{"url_path":"/sec/cik-0002082557/10-q/2026/cover-page","section_key":"cover-page","section_title":"Cover Page","topic":"sec","document":{"doc_type":"10-Q","doc_date":"2026-05-15","source_url":"https://www.sec.gov/Archives/edgar/data/2082557/0002082557-26-000031-index.html","accession_number":"0002082557-26-000031","cik":"0002082557","ticker":null,"issuer_name":"Golub Capital Private Income Fund S","edgar_url":"https://www.sec.gov/Archives/edgar/data/2082557/0002082557-26-000031-index.html","primary_entity_key":"0002082557","primary_entity_name":"Golub Capital Private Income Fund S"},"word_count":2032,"has_tables":true,"body_markdown":"gpifs-20260331\nfalse2026Q20002082557September 3011xbrli:sharesiso4217:USDiso4217:USDxbrli:sharesxbrli:puregpifs:segmentgpifs:componentiso4217:CADiso4217:EURiso4217:GBP00020825572025-10-012026-03-3100020825572026-05-1500020825572026-03-3100020825572026-01-012026-03-3100020825572025-12-302026-03-310002082557us-gaap:CommonStockMember2025-12-290002082557us-gaap:AdditionalPaidInCapitalMember2025-12-290002082557us-gaap:RetainedEarningsMember2025-12-2900020825572025-12-290002082557us-gaap:CommonStockMember2025-12-302026-03-310002082557us-gaap:AdditionalPaidInCapitalMember2025-12-302026-03-310002082557us-gaap:RetainedEarningsMember2025-12-302026-03-310002082557us-gaap:CommonStockMember2026-03-310002082557us-gaap:AdditionalPaidInCapitalMember2026-03-310002082557us-gaap:RetainedEarningsMember2026-03-310002082557us-gaap:CommonStockMember2025-12-310002082557us-gaap:AdditionalPaidInCapitalMember2025-12-310002082557us-gaap:RetainedEarningsMember2025-12-3100020825572025-12-310002082557us-gaap:CommonStockMember2026-01-012026-03-310002082557us-gaap:AdditionalPaidInCapitalMember2026-01-012026-03-310002082557us-gaap:RetainedEarningsMember2026-01-012026-03-310002082557gpifs:GPIFSFundingGPIFSHoldingsAndPIFHoldingBlockerSMember2025-12-310002082557us-gaap:RevolvingCreditFacilityMembergpifs:BANACreditFacilityMemberus-gaap:LineOfCreditMember2025-12-310002082557us-gaap:RevolvingCreditFacilityMembergpifs:BANACreditFacilityMemberus-gaap:LineOfCreditMember2026-03-310002082557Signia Aerospace, LLC | Senior secured 12026-03-310002082557Signia Aerospace, LLC | Senior secured 22026-03-310002082557SMX Technologies | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:AerospaceDefenseSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:AutoComponentsSectorMember2026-03-310002082557CAP-KSI Holdings, LLC | One stop 12026-03-310002082557CAP-KSI Holdings, LLC | One stop 22026-03-310002082557Denali Midco 2, LLC | One stop 12026-03-310002082557Denali Midco 2, LLC | One stop 22026-03-310002082557Denali Midco 2, LLC | One stop 32026-03-310002082557Denali Midco 2, LLC | Second lien2026-03-310002082557National Express Wash Parent Holdco, LLC | One stop 12026-03-310002082557National Express Wash Parent Holdco, LLC | One stop 22026-03-310002082557National Express Wash Parent Holdco, LLC | One stop 32026-03-310002082557Paint Intermediate III, LLC | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:AutomobilesSectorMember2026-03-310002082557Financial Information Technologies, LLC | One stop 12026-03-310002082557Financial Information Technologies, LLC | One stop 22026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:BeveragesSectorMember2026-03-310002082557BECO Holding Company, Inc. | One stop 12026-03-310002082557BECO Holding Company, Inc. | One stop 22026-03-310002082557BECO Holding Company, Inc. | One stop 32026-03-310002082557BECO Holding Company, Inc. | One stop 42026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:BuildingProductsSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:CapitalMarketsSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:ChemicalsMember2026-03-310002082557BradyPLUS Holdings | Senior secured2026-03-310002082557CI (Quercus) Intermediate Holdings, LLC | One stop 12026-03-310002082557CI (Quercus) Intermediate Holdings, LLC | One stop 22026-03-310002082557CI (Quercus) Intermediate Holdings, LLC | One stop 32026-03-310002082557Dispatch Acquisition Holdings, LLC | One stop 12026-03-310002082557Dispatch Acquisition Holdings, LLC | One stop 22026-03-310002082557Gateway Services, Inc. | One stop 12026-03-310002082557Gateway Services, Inc. | One stop 22026-03-310002082557Gateway Services, Inc. | One stop 32026-03-310002082557Gateway Services, Inc. | One stop 42026-03-310002082557Gateway Services, Inc. | One stop 52026-03-310002082557Gateway Services, Inc. | One stop 62026-03-310002082557Gateway Services, Inc. | One stop 72026-03-310002082557Gateway Services, Inc. | One stop 82026-03-310002082557Kleinfelder Intermediate, LLC | One stop2026-03-310002082557OMNIA Partners, LLC | Senior secured2026-03-310002082557PT Intermediate Holdings III, LLC | One stop 12026-03-310002082557PT Intermediate Holdings III, LLC | One stop 22026-03-310002082557Radwell Parent, LLC | One stop 12026-03-310002082557Radwell Parent, LLC | One stop 22026-03-310002082557Radwell Parent, LLC | One stop 32026-03-310002082557Radwell Parent, LLC | One stop 42026-03-310002082557Radwell Parent, LLC | One stop 52026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:CommercialServicesAndSuppliesSectorMember2026-03-310002082557Chariot Buyer, LLC | Senior secured2026-03-310002082557EagleView Technology Corporation | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:ConstructionAndEngineeringSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:ConstructionMaterialsMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:ConsumerFinanceMember2026-03-310002082557AOT Packaging Products Acquisitionco, LLC | Senior secured2026-03-310002082557Berlin Packaging, LLC | Senior secured2026-03-310002082557Chase Intermediate | One stop 12026-03-310002082557Chase Intermediate | One stop 22026-03-310002082557Chase Intermediate | One stop 32026-03-310002082557Packaging Coordinators Midco, Inc. | One stop 12026-03-310002082557Packaging Coordinators Midco, Inc. | One stop 22026-03-310002082557Packaging Coordinators Midco, Inc. | One stop 32026-03-310002082557Packaging Coordinators Midco, Inc. | One stop 42026-03-310002082557Packaging Coordinators Midco, Inc. | One stop 52026-03-310002082557Packaging Coordinators Midco, Inc. | One stop 62026-03-310002082557Packaging Coordinators Midco, Inc. | One stop 72026-03-310002082557Technimark, LLC | Senior secured2026-03-310002082557WP Deluxe Merger Sub | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMemberus-gaap:ContainerAndPackagingSectorMember2026-03-310002082557PADI Holdco, Inc. | One stop 12026-03-310002082557PADI Holdco, Inc. | One stop 22026-03-310002082557PADI Holdco, Inc. | One stop 32026-03-310002082557PADI Holdco, Inc. | One stop 42026-03-310002082557Project Alpha Intermediate Holdings, Inc. | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:DiversifiedConsumerServicesSectorMember2026-03-310002082557BCPE Pequod Buyer | Senior secured2026-03-310002082557Finastra | Senior secured2026-03-310002082557First Eagle Investment Management | Senior secured 12026-03-310002082557First Eagle Investment Management | Senior secured 22026-03-310002082557Focus Financial Partners, LLC | Senior secured2026-03-310002082557GTCR Everest Borrower, LLC | Senior secured2026-03-310002082557Orion Advisor Solutions | Senior secured2026-03-310002082557OSTTRA Group, Ltd. | Senior secured2026-03-310002082557Zebra Buyer LLC | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:DiversifiedFinancialServicesSectorMember2026-03-310002082557Pioneer AcquisitionCo, LLC | Senior secured2026-03-310002082557Resilience Parent, LLC | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:ElectricUtilitiesSectorMember2026-03-310002082557Eagle Parent Corp. | Senior secured2026-03-310002082557PDI TA Holdings, Inc. | One stop 12026-03-310002082557PDI TA Holdings, Inc. | One stop 