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      <Desc>SCIENCEScience remains the foundation of 5 Gyres' work - guiding solutions, informing decision-makers, and shaping the narrative around plastics as both an environmental and human health crisis.In 2024, our team conducted and published cutting-edge research demonstrating plastics' broad planetary impacts and calling for systemic change beyond waste management. Through our participation in the Global Plastics Treaty negotiations (INC-4 and INC-5), we provided credible, evidence-based guidance to international delegates as part of the Scientists' Coalition for an Effective Plastics Treaty, a network of over 350 experts.We advanced our leadership on microfibers and textiles with the WOVEN Symposium Series, convening global leaders in North America, the UK, and Australia to develop solutions to microfiber pollution. Our research projects on airborne microfibers and laundering interventions continue to inform industry and policy innovation.To engage the public, we launched the Do Less for the Planet campaign - inspiring over 400 individuals to pledge to reduce their plastic footprint through simple behavior changes.In 2025, our science program will continue to connect rigorous research to real-world solutions, supporting advocacy, education, and innovation globally.</Desc>
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        <Desc>POLICY ADVOCACYAt local, state, national, and international levels, 5 Gyres leverages scientific expertise and coalition-building skills to influence meaningful policy change.In 2024, we helped advance the Fighting Fibers Act, which would require microfiber filters on new washing machines sold in the U.S., and the Plastic Pellet Free Waters Act, holding plastic producers accountable for pellet pollution.In California, we co-sponsored and advanced several bills, including:- Reusable Cups (SB 1167): Mandating reusable cups in dine-in chain restaurants.- Mitigating Microplastics (AB 2214): Creating a state-level interagency group to address microplastic pollution.While not all bills passed into law this session, our work built crucial awareness, bipartisan momentum, and strengthened relationships with decision-makers - laying the foundation for success in 2025.We also maintained a strong presence at California Ocean Day and Capitol Hill Ocean Week (CHOW) to advocate for ocean health and plastic pollution solutions.</Desc>
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        <Desc>TRASHBLITZ AND PLASTIC FREE PARKSThrough our community science program and TrashBlitz mobile app, we continue to empower communities to document waste trends and advocate for change.In 2024, the Plastic-Free Parks TrashBlitz expanded to 58 parks - nearly double the reach of 2023 - collecting over 12,500 data points. This data underscores the persistent prevalence of plastics in our national parks (nearly 80% of waste recorded) and strengthens our advocacy for park-focused policies, like the Reducing Waste in National Parks Act.We also supported regional solutions through the TrashBlitz Community Fund, which enabled Clean Miami Beach to conduct 28 cleanups at 17 sites, collecting and analyzing over 20,000 pieces of trash.In 2025, TrashBlitz will continue to scale its reach, deepen partnerships, and provide actionable, science-backed insights for policy and community solutions.</Desc>
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        <Desc>AMBASSADOR NETWORKOur global Ambassador Network remains central to 5 Gyres' community engagement. In 2024, the program underwent a strategic refresh with new branding, improved digital engagement tools, and expanded opportunities for Ambassadors to participate in campaigns, events, and advocacy.In 2025, our Ambassadors will play an even larger role in advancing 5 Gyres' mission, mobilizing grassroots action, supporting policy priorities, and amplifying our reach in key communities around the world.</Desc>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>27589</ManagementAndGeneralAmt>
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      <FeesForServicesLobbyingGrp>
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        <ProgramServicesAmt>13851</ProgramServicesAmt>
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      <FeesForServicesProfFundraising>
        <TotalAmt>58225</TotalAmt>
        <FundraisingAmt>58225</FundraisingAmt>
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      <FeesForServicesOtherGrp>
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        <ProgramServicesAmt>277357</ProgramServicesAmt>
        <FundraisingAmt>24230</FundraisingAmt>
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      <OfficeExpensesGrp>
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        <ManagementAndGeneralAmt>1507</ManagementAndGeneralAmt>
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      <OccupancyGrp>
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        <ManagementAndGeneralAmt>5447</ManagementAndGeneralAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>16851</ProgramServicesAmt>
        <FundraisingAmt>3541</FundraisingAmt>
      </ConferencesMeetingsGrp>
      <InterestGrp>
        <TotalAmt>12460</TotalAmt>
        <ManagementAndGeneralAmt>12460</ManagementAndGeneralAmt>
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      <DepreciationDepletionGrp>
        <TotalAmt>5355</TotalAmt>
        <ProgramServicesAmt>5355</ProgramServicesAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>7579</TotalAmt>
        <ManagementAndGeneralAmt>7579</ManagementAndGeneralAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Payroll Processing Fees</Desc>
        <TotalAmt>29851</TotalAmt>
        <ProgramServicesAmt>20111</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3363</ManagementAndGeneralAmt>
        <FundraisingAmt>6377</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Software and apps</Desc>
        <TotalAmt>24139</TotalAmt>
        <FundraisingAmt>24139</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>Taxes and licenses</Desc>
        <TotalAmt>8986</TotalAmt>
        <ManagementAndGeneralAmt>8986</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Merchandise</Desc>
        <TotalAmt>3849</TotalAmt>
        <ProgramServicesAmt>3849</ProgramServicesAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>3785</TotalAmt>
        <ManagementAndGeneralAmt>3322</ManagementAndGeneralAmt>
        <FundraisingAmt>463</FundraisingAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>1382828</TotalAmt>
        <ProgramServicesAmt>915575</ProgramServicesAmt>
        <ManagementAndGeneralAmt>166948</ManagementAndGeneralAmt>
        <FundraisingAmt>300305</FundraisingAmt>
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      <CashNonInterestBearingGrp>
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        <EOYAmt>80087</EOYAmt>
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      <SavingsAndTempCashInvstGrp>
        <BOYAmt>307356</BOYAmt>
        <EOYAmt>11267</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <AccountsReceivableGrp>
        <BOYAmt>26470</BOYAmt>
        <EOYAmt>54917</EOYAmt>
      </AccountsReceivableGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>50</BOYAmt>
