000139644012-312023Q3falseP5YP3YP3YP5Y0.6700013964402023-01-012023-09-3000013964402023-11-01xbrli:shares0001396440us-gaap:InvestmentAffiliatedIssuerControlledMember2023-09-30iso4217:USD0001396440us-gaap:InvestmentAffiliatedIssuerControlledMember2022-12-310001396440us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-09-300001396440us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-12-310001396440us-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001396440us-gaap:InvestmentUnaffiliatedIssuerMember2022-12-3100013964402023-09-3000013964402022-12-310001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2023-09-300001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2022-12-310001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2022-12-310001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2023-09-300001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2022-12-310001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2023-09-300001396440us-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2023-09-300001396440us-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2022-12-310001396440main:December2025NotesMemberus-gaap:UnsecuredDebtMember2023-09-300001396440main:December2025NotesMemberus-gaap:UnsecuredDebtMember2022-12-31iso4217:USDxbrli:shares0001396440us-gaap:InvestmentAffiliatedIssuerControlledMember2023-07-012023-09-300001396440us-gaap:InvestmentAffiliatedIssuerControlledMember2022-07-012022-09-300001396440us-gaap:InvestmentAffiliatedIssuerControlledMember2023-01-012023-09-300001396440us-gaap:InvestmentAffiliatedIssuerControlledMember2022-01-012022-09-300001396440us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-07-012023-09-300001396440us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-07-012022-09-300001396440us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-01-012023-09-300001396440us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-01-012022-09-300001396440us-gaap:InvestmentUnaffiliatedIssuerMember2023-07-012023-09-300001396440us-gaap:InvestmentUnaffiliatedIssuerMember2022-07-012022-09-300001396440us-gaap:InvestmentUnaffiliatedIssuerMember2023-01-012023-09-300001396440us-gaap:InvestmentUnaffiliatedIssuerMember2022-01-012022-09-3000013964402023-07-012023-09-3000013964402022-07-012022-09-3000013964402022-01-012022-09-300001396440us-gaap:CommonStockMember2021-12-310001396440us-gaap:AdditionalPaidInCapitalMember2021-12-310001396440us-gaap:RetainedEarningsMember2021-12-3100013964402021-12-310001396440us-gaap:CommonStockMember2022-01-012022-03-310001396440us-gaap:AdditionalPaidInCapitalMember2022-01-012022-03-3100013964402022-01-012022-03-310001396440us-gaap:RetainedEarningsMember2022-01-012022-03-310001396440us-gaap:CommonStockMember2022-03-310001396440us-gaap:AdditionalPaidInCapitalMember2022-03-310001396440us-gaap:RetainedEarningsMember2022-03-3100013964402022-03-310001396440us-gaap:CommonStockMember2022-04-012022-06-300001396440us-gaap:AdditionalPaidInCapitalMember2022-04-012022-06-3000013964402022-04-012022-06-300001396440us-gaap:RetainedEarningsMember2022-04-012022-06-300001396440us-gaap:CommonStockMember2022-06-300001396440us-gaap:AdditionalPaidInCapitalMember2022-06-300001396440us-gaap:RetainedEarningsMember2022-06-3000013964402022-06-300001396440us-gaap:CommonStockMember2022-07-012022-09-300001396440us-gaap:AdditionalPaidInCapitalMember2022-07-012022-09-300001396440us-gaap:RetainedEarningsMember2022-07-012022-09-300001396440us-gaap:CommonStockMember2022-09-300001396440us-gaap:AdditionalPaidInCapitalMember2022-09-300001396440us-gaap:RetainedEarningsMember2022-09-3000013964402022-09-300001396440us-gaap:CommonStockMember2022-12-310001396440us-gaap:AdditionalPaidInCapitalMember2022-12-310001396440us-gaap:RetainedEarningsMember2022-12-310001396440us-gaap:CommonStockMember2023-01-012023-03-310001396440us-gaap:AdditionalPaidInCapitalMember2023-01-012023-03-3100013964402023-01-012023-03-310001396440us-gaap:RetainedEarningsMember2023-01-012023-03-310001396440us-gaap:CommonStockMember2023-03-310001396440us-gaap:AdditionalPaidInCapitalMember2023-03-310001396440us-gaap:RetainedEarningsMember2023-03-3100013964402023-03-310001396440us-gaap:CommonStockMember2023-04-012023-06-300001396440us-gaap:AdditionalPaidInCapitalMember2023-04-012023-06-3000013964402023-04-012023-06-300001396440us-gaap:RetainedEarningsMember2023-04-012023-06-300001396440us-gaap:CommonStockMember2023-06-300001396440us-gaap:AdditionalPaidInCapitalMember2023-06-300001396440us-gaap:RetainedEarningsMember2023-06-3000013964402023-06-300001396440us-gaap:CommonStockMember2023-07-012023-09-300001396440us-gaap:AdditionalPaidInCapitalMember2023-07-012023-09-300001396440us-gaap:RetainedEarningsMember2023-07-012023-09-300001396440us-gaap:CommonStockMember2023-09-300001396440us-gaap:AdditionalPaidInCapitalMember2023-09-300001396440us-gaap:RetainedEarningsMember2023-09-300001396440main:December2025NotesMember2023-01-012023-09-300001396440main:December2025NotesMember2022-01-012022-09-300001396440main:SBICDebenturesMember2023-01-012023-09-300001396440main:SBICDebenturesMember2022-01-012022-09-300001396440Analytical Systems Keco Holdings, LLC, Secured Debt 12023-09-30xbrli:pure0001396440Analytical Systems Keco Holdings, LLC, Secured Debt 22023-09-300001396440Analytical Systems Keco Holdings, LLC, Preferred Member Units 12023-09-300001396440Analytical Systems Keco Holdings, LLC, Preferred Member Units 22023-09-300001396440Analytical Systems Keco Holdings, LLC, Warrants2023-09-300001396440main:AnalyticalSystemsKecoHoldingsLLCMember2023-09-300001396440ASC Interests, LLC, Secured Debt 12023-09-300001396440ASC Interests, LLC, Secured Debt 22023-09-300001396440ASC Interests, LLC, Member Units2023-09-300001396440ASC Interests, LLC, Preferred Member Units2023-09-300001396440main:ASCInterestsLLCMember2023-09-300001396440ATS Workholding, LLC, Secured Debt 12023-09-300001396440ATS Workholding, LLC, Secured Debt 22023-09-300001396440ATS Workholding, LLC, Preferred Member Units2023-09-300001396440main:ATSWorkholdingLLCMember2023-09-300001396440Barfly Ventures, LLC, Secured Debt2023-09-300001396440Barfly Ventures, LLC, Member Units2023-09-300001396440main:BarflyVenturesLLCMember2023-09-300001396440Batjer TopCo, LLC, Secured Debt 12023-09-300001396440Batjer TopCo, LLC, Secured Debt 22023-09-300001396440Batjer TopCo, LLC, Secured Debt 32023-09-300001396440Batjer TopCo, LLC, Preferred Stock2023-09-300001396440main:BatjerTopCoLLCMember2023-09-300001396440Bolder Panther Group, LLC, Secured Debt2023-09-300001396440Bolder Panther Group, LLC, Class B Preferred Member Units2023-09-300001396440main:BolderPantherGroupLLCMember2023-09-300001396440Brewer Crane Holdings, LLC, Secured Debt2023-09-300001396440Brewer Crane Holdings, LLC, Preferred Member Units2023-09-300001396440main:BrewerCraneHoldingsLLCMember2023-09-300001396440Bridge Capital Solutions Corporation, Secured Debt 12023-09-300001396440Bridge Capital Solutions Corporation, Secured Debt 22023-09-300001396440Bridge Capital Solutions Corporation, Preferred Member Units 22023-09-300001396440Bridge Capital Solutions Corporation, Warrants2023-09-300001396440main:BridgeCapitalSolutionsCorporationMember2023-09-300001396440Café Brazil, LLC, Member Units2023-09-300001396440California Splendor Holdings LLC, Secured Debt2023-09-300001396440California Splendor Holdings LLC, Preferred Member Units 12023-09-300001396440California Splendor Holdings LLC, Preferred Member Units 22023-09-300001396440main:CaliforniaSplendorHoldingsLLCMember2023-09-300001396440CBT Nuggets, LLC, Member Units2023-09-300001396440Centre Technologies Holdings, LLC, Secured Debt 12023-09-300001396440Centre Technologies Holdings, LLC, Secured Debt 22023-09-300001396440Centre Technologies Holdings, LLC, Preferred Member Units2023-09-300001396440main:CentreTechnologiesHoldingsLLCMember2023-09-300001396440Chamberlin Holding LLC, Secured Debt 12023-09-300001396440Chamberlin Holding LLC, Secured Debt 22023-09-300001396440Chamberlin Holding LLC, Member Units 12023-09-300001396440Chamberlin Holding LLC, Member Units 22023-09-300001396440main:ChamberlinHoldingLLCMember2023-09-300001396440Charps, LLC, Unsecured Debt2023-09-300001396440Charps, LLC, Preferred Member Units2023-09-300001396440main:CharpsLLCMember2023-09-300001396440Clad-Rex Steel, LLC, Secured Debt 12023-09-300001396440Clad-Rex Steel, LLC, Secured Debt 22023-09-300001396440Clad-Rex Steel, LLC, Secured Debt 32023-09-300001396440Clad-Rex Steel, LLC, Member Units 12023-09-300001396440Clad-Rex Steel, LLC, Member Units 22023-09-300001396440main:CladRexSteelLLCMember2023-09-300001396440Cody Pools, Inc., Secured Debt 12023-09-300001396440Cody Pools, Inc., Secured Debt 22023-09-300001396440Cody Pools, Inc., Preferred Member Units2023-09-300001396440main:CodyPoolsIncMember2023-09-300001396440Colonial Electric Company LLC, Secured Debt 12023-09-300001396440Colonial Electric Company LLC, Secured Debt 22023-09-300001396440Colonial Electric Company LLC, Preferred Member Units 12023-09-300001396440Colonial Electric Company LLC, Preferred Member Units 22023-09-300001396440main:ColonialElectricCompanyLLCMember2023-09-300001396440CompareNetworks Topco, LLC, Secured Debt2023-09-300001396440CompareNetworks Topco, LLC, Preferred Member Units2023-09-300001396440main:CompareNetworksTopcoLLCMember2023-09-300001396440Copper Trail Fund Investments, LP Interests (CTMH, LP)2023-09-300001396440Cybermedia Technologies, LLC, Secured Debt 12023-09-300001396440Cybermedia Technologies, LLC, Secured Debt 22023-09-300001396440Cybermedia Technologies, LLC, Preferred Member Units2023-09-300001396440main:CybermediaTechnologiesLLCMember2023-09-300001396440Datacom, LLC, Secured Debt 12023-09-300001396440Datacom, LLC, Secured Debt 22023-09-300001396440Datacom, LLC, Preferred Member Units2023-09-300001396440main:DatacomLLCMember2023-09-300001396440Digital Products Holdings LLC, Secured Debt2023-09-300001396440Digital Products Holdings LLC, Preferred Member Units2023-09-300001396440main:DigitalProductsHoldingsLLCMember2023-09-300001396440Direct Marketing Solutions, Inc., Secured Debt 12023-09-300001396440Direct Marketing Solutions, Inc., Secured Debt 22023-09-300001396440Direct Marketing Solutions, Inc., Preferred Stock2023-09-300001396440main:DirectMarketingSolutionsIncMember2023-09-300001396440Elgin AcquireCo, LLC, Secured Debt 12023-09-300001396440Elgin AcquireCo, LLC, Secured Debt 22023-09-300001396440Elgin AcquireCo, LLC, Secured Debt 32023-09-300001396440Elgin AcquireCo, LLC, Common Stock 12023-09-300001396440Elgin AcquireCo, LLC, Common Stock 22023-09-300001396440main:ElginAcquireCoLLCMember2023-09-300001396440Gamber-Johnson Holdings, LLC, Secured Debt 12023-09-300001396440Gamber-Johnson Holdings, LLC, Secured Debt 22023-09-300001396440Gamber-Johnson Holdings, LLC, Member Units2023-09-300001396440main:GamberJohnsonHoldingsLLCMember2023-09-300001396440Garreco, LLC, Secured Debt2023-09-300001396440Garreco, LLC, Member Units2023-09-300001396440main:GarrecoLLCMember2023-09-300001396440GRT Rubber Technologies LLC, Secured Debt 12023-09-300001396440GRT Rubber Technologies LLC, Secured Debt 22023-09-300001396440GRT Rubber Technologies LLC, Member Units2023-09-300001396440main:GRTRubberTechnologiesLLCMember2023-09-300001396440Gulf Manufacturing, LLC, Member Units2023-09-300001396440Gulf Publishing Holdings, LLC, Secured Debt 12023-09-300001396440Gulf Publishing Holdings, LLC, Secured Debt 22023-09-300001396440Gulf Publishing Holdings, LLC, Preferred Equity2023-09-300001396440Gulf Publishing Holdings, LLC, Member Units2023-09-300001396440main:GulfPublishingHoldingsLLCMember2023-09-300001396440Harris Preston Fund Investments, LP Interests (2717 MH, L.P.)2023-09-300001396440Harris Preston Fund Investments, LP Interests (2717 HPP-MS, L.P.)2023-09-300001396440main:HarrisPrestonFundInvestmentsOneMember2023-09-300001396440Harrison Hydra-Gen, Ltd., Common Stock2023-09-300001396440IG Investor, LLC, Secured Debt 12023-09-300001396440IG Investor, LLC, Secured Debt 22023-09-300001396440IG Investor, LLC, Common Equity2023-09-300001396440main:IGInvestorLLCMember2023-09-300001396440Independent Pet Partners Intermediate Holdings, LLC, Common Equity2023-09-300001396440Jensen Jewelers of Idaho, LLC, Secured Debt 12023-09-300001396440Jensen Jewelers of Idaho, LLC, Secured Debt 22023-09-300001396440Jensen Jewelers of Idaho, LLC, Member Units2023-09-300001396440main:JensenJewelersOfIdahoLLCMember2023-09-300001396440Johnson Downie Opco, LLC, Secured Debt 12023-09-300001396440Johnson Downie Opco, LLC, Secured Debt 22023-09-300001396440Johnson Downie Opco, LLC, Preferred Equity2023-09-300001396440main:JohnsonDownieOpcoLLCMember2023-09-300001396440JorVet Holdings, LLC, Secured Debt2023-09-300001396440JorVet Holdings, LLC, Preferred Equity2023-09-300001396440main:JorVetHoldingsLLCMember2023-09-300001396440KBK Industries, LLC, Secured Debt2023-09-300001396440KBK Industries, LLC, Member Units2023-09-300001396440main:KBKIndustriesLLCMember2023-09-300001396440Kickhaefer Manufacturing Company, LLC, Secured Debt 12023-09-300001396440Kickhaefer Manufacturing Company, LLC, Secured Debt 22023-09-300001396440Kickhaefer Manufacturing Company, LLC, Preferred Equity2023-09-300001396440Kickhaefer Manufacturing Company, LLC, Member Units2023-09-300001396440main:KickhaeferManufacturingCompanyLLCMember2023-09-300001396440MetalForming Holding, LLC, Secured Debt 12023-09-300001396440MetalForming Holding, LLC, Secured Debt 22023-09-300001396440MetalForming Holding, LLC, Preferred Equity2023-09-300001396440MetalForming Holding, LLC, Common Stock2023-09-300001396440main:MetalFormingHoldingLLCMember2023-09-300001396440MH Corbin Holding LLC, Secured Debt2023-09-300001396440MH Corbin Holding LLC, Preferred Member Units 12023-09-300001396440MH Corbin Holding LLC, Preferred Member Units 22023-09-300001396440main:MHCorbinHoldingLLCMember2023-09-300001396440MS Private Loan Fund I, LP, Secured Debt2023-09-300001396440MS Private Loan Fund I, LP, LP Interests2023-09-300001396440main:MSPrivateLoanFundILPMember2023-09-300001396440MS Private Loan Fund II, LP, Secured Debt2023-09-300001396440MS Private Loan Fund II, LP, Interests2023-09-300001396440main:MSPrivateLoanFundIILPMember2023-09-300001396440MSC Adviser I, LLC, Member Units2023-09-300001396440MSC Income Fund, Inc., Common Equity2023-09-300001396440Mystic Logistics Holdings, LLC, Secured Debt 12023-09-300001396440Mystic Logistics Holdings, LLC, Secured Debt 22023-09-300001396440Mystic Logistics Holdings, LLC, Common Stock2023-09-300001396440main:MysticLogisticsHoldingsLLCMember2023-09-300001396440NAPCO Precast, LLC, Member Units2023-09-300001396440Nebraska Vet AcquireCo, LLC, Secured Debt 12023-09-300001396440Nebraska Vet AcquireCo, LLC, Secured Debt 22023-09-300001396440Nebraska Vet AcquireCo, LLC, Preferred Member Units2023-09-300001396440main:NebraskaVetAcquireCoLLCMember2023-09-300001396440NexRev