22026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:FoodAndStaplesRetailingSectorMember2026-03-310002082557Aspire Bakeries Holdings, LLC | Senior secured2026-03-310002082557MIC GLEN LLC | Senior secured2026-03-310002082557PFI Lower MidCo, LLC | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:FoodProductsSectorMember2026-03-310002082557CCSL Holdings, LLC | One stop 12026-03-310002082557CCSL Holdings, LLC | One stop 22026-03-310002082557CCSL Holdings, LLC | One stop 32026-03-310002082557CCSL Holdings, LLC | One stop 42026-03-310002082557Centegix Intermediate II, LLC | One stop 12026-03-310002082557Centegix Intermediate II, LLC | One stop 22026-03-310002082557CMI Parent Inc. | One stop 12026-03-310002082557CMI Parent Inc. | One stop 22026-03-310002082557CMI Parent Inc. | One stop 32026-03-310002082557Confluent Medical Technologies, Inc. | Senior secured2026-03-310002082557NSM Top Holdings Corp. | Senior secured2026-03-310002082557Precision Medicine Group, LLC | Senior secured2026-03-310002082557Resonetics, LLC | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:HealthcareEquipmentAndSuppliesSectorMember2026-03-310002082557Acuity Eyecare Holdings, LLC | One stop2026-03-310002082557AVG Intermediate Holdings & AVG Subsidiary Holdings LLC | One stop2026-03-310002082557Datix Bidco Limited and RL Datix Holdings, Inc. | One stop 12026-03-310002082557Datix Bidco Limited and RL Datix Holdings, Inc. | One stop 22026-03-310002082557Datix Bidco Limited and RL Datix Holdings, Inc. | One stop 32026-03-310002082557Datix Bidco Limited and RL Datix Holdings, Inc. | One stop 42026-03-310002082557Hanger, Inc. | Senior secured 12026-03-310002082557Hanger, Inc. | Senior secured 22026-03-310002082557Mamba Purchaser, Inc. | Senior secured2026-03-310002082557PPV Intermediate Holdings, LLC | One stop 12026-03-310002082557PPV Intermediate Holdings, LLC | One stop 22026-03-310002082557PPV Intermediate Holdings, LLC | One stop 32026-03-310002082557PPV Intermediate Holdings, LLC | One stop 42026-03-310002082557Premise Health Holding Corp. | One stop2026-03-310002082557Signature MD, Inc. | One stop 12026-03-310002082557Signature MD, Inc. | One stop 22026-03-310002082557Signature MD, Inc. | One stop 32026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:HealthcareProvidersAndServicesSectorMember2026-03-310002082557GHX Ultimate Parent Corporation | One stop 12026-03-310002082557GHX Ultimate Parent Corporation | One stop 22026-03-310002082557Imprivata, Inc. | Senior secured2026-03-310002082557Mediware Information Systems, Inc. | Senior secured2026-03-310002082557Netsmart Technologies, Inc. | One stop 12026-03-310002082557Netsmart Technologies, Inc. | One stop 22026-03-310002082557Netsmart Technologies, Inc. | One stop 32026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:HealthcareTechnologySectorMember2026-03-310002082557BJH Holdings III Corp. | One stop 12026-03-310002082557BJH Holdings III Corp. | One stop 22026-03-310002082557Fertitta Entertainment, LLC | Senior secured2026-03-310002082557QSR Acquisition Co. | One stop 12026-03-310002082557QSR Acquisition Co. | One stop 22026-03-310002082557QSR Acquisition Co. | One stop 32026-03-310002082557Saguaro Buyer, LLC | One stop 12026-03-310002082557Saguaro Buyer, LLC | One stop 22026-03-310002082557Saguaro Buyer, LLC | One stop 32026-03-310002082557SDC Holdco, LLC | One stop2026-03-310002082557Tacala LLC | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:HotelsRestaurantsAndLeisureSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:HouseholdDurablesSectorMember2026-03-310002082557Anova Buyer, Inc. | One stop 12026-03-310002082557Anova Buyer, Inc. | One stop 22026-03-310002082557Anova Buyer, Inc. | One stop 32026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:IndustrialConglomeratesSectorMember2026-03-310002082557Acrisure, LLC | Senior secured2026-03-310002082557Alera Group, Inc. | Senior secured2026-03-310002082557Captive Resources Midco, LLC | One stop 12026-03-310002082557Captive Resources Midco, LLC | One stop 22026-03-310002082557Disco Parent | Senior secured2026-03-310002082557Galway Borrower LLC | One stop 12026-03-310002082557Galway Borrower LLC | One stop 22026-03-310002082557Galway Borrower LLC | One stop 32026-03-310002082557Galway Borrower LLC | One stop 42026-03-310002082557Galway Borrower LLC | One stop 52026-03-310002082557J.S. Held Holdings, LLC | One stop 12026-03-310002082557J.S. Held Holdings, LLC | One stop 22026-03-310002082557J.S. Held Holdings, LLC | One stop 32026-03-310002082557OneDigital Borrower LLC | Senior secured2026-03-310002082557Pareto Health Intermediate Holdings, Inc. | One stop 12026-03-310002082557Pareto Health Intermediate Holdings, Inc. | One stop 22026-03-310002082557Pareto Health Intermediate Holdings, Inc. | One stop 32026-03-310002082557People Corporation | One stop 12026-03-310002082557People Corporation | One stop 22026-03-310002082557People Corporation | One stop 32026-03-310002082557People Corporation | One stop 42026-03-310002082557us-gaap:DebtSecuritiesMemberus-gaap:InsuranceSectorMember2026-03-310002082557Delinea Inc. | One stop 12026-03-310002082557Delinea Inc. | One stop 22026-03-310002082557KnowBe4 | Senior secured2026-03-310002082557ReliaQuest Holdings, LLC | One stop 12026-03-310002082557ReliaQuest Holdings, LLC | One stop 22026-03-310002082557ReliaQuest Holdings, LLC | One stop 32026-03-310002082557UKG Inc. | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:ITServicesSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:LeisureProductsSectorMember2026-03-310002082557PAS Parent Inc. | One stop 12026-03-310002082557PAS Parent Inc. | One stop 22026-03-310002082557PAS Parent Inc. | One stop 32026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:LifeSciencesToolsAndServicesSectorMember2026-03-310002082557Wireco Worldgroup Inc. | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:MachinerySectorMember2026-03-310002082557Project Nike Purchaser, LLC | One stop 12026-03-310002082557Project Nike Purchaser, LLC | One stop 22026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:MarineSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:MediaSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:PersonalProductsMember2026-03-310002082557Avalara, Inc. | Senior secured2026-03-310002082557Citrin Cooperman Advisors LLC | Senior secured2026-03-310002082557Dawn Bidco, LLC | Senior secured2026-03-310002082557Denali Intermediate Holdings, Inc. | One stop 12026-03-310002082557Denali Intermediate Holdings, Inc. | One stop 22026-03-310002082557Geosyntec Consultants, Inc. | Senior secured2026-03-310002082557Grant Thornton Advisors, LLC | Senior secured2026-03-310002082557Outcomes Group Holdings, Inc. | Senior secured2026-03-310002082557Teaching Company, The | Senior secured 12026-03-310002082557Teaching Company, The | Senior secured 22026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:ProfessionalServicesSectorMember2026-03-310002082557Inhabit IQ Inc. | One stop 12026-03-310002082557Inhabit IQ Inc. | One stop 22026-03-310002082557Inhabit IQ Inc. | One stop 32026-03-310002082557MRI Software, LLC | One stop 12026-03-310002082557MRI Software, LLC | One stop 22026-03-310002082557MRI Software, LLC | One stop 32026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:RealEstateManagementAndDevelopmentSectorMember2026-03-310002082557Kenan Advantage Group, Inc. | Senior secured2026-03-310002082557VRS Buyer, Inc. | Senior secured 12026-03-310002082557VRS Buyer, Inc. | Senior secured 22026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:RoadAndRailMember2026-03-310002082557Appfire Technologies, LLC | One stop 12026-03-310002082557Appfire Technologies, LLC | One stop 22026-03-310002082557Bayshore Intermediate #2, L.P. | One stop 12026-03-310002082557Bayshore Intermediate #2, L.P. | One stop 22026-03-310002082557Bottomline Technologies, Inc. | One