        <EOYAmt>50</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>576128</BOYAmt>
        <EOYAmt>764236</EOYAmt>
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      <IntangibleAssetsGrp>
        <BOYAmt>5355</BOYAmt>
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      <TotalAssetsGrp>
        <BOYAmt>952564</BOYAmt>
        <EOYAmt>910557</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>8975</BOYAmt>
        <EOYAmt>9921</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <UnsecuredNotesLoansPayableGrp>
        <BOYAmt>150000</BOYAmt>
        <EOYAmt>150000</EOYAmt>
      </UnsecuredNotesLoansPayableGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>158975</BOYAmt>
        <EOYAmt>159921</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>649837</BOYAmt>
        <EOYAmt>742786</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>143752</BOYAmt>
        <EOYAmt>7850</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>793589</BOYAmt>
        <EOYAmt>750636</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>952564</BOYAmt>
        <EOYAmt>910557</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-134841</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>91888</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>0</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>1190407</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1104977</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1051825</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1100158</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1235205</CurrentTaxYearAmt>
        <TotalAmt>5682572</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>1190407</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1104977</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1051825</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1100158</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1235205</CurrentTaxYearAmt>
        <TotalAmt>5682572</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>1130351</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>4552221</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus3YearsAmt>105</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>12</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>18566</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>35180</CurrentTaxYearAmt>
        <TotalAmt>53863</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <TotalSupportAmt>5736435</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>8151</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.79360</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.86980</PublicSupportPY170Pct>
      <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>
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    <IRS990ScheduleC documentId="RetDoc1039700001">
      <VolunteersInd>0</VolunteersInd>
      <PaidStaffOrManagementInd>0</PaidStaffOrManagementInd>
      <MediaAdvertisementsInd>0</MediaAdvertisementsInd>
      <MailingsMembersInd>0</MailingsMembersInd>
      <PublicationsOrBroadcastInd>0</PublicationsOrBroadcastInd>
      <GrantsOtherOrganizationsInd>0</GrantsOtherOrganizationsInd>
      <DirectContactLegislatorsInd>1</DirectContactLegislatorsInd>
      <DirectContactLegislatorsAmt>2450</DirectContactLegislatorsAmt>
      <RalliesDemonstrationsInd>0</RalliesDemonstrationsInd>
      <OtherActivitiesInd>1</OtherActivitiesInd>
      <OtherActivitiesAmt>11400</OtherActivitiesAmt>
      <TotalLobbyingExpendituresAmt>13850</TotalLobbyingExpendituresAmt>
      <NotDescribedSection501c3Ind>0</NotDescribedSection501c3Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II-B, Line 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>Policy is an ever-changing and slow-moving process, but we are thrilled to be on the front lines of using science to inform real change by participating in coalition building networks and advocating for upstream solutions in our local, national, and global communities. This year's work led to impressive progress made at the Local, State, and Federal levels.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>1339875</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>91888</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>91888</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1247987</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>1247987</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1382828</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>1382828</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1382828</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounting standards require an organization to evaluate its tax positions and provide for a liability for any positions that would not be considered 'more likely than not' to be upheld under a tax authority examination. Management has evaluated its tax positions and has concluded that a provision for a tax liability is not necessary at September 30, 2024 and 2023. Generally, the Organization's information returns remain open for examination for a period of three (federal) or four (state of California) years from the date of filing.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041200001">
      <SolicitationOfNonGovtGrantsInd>X</SolicitationOfNonGovtGrantsInd>
      <AgrmtProfFundraisingActyInd>1</AgrmtProfFundraisingActyInd>
      <FundraiserActivityInfoGrp>
        <OrganizationBusinessName>
          <BusinessNameLine1Txt>Jennifer L Sissler</BusinessNameLine1Txt>
        </OrganizationBusinessName>
        <USAddress>
          <AddressLine1Txt>1519 Church Hill Place</AddressLine1Txt>
          <CityNm>Reston</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>20194</ZIPCd>
        </USAddress>
        <ActivityTxt>Fundraising Strategy</ActivityTxt>
        <FundraiserControlOfFundsInd>0</FundraiserControlOfFundsInd>
        <GrossReceiptsAmt>0</GrossReceiptsAmt>
        <RetainedByContractorAmt>55000</RetainedByContractorAmt>
        <NetToOrganizationAmt>-55000</NetToOrganizationAmt>
      </FundraiserActivityInfoGrp>
      <TotalRetainedByContractorsAmt>55000</TotalRetainedByContractorsAmt>
      <TotalNetToOrganizationAmt>-55000</TotalNetToOrganizationAmt>
    </IRS990ScheduleG>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Anna Cummins and Marcus Eriksen are married.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors reviews the Form 990 prior to filing the return.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Documents and forms are available upon written request to the organization.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Program contractors: Program service expenses 246,766. Management and general expenses 0. Fundraising expenses 0. Total expenses 246,766. Research fees: Program service expenses 6,330. Management and general expenses 0. Fundraising expenses 0. Total expenses 6,330. Other Professional Fees: Program service expenses 24,261. Management and general expenses 0. Fundraising expenses 12,150. Total expenses 36,411. Merchant fees: Program service expenses 0. Management and general expenses 0. Fundraising expenses 12,080. Total expenses 12,080.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>