganizationCtrlEntInd>0</RelatedOrganizationCtrlEntInd>
      <PoliticalCampaignActyInd>0</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>0</LobbyingActivitiesInd>
      <SchoolOperatingInd>0</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>0</TrnsfrExmptNonChrtblRltdOrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>1</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>342515</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>40000</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>221346</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>186006</CurrentTaxYearAmt>
        <TotalAmt>789867</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>342515</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>40000</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>221346</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>186006</CurrentTaxYearAmt>
        <TotalAmt>789867</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>521977</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>267890</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearAmt>127</CurrentTaxYearAmt>
        <TotalAmt>127</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <TotalSupportAmt>789994</TotalSupportAmt>
      <PublicSupportCY170Pct>0.33910</PublicSupportCY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleO documentId="RetDoc1051800001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 10 - Grants and Similar Amounts Paid</FormAndLineReferenceDesc>
        <ExplanationTxt>Activity Classification: . Grantee Name: Ice Preservation Institute. Grantee Address: 2216 Springfield Way San Mateo, CA 94403. Amount Given: 164,031.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16 - Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Description: Licenses and Fees. Amount: 66. Description: Online Services. Amount: 361. Description: Depreciation. Amount: 1,799. Description: Travel. Amount: 2,862. Description: Bank Fee. Amount: 670. Total to Form 990-EZ, line 16: 5,758.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 26 - Other Liabilities</FormAndLineReferenceDesc>
        <ExplanationTxt>Description: Accounts Payable. Beg. of Year Amount: 224. End of Year Amount: 7,929.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <TransferPrsnlBnftContractsDecl documentId="RetDoc2278000001">
      <DeclarationDesc>The organization did not, during the year, receive any funds, directly,or indirectly, to pay premiums on a personal benefit contract.The organization, did not, during the year, pay any premiums, directly,or indirectly, on a personal benefit contract.</DeclarationDesc>
    </TransferPrsnlBnftContractsDecl>
  </ReturnData>
</Return>