stop2026-03-310002082557ConnectWise, LLC | Senior secured2026-03-310002082557Cyberswift | Senior secured2026-03-310002082557Diligent Corporation | One stop 12026-03-310002082557Diligent Corporation | One stop 22026-03-310002082557Diligent Corporation | One stop 32026-03-310002082557Diligent Corporation | One stop 42026-03-310002082557ECI Macola/Max Holding, LLC | Senior secured2026-03-310002082557Epicor Software Corporation | Senior secured2026-03-310002082557GS Acquisitionco, Inc. | One stop 12026-03-310002082557GS Acquisitionco, Inc. | One stop 22026-03-310002082557GS Acquisitionco, Inc. | One stop 32026-03-310002082557Hyland Software, Inc. | One stop 12026-03-310002082557Hyland Software, Inc. | One stop 22026-03-310002082557Instructure Holdings, Inc. | Senior secured2026-03-310002082557iSolved, Inc. | Senior secured2026-03-310002082557Javelin Buyer, Inc. | Senior secured2026-03-310002082557Jawbreaker Parent, Inc. | One stop 12026-03-310002082557Jawbreaker Parent, Inc. | One stop 22026-03-310002082557Jawbreaker Parent, Inc. | One stop 32026-03-310002082557Jawbreaker Parent, Inc. | One stop 42026-03-310002082557Modena Buyer, LLC | Senior secured2026-03-310002082557Obelix Parent, Inc. | One stop 12026-03-310002082557Obelix Parent, Inc. | One stop 22026-03-310002082557Pineapple German Bidco GMBH | One stop 12026-03-310002082557Pineapple German Bidco GMBH | One stop 22026-03-310002082557Pineapple German Bidco GMBH | One stop 32026-03-310002082557Pineapple German Bidco GMBH | One stop 42026-03-310002082557PING Identity Holding Corp. | Senior secured2026-03-310002082557Proofpoint, Inc. | Senior secured2026-03-310002082557Relativity Intermediate Holdco, LLC | Senior secured2026-03-310002082557Riskonnect Parent, LLC | One stop 12026-03-310002082557Riskonnect Parent, LLC | One stop 22026-03-310002082557Sapphire Bidco Oy | One stop2026-03-310002082557Striim, Inc. | One stop2026-03-310002082557Togetherwork Holdings, LLC | One stop 12026-03-310002082557Togetherwork Holdings, LLC | One stop 22026-03-310002082557Togetherwork Holdings, LLC | One stop 32026-03-310002082557Trintech, Inc. | One stop 12026-03-310002082557Trintech, Inc. | One stop 22026-03-310002082557Trintech, Inc. | One stop 32026-03-310002082557Viper Bidco, Inc. | One stop 12026-03-310002082557Viper Bidco, Inc. | One stop 22026-03-310002082557Viper Bidco, Inc. | One stop 32026-03-310002082557Viper Bidco, Inc. | One stop 42026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:SoftwareSectorMember2026-03-310002082557Ashco, LLC | Senior secured2026-03-310002082557Med Parentco, LP | Senior secured2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:SpecialtyRetailSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:TransportationInfrastructureSectorMember2026-03-310002082557S.J. Electro Systems, LLC | Senior secured 12026-03-310002082557S.J. Electro Systems, LLC | Senior secured 22026-03-310002082557S.J. Electro Systems, LLC | Senior secured 32026-03-310002082557us-gaap:DebtSecuritiesMembergpifs:WaterUtilitiesSectorMember2026-03-310002082557us-gaap:DebtSecuritiesMember2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:AutomobilesSectorMember2026-03-310002082557BECO Holding Company, Inc. | Preferred stock2026-03-310002082557BECO Holding Company, Inc. | LP interest2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:BuildingProductsSectorMember2026-03-310002082557CI (Quercus) Intermediate Holdings, LLC | LP interest2026-03-310002082557PT Intermediate Holdings III, LLC | LLC interest2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:CommercialServicesAndSuppliesSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMemberus-gaap:ContainerAndPackagingSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:DiversifiedConsumerServicesSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:FoodAndStaplesRetailingSectorMember2026-03-310002082557CCSL Holdings, LLC | LP interest2026-03-310002082557Centegix Intermediate II, LLC | LLC interest2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:HealthcareEquipmentAndSuppliesSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:HealthcareProvidersAndServicesSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:HotelsRestaurantsAndLeisureSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:IndustrialConglomeratesSectorMember2026-03-310002082557PAS Parent Inc. | LP interest 12026-03-310002082557PAS Parent Inc. | LP interest 22026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:LifeSciencesToolsAndServicesSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:RealEstateManagementAndDevelopmentSectorMember2026-03-310002082557Bayshore Intermediate #2, L.P. | LP interest2026-03-310002082557Claroty, Ltd. | Preferred stock2026-03-310002082557Diligent Corporation | Preferred stock 12026-03-310002082557Diligent Corporation | Preferred stock 22026-03-310002082557GS Acquisitionco, Inc. | Preferred stock 12026-03-310002082557GS Acquisitionco, Inc. | LP interest2026-03-310002082557GS Acquisitionco, Inc. | Preferred stock 22026-03-310002082557GS Acquisitionco, Inc. | Preferred stock 32026-03-310002082557Riskonnect Parent, LLC | LP interest2026-03-310002082557Riskonnect Parent, LLC | Preferred stock 12026-03-310002082557Riskonnect Parent, LLC | Preferred stock 22026-03-310002082557Riskonnect Parent, LLC | Preferred stock 32026-03-310002082557Striim, Inc. | Warrant2026-03-310002082557Togetherwork Holdings, LLC | LP interest2026-03-310002082557us-gaap:EquitySecuritiesMembergpifs:SoftwareSectorMember2026-03-310002082557us-gaap:EquitySecuritiesMember2026-03-310002082557Morgan Stanley Institutional Liquidity Funds - Treasury Portfolio Institutional Share Class (CUSIP 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OF CONTENTS](#i622bdf63dfcf4efc91ae9727eebccfdb_13)\n\n______________________________________________________________________________________________________\n\nUNITED STATES\n\nSECURITIES AND EXCHANGE COMMISSION\n\nWASHINGTON, DC 20549\n\n______________________________________________________________________________________________________ \n\nFORM 10-Q\n\nþ                 QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF\n\nTHE SECURITIES EXCHANGE ACT OF 1934\n\nFor the Quarterly Period Ended March 31, 2026\n\nOR\n\no         TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF\n\nTHE SECURITIES EXCHANGE ACT OF 1934\n\nFor the transition period from _____ to _____\n\nCommission File Number 814-01945\n\nGolub Capital Private Income Fund S\n\n(Exact name of registrant as specified in its charter)\n\nDelaware39-3613464\n\n(State or other jurisdiction of incorporation or organization)  (I.R.S. Employer Identification No.)\n\n200 Park Avenue, 25th Floor\n\nNew York, NY 10166\n\n(Address of principal executive offices)\n\n(212) 750-6060\n\n(Registrant's telephone number, including area code)\n\nSecurities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:\n\nTitle of each classTrading SymbolName of each exchange on which registered\n\nNoneNoneNone\n\nIndicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes þ   No o\n\nIndicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).   Yes ☑ No   o\n\nIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.\n\n☐\nLarge accelerated filer\n☐\nAccelerated filer\n\n☑\nNon-accelerated filer\n☐\nSmaller reporting company\n\n☑Emerging growth company\n\nIf an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o\n\nIndicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  o  No þ\n\nAs of May 15, 2026, the Registrant had 4,754,156 common shares of beneficial interest, $0.01 par value, outstanding. Common shares of beneficial interest outstanding exclude May 1, 2026 subscriptions since the offering price is not yet finalized at this time.\n\n1\n\n[TABLE OF CONTENTS](#i622bdf63dfcf4efc91ae9727eebccfdb_13)\n\nPart I. Financial Information"}