LLC, Secured Debt 12023-09-300001396440NexRev LLC, Secured Debt 22023-09-300001396440NexRev LLC, Preferred Member Units2023-09-300001396440main:NexRevLLCMember2023-09-300001396440NRP Jones, LLC, Secured Debt2023-09-300001396440NRP Jones, LLC, Member Units 12023-09-300001396440NRP Jones, LLC, Member Units 22023-09-300001396440main:NRPJonesLLCMember2023-09-300001396440NuStep, LLC, Secured Debt 12023-09-300001396440NuStep, LLC, Secured Debt 22023-09-300001396440NuStep, LLC, Preferred Member Units 12023-09-300001396440NuStep, LLC, Preferred Member Units 22023-09-300001396440main:NuStepLLCMember2023-09-300001396440OMi Topco, LLC, Secured Debt2023-09-300001396440OMi Topco, LLC, Preferred Member Units2023-09-300001396440main:OMiTopcoLLCMember2023-09-300001396440Orttech Holdings, LLC, Secured Debt 12023-09-300001396440Orttech Holdings, LLC, Secured Debt 22023-09-300001396440Orttech Holdings, LLC, Preferred Stock2023-09-300001396440main:OrttechHoldingsLLCMember2023-09-300001396440Pearl Meyer Topco LLC, Secured Debt 12023-09-300001396440Pearl Meyer Topco LLC, Secured Debt 22023-09-300001396440Pearl Meyer Topco LLC, Secured Debt 32023-09-300001396440Pearl Meyer Topco LLC, Preferred Equity2023-09-300001396440main:PearlMeyerTopcoLLCMember2023-09-300001396440PPL RVs, Inc., Secured Debt 12023-09-300001396440PPL RVs, Inc., Secured Debt 22023-09-300001396440PPL RVs, Inc., Common Stock 12023-09-300001396440PPL RVs, Inc., Common Stock 22023-09-300001396440main:PPLRVsIncMember2023-09-300001396440Principle Environmental, LLC, Secured Debt2023-09-300001396440Principle Environmental, LLC, Preferred Member Units2023-09-300001396440Principle Environmental, LLC, Common Stock2023-09-300001396440main:PrincipleEnvironmentalLLCMember2023-09-300001396440Quality Lease Service, LLC, Member Units2023-09-300001396440River Aggregates, LLC, Member Units2023-09-300001396440Robbins Bros. Jewelry, Inc., Secured Debt 12023-09-300001396440Robbins Bros. Jewelry, Inc., Secured Debt 22023-09-300001396440Robbins Bros. Jewelry, Inc., Preferred Equity2023-09-300001396440main:RobbinsBrosJewelryIncMember2023-09-300001396440Tedder Industries, LLC, Secured Debt 12023-09-300001396440Tedder Industries, LLC, Secured Debt 22023-09-300001396440Tedder Industries, LLC, Preferred Member Units 12023-09-300001396440Tedder Industries, LLC, Preferred Member Units 22023-09-300001396440Tedder Industries, LLC, Preferred Member Units 32023-09-300001396440main:TedderIndustriesLLCMember2023-09-300001396440Televerde, LLC, Member Units2023-09-300001396440Televerde, LLC, Preferred Stock2023-09-300001396440main:TeleverdeLLCMember2023-09-300001396440Trantech Radiator Topco, LLC, Secured Debt 12023-09-300001396440Trantech Radiator Topco, LLC, Secured Debt 22023-09-300001396440Trantech Radiator Topco, LLC, Common Stock2023-09-300001396440main:TrantechRadiatorTopcoLLCMember2023-09-300001396440UnionRock Energy Fund III, LP, LP Interests2023-09-300001396440Vision Interests, Inc., Series A Preferred Stock2023-09-300001396440Volusion, LLC, Secured Debt2023-09-300001396440Volusion, LLC, Preferred Member Units 12023-09-300001396440Volusion, LLC, Preferred Member Units 22023-09-300001396440Volusion, LLC, Preferred Member Units 32023-09-300001396440Volusion, LLC, Common Stock2023-09-300001396440main:VolusionLLCMember2023-09-300001396440VVS Holdco LLC, Secured Debt 12023-09-300001396440VVS Holdco LLC, Secured Debt 22023-09-300001396440VVS Holdco LLC, Preferred Equity2023-09-300001396440main:VVSHoldcoLLCMember2023-09-300001396440Ziegler’s NYPD, LLC, Secured Debt 12023-09-300001396440Ziegler’s NYPD, LLC, Secured Debt 22023-09-300001396440Ziegler’s NYPD, LLC, Secured Debt 32023-09-300001396440Ziegler’s NYPD, LLC, Preferred Member Units2023-09-300001396440Ziegler’s NYPD, LLC, Warrants2023-09-300001396440main:ZieglersNYPDLLCMember2023-09-300001396440AAC Holdings, Inc., Secured Debt 12023-09-300001396440AAC Holdings, Inc., Secured Debt 22023-09-300001396440AAC Holdings, Inc., Common Stock2023-09-300001396440AAC Holdings, Inc., Warrants2023-09-300001396440main:AACHoldingsIncMember2023-09-300001396440BBB Tank Services, LLC, Unsecured Debt 12023-09-300001396440BBB Tank Services, LLC, Unsecured Debt 22023-09-300001396440BBB Tank Services, LLC, Member Units2023-09-300001396440BBB Tank Services, LLC, Preferred Stock (non-voting)2023-09-300001396440main:BBBTankServicesLLCMember2023-09-300001396440Boccella Precast Products LLC, Secured Debt2023-09-300001396440Boccella Precast Products LLC, Member Units2023-09-300001396440main:BoccellaPrecastProductsLLCMember2023-09-300001396440Buca C, LLC, Secured Debt2023-09-300001396440Buca C, LLC, Preferred Member Units2023-09-300001396440main:BucaCLLCMember2023-09-300001396440Career Team Holdings, LLC, Secured Debt 12023-09-300001396440Career Team Holdings, LLC, Secured Debt 22023-09-300001396440Career Team Holdings, LLC, Common Stock2023-09-300001396440main:CareerTeamHoldingsLLCMember2023-09-300001396440Classic H&G Holdings, LLC, Secured Debt 12023-09-300001396440Classic H&G Holdings, LLC, Secured Debt 22023-09-300001396440Classic H&G Holdings, LLC, Preferred Member Units2023-09-300001396440main:ClassicHGHoldingsLLCMember2023-09-300001396440Congruent Credit Opportunities Funds, LP Interests (Congruent Credit Opportunities Fund III, LP)2023-09-300001396440DMA Industries, LLC, Secured Debt2023-09-300001396440DMA Industries, LLC, Preferred Equity2023-09-300001396440main:DMAIndustriesLLCMember2023-09-300001396440Dos Rios Partners, LP Interests (Dos Rios Partners, LP)2023-09-300001396440Dos Rios Partners, LP Interests (Dos Rios Partners - A, LP)2023-09-300001396440main:DosRiosPartnersMember2023-09-300001396440Dos Rios Stone Products LLC, Class A Preferred Units2023-09-300001396440EIG Fund Investments, LP Interests (EIG Global Private Debt Fund-A, L.P.)2023-09-300001396440Flame King Holdings, LLC, Preferred Equity2023-09-300001396440Freeport Financial Funds, LP Interests (Freeport Financial SBIC Fund LP)2023-09-300001396440Freeport Financial Funds, LP Interests (Freeport First Lien Loan Fund III LP)2023-09-300001396440main:FreeportFinancialFundsMember2023-09-300001396440GFG Group, LLC, Secured Debt2023-09-300001396440GFG Group, LLC, Preferred Member Units2023-09-300001396440main:GFGGroupLLCMember2023-09-300001396440Harris Preston Fund Investments, LP Interests (HPEP 3, L.P.)2023-09-300001396440Harris Preston Fund Investments, LP Interests (HPEP 4, L.P.)2023-09-300001396440Harris Preston Fund Investments, LP Interests (423 COR, L.P.)2023-09-300001396440Harris Preston Fund Investments, LP Interests (423 HAR, L.P.)2023-09-300001396440main:HarrisPrestonFundInvestmentsTwoMember2023-09-300001396440Hawk Ridge Systems, LLC, Secured Debt 12023-09-300001396440Hawk Ridge Systems, LLC, Secured Debt 22023-09-300001396440Hawk Ridge Systems, LLC, Preferred Member Units 12023-09-300001396440Hawk Ridge Systems, LLC, Preferred Member Units 22023-09-300001396440main:HawkRidgeSystemsLLCMember2023-09-300001396440Houston Plating and Coatings, LLC, Unsecured Convertible Debt2023-09-300001396440Houston Plating and Coatings, LLC, Member Units2023-09-300001396440main:HoustonPlatingAndCoatingsLLCMember2023-09-300001396440I-45 SLF LLC, Member Units (Fully diluted 20.0%; 21.75% profits interest)2023-09-300001396440Infinity X1 Holdings, LLC, Secured Debt2023-09-300001396440Infinity X1 Holdings, LLC, Preferred Equity2023-09-300001396440main:InfinityX1HoldingsLLCMember2023-09-300001396440Integral Energy Services, Secured Debt2023-09-300001396440Integral Energy Services, Common Stock2023-09-300001396440main:IntegralEnergyServicesMember2023-09-300001396440Iron-Main Investments, LLC, Secured Debt 12023-09-300001396440Iron-Main Investments, LLC, Secured Debt 22023-09-300001396440Iron-Main Investments, LLC, Secured Debt 32023-09-300001396440Iron-Main Investments, LLC, Secured Debt 42023-09-300001396440Iron-Main Investments, LLC, Secured Debt 52023-09-300001396440Iron-Main Investments, LLC, Common Stock2023-09-300001396440main:IronMainInvestmentsLLCMember2023-09-300001396440ITA Holdings Group, LLC, Secured Debt 12023-09-300001396440ITA Holdings Group, LLC, Secured Debt 22023-09-300001396440ITA Holdings Group, LLC, Secured Debt 32023-09-300001396440ITA Holdings Group, LLC, Secured Debt 42023-09-300001396440ITA Holdings Group, LLC, Warrants2023-09-300001396440main:ITAHoldingsGroupLLCMember2023-09-300001396440OnAsset Intelligence, Inc., Secured Debt 12023-09-300001396440OnAsset Intelligence, Inc., Secured Debt 22023-09-300001396440OnAsset Intelligence, Inc., Secured Debt 32023-09-300001396440OnAsset Intelligence, Inc., Secured Debt 42023-09-300001396440OnAsset Intelligence, Inc., Unsecured Debt2023-09-300001396440OnAsset Intelligence, Inc., Preferred Stock2023-09-300001396440OnAsset Intelligence, Inc., Common Stock2023-09-300001396440OnAsset Intelligence, Inc., Warrants2023-09-300001396440main:OnAssetIntelligenceIncMember2023-09-300001396440Oneliance, LLC, Secured Debt 12023-09-300001396440Oneliance, LLC, Secured Debt 22023-09-300001396440Oneliance, LLC, Preferred Stock2023-09-300001396440main:OnelianceLLCMember2023-09-300001396440Rocaceia, LLC (Quality Lease and Rental Holdings, LLC), Preferred Member Units2023-09-300001396440SI East, LLC, Secured Debt 12023-09-300001396440SI East, LLC, Secured Debt 22023-09-300001396440SI East, LLC, Preferred Member Units2023-09-300001396440main:SIEastLLCMember2023-09-300001396440Slick Innovations, LLC, Secured Debt2023-09-300001396440Slick Innovations, LLC, Common Stock2023-09-300001396440main:SlickInnovationsLLCMember2023-09-300001396440Student Resource Center, LLC, Secured Debt2023-09-300001396440Student Resource Center, LLC, Preferred Equity2023-09-300001396440main:StudentResourceCenterLLCMember2023-09-300001396440Superior Rigging & Erecting Co., Secured Debt2023-09-300001396440Superior Rigging & Erecting Co., Preferred Member Units2023-09-300001396440main:SuperiorRiggingErectingCoMember2023-09-300001396440The Affiliati Network, LLC, Secured Debt 12023-09-300001396440The Affiliati Network, LLC, Secured Debt 22023-09-300001396440The Affiliati Network, LLC, Preferred Stock 12023-09-300001396440The Affiliati Network, LLC, Preferred Stock 22023-09-300001396440main:TheAffiliatiNetworkLLCMember2023-09-300001396440UnionRock Energy Fund II, LP, LP Interests2023-09-300001396440UniTek Global Services, Inc., Secured Convertible Debt 12023-09-300001396440UniTek Global Services, Inc., Secured Convertible Debt 22023-09-300001396440UniTek Global Services, Inc., Preferred Stock 12023-09-300001396440UniTek Global Services, Inc., Preferred Stock 22023-09-300001396440UniTek Global Services, Inc., Preferred Stock 32023-09-300001396440UniTek Global Services, Inc., Preferred Stock 42023-09-300001396440UniTek Global Services, Inc., Common Stock2023-09-300001396440main:UniTekGlobalServicesIncMember2023-09-300001396440Universal Wellhead Services Holdings, LLC, Preferred Member Units2023-09-300001396440Universal Wellhead Services Holdings, LLC, Member Units2023-09-300001396440main:UniversalWellheadServicesHoldingsLLCMember2023-09-300001396440World Micro Holdings, LLC, Secured Debt2023-09-300001396440World Micro Holdings, LLC, Preferred Equity2023-09-300001396440main:WorldMicroHoldingsLLCMember2023-09-300001396440AB Centers Acquisition Corporation, Secured Debt 12023-09-300001396440AB Centers Acquisition Corporation, Secured Debt 22023-09-300001396440AB Centers Acquisition Corporation, Secured Debt 32023-09-300001396440AB Centers Acquisition Corporation, Secured Debt 42023-09-300001396440main:ABCentersAcquisitionCorporationMember2023-09-300001396440Acousti Engineering Company of Florida, Secured Debt 12023-09-300001396440Acousti Engineering Company of Florida, Secured Debt 22023-09-300001396440Acousti Engineering Company of Florida, Secured Debt 32023-09-300001396440main:AcoustiEngineeringCompanyOfFloridaMember2023-09-300001396440Acumera, Inc., Secured Debt 12023-09-300001396440Acumera, Inc., Secured Debt 22023-09-300001396440Acumera, Inc., Warrants2023-09-300001396440main:AcumeraIncMember2023-09-300001396440Adams Publishing Group, LLC, Secured Debt 12023-09-300001396440Adams Publishing Group, LLC, Secured Debt 22023-09-300001396440main:AdamsPublishingGroupLLCMember2023-09-300001396440ADS Tactical, Inc., Secured Debt2023-09-300001396440AMEREQUIP LLC., Secured Debt 12023-09-300001396440AMEREQUIP LLC., Secured Debt 22023-09-300001396440AMEREQUIP LLC., Common Stock2023-09-300001396440main:AMEREQUIPLLCMember2023-09-300001396440American Health Staffing Group, Inc., Secured Debt 12023-09-300001396440American Health Staffing Group, Inc., Secured Debt 22023-09-300001396440main:AmericanHealthStaffingGroupIncMember2023-09-300001396440American Nuts, LLC, Secured Debt 12023-09-300001396440American Nuts, LLC, Secured Debt 22023-09-300001396440American Nuts, LLC, Secured Debt 32023-09-300001396440American Nuts, LLC, Secured Debt 42023-09-300001396440main:AmericanNutsLLCMember2023-09-300001396440American Teleconferencing Services, Ltd., Secured Debt 12023-09-300001396440American Teleconferencing Services, Ltd., Secured Debt 22023-09-300001396440main:AmericanTeleconferencingServicesLtdMember2023-09-300001396440ArborWorks, LLC, Secured Debt 12023-09-300001396440ArborWorks, LLC, Secured Debt 22023-09-300001396440ArborWorks, LLC, Common Equity2023-09-300001396440main:ArborWorksLLCMember2023-09-300001396440Archer Systems, LLC, Secured Debt 12023-09-300001396440Archer Systems, LLC, Secured Debt 22023-09-300001396440Archer Systems, LLC, Common Stock2023-09-300001396440main:ArcherSystemsLLCMember2023-09-300001396440ATS Operating, LLC, Secured Debt 12023-09-300001396440ATS Operating, LLC, Secured Debt 22023-09-300001396440ATS Operating, LLC, Secured Debt 32023-09-300001396440ATS Operating, LLC, Common Stock2023-09-300001396440main:ATSOperatingLLCMember2023-09-300001396440AVEX Aviation Holdings, LLC, Secured Debt 12023-09-300001396440AVEX Aviation Holdings, LLC, Secured Debt 22023-09-300001396440AVEX Aviation Holdings, LLC, Common Equity2023-09-300001396440main:AVEXAviationHoldingsLLCMember2023-09-300001396440Berry Aviation, Inc., Preferred Member Units 12023-09-300001396440Berry Aviation, Inc., Preferred Member Units 22023-09-300001396440main:BerryAviationIncMember2023-09-300001396440Bettercloud, Inc., Secured Debt 12023-09-300001396440Bettercloud, Inc., Secured Debt 22023-09-300001396440main:BettercloudIncMember2023-09-300001396440Binswanger Enterprises, LLC, Member Units2023-09-300001396440Bluestem Brands, Inc., Secured Debt 12023-09-300001396440Bluestem Brands, Inc., Secured Debt 22023-09-300001396440Bluestem Brands, Inc., Common Stock2023-09-300001396440Bluestem Brands, Inc., Warrants2023-09-300001396440main:BluestemBrandsIncMember2023-09-300001396440Bond Brand Loyalty ULC, Secured Debt 12023-09-300001396440Bond Brand Loyalty ULC, Secured Debt 22023-09-300001396440Bond Brand Loyalty ULC, Secured Debt 32023-09-300001396440Bond Brand Loyalty ULC, Common Equity2023-09-300001396440main:BondBrandLoyaltyULCMember2023-09-300001396440Brainworks Software, LLC, Secured Debt 12023-09-300001396440Brainworks Software, LLC, Secured Debt 22023-09-300001396440main:BrainworksSoftwareLLCMember2023-09-300001396440Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund III, LP)2023-09-300001396440Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund IV, LP)2023-09-300001396440Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund V, LP)2023-09-300001396440main:BrightwoodCapitalFundInvestmentsMember2023-09-300001396440Burning Glass Intermediate Holding Company, Inc., Secured Debt 12023-09-300001396440Burning Glass Intermediate Holding Company, Inc., Secured Debt 22023-09-300001396440main:BurningGlassIntermediateHoldingCompanyIncMember2023-09-300001396440Cadence Aerospace LLC, Secured Debt 12023-09-300001396440Cadence Aerospace LLC, Secured Debt 22023-09-300001396440Cadence Aerospace LLC, Secured Debt 32023-09-300001396440Cadence Aerospace LLC, Secured Debt 42023-09-300001396440Cadence Aerospace LLC, Secured Debt 52023-09-300001396440main:CadenceAerospaceLLCMember2023-09-300001396440CAI Software LLC, Preferred Equity 12023-09-300001396440CAI Software LLC, Preferred Equity 22023-09-300001396440main:CAISoftwareLLCMember2023-09-300001396440Camin Cargo Control, Inc., Secured Debt2023-09-300001396440CaseWorthy, Inc., Secured Debt 12023-09-300001396440CaseWorthy, Inc., Secured Debt 22023-09-300001396440CaseWorthy, Inc., Secured Debt 32023-09-300001396440CaseWorthy, Inc., Common Equity2023-09-300001396440main:CaseWorthyIncMember2023-09-300001396440Channel Partners Intermediateco, LLC, Secured Debt 12023-09-300001396440Channel Partners Intermediateco, LLC, Secured Debt 22023-09-300001396440Channel Partners Intermediateco, LLC, Secured Debt 32023-09-300001396440Channel Partners Intermediateco, LLC, Secured Debt 42023-09-300001396440main:ChannelPartnersIntermediatecoLLCMember2023-09-300001396440Clarius BIGS, LLC, Secured Debt2023-09-300001396440Computer Data Source, LLC, Secured Debt 12023-09-300001396440Computer Data Source, LLC, Secured Debt 22023-09-300001396440main:ComputerDataSourceLLCMember2023-09-300001396440Construction Supply Investments, LLC, Member Units2023-09-300001396440Dalton US Inc., Secured Debt 12023-09-300001396440Dalton US Inc., Secured Debt 22023-09-300001396440Dalton US Inc., Secured Debt 32023-09-300001396440Dalton US Inc., Common Stock2023-09-300001396440main:DaltonUSIncMember2023-09-300001396440DTE Enterprises, LLC, Class A Preferred Member Units2023-09-300001396440DTE Enterprises, LLC, Class AA Preferred Member Units (non-voting)2023-09-300001396440main:DTEEnterprisesLLCMember2023-09-300001396440Dynamic Communities, LLC, Secured Debt 12023-09-300001396440Dynamic Communities, LLC, Secured Debt 22023-09-300001396440Dynamic Communities, LLC, Preferred Equity 12023-09-300001396440Dynamic Communities, LLC, Preferred Equity 22023-09-300001396440Dynamic Communities, LLC, Common Equity2023-09-300001396440main:DynamicCommunitiesLLCMember2023-09-300001396440Eastern Wholesale Fence LLC, Secured Debt 12023-09-300001396440Eastern Wholesale Fence LLC, Secured Debt 22023-09-300001396440Eastern Wholesale Fence LLC, Secured Debt 32023-09-300001396440Eastern Wholesale Fence LLC, Secured Debt 4 2023-09-300001396440Eastern Wholesale Fence LLC, Secured Debt 52023-09-300001396440main:EasternWholesaleFenceLLCMember2023-09-300001396440Emerald Technologies Acquisition Co, Inc., Secured Debt2023-09-300001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund VIII, L.P.)2023-09-300001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund VIII Co-Investors, L.P.)2023-09-300001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund IX, L.P.)2023-09-300001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund X, L.P.)2023-09-300001396440EnCap Energy Fund Investments, LP Interests (EnCap Flatrock Midstream Fund II, L.P.)2023-09-300001396440EnCap Energy Fund Investments, LP Interests (EnCap Flatrock Midstream Fund III, L.P.)2023-09-300001396440main:EnCapEnergyFundInvestmentsMember2023-09-300001396440Engineering Research & Consulting, LLC, Secured Debt 12023-09-300001396440Engineering Research & Consulting, LLC, Secured Debt 22023-09-300001396440main:EngineeringResearchConsultingLLCMember2023-09-300001396440Escalent, Inc., Secured Debt 12023-09-300001396440Escalent, Inc., Secured Debt 22023-09-300001396440Escalent, Inc., Common Equity2023-09-300001396440main:EscalentIncMember2023-09-300001396440Event Holdco, LLC, Secured Debt 12023-09-300001396440Event Holdco, LLC, Secured Debt 22023-09-300001396440main:EventHoldcoLLCMember2023-09-300001396440Flip Electronics LLC, Secured Debt 12023-09-300001396440Flip Electronics LLC, Secured Debt 22023-09-300001396440Flip Electronics LLC, Secured Debt 32023-09-300001396440main:FlipElectronicsLLCMember2023-09-300001396440Fuse, LLC, Secured Debt2023-09-300001396440Fuse, LLC, Common Stock2023-09-300001396440main:FuseLLCMember2023-09-300001396440GeoStabilization International (GSI), Secured Debt2023-09-300001396440GS HVAM Intermediate, LLC, Secured Debt 12023-09-300001396440GS HVAM Intermediate, LLC, Secured Debt 22023-09-300001396440GS HVAM Intermediate, LLC, Secured Debt 32023-09-300001396440GS HVAM Intermediate, LLC, Secured Debt 42023-09-300001396440main:GSHVAMIntermediateLLCMember2023-09-300001396440GULF PACIFIC ACQUISITION, LLC, Secured Debt 12023-09-300001396440GULF PACIFIC ACQUISITION, LLC, Secured Debt 22023-09-300001396440GULF PACIFIC ACQUISITION, LLC, Secured Debt 32023-09-300001396440main:GULFPACIFICACQUISITIONLLCMember2023-09-300001396440HDC/HW Intermediate Holdings, Secured Debt 12023-09-300001396440HDC/HW Intermediate Holdings, Secured Debt 22023-09-300001396440main:HDCHWIntermediateHoldingsMember2023-09-300001396440HEADLANDS OP-CO LLC, Secured Debt 12023-09-300001396440HEADLANDS OP-CO LLC, Secured Debt 22023-09-300001396440HEADLANDS OP-CO LLC, Secured Debt 32023-09-300001396440main:HEADLANDSOPCOLLCMember2023-09-300001396440HOWLCO LLC, Secured Debt2023-09-300001396440Hybrid Promotions, LLC, Secured Debt2023-09-300001396440IG Parent Corporation, Secured Debt 12023-09-300001396440IG Parent Corporation, Secured Debt 22023-09-300001396440IG Parent Corporation, Secured Debt 3 2023-09-300001396440main:IGParentCorporationMember2023-09-300001396440Imaging Business Machines, L.L.C., Secured Debt 12023-09-300001396440Imaging Business Machines, L.L.C., Secured Debt 22023-09-300001396440Imaging Business Machines, L.L.C., Common Equity2023-09-300001396440main:ImagingBusinessMachinesLLCMember2023-09-300001396440Implus Footcare, LLC, Secured Debt2023-09-300001396440Industrial Services Acquisition, LLC, Secured Debt 12023-09-300001396440Industrial Services Acquisition, LLC, Secured Debt 22023-09-300001396440Industrial Services Acquisition, LLC, Preferred Member Units 12023-09-300001396440Industrial Services Acquisition, LLC, Preferred Member Units 22023-09-300001396440Industrial Services Acquisition, LLC, Member Units2023-09-300001396440main:IndustrialServicesAcquisitionLLCMember2023-09-300001396440Infolinks Media Buyco, LLC, Secured Debt 12023-09-300001396440Infolinks Media Buyco, LLC, Secured Debt 22023-09-300001396440main:InfolinksMediaBuycoLLCMember2023-09-300001396440Insight Borrower Corporation, Secured Debt 12023-09-300001396440Insight Borrower Corporation, Secured Debt 22023-09-300001396440Insight Borrower Corporation, Secured Debt 32023-09-300001396440Insight Borrower Corporation, Common Equity2023-09-300001396440main:InsightBorrowerCorporationMember2023-09-300001396440Inspire Aesthetics Management, LLC, Secured Debt 12023-09-300001396440Inspire Aesthetics Management, LLC, Secured Debt 22023-09-300001396440Inspire Aesthetics Management, LLC, Secured Debt 32023-09-300001396440Inspire Aesthetics Management, LLC, Common Equity2023-09-300001396440main:InspireAestheticsManagementLLCMember2023-09-300001396440Interface Security Systems, L.L.C, Secured Debt 12023-09-300001396440Interface Security Systems, L.L.C, Secured Debt 22023-09-300001396440Interface Security Systems, L.L.C, Common Stock2023-09-300001396440main:InterfaceSecuritySystemsLLCMember2023-09-300001396440Intermedia Holdings, Inc., Secured Debt2023-09-300001396440Invincible Boat Company, LLC., Secured Debt 12023-09-300001396440Invincible Boat Company, LLC., Secured Debt 22023-09-300001396440main:InvincibleBoatCompanyLLCMember2023-09-300001396440INW Manufacturing, LLC, Secured Debt2023-09-300001396440Isagenix International, LLC, Secured Debt2023-09-300001396440Isagenix International, LLC, Common Equity2023-09-300001396440main:IsagenixInternationalLLCMember2023-09-300001396440Jackmont Hospitality, Inc., Secured Debt 12023-09-300001396440Jackmont Hospitality, Inc., Secured Debt 22023-09-300001396440Jackmont Hospitality, Inc., Preferred Equity2023-09-300001396440main:JackmontHospitalityIncMember2023-09-300001396440Joerns Healthcare, LLC, Secured Debt 12023-09-300001396440Joerns Healthcare, LLC, Secured Debt 22023-09-300001396440Joerns Healthcare, LLC, Secured Debt 32023-09-300001396440Joerns Healthcare, LLC, Common Stock2023-09-300001396440main:JoernsHealthcareLLCMember2023-09-300001396440JTI Electrical & Mechanical, LLC, Secured Debt 12023-09-300001396440JTI Electrical & Mechanical, LLC, Secured Debt 22023-09-300001396440JTI Electrical & Mechanical, LLC, Common Equity2023-09-300001396440main:JTIElectricalMechanicalLLCMember2023-09-300001396440KMS, LLC, Secured Debt 12023-09-300001396440KMS, LLC, Secured Debt 22023-09-300001396440main:KMSLLCMember2023-09-300001396440Kore Wireless Group Inc., Secured Debt2023-09-300001396440Lightbox Holdings, L.P., Secured Debt2023-09-300001396440LKCM Headwater Investments I, L.P., LP Interests2023-09-300001396440LL Management, Inc., Secured Debt 12023-09-300001396440LL Management, Inc., Secured Debt 22023-09-300001396440LL Management, Inc., Secured Debt 32023-09-300001396440LL Management, Inc., Secured Debt 42023-09-300001396440LL Management, Inc., Secured Debt 52023-09-300001396440main:LLManagementIncMember2023-09-300001396440LLFlex, LLC, Secured Debt2023-09-300001396440Logix Acquisition Company, LLC, Secured Debt2023-09-300001396440Looking Glass Investments, LLC, Member Units2023-09-300001396440Mako Steel, LP, Secured Debt 12023-09-300001396440Mako Steel, LP, Secured Debt 22023-09-300001396440main:MakoSteelLPMember2023-09-300001396440MB2 Dental Solutions, LLC, Secured Debt 12023-09-300001396440MB2 Dental Solutions, LLC, Secured Debt 22023-09-300001396440MB2 Dental Solutions, LLC, Secured Debt 32023-09-300001396440MB2 Dental Solutions, LLC, Secured Debt 42023-09-300001396440main:MB2DentalSolutionsLLCMember2023-09-300001396440Microbe Formulas, LLC, Secured Debt 12023-09-300001396440Microbe Formulas, LLC, Secured Debt 22023-09-300001396440main:MicrobeFormulasLLCMember2023-09-300001396440Mills Fleet Farm Group, LLC, Secured Debt2023-09-300001396440MonitorUS Holding, LLC, Secured Debt 12023-09-300001396440MonitorUS Holding, LLC, Secured Debt 22023-09-300001396440MonitorUS Holding, LLC, Secured Debt 32023-09-300001396440MonitorUS Holding, LLC, Common Stock2023-09-300001396440main:MonitorUSHoldingLLCMember2023-09-300001396440NBG Acquisition Inc, Secured Debt2023-09-300001396440NinjaTrader, LLC, Secured Debt 12023-09-300001396440NinjaTrader, LLC, Secured Debt 22023-09-300001396440NinjaTrader, LLC, Secured Debt 32023-09-300001396440main:NinjaTraderLLCMember2023-09-300001396440NTM Acquisition Corp., Secured Debt2023-09-300001396440NWN Corporation, Secured Debt 12023-09-300001396440NWN Corporation, Secured Debt 22023-09-300001396440NWN Corporation, Secured Debt 32023-09-300001396440main:NWNCorporationMember2023-09-300001396440Obra Capital, Inc, Secured Debt2023-09-300001396440Ospemifene Royalty Sub LLC, Secured Debt2023-09-300001396440Paragon Healthcare, Inc., Secured Debt 12023-09-300001396440Paragon Healthcare, Inc., Secured Debt 22023-09-300001396440Paragon Healthcare, Inc., Secured Debt 32023-09-300001396440main:ParagonHealthcareIncMember2023-09-300001396440Power System Solutions, Secured Debt 12023-09-300001396440Power System Solutions, Secured Debt 22023-09-300001396440Power System Solutions, Secured Debt 32023-09-300001396440Power System Solutions, Common Equity2023-09-300001396440main:PowerSystemSolutionsMember2023-09-300001396440PrimeFlight Aviation Services, Secured Debt2023-09-300001396440Project Eagle Holdings, LLC, Secured Debt 12023-09-300001396440Project Eagle Holdings, LLC, Secured Debt 22023-09-300001396440main:ProjectEagleHoldingsLLCMember2023-09-300001396440PTL US Bidco, Inc, Secured Debt 12023-09-300001396440PTL US Bidco, Inc, Secured Debt 22023-09-300001396440main:PTLUSBidcoIncMember2023-09-300001396440RA Outdoors LLC, Secured Debt 12023-09-300001396440RA Outdoors LLC, Secured Debt 22023-09-300001396440main:RAOutdoorsLLCMember2023-09-300001396440Research Now Group, Inc. and Survey Sampling International, LLC, Secured Debt2023-09-300001396440Richardson Sales Solutions, Secured Debt 12023-09-300001396440Richardson Sales Solutions, Secured Debt 22023-09-300001396440main:RichardsonSalesSolutionsMember2023-09-300001396440RM Bidder, LLC, Member Units2023-09-300001396440RM Bidder, LLC, Warrants2023-09-300001396440main:RMBidderLLCMember2023-09-300001396440Roof Opco, LLC, Secured Debt 12023-09-300001396440Roof Opco, LLC, Secured Debt 22023-09-300001396440Roof Opco, LLC, Secured Debt 32023-09-300001396440main:RoofOpcoLLCMember2023-09-300001396440RTIC Subsidiary Holdings, LLC, Secured Debt 12023-09-300001396440RTIC Subsidiary Holdings, LLC, Secured Debt 22023-09-300001396440RTIC Subsidiary Holdings, LLC, Secured Debt 32023-09-300001396440main:RTICSubsidiaryHoldingsLLCMember2023-09-300001396440Rug Doctor, LLC., Secured Debt 12023-09-300001396440Rug Doctor, LLC., Secured Debt 22023-09-300001396440main:RugDoctorLLCMember2023-09-300001396440SIB Holdings, LLC, Secured Debt 12023-09-300001396440SIB Holdings, LLC, Secured Debt 22023-09-300001396440SIB Holdings, LLC, Secured Debt 32023-09-300001396440SIB Holdings, LLC, Secured Debt 42023-09-300001396440SIB Holdings, LLC, Secured Debt 52023-09-300001396440SIB Holdings, LLC, Common Equity2023-09-300001396440main:SIBHoldingsLLCMember2023-09-300001396440South Coast Terminals Holdings, LLC, Secured Debt 12023-09-300001396440South Coast Terminals Holdings, LLC, Secured Debt 22023-09-300001396440South Coast Terminals Holdings, LLC, Common Equity2023-09-300001396440main:SouthCoastTerminalsHoldingsLLCMember2023-09-300001396440SPAU Holdings, LLC, Secured Debt 12023-09-300001396440SPAU Holdings, LLC, Secured Debt 22023-09-300001396440SPAU Holdings, LLC, Common Stock2023-09-300001396440main:SPAUHoldingsLLCMember2023-09-300001396440Stellant Systems, Inc., Secured Debt2023-09-300001396440Team Public Choices, LLC, Secured Debt2023-09-300001396440Tectonic Financial, LLC, Common Stock2023-09-300001396440Tex Tech Tennis, LLC, Preferred Equity2023-09-300001396440U.S. TelePacific Corp., Secured Debt 12023-09-300001396440U.S. TelePacific Corp., Secured Debt 22023-09-300001396440main:USTelePacificCorpMember2023-09-300001396440USA DeBusk LLC, Secured Debt 12023-09-300001396440USA DeBusk LLC, Secured Debt 22023-09-300001396440main:USADebuskLLCMember2023-09-300001396440UserZoom Technologies, Inc., Secured Debt2023-09-300001396440Veregy Consolidated, Inc., Secured Debt 12023-09-300001396440Veregy Consolidated, Inc., Secured Debt 22023-09-300001396440main:VeregyConsolidatedIncMember2023-09-300001396440Vistar Media, Inc., Preferred Stock2023-09-300001396440VORTEQ Coil Finishers, LLC, Common Equity2023-09-300001396440Wall Street Prep, Inc., Secured Debt 12023-09-300001396440Wall Street Prep, Inc., Secured Debt 22023-09-300001396440Wall Street Prep, Inc., Common Stock2023-09-300001396440main:WallStreetPrepIncMember2023-09-300001396440Watterson Brands, LLC, Secured Debt 12023-09-300001396440Watterson Brands, LLC, Secured Debt 22023-09-300001396440Watterson Brands, LLC, Secured Debt 32023-09-300001396440Watterson Brands, LLC, Secured Debt 42023-09-300001396440main:WattersonBrandsLLCMember2023-09-300001396440West Star Aviation Acquisition, LLC, Secured Debt 12023-09-300001396440West Star Aviation Acquisition, LLC, Secured Debt 22023-09-300001396440West Star Aviation Acquisition, LLC, Common Stock2023-09-300001396440main:WestStarAviationAcquisitionLLCMember2023-09-300001396440Winter Services LLC, Secured Debt 12023-09-300001396440Winter Services LLC, Secured Debt 22023-09-300001396440Winter Services LLC, Secured Debt 32023-09-300001396440main:WinterServicesLLCMember2023-09-300001396440Xenon Arc, Inc., Secured Debt 12023-09-300001396440Xenon Arc, Inc., Secured Debt 22023-09-300001396440Xenon Arc, Inc., Secured Debt 32023-09-300001396440main:XenonArcIncMember2023-09-300001396440YS Garments, LLC, Secured Debt2023-09-300001396440Zips Car Wash, LLC, Secured Debt 12023-09-300001396440Zips Car Wash, LLC, Secured Debt 22023-09-300001396440main:ZipsCarWashLLCMember2023-09-300001396440Dreyfus Government Cash Management2023-09-300001396440Fidelity Government Fund2023-09-300001396440Fidelity Treasury2023-09-300001396440us-gaap:MoneyMarketFundsMember2023-09-300001396440main:SecuredOvernightFinancingRateSOFROvernightIndexSwapRateOrLondonInterbankOfferedRateLIBORMembersrt:MinimumMember2023-09-300001396440srt:MaximumMembermain:SecuredOvernightFinancingRateSOFROvernightIndexSwapRateOrLondonInterbankOfferedRateLIBORMember2023-09-300001396440srt:WeightedAverageMembermain:SecuredOvernightFinancingRateSOFROvernightIndexSwapRateOrLondonInterbankOfferedRateLIBORMember2023-09-300001396440main:SecuredOvernightFinancingRateSOFRMembermain:BolderPantherGroupLLCMember2023-09-300001396440RM Bidder, LLC, Warrants2023-01-012023-09-300001396440srt:MinimumMember2023-09-300001396440srt:MaximumMember2023-09-300001396440main:SecuredOvernightFinancingRateSOFRMembermain:InterfaceSecuritySystemsLLCMember2023-09-300001396440main:SecuredOvernightFinancingRateSOFRMembermain:ChannelPartnersIntermediatecoLLCMember2023-09-300001396440main:ComputerDataSourceLLCMembermain:LondonInterbankOfferedRateLIBOR1Member2023-09-300001396440main:DaltonUSIncMembermain:SecuredOvernightFinancingRateSOFRMember2023-09-300001396440main:VariousInvestment1Membermain:SecuredOvernightFinancingRateSOFRMember2023-09-300001396440main:VariousInvestment1Member2023-09-300001396440main:IndustrialServicesAcquisitionLLCMembermain:SecuredOvernightFinancingRateSOFRMember2023-09-300001396440main:SecuredOvernightFinancingRateSOFRMembermain:ZipsCarWashLLCMember2023-09-300001396440main:SecuredOvernightFinancingRateSOFRMembermain:PTLUSBidcoIncMember2023-09-300001396440us-gaap:PrimeRateMembermain:PTLUSBidcoIncMember2023-09-300001396440main:SecuredOvernightFinancingRateSOFRMembermain:WattersonBrandsLLCMember2023-09-300001396440Acumera, Inc., Warrants2023-01-012023-09-300001396440Analytical Systems Keco Holdings, LLC, Secured Debt 12022-12-310001396440Analytical Systems Keco Holdings, LLC, Secured Debt 22022-12-310001396440Analytical Systems Keco Holdings, LLC, Preferred Member Units 12022-12-310001396440Analytical Systems Keco Holdings, LLC, Preferred Member Units 22022-12-310001396440Analytical Systems Keco Holdings, LLC, Warrants2022-12-310001396440main:AnalyticalSystemsKecoHoldingsLLCMember2022-12-310001396440ASC Interests, LLC, Secured Debt 12022-12-310001396440ASC Interests, LLC, Secured Debt 22022-12-310001396440ASC Interests, LLC, Member Units2022-12-310001396440main:ASCInterestsLLCMember2022-12-310001396440ATS Workholding, LLC, Secured Debt 12022-12-310001396440ATS Workholding, LLC, Secured Debt 22022-12-310001396440ATS Workholding, LLC, Preferred Member Units2022-12-310001396440main:ATSWorkholdingLLCMember2022-12-310001396440Barfly Ventures, LLC, Secured Debt2022-12-310001396440Barfly Ventures, LLC, Member Units2022-12-310001396440main:BarflyVenturesLLCMember2022-12-310001396440Batjer TopCo, LLC, Secured Debt 12022-12-310001396440Batjer TopCo, LLC, Secured Debt 22022-12-310001396440Batjer TopCo, LLC, Secured Debt 32022-12-310001396440Batjer TopCo, LLC, Preferred Stock2022-12-310001396440main:BatjerTopCoLLCMember2022-12-310001396440Bolder Panther Group, LLC, Secured Debt2022-12-310001396440Bolder Panther Group, LLC, Class B Preferred Member Units2022-12-310001396440main:BolderPantherGroupLLCMember2022-12-310001396440Brewer Crane Holdings, LLC, Secured Debt2022-12-310001396440Brewer Crane Holdings, LLC, Preferred Member Units2022-12-310001396440main:BrewerCraneHoldingsLLCMember2022-12-310001396440Bridge Capital Solutions Corporation, Secured Debt 12022-12-310001396440Bridge Capital Solutions Corporation, Secured Debt 22022-12-310001396440Bridge Capital Solutions Corporation, Preferred Member Units2022-12-310001396440Bridge Capital Solutions Corporation, Warrants2022-12-310001396440main:BridgeCapitalSolutionsCorporationMember2022-12-310001396440Café Brazil, LLC, Member Units2022-12-310001396440California Splendor Holdings LLC, Secured Debt2022-12-310001396440California Splendor Holdings LLC, Preferred Member Units 12022-12-310001396440California Splendor Holdings LLC, Preferred Member Units 22022-12-310001396440main:CaliforniaSplendorHoldingsLLCMember2022-12-310001396440CBT Nuggets, LLC, Member Units2022-12-310001396440Centre Technologies Holdings, LLC, Secured Debt 12022-12-310001396440Centre Technologies Holdings, LLC, Secured Debt 22022-12-310001396440Centre Technologies Holdings, LLC, Preferred Member Units2022-12-310001396440main:CentreTechnologiesHoldingsLLCMember2022-12-310001396440Chamberlin Holding LLC, Secured Debt 12022-12-310001396440Chamberlin Holding LLC, Secured Debt 22022-12-310001396440Chamberlin Holding LLC, Member Units 12022-12-310001396440Chamberlin Holding LLC, Member Units 22022-12-310001396440main:ChamberlinHoldingLLCMember2022-12-310001396440Charps, LLC, Unsecured Debt2022-12-310001396440Charps, LLC, Preferred Member Units2022-12-310001396440main:CharpsLLCMember2022-12-310001396440Clad-Rex Steel, LLC, Secured Debt 12022-12-310001396440Clad-Rex Steel, LLC, Secured Debt 22022-12-310001396440Clad-Rex Steel, LLC, Secured Debt 32022-12-310001396440Clad-Rex Steel, LLC, Member Units 12022-12-310001396440Clad-Rex Steel, LLC, Member Units 22022-12-310001396440main:CladRexSteelLLCMember2022-12-310001396440CMS Minerals Investments, Member Units2022-12-310001396440Cody Pools, Inc., Secured Debt 12022-12-310001396440Cody Pools, Inc., Secured Debt 22022-12-310001396440Cody Pools, Inc., Preferred Member Units2022-12-310001396440main:CodyPoolsIncMember2022-12-310001396440Colonial Electric Company LLC, Secured Debt 12022-12-310001396440Colonial Electric Company LLC, Secured Debt 22022-12-310001396440Colonial Electric Company LLC, Preferred Member Units2022-12-310001396440main:ColonialElectricCompanyLLCMember2022-12-310001396440CompareNetworks Topco, LLC, Secured Debt 12022-12-310001396440CompareNetworks Topco, LLC, Secured Debt 22022-12-310001396440CompareNetworks Topco, LLC, Preferred Member Units2022-12-310001396440main:CompareNetworksTopcoLLCMember2022-12-310001396440Copper Trail Fund Investments, LP Interests (CTMH, LP)2022-12-310001396440Datacom, LLC, Secured Debt 12022-12-310001396440Datacom, LLC, Secured Debt 22022-12-310001396440Datacom, LLC, Preferred Member Units2022-12-310001396440main:DatacomLLCMember2022-12-310001396440Digital Products Holdings LLC, Secured Debt2022-12-310001396440Digital Products Holdings LLC, Preferred Member Units2022-12-310001396440main:DigitalProductsHoldingsLLCMember2022-12-310001396440Direct Marketing Solutions, Inc., Secured Debt 12022-12-310001396440Direct Marketing Solutions, Inc., Secured Debt 22022-12-310001396440Direct Marketing Solutions, Inc., Preferred Stock2022-12-310001396440main:DirectMarketingSolutionsIncMember2022-12-310001396440Elgin AcquireCo, LLC, Secured Debt 12022-12-310001396440Elgin AcquireCo, LLC, Secured Debt 22022-12-310001396440Elgin AcquireCo, LLC, Secured Debt 32022-12-310001396440Elgin AcquireCo, LLC, Common Stock 12022-12-310001396440Elgin AcquireCo, LLC, Common Stock 22022-12-310001396440main:ElginAcquireCoLLCMember2022-12-310001396440Gamber-Johnson Holdings, LLC, Secured Debt 12022-12-310001396440Gamber-Johnson Holdings, LLC, Secured Debt 22022-12-310001396440Gamber-Johnson Holdings, LLC, Member Units2022-12-310001396440main:GamberJohnsonHoldingsLLCMember2022-12-310001396440Garreco, LLC, Secured Debt2022-12-310001396440Garreco, LLC, Member Units2022-12-310001396440main:GarrecoLLCMember2022-12-310001396440GRT Rubber Technologies LLC, Secured Debt 12022-12-310001396440GRT Rubber Technologies LLC, Secured Debt 22022-12-310001396440GRT Rubber Technologies LLC, Member Units2022-12-310001396440main:GRTRubberTechnologiesLLCMember2022-12-310001396440Gulf Manufacturing, LLC, Member Units2022-12-310001396440Gulf Publishing Holdings, LLC, Secured Debt 12022-12-310001396440Gulf Publishing Holdings, LLC, Secured Debt 22022-12-310001396440Gulf Publishing Holdings, LLC, Preferred Equity2022-12-310001396440Gulf Publishing Holdings, LLC, Member Units2022-12-310001396440main:GulfPublishingHoldingsLLCMember2022-12-310001396440Harris Preston Fund Investments, LP Interests (2717 MH, L.P.)2022-12-310001396440Harris Preston Fund Investments, LP Interests (2717 HPP-MS, L.P.)2022-12-310001396440main:HarrisPrestonFundInvestmentsOneMember2022-12-310001396440Harrison Hydra-Gen, Ltd., Common Stock2022-12-310001396440Jensen Jewelers of Idaho, LLC, Secured Debt 12022-12-310001396440Jensen Jewelers of Idaho, LLC, Secured Debt 22022-12-310001396440Jensen Jewelers of Idaho, LLC, Member Units2022-12-310001396440main:JensenJewelersOfIdahoLLCMember2022-12-310001396440Johnson Downie Opco, LLC, Secured Debt 12022-12-310001396440Johnson Downie Opco, LLC, Secured Debt 22022-12-310001396440Johnson Downie Opco, LLC, Preferred Equity2022-12-310001396440main:JohnsonDownieOpcoLLCMember2022-12-310001396440JorVet Holdings, LLC, Secured Debt2022-12-310001396440JorVet Holdings, LLC, Preferred Equity2022-12-310001396440main:JorVetHoldingsLLCMember2022-12-310001396440KBK Industries, LLC, Member Units2022-12-310001396440Kickhaefer Manufacturing Company, LLC, Secured Debt 12022-12-310001396440Kickhaefer Manufacturing Company, LLC, Secured Debt 22022-12-310001396440Kickhaefer Manufacturing Company, LLC, Preferred Equity2022-12-310001396440Kickhaefer Manufacturing Company, LLC, Member Units2022-12-310001396440main:KickhaeferManufacturingCompanyLLCMember2022-12-310001396440Market Force Information, LLC, Secured Debt 12022-12-310001396440Market Force Information, LLC, Secured Debt 22022-12-310001396440Market Force Information, LLC, Member Units2022-12-310001396440main:MarketForceInformationLLCMember2022-12-310001396440MetalForming AcquireCo, LLC, Secured Debt 12022-12-310001396440MetalForming AcquireCo, LLC, Secured Debt 22022-12-310001396440MetalForming AcquireCo, LLC, Preferred Equity2022-12-310001396440MetalForming AcquireCo, LLC, Common Stock2022-12-310001396440main:MetalFormingHoldingLLCMember2022-12-310001396440MH Corbin Holding LLC, Secured Debt2022-12-310001396440MH Corbin Holding LLC, Preferred Member Units 12022-12-310001396440MH Corbin Holding LLC, Preferred Member Units 22022-12-310001396440main:MHCorbinHoldingLLCMember2022-12-310001396440MS Private Loan Fund I, LP, Secured Debt2022-12-310001396440MS Private Loan Fund I, LP, LP Interests2022-12-310001396440main:MSPrivateLoanFundILPMember2022-12-310001396440MSC Adviser I, LLC, Member Units2022-12-310001396440MSC Income Fund, Inc., Common Equity2022-12-310001396440Mystic Logistics Holdings, LLC, Secured Debt 12022-12-310001396440Mystic Logistics Holdings, LLC, Secured Debt 22022-12-310001396440Mystic Logistics Holdings, LLC, Common Stock2022-12-310001396440main:MysticLogisticsHoldingsLLCMember2022-12-310001396440NAPCO Precast, LLC, Member Units2022-12-310001396440Nebraska Vet AcquireCo, LLC, Secured Debt 12022-12-310001396440Nebraska Vet AcquireCo, LLC, Secured Debt 22022-12-310001396440Nebraska Vet AcquireCo, LLC, Secured Debt 32022-12-310001396440Nebraska Vet AcquireCo, LLC, Preferred Member Units2022-12-310001396440main:NebraskaVetAcquireCoLLCMember2022-12-310001396440NexRev LLC, Secured Debt 12022-12-310001396440NexRev LLC, Secured Debt 22022-12-310001396440NexRev LLC, Preferred Member Units2022-12-310001396440main:NexRevLLCMember2022-12-310001396440NRP Jones, LLC, Secured Debt2022-12-310001396440NRP Jones, LLC, Member Units2022-12-310001396440main:NRPJonesLLCMember2022-12-310001396440NuStep, LLC, Secured Debt 12022-12-310001396440NuStep, LLC, Secured Debt 22022-12-310001396440NuStep, LLC, Preferred Member Units 12022-12-310001396440NuStep, LLC, Preferred Member Units 22022-12-310001396440main:NuStepLLCMember2022-12-310001396440OMi Topco, LLC, Secured Debt2022-12-310001396440OMi Topco, LLC, Preferred Member Units2022-12-310001396440main:OMiTopcoLLCMember2022-12-310001396440Orttech Holdings, LLC, Secured Debt 12022-12-310001396440Orttech Holdings, LLC, Secured Debt 22022-12-310001396440Orttech Holdings, LLC, Preferred Stock2022-12-310001396440main:OrttechHoldingsLLCMember2022-12-310001396440Pearl Meyer Topco LLC, Secured Debt 12022-12-310001396440Pearl Meyer Topco LLC, Secured Debt 22022-12-310001396440Pearl Meyer Topco LLC, Secured Debt 32022-12-310001396440Pearl Meyer Topco LLC, Preferred Equity2022-12-310001396440main:PearlMeyerTopcoLLCMember2022-12-310001396440PPL RVs, Inc., Secured Debt 12022-12-310001396440PPL RVs, Inc., Secured Debt 22022-12-310001396440PPL RVs, Inc., Common Stock 12022-12-310001396440PPL RVs, Inc., Common Stock 22022-12-310001396440main:PPLRVsIncMember2022-12-310001396440Principle Environmental, LLC, Secured Debt 12022-12-310001396440Principle Environmental, LLC, Secured Debt 22022-12-310001396440Principle Environmental, LLC, Preferred Member Units2022-12-310001396440Principle Environmental, LLC, Common Stock2022-12-310001396440main:PrincipleEnvironmentalLLCMember2022-12-310001396440Quality Lease Service, LLC, Member Units2022-12-310001396440River Aggregates, LLC, Member Units2022-12-310001396440Robbins Bros. Jewelry, Inc., Secured Debt 12022-12-310001396440Robbins Bros. Jewelry, Inc., Secured Debt 22022-12-310001396440Robbins Bros. Jewelry, Inc., Preferred Equity2022-12-310001396440main:RobbinsBrosJewelryIncMember2022-12-310001396440Tedder Industries, LLC, Secured Debt 12022-12-310001396440Tedder Industries, LLC, Secured Debt 22022-12-310001396440Tedder Industries, LLC, Preferred Member Units2022-12-310001396440main:TedderIndustriesLLCMember2022-12-310001396440Televerde, LLC, Member Units2022-12-310001396440Televerde, LLC, Preferred Stock2022-12-310001396440main:TeleverdeLLCMember2022-12-310001396440Trantech Radiator Topco, LLC, Secured Debt 12022-12-310001396440Trantech Radiator Topco, LLC, Secured Debt 22022-12-310001396440Trantech Radiator Topco, LLC, Common Stock2022-12-310001396440main:TrantechRadiatorTopcoLLCMember2022-12-310001396440Vision Interests, Inc., Series A Preferred Stock2022-12-310001396440VVS Holdco LLC, Secured Debt 12022-12-310001396440VVS Holdco LLC, Secured Debt 22022-12-310001396440VVS Holdco LLC, Preferred Equity2022-12-310001396440main:VVSHoldcoLLCMember2022-12-310001396440Ziegler’s NYPD, LLC, Secured Debt 12022-12-310001396440Ziegler’s NYPD, LLC, Secured Debt 22022-12-310001396440Ziegler’s NYPD, LLC, Secured Debt 32022-12-310001396440Ziegler’s NYPD, LLC, Preferred Member Units2022-12-310001396440Ziegler’s NYPD, LLC, Warrants2022-12-310001396440main:ZieglersNYPDLLCMember2022-12-310001396440AAC Holdings, Inc., Secured Debt2022-12-310001396440AAC Holdings, Inc., Common Stock2022-12-310001396440AAC Holdings, Inc., Warrants2022-12-310001396440main:AACHoldingsIncMember2022-12-310001396440AFG Capital Group, LLC, Preferred Member Units2022-12-310001396440ATX Networks Corp., Secured Debt2022-12-310001396440ATX Networks Corp., Unsecured Debt2022-12-310001396440ATX Networks Corp., Common Stock2022-12-310001396440main:ATXNetworksCorpMember2022-12-310001396440BBB Tank Services, LLC, Unsecured Debt 12022-12-310001396440BBB Tank Services, LLC, Unsecured Debt 22022-12-310001396440BBB Tank Services, LLC, Member Units2022-12-310001396440BBB Tank Services, LLC, Preferred Stock (non-voting)2022-12-310001396440main:BBBTankServicesLLCMember2022-12-310001396440Boccella Precast Products LLC, Secured Debt2022-12-310001396440Boccella Precast Products LLC, Member Units2022-12-310001396440main:BoccellaPrecastProductsLLCMember2022-12-310001396440Buca C, LLC, Secured Debt2022-12-310001396440Buca C, LLC, Preferred Member Units2022-12-310001396440main:BucaCLLCMember2022-12-310001396440Career Team Holdings, LLC, Secured Debt 12022-12-310001396440Career Team Holdings, LLC, Secured Debt 22022-12-310001396440Career Team Holdings, LLC, Common Stock2022-12-310001396440main:CareerTeamHoldingsLLCMember2022-12-310001396440Chandler Signs Holdings, LLC, Class A Units2022-12-310001396440Classic H&G Holdings, LLC, Secured Debt 12022-12-310001396440Classic H&G Holdings, LLC, Secured Debt 22022-12-310001396440Classic H&G Holdings, LLC, Preferred Member Units2022-12-310001396440main:ClassicHGHoldingsLLCMember2022-12-310001396440Congruent Credit Opportunities Funds, LP Interests (Congruent Credit Opportunities Fund III, LP)2022-12-310001396440DMA Industries, LLC, Secured Debt2022-12-310001396440DMA Industries, LLC, Preferred Equity2022-12-310001396440main:DMAIndustriesLLCMember2022-12-310001396440Dos Rios Partners, LP Interests (Dos Rios Partners, LP)2022-12-310001396440Dos Rios Partners, LP Interests (Dos Rios Partners - A, LP)2022-12-310001396440main:DosRiosPartnersMember2022-12-310001396440Dos Rios Stone Products LLC, Class A Preferred Units2022-12-310001396440EIG Fund Investments, LP Interests (EIG Global Private Debt Fund-A, L.P.)2022-12-310001396440Flame King Holdings, LLC, Secured Debt 12022-12-310001396440Flame King Holdings, LLC, Secured Debt 22022-12-310001396440Flame King Holdings, LLC, Preferred Equity2022-12-310001396440main:FlameKingHoldingsLLCMember2022-12-310001396440Freeport Financial Funds, LP Interests (Freeport Financial SBIC Fund LP)2022-12-310001396440Freeport Financial Funds, LP Interests (Freeport First Lien Loan Fund III LP)2022-12-310001396440main:FreeportFinancialFundsMember2022-12-310001396440GFG Group, LLC., Secured Debt2022-12-310001396440GFG Group, LLC., Preferred Member Units2022-12-310001396440main:GFGGroupLLCMember2022-12-310001396440Harris Preston Fund Investments, LP Interests (HPEP 3, L.P.)2022-12-310001396440Harris Preston Fund Investments, LP Interests (HPEP 4, L.P.)2022-12-310001396440Harris Preston Fund Investments, LP Interests (423 COR, LP)2022-12-310001396440main:HarrisPrestonFundInvestmentsTwoMember2022-12-310001396440Hawk Ridge Systems, LLC, Secured Debt 12022-12-310001396440Hawk Ridge Systems, LLC, Secured Debt 22022-12-310001396440Hawk Ridge Systems, LLC, Preferred Member Units 12022-12-310001396440Hawk Ridge Systems, LLC, Preferred Member Units 22022-12-310001396440main:HawkRidgeSystemsLLCMember2022-12-310001396440Houston Plating and Coatings, LLC, Unsecured Convertible Debt2022-12-310001396440Houston Plating and Coatings, LLC, Member Units2022-12-310001396440main:HoustonPlatingAndCoatingsLLCMember2022-12-310001396440I-45 SLF LLC, Member Units (Fully diluted 20.0%; 21.75% profits interest)2022-12-310001396440Iron-Main Investments, LLC, Secured Debt 12022-12-310001396440Iron-Main Investments, LLC, Secured Debt 22022-12-310001396440Iron-Main Investments, LLC, Secured Debt 32022-12-310001396440Iron-Main Investments, LLC, Secured Debt 42022-12-310001396440Iron-Main Investments, LLC, Common Stock2022-12-310001396440main:IronMainInvestmentsLLCMember2022-12-310001396440OnAsset Intelligence, Inc., Secured Debt 12022-12-310001396440OnAsset Intelligence, Inc., Secured Debt 22022-12-310001396440OnAsset Intelligence, Inc., Secured Debt 32022-12-310001396440OnAsset Intelligence, Inc., Secured Debt 42022-12-310001396440OnAsset Intelligence, Inc., Unsecured Debt2022-12-310001396440OnAsset Intelligence, Inc., Preferred Stock2022-12-310001396440OnAsset Intelligence, Inc., Common Stock2022-12-310001396440OnAsset Intelligence, Inc., Warrants2022-12-310001396440main:OnAssetIntelligenceIncMember2022-12-310001396440Oneliance, LLC, Secured Debt 12022-12-310001396440Oneliance, LLC, Secured Debt 22022-12-310001396440Oneliance, LLC, Preferred Stock2022-12-310001396440main:OnelianceLLCMember2022-12-310001396440Rocaceia, LLC (Quality Lease and Rental Holdings, LLC), Secured Debt2022-12-310001396440Rocaceia, LLC (Quality Lease and Rental Holdings, LLC), Preferred Member Units2022-12-310001396440main:RocaceiaLLCQualityLeaseAndRentalHoldingsLLCMember2022-12-310001396440SI East, LLC, Secured Debt 12022-12-310001396440SI East, LLC, Secured Debt 22022-12-310001396440SI East, LLC, Preferred Member Units2022-12-310001396440main:SIEastLLCMember2022-12-310001396440Slick Innovations, LLC, Secured Debt2022-12-310001396440Slick Innovations, LLC, Common Stock2022-12-310001396440main:SlickInnovationsLLCMember2022-12-310001396440Sonic Systems International, LLC, Secured Debt2022-12-310001396440Sonic Systems International, LLC, Common Stock2022-12-310001396440main:SonicSystemsInternationalLLCMember2022-12-310001396440Student Resource Center, LLC, Secured Debt2022-12-310001396440Student Resource Center, LLC, Preferred Equity2022-12-310001396440main:StudentResourceCenterLLCMember2022-12-310001396440Superior Rigging & Erecting Co., Secured Debt2022-12-310001396440Superior Rigging & Erecting Co., Preferred Member Units2022-12-310001396440main:SuperiorRiggingErectingCoMember2022-12-310001396440The Affiliati Network, LLC, Secured Debt 12022-12-310001396440The Affiliati Network, LLC, Secured Debt 22022-12-310001396440The Affiliati Network, LLC, Preferred Stock2022-12-310001396440main:TheAffiliatiNetworkLLCMember2022-12-310001396440UnionRock Energy Fund II, LP, LP Interests2022-12-310001396440UniTek Global Services, Inc., Secured Debt 12022-12-310001396440UniTek Global Services, Inc., Secured Debt 22022-12-310001396440UniTek Global Services, Inc., Secured Convertible Debt2022-12-310001396440UniTek Global Services, Inc., Preferred Stock 12022-12-310001396440UniTek Global Services, Inc., Preferred Stock 22022-12-310001396440UniTek Global Services, Inc., Preferred Stock 32022-12-310001396440UniTek Global Services, Inc., Preferred Stock 42022-12-310001396440UniTek Global Services, Inc., Common Stock2022-12-310001396440main:UniTekGlobalServicesIncMember2022-12-310001396440Universal Wellhead Services Holdings, LLC, Preferred Member Units2022-12-310001396440Universal Wellhead Services Holdings, LLC, Member Units2022-12-310001396440main:UniversalWellheadServicesHoldingsLLCMember2022-12-310001396440Volusion, LLC, Secured Debt2022-12-310001396440Volusion, LLC, Unsecured Convertible Debt2022-12-310001396440Volusion, LLC, Preferred Member Units2022-12-310001396440Volusion, LLC, Warrants2022-12-310001396440main:VolusionLLCMember2022-12-310001396440World Micro Holdings, LLC, Secured Debt2022-12-310001396440World Micro Holdings, LLC, Preferred Equity2022-12-310001396440main:WorldMicroHoldingsLLCMember2022-12-310001396440AB Centers Acquisition Corporation, Secured Debt 12022-12-310001396440AB Centers Acquisition Corporation, Secured Debt 22022-12-310001396440AB Centers Acquisition Corporation, Secured Debt 32022-12-310001396440main:ABCentersAcquisitionCorporationMember2022-12-310001396440Acousti Engineering Company of Florida, Secured Debt 12022-12-310001396440Acousti Engineering Company of Florida, Secured Debt 22022-12-310001396440Acousti Engineering Company of Florida, Secured Debt 32022-12-310001396440main:AcoustiEngineeringCompanyOfFloridaMember2022-12-310001396440Acumera, Inc., Secured Debt 12022-12-310001396440Acumera, Inc., Secured Debt 22022-12-310001396440main:AcumeraIncMember2022-12-310001396440Adams Publishing Group, LLC, Secured Debt 12022-12-310001396440Adams Publishing Group, LLC, Secured Debt 22022-12-310001396440main:AdamsPublishingGroupLLCMember2022-12-310001396440ADS Tactical, Inc., Secured Debt2022-12-310001396440AMEREQUIP LLC., Secured Debt 12022-12-310001396440AMEREQUIP LLC., Secured Debt 22022-12-310001396440AMEREQUIP LLC., Common Stock2022-12-310001396440main:AMEREQUIPLLCMember2022-12-310001396440American Health Staffing Group, Inc., Secured Debt 12022-12-310001396440American Health Staffing Group, Inc., Secured Debt 22022-12-310001396440main:AmericanHealthStaffingGroupIncMember2022-12-310001396440American Nuts, LLC, Secured Debt 12022-12-310001396440American Nuts, LLC, Secured Debt 22022-12-310001396440main:AmericanNutsLLCMember2022-12-310001396440American Teleconferencing Services, Ltd., Secured Debt 12022-12-310001396440American Teleconferencing Services, Ltd., Secured Debt 22022-12-310001396440main:AmericanTeleconferencingServicesLtdMember2022-12-310001396440ArborWorks, LLC, Secured Debt 12022-12-310001396440ArborWorks, LLC, Secured Debt 22022-12-310001396440ArborWorks, LLC, Common Equity2022-12-310001396440main:ArborWorksLLCMember2022-12-310001396440Archer Systems, LLC, Secured Debt 12022-12-310001396440Archer Systems, LLC, Secured Debt 22022-12-310001396440Archer Systems, LLC, Common Stock2022-12-310001396440main:ArcherSystemsLLCMember2022-12-310001396440Arrow International, Inc, Secured Debt2022-12-310001396440ATS Operating, LLC, Secured Debt 12022-12-310001396440ATS Operating, LLC, Secured Debt 22022-12-310001396440ATS Operating, LLC, Secured Debt 32022-12-310001396440ATS Operating, LLC, Common Stock2022-12-310001396440main:ATSOperatingLLCMember2022-12-310001396440AVEX Aviation Holdings, LLC, Secured Debt 12022-12-310001396440AVEX Aviation Holdings, LLC, Secured Debt 22022-12-310001396440AVEX Aviation Holdings, LLC, Common Equity2022-12-310001396440main:AVEXAviationHoldingsLLCMember2022-12-310001396440Berry Aviation, Inc., Secured Debt2022-12-310001396440Berry Aviation, Inc., Preferred Member Units 12022-12-310001396440Berry Aviation, Inc., Preferred Member Units 22022-12-310001396440main:BerryAviationIncMember2022-12-310001396440Bettercloud, Inc., Secured Debt 12022-12-310001396440Bettercloud, Inc., Secured Debt 22022-12-310001396440main:BettercloudIncMember2022-12-310001396440Binswanger Enterprises, LLC, Member Units2022-12-310001396440Bluestem Brands, Inc., Secured Debt 12022-12-310001396440Bluestem Brands, Inc., Secured Debt 22022-12-310001396440Bluestem Brands, Inc., Common Stock2022-12-310001396440Bluestem Brands, Inc., Warrants2022-12-310001396440main:BluestemBrandsIncMember2022-12-310001396440Brainworks Software, LLC, Secured Debt 12022-12-310001396440Brainworks Software, LLC, Secured Debt 22022-12-310001396440main:BrainworksSoftwareLLCMember2022-12-310001396440Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund III, LP)2022-12-310001396440Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund IV, LP)2022-12-310001396440Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund V, LP)2022-12-310001396440main:BrightwoodCapitalFundInvestmentsMember2022-12-310001396440Burning Glass Intermediate Holding Company, Inc., Secured Debt 12022-12-310001396440Burning Glass Intermediate Holding Company, Inc., Secured Debt 22022-12-310001396440main:BurningGlassIntermediateHoldingCompanyIncMember2022-12-310001396440Cadence Aerospace LLC, Secured Debt2022-12-310001396440CAI Software LLC, Preferred Equity 12022-12-310001396440CAI Software LLC, Preferred Equity 22022-12-310001396440main:CAISoftwareLLCMember2022-12-310001396440Camin Cargo Control, Inc., Secured Debt2022-12-310001396440CaseWorthy, Inc., Secured Debt 12022-12-310001396440CaseWorthy, Inc., Secured Debt 22022-12-310001396440CaseWorthy, Inc., Secured Debt 32022-12-310001396440CaseWorthy, Inc., Common Equity2022-12-310001396440main:CaseWorthyIncMember2022-12-310001396440Channel Partners Intermediateco, LLC, Secured Debt 12022-12-310001396440Channel Partners Intermediateco, LLC, Secured Debt 22022-12-310001396440main:ChannelPartnersIntermediatecoLLCMember2022-12-310001396440Clarius BIGS, LLC, Secured Debt2022-12-310001396440Computer Data Source, LLC, Secured Debt 12022-12-310001396440Computer Data Source, LLC, Secured Debt 22022-12-310001396440main:ComputerDataSourceLLCMember2022-12-310001396440Construction Supply Investments, LLC, Member Units2022-12-310001396440Dalton US Inc., Secured Debt 12022-12-310001396440Dalton US Inc., Secured Debt 22022-12-310001396440Dalton US Inc., Secured Debt 32022-12-310001396440Dalton US Inc., Common Stock2022-12-310001396440main:DaltonUSIncMember2022-12-310001396440DTE Enterprises, LLC, Secured Debt 12022-12-310001396440DTE Enterprises, LLC, Secured Debt 22022-12-310001396440DTE Enterprises, LLC, Class A Preferred Member Units2022-12-310001396440DTE Enterprises, LLC, Class AA Preferred Member Units (non-voting)2022-12-310001396440main:DTEEnterprisesLLCMember2022-12-310001396440Dynamic Communities, LLC, Secured Debt 12022-12-310001396440Dynamic Communities, LLC, Secured Debt 22022-12-310001396440Dynamic Communities, LLC, Preferred Equity 12022-12-310001396440Dynamic Communities, LLC, Preferred Equity 22022-12-310001396440Dynamic Communities, LLC, Common Equity2022-12-310001396440main:DynamicCommunitiesLLCMember2022-12-310001396440Eastern Wholesale Fence LLC, Secured Debt 12022-12-310001396440Eastern Wholesale Fence LLC, Secured Debt 22022-12-310001396440Eastern Wholesale Fence LLC, Secured Debt 32022-12-310001396440main:EasternWholesaleFenceLLCMember2022-12-310001396440Emerald Technologies Acquisition Co, Inc., Secured Debt2022-12-310001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund VIII, L.P.)2022-12-310001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund VIII Co-Investors, L.P.)2022-12-310001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund IX, L.P.)2022-12-310001396440EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund X, L.P.)2022-12-310001396440EnCap Energy Fund Investments, LP Interests (EnCap Flatrock Midstream Fund II, L.P.)2022-12-310001396440EnCap Energy Fund Investments, LP Interests (EnCap Flatrock Midstream Fund III, L.P.)2022-12-310001396440main:EnCapEnergyFundInvestmentsMember2022-12-310001396440Engineering Research & Consulting, LLC, Secured Debt 12022-12-310001396440Engineering Research & Consulting, LLC, Secured Debt 22022-12-310001396440main:EngineeringResearchConsultingLLCMember2022-12-310001396440EPIC Y-Grade Services, LP, Secured Debt2022-12-310001396440Event Holdco, LLC, Secured Debt 12022-12-310001396440Event Holdco, LLC, Secured Debt 22022-12-310001396440main:EventHoldcoLLCMember2022-12-310001396440Flip Electronics LLC, Secured Debt 12022-12-310001396440Flip Electronics LLC, Secured Debt 22022-12-310001396440main:FlipElectronicsLLCMember2022-12-310001396440Fuse, LLC, Secured Debt2022-12-310001396440Fuse, LLC, Common Stock2022-12-310001396440main:FuseLLCMember2022-12-310001396440GeoStabilization International (GSI), Secured Debt2022-12-310001396440GS HVAM Intermediate, LLC, Secured Debt 12022-12-310001396440GS HVAM Intermediate, LLC, Secured Debt 22022-12-310001396440main:GSHVAMIntermediateLLCMember2022-12-310001396440GULF PACIFIC ACQUISITION, LLC, Secured Debt 12022-12-310001396440GULF PACIFIC ACQUISITION, LLC, Secured Debt 22022-12-310001396440GULF PACIFIC ACQUISITION, LLC, Secured Debt 32022-12-310001396440main:GULFPACIFICACQUISITIONLLCMember2022-12-310001396440HDC/HW Intermediate Holdings, Secured Debt 12022-12-310001396440HDC/HW Intermediate Holdings, Secured Debt 22022-12-310001396440main:HDCHWIntermediateHoldingsMember2022-12-310001396440HEADLANDS OP-CO LLC, Secured Debt 12022-12-310001396440HEADLANDS OP-CO LLC, Secured Debt 22022-12-310001396440HEADLANDS OP-CO LLC, Secured Debt 32022-12-310001396440main:HEADLANDSOPCOLLCMember2022-12-310001396440Heartland Dental, LLC, Secured Debt2022-12-310001396440HOWLCO LLC, Secured Debt2022-12-310001396440Hybrid Promotions, LLC, Secured Debt2022-12-310001396440IG Parent Corporation, Secured Debt 12022-12-310001396440IG Parent Corporation, Secured Debt 22022-12-310001396440main:IGParentCorporationMember2022-12-310001396440Implus Footcare, LLC, Secured Debt2022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Secured Debt 12022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Secured Debt 22022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Secured Debt 32022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Preferred Stock (non-voting) 12022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Preferred Stock (non-voting) 22022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Member Units2022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Warrants2022-12-310001396440main:IndependentPetPartnersIntermediateHoldingsLLCMember2022-12-310001396440Industrial Services Acquisition, LLC, Secured Debt 12022-12-310001396440Industrial Services Acquisition, LLC, Secured Debt 22022-12-310001396440Industrial Services Acquisition, LLC, Preferred Member Units 12022-12-310001396440Industrial Services Acquisition, LLC, Preferred Member Units 22022-12-310001396440Industrial Services Acquisition, LLC, Member Units2022-12-310001396440main:IndustrialServicesAcquisitionLLCMember2022-12-310001396440Infolinks Media Buyco, LLC, Secured Debt 12022-12-310001396440Infolinks Media Buyco, LLC, Secured Debt 22022-12-310001396440main:InfolinksMediaBuycoLLCMember2022-12-310001396440Interface Security Systems, L.L.C, Secured Debt 12022-12-310001396440Interface Security Systems, L.L.C, Secured Debt 22022-12-310001396440Interface Security Systems, L.L.C, Common Stock2022-12-310001396440main:InterfaceSecuritySystemsLLCMember2022-12-310001396440Intermedia Holdings, Inc., Secured Debt2022-12-310001396440Invincible Boat Company, LLC., Secured Debt 12022-12-310001396440Invincible Boat Company, LLC., Secured Debt 22022-12-310001396440main:InvincibleBoatCompanyLLCMember2022-12-310001396440INW Manufacturing, LLC, Secured Debt2022-12-310001396440Isagenix International, LLC, Secured Debt2022-12-310001396440Jackmont Hospitality, Inc., Secured Debt 12022-12-310001396440Jackmont Hospitality, Inc., Secured Debt 22022-12-310001396440Jackmont Hospitality, Inc., Preferred Equity2022-12-310001396440main:JackmontHospitalityIncMember2022-12-310001396440Joerns Healthcare, LLC, Secured Debt 12022-12-310001396440Joerns Healthcare, LLC, Secured Debt 22022-12-310001396440Joerns Healthcare, LLC, Common Stock2022-12-310001396440main:JoernsHealthcareLLCMember2022-12-310001396440JTI Electrical & Mechanical, LLC, Secured Debt 12022-12-310001396440JTI Electrical & Mechanical, LLC, Secured Debt 22022-12-310001396440JTI Electrical & Mechanical, LLC, Common Equity2022-12-310001396440main:JTIElectricalMechanicalLLCMember2022-12-310001396440KMS, LLC, Secured Debt 12022-12-310001396440KMS, LLC, Secured Debt 22022-12-310001396440main:KMSLLCMember2022-12-310001396440Kore Wireless Group Inc., Secured Debt2022-12-310001396440Lightbox Holdings, L.P., Secured Debt2022-12-310001396440LKCM Headwater Investments I, L.P., LP Interests2022-12-310001396440LL Management, Inc., Secured Debt 12022-12-310001396440LL Management, Inc., Secured Debt 22022-12-310001396440LL Management, Inc., Secured Debt 32022-12-310001396440main:LLManagementIncMember2022-12-310001396440LLFlex, LLC, Secured Debt2022-12-310001396440Logix Acquisition Company, LLC, Secured Debt2022-12-310001396440Looking Glass Investments, LLC, Member Units2022-12-310001396440Mako Steel, LP, Secured Debt 12022-12-310001396440Mako Steel, LP, Secured Debt 22022-12-310001396440main:MakoSteelLPMember2022-12-310001396440MB2 Dental Solutions, LLC, Secured Debt 12022-12-310001396440MB2 Dental Solutions, LLC, Secured Debt 22022-12-310001396440main:MB2DentalSolutionsLLCMember2022-12-310001396440Microbe Formulas, LLC, Secured Debt 12022-12-310001396440Microbe Formulas, LLC, Secured Debt 22022-12-310001396440main:MicrobeFormulasLLCMember2022-12-310001396440Mills Fleet Farm Group, LLC, Secured Debt2022-12-310001396440MonitorUS Holding, LLC, Secured Debt 12022-12-310001396440MonitorUS Holding, LLC, Secured Debt 22022-12-310001396440MonitorUS Holding, LLC, Secured Debt 32022-12-310001396440MonitorUS Holding, LLC, Common Stock2022-12-310001396440main:MonitorUSHoldingLLCMember2022-12-310001396440NBG Acquisition Inc, Secured Debt2022-12-310001396440NinjaTrader, LLC, Secured Debt 12022-12-310001396440NinjaTrader, LLC, Secured Debt 22022-12-310001396440NinjaTrader, LLC, Secured Debt 32022-12-310001396440main:NinjaTraderLLCMember2022-12-310001396440NTM Acquisition Corp., Secured Debt2022-12-310001396440NWN Corporation, Secured Debt 12022-12-310001396440NWN Corporation, Secured Debt 22022-12-310001396440NWN Corporation, Secured Debt 32022-12-310001396440main:NWNCorporationMember2022-12-310001396440Ospemifene Royalty Sub LLC, Secured Debt2022-12-310001396440OVG Business Services, LLC, Secured Debt2022-12-310001396440Paragon Healthcare, Inc., Secured Debt 12022-12-310001396440Paragon Healthcare, Inc., Secured Debt 22022-12-310001396440Paragon Healthcare, Inc., Secured Debt 32022-12-310001396440main:ParagonHealthcareIncMember2022-12-310001396440Project Eagle Holdings, LLC, Secured Debt 12022-12-310001396440Project Eagle Holdings, LLC, Secured Debt 22022-12-310001396440main:ProjectEagleHoldingsLLCMember2022-12-310001396440PTL US Bidco, Inc, Secured Debt 12022-12-310001396440PTL US Bidco, Inc, Secured Debt 22022-12-310001396440main:PTLUSBidcoIncMember2022-12-310001396440RA Outdoors LLC, Secured Debt 12022-12-310001396440RA Outdoors LLC, Secured Debt 22022-12-310001396440main:RAOutdoorsLLCMember2022-12-310001396440Research Now Group, Inc. and Survey Sampling International, LLC, Secured Debt2022-12-310001396440RM Bidder, LLC, Member Units2022-12-310001396440RM Bidder, LLC, Warrants2022-12-310001396440main:RMBidderLLCMember2022-12-310001396440Roof Opco, LLC, Secured Debt 12022-12-310001396440Roof Opco, LLC, Secured Debt 22022-12-310001396440Roof Opco, LLC, Secured Debt 32022-12-310001396440main:RoofOpcoLLCMember2022-12-310001396440RTIC Subsidiary Holdings, LLC, Secured Debt 12022-12-310001396440RTIC Subsidiary Holdings, LLC, Secured Debt 22022-12-310001396440main:RTICSubsidiaryHoldingsLLCMember2022-12-310001396440Rug Doctor, LLC., Secured Debt 12022-12-310001396440Rug Doctor, LLC., Secured Debt 22022-12-310001396440main:RugDoctorLLCMember2022-12-310001396440Savers, Inc., Secured Debt2022-12-310001396440SIB Holdings, LLC, Secured Debt 12022-12-310001396440SIB Holdings, LLC, Secured Debt 22022-12-310001396440SIB Holdings, LLC, Secured Debt 32022-12-310001396440SIB Holdings, LLC, Common Equity2022-12-310001396440main:SIBHoldingsLLCMember2022-12-310001396440South Coast Terminals Holdings, LLC, Secured Debt 12022-12-310001396440South Coast Terminals Holdings, LLC, Secured Debt 22022-12-310001396440South Coast Terminals Holdings, LLC, Common Equity2022-12-310001396440main:SouthCoastTerminalsHoldingsLLCMember2022-12-310001396440SPAU Holdings, LLC, Secured Debt 12022-12-310001396440SPAU Holdings, LLC, Secured Debt 22022-12-310001396440SPAU Holdings, LLC, Common Stock2022-12-310001396440main:SPAUHoldingsLLCMember2022-12-310001396440Staples Canada ULC, Secured Debt2022-12-310001396440Stellant Systems, Inc., Secured Debt2022-12-310001396440Tacala Investment Corp., Secured Debt2022-12-310001396440Team Public Choices, LLC, Secured Debt2022-12-310001396440Tectonic Financial, LLC, Common Stock2022-12-310001396440Tex Tech Tennis, LLC, Preferred Equity2022-12-310001396440U.S. TelePacific Corp., Secured Debt2022-12-310001396440USA DeBusk LLC, Secured Debt2022-12-310001396440Veregy Consolidated, Inc., Secured Debt 12022-12-310001396440Veregy Consolidated, Inc., Secured Debt 22022-12-310001396440main:VeregyConsolidatedIncMember2022-12-310001396440Vida Capital, Inc, Secured Debt2022-12-310001396440Vistar Media, Inc., Preferred Stock2022-12-310001396440VORTEQ Coil Finishers, LLC, Common Equity2022-12-310001396440Wahoo Fitness Acquisition L.L.C., Secured Debt2022-12-310001396440Wall Street Prep, Inc., Secured Debt 12022-12-310001396440Wall Street Prep, Inc., Secured Debt 22022-12-310001396440Wall Street Prep, Inc., Common Stock2022-12-310001396440main:WallStreetPrepIncMember2022-12-310001396440Watterson Brands, LLC, Secured Debt 12022-12-310001396440Watterson Brands, LLC, Secured Debt 22022-12-310001396440Watterson Brands, LLC, Secured Debt 32022-12-310001396440main:WattersonBrandsLLCMember2022-12-310001396440West Star Aviation Acquisition, LLC, Secured Debt 12022-12-310001396440West Star Aviation Acquisition, LLC, Secured Debt 22022-12-310001396440West Star Aviation Acquisition, LLC, Common Stock2022-12-310001396440main:WestStarAviationAcquisitionLLCMember2022-12-310001396440Winter Services LLC, Secured Debt 12022-12-310001396440Winter Services LLC, Secured Debt 22022-12-310001396440Winter Services LLC, Secured Debt 32022-12-310001396440main:WinterServicesLLCMember2022-12-310001396440Xenon Arc, Inc., Secured Debt 12022-12-310001396440Xenon Arc, Inc., Secured Debt 22022-12-310001396440Xenon Arc, Inc., Secured Debt 32022-12-310001396440main:XenonArcIncMember2022-12-310001396440YS Garments, LLC, Secured Debt2022-12-310001396440Zips Car Wash, LLC, Secured Debt 12022-12-310001396440Zips Car Wash, LLC, Secured Debt 22022-12-310001396440main:ZipsCarWashLLCMember2022-12-310001396440main:SecuredOvernightFinancingRateSOFROvernightIndexSwapRateOrLondonInterbankOfferedRateLIBORMembersrt:MinimumMember2022-12-310001396440srt:MaximumMembermain:SecuredOvernightFinancingRateSOFROvernightIndexSwapRateOrLondonInterbankOfferedRateLIBORMember2022-12-310001396440srt:WeightedAverageMembermain:SecuredOvernightFinancingRateSOFROvernightIndexSwapRateOrLondonInterbankOfferedRateLIBORMember2022-12-310001396440main:StaplesCanadaULCMemberus-gaap:ForeignExchangeForwardMember2022-12-31iso4217:CAD0001396440main:StaplesCanadaULCMemberus-gaap:ForeignExchangeForwardMember2023-01-012023-03-310001396440main:ArrowInternationalIncMembermain:SecuredOvernightFinancingRateSOFRMember2022-12-310001396440main:ArrowInternationalIncMember2022-12-310001396440RM Bidder, LLC, Warrants2023-01-012023-03-310001396440main:SecuredOvernightFinancingRateSOFRMembermain:ChannelPartnersIntermediatecoLLCMember2022-12-310001396440srt:MinimumMember2022-12-310001396440srt:MaximumMember2022-12-310001396440main:VariousInvestment1Membermain:SecuredOvernightFinancingRateSOFRMember2022-12-310001396440main:VariousInvestment1Member2022-12-310001396440main:CadenceAerospaceLLCMember2022-12-310001396440main:CadenceAerospaceLLCMembermain:LondonInterbankOfferedRateLIBOR1Member2022-12-310001396440main:IndependentPetPartnersIntermediateHoldingsLLCMembermain:LondonInterbankOfferedRateLIBOR1Member2022-12-310001396440us-gaap:PrimeRateMembermain:IndependentPetPartnersIntermediateHoldingsLLCMember2022-12-310001396440Independent Pet Partners Intermediate Holdings, LLC, Warrants2023-01-012023-03-310001396440main:SecuredOvernightFinancingRateSOFRMembermain:BolderPantherGroupLLCMember2022-12-310001396440main:SecuredOvernightFinancingRateSOFRMembermain:IGParentCorporationMember2022-12-310001396440main:SecuredOvernightFinancingRateSOFRMembermain:ChannelPartnersIntermediatecoLLC1Member2022-12-310001396440main:ChannelPartnersIntermediatecoLLC1Member2022-12-310001396440main:ComputerDataSourceLLCMembermain:LondonInterbankOfferedRateLIBOR1Member2022-12-310001396440main:InterfaceSecuritySystemsLLCMembermain:LondonInterbankOfferedRateLIBOR1Member2022-12-310001396440main:MakoSteelLPMembermain:LondonInterbankOfferedRateLIBOR1Member2022-12-310001396440main:SecuredOvernightFinancingRateSOFRMembermain:NWNCorporationMember2022-12-310001396440main:SecuredOvernightFinancingRateSOFRMembermain:ParagonHealthcareIncMember2022-12-310001396440main:SecuredOvernightFinancingRateSOFRMembermain:RTICSubsidiaryHoldingsLLCMember2022-12-310001396440main:LowerMiddleMarketPortfolioMember2023-01-012023-09-300001396440main:LowerMiddleMarketPortfolioMember2023-07-012023-09-30main:company0001396440main:LowerMiddleMarketPortfolioMember2022-07-012022-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:LowerMiddleMarketPortfolioMember2023-07-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:LowerMiddleMarketPortfolioMember2022-07-012022-09-300001396440main:LowerMiddleMarketPortfolioMember2022-10-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:LowerMiddleMarketPortfolioMember2022-10-012023-09-300001396440main:PrivateLoanPortfolioMember2023-01-012023-09-300001396440main:PrivateLoanPortfolioMember2023-07-012023-09-300001396440main:PrivateLoanPortfolioMember2022-07-012022-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:PrivateLoanPortfolioMember2023-07-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:PrivateLoanPortfolioMember2022-07-012022-09-300001396440main:PrivateLoanPortfolioMember2022-10-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:PrivateLoanPortfolioMember2022-10-012023-09-300001396440main:MiddleMarketPortfolioMember2023-09-300001396440main:MiddleMarketPortfolioMember2022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMemberus-gaap:OtherAggregatedInvestmentsMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMemberus-gaap:OtherAggregatedInvestmentsMember2022-01-012022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMemberus-gaap:NonperformingFinancingReceivableMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:NonperformingFinancingReceivableMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMemberus-gaap:NonperformingFinancingReceivableMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:NonperformingFinancingReceivableMember2022-01-012022-12-310001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2023-01-012023-09-300001396440us-gaap:ShortTermInvestmentsMember2022-12-31main:investment0001396440us-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-09-300001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMember2023-09-300001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMembersrt:MaximumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-09-300001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMembersrt:WeightedAverageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-09-300001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MedianMember2023-09-300001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MinimumMember2023-09-300001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:MeasurementInputEbitdaMultipleMember2023-09-300001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:MeasurementInputEbitdaMultipleMember2023-09-300001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MedianMember2023-09-300001396440us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMembermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MedianMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMembermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MedianMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputThirdPartyQuoteMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2023-09-300001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputThirdPartyQuoteMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMembermain:MeasurementInputThirdPartyQuoteMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputThirdPartyQuoteMembersrt:MedianMemberus-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:FairValueInputsLevel3Member2023-09-300001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputEBITDAMultipleOutlierMembersrt:MinimumMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputEBITDAMultipleOutlierMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorOutlierMembersrt:MinimumMember2023-09-300001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorOutlierMembersrt:MaximumMember2023-09-300001396440us-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMember2022-12-310001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMembersrt:MaximumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMembersrt:WeightedAverageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001396440us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MedianMember2022-12-310001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MinimumMember2022-12-310001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMemberus-gaap:MeasurementInputEbitdaMultipleMember2022-12-310001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberus-gaap:MeasurementInputEbitdaMultipleMember2022-12-310001396440main:ValuationMarketAndEnterpriseValueApproachMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MedianMember2022-12-310001396440us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMembermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MedianMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMembermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputExpectedPrincipalRecoveryPercentageMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MedianMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputThirdPartyQuoteMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2022-12-310001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputThirdPartyQuoteMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMembermain:MeasurementInputThirdPartyQuoteMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membermain:MeasurementInputThirdPartyQuoteMembersrt:MedianMemberus-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:FairValueInputsLevel3Member2022-12-310001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputEBITDAMultipleOutlierMembersrt:MinimumMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membersrt:MaximumMembermain:MeasurementInputEBITDAMultipleOutlierMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorOutlierMembersrt:MinimumMember2022-12-310001396440us-gaap:FairValueInputsLevel3Membermain:MeasurementInputRiskAdjustedDiscountFactorOutlierMembersrt:MaximumMember2022-12-310001396440us-gaap:DebtSecuritiesMember2022-12-310001396440us-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440main:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440us-gaap:DebtSecuritiesMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-01-012023-09-300001396440us-gaap:DebtSecuritiesMember2023-09-300001396440us-gaap:EquitySecuritiesMember2022-12-310001396440us-gaap:EquitySecuritiesMember2023-01-012023-09-300001396440main:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:EquitySecuritiesMember2023-01-012023-09-300001396440us-gaap:EquitySecuritiesMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-01-012023-09-300001396440us-gaap:EquitySecuritiesMember2023-09-300001396440main:EquityWarrantMember2022-12-310001396440main:EquityWarrantMember2023-01-012023-09-300001396440main:EquityWarrantMembermain:DebtAndEquitySecuritiesRealizedGainLossMember2023-01-012023-09-300001396440main:EquityWarrantMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-01-012023-09-300001396440main:EquityWarrantMember2023-09-300001396440us-gaap:InvestmentsMember2022-12-310001396440us-gaap:InvestmentsMember2023-01-012023-09-300001396440main:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:InvestmentsMember2023-01-012023-09-300001396440us-gaap:InvestmentsMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-01-012023-09-300001396440us-gaap:InvestmentsMember2023-09-300001396440us-gaap:DebtSecuritiesMember2021-12-310001396440us-gaap:DebtSecuritiesMember2022-01-012022-09-300001396440main:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:DebtSecuritiesMember2022-01-012022-09-300001396440us-gaap:DebtSecuritiesMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-01-012022-09-300001396440us-gaap:DebtSecuritiesMember2022-09-300001396440us-gaap:EquitySecuritiesMember2021-12-310001396440us-gaap:EquitySecuritiesMember2022-01-012022-09-300001396440main:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:EquitySecuritiesMember2022-01-012022-09-300001396440us-gaap:EquitySecuritiesMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-01-012022-09-300001396440us-gaap:EquitySecuritiesMember2022-09-300001396440main:EquityWarrantMember2021-12-310001396440main:EquityWarrantMember2022-01-012022-09-300001396440main:EquityWarrantMembermain:DebtAndEquitySecuritiesRealizedGainLossMember2022-01-012022-09-300001396440main:EquityWarrantMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-01-012022-09-300001396440main:EquityWarrantMember2022-09-300001396440us-gaap:InvestmentsMember2021-12-310001396440us-gaap:InvestmentsMember2022-01-012022-09-300001396440main:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:InvestmentsMember2022-01-012022-09-300001396440us-gaap:InvestmentsMembermain:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-01-012022-09-300001396440us-gaap:InvestmentsMember2022-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:LowerMiddleMarketPortfolioMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Membermain:LowerMiddleMarketPortfolioMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Membermain:LowerMiddleMarketPortfolioMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membermain:LowerMiddleMarketPortfolioMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:PrivateLoanPortfolioMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:PrivateLoanPortfolioMemberus-gaap:FairValueInputsLevel1Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:PrivateLoanPortfolioMemberus-gaap:FairValueInputsLevel2Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membermain:PrivateLoanPortfolioMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMemberus-gaap:FairValueInputsLevel1Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMemberus-gaap:FairValueInputsLevel2Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMemberus-gaap:FairValueInputsLevel3Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherAggregatedInvestmentsMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherAggregatedInvestmentsMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherAggregatedInvestmentsMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMemberus-gaap:FairValueInputsLevel1Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMemberus-gaap:FairValueInputsLevel2Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMemberus-gaap:FairValueInputsLevel3Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMember2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-09-300001396440us-gaap:FairValueMeasurementsRecurringMembermain:LowerMiddleMarketPortfolioMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Membermain:LowerMiddleMarketPortfolioMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Membermain:LowerMiddleMarketPortfolioMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membermain:LowerMiddleMarketPortfolioMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:PrivateLoanPortfolioMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:PrivateLoanPortfolioMemberus-gaap:FairValueInputsLevel1Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:PrivateLoanPortfolioMemberus-gaap:FairValueInputsLevel2Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membermain:PrivateLoanPortfolioMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMemberus-gaap:FairValueInputsLevel1Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMemberus-gaap:FairValueInputsLevel2Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:MiddleMarketPortfolioMemberus-gaap:FairValueInputsLevel3Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherAggregatedInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherAggregatedInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherAggregatedInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMemberus-gaap:FairValueInputsLevel1Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMemberus-gaap:FairValueInputsLevel2Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMembermain:ExternalInvestmentManagerInvestmentsMemberus-gaap:FairValueInputsLevel3Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ShortTermInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ShortTermInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ShortTermInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ShortTermInvestmentsMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMember2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310001396440us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-310001396440main:LowerMiddleMarketPortfolioMembersrt:MinimumMember2023-01-012023-09-300001396440srt:MaximumMembermain:LowerMiddleMarketPortfolioMember2023-01-012023-09-300001396440main:LowerMiddleMarketPortfolioMembersrt:MinimumMember2023-09-300001396440srt:MaximumMembermain:LowerMiddleMarketPortfolioMember2023-09-300001396440main:LowerMiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2023-01-012023-09-300001396440srt:MaximumMembermain:LowerMiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440main:PrivateLoanPortfolioMembersrt:MinimumMember2023-09-300001396440srt:MaximumMembermain:PrivateLoanPortfolioMember2023-09-300001396440main:PrivateLoanPortfolioMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2023-01-012023-09-300001396440srt:MaximumMembermain:PrivateLoanPortfolioMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440main:MiddleMarketPortfolioMembersrt:MinimumMember2023-01-012023-09-300001396440srt:MaximumMembermain:MiddleMarketPortfolioMember2023-01-012023-09-300001396440main:MiddleMarketPortfolioMembersrt:MinimumMember2023-09-300001396440srt:MaximumMembermain:MiddleMarketPortfolioMember2023-09-300001396440main:MiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2023-01-012023-09-300001396440srt:MaximumMembermain:MiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440us-gaap:OtherAggregatedInvestmentsMemberus-gaap:DebtSecuritiesMembersrt:MinimumMember2023-01-012023-09-300001396440srt:MaximumMemberus-gaap:OtherAggregatedInvestmentsMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440srt:MaximumMemberus-gaap:ShortTermInvestmentsMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440srt:AffiliatedEntityMembermain:ExternalInvestmentManagerMember2023-07-012023-09-300001396440srt:AffiliatedEntityMembermain:ExternalInvestmentManagerMember2022-07-012022-09-300001396440srt:AffiliatedEntityMembermain:ExternalInvestmentManagerMember2023-01-012023-09-300001396440srt:AffiliatedEntityMembermain:ExternalInvestmentManagerMember2022-01-012022-09-300001396440main:LowerMiddleMarketPortfolioMember2023-09-300001396440main:PrivateLoanPortfolioMember2023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:LowerMiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:PrivateLoanPortfolioMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:MiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:LowerMiddleMarketPortfolioMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:PrivateLoanPortfolioMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:MiddleMarketPortfolioMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesFirstLienMembermain:LowerMiddleMarketPortfolioMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesFirstLienMembermain:PrivateLoanPortfolioMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:MiddleMarketPortfolioMembermain:DebtSecuritiesFirstLienMember2023-01-012023-09-300001396440main:LowerMiddleMarketPortfolioMemberus-gaap:NonperformingFinancingReceivableMember2023-09-300001396440main:PrivateLoanPortfolioMemberus-gaap:NonperformingFinancingReceivableMember2023-09-300001396440main:MiddleMarketPortfolioMemberus-gaap:NonperformingFinancingReceivableMember2023-09-300001396440main:LowerMiddleMarketPortfolioMember2022-12-310001396440main:PrivateLoanPortfolioMember2022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:LowerMiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:PrivateLoanPortfolioMemberus-gaap:DebtSecuritiesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:MiddleMarketPortfolioMemberus-gaap:DebtSecuritiesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:LowerMiddleMarketPortfolioMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:PrivateLoanPortfolioMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:MiddleMarketPortfolioMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesFirstLienMembermain:LowerMiddleMarketPortfolioMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesFirstLienMembermain:PrivateLoanPortfolioMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:MiddleMarketPortfolioMembermain:DebtSecuritiesFirstLienMember2022-01-012022-12-310001396440main:LowerMiddleMarketPortfolioMemberus-gaap:NonperformingFinancingReceivableMember2022-12-310001396440main:PrivateLoanPortfolioMemberus-gaap:NonperformingFinancingReceivableMember2022-12-310001396440main:MiddleMarketPortfolioMemberus-gaap:NonperformingFinancingReceivableMember2022-12-310001396440main:LowerMiddleMarketPortfolioMember2022-01-012022-12-310001396440main:PrivateLoanPortfolioMember2022-01-012022-12-3100013964402022-01-012022-12-310001396440us-gaap:OtherAggregatedInvestmentsMember2023-09-30main:entity0001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:OtherAggregatedInvestmentsMember2023-01-012023-09-300001396440us-gaap:OtherAggregatedInvestmentsMember2022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:OtherAggregatedInvestmentsMember2022-01-012022-12-310001396440main:ExternalInvestmentManagerInvestmentsMember2023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ExternalInvestmentManagerInvestmentsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:ExternalInvestmentManagerInvestmentsMember2023-01-012023-09-300001396440main:ExternalInvestmentManagerInvestmentsMember2022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ExternalInvestmentManagerInvestmentsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:ExternalInvestmentManagerInvestmentsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesFirstLienMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesFirstLienMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesSecondLienMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:DebtSecuritiesSecondLienMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:EquityWarrantMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMembermain:EquityWarrantMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:OtherAggregatedInvestmentsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMemberus-gaap:OtherAggregatedInvestmentsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:DebtSecuritiesFirstLienMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:DebtSecuritiesFirstLienMember2022-01-012022-12-310001396440main:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMemberus-gaap:EquitySecuritiesMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:DebtSecuritiesSecondLienMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:DebtSecuritiesSecondLienMember2022-01-012022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:EquityWarrantMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:EquityWarrantMember2022-01-012022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMemberus-gaap:OtherAggregatedInvestmentsMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMemberus-gaap:OtherAggregatedInvestmentsMember2022-01-012022-12-310001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:InvestmentTypeConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440us-gaap:WestRegionMembermain:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440us-gaap:WestRegionMembermain:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NortheastRegionMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NortheastRegionMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMemberus-gaap:SouthwestRegionMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMemberus-gaap:SouthwestRegionMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440us-gaap:MidwestRegionMembermain:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440us-gaap:MidwestRegionMembermain:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMemberus-gaap:SoutheastRegionMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMemberus-gaap:SoutheastRegionMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NonUsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NonUsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembercountry:CAus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembercountry:CAus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440us-gaap:WestRegionMembermain:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440us-gaap:WestRegionMembermain:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NortheastRegionMember2023-01-012023-09-300001396440main:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NortheastRegionMember2022-01-012022-12-310001396440main:InvestmentOwnedAtFairValueMemberus-gaap:SouthwestRegionMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtFairValueMemberus-gaap:SouthwestRegionMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440us-gaap:MidwestRegionMembermain:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440us-gaap:MidwestRegionMembermain:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440us-gaap:SoutheastRegionMembermain:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440us-gaap:SoutheastRegionMembermain:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NonUsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:NonUsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtFairValueMembercountry:CAus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtFairValueMembercountry:CAus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtFairValueMemberus-gaap:GeographicConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:InternetSoftwareAndServicesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:InternetSoftwareAndServicesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:MachineryMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:MachineryMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:CommercialServicesAndSuppliesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:CommercialServicesAndSuppliesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ProfessionalServicesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ProfessionalServicesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ConstructionAndEngineeringMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ConstructionAndEngineeringMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HealthCareProvidersAndServicesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HealthCareProvidersAndServicesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ITServicesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ITServicesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:DiversifiedConsumerServicesMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:DiversifiedConsumerServicesMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:DistributorsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:DistributorsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:TextilesApparelAndLuxuryGoodsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:TextilesApparelAndLuxuryGoodsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:LeisureEquipmentAndProductsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:LeisureEquipmentAndProductsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:EnergyEquipmentAndServicesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:EnergyEquipmentAndServicesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:TobaccoMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:TobaccoMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:ComputersAndPeripheralsMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:ComputersAndPeripheralsMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:MediaMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:MediaMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:SpecialtyRetailMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:SpecialtyRetailMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:SoftwareMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:SoftwareMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:ElectricalEquipmentMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:ElectricalEquipmentMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:BuildingProductsMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:BuildingProductsMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:AerospaceAndDefenseMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:AerospaceAndDefenseMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ContainersAndPackagingMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ContainersAndPackagingMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:DiversifiedTelecommunicationServicesMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:DiversifiedTelecommunicationServicesMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:AutoComponentsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:AutoComponentsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:FoodProductsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:FoodProductsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ElectronicEquipmentInstrumentsAndComponentsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ElectronicEquipmentInstrumentsAndComponentsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:CommunicationsEquipmentMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:CommunicationsEquipmentMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:DiversifiedFinancialServicesMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:DiversifiedFinancialServicesMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:InternetAndCatalogRetailMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:InternetAndCatalogRetailMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HealthCareEquipmentAndSuppliesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HealthCareEquipmentAndSuppliesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:FoodAndStaplesRetailingMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:FoodAndStaplesRetailingMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HotelsRestaurantsAndLeisureMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HotelsRestaurantsAndLeisureMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ChemicalsMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:ChemicalsMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HouseholdDurablesMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:HouseholdDurablesMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:OtherMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMembermain:OtherMember2022-01-012022-12-310001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMember2023-01-012023-09-300001396440main:InvestmentOwnedAtCostMembermain:IndustryConcentrationRiskMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:MachineryMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:MachineryMember2022-01-012022-12-310001396440main:DiversifiedConsumerServicesMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:DiversifiedConsumerServicesMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:InternetSoftwareAndServicesMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:InternetSoftwareAndServicesMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ProfessionalServicesMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ProfessionalServicesMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ConstructionAndEngineeringMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ConstructionAndEngineeringMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:CommercialServicesAndSuppliesMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:CommercialServicesAndSuppliesMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:HealthCareProvidersAndServicesMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:HealthCareProvidersAndServicesMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:DistributorsMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:DistributorsMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ITServicesMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ITServicesMember2022-01-012022-12-310001396440main:ComputersAndPeripheralsMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:ComputersAndPeripheralsMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:TobaccoMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:TobaccoMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:EnergyEquipmentAndServicesMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:EnergyEquipmentAndServicesMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:SpecialtyRetailMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:SpecialtyRetailMember2022-01-012022-12-310001396440main:MediaMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:MediaMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:LeisureEquipmentAndProductsMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:LeisureEquipmentAndProductsMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:TextilesApparelAndLuxuryGoodsMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:TextilesApparelAndLuxuryGoodsMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:SoftwareMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:SoftwareMember2022-01-012022-12-310001396440main:ElectricalEquipmentMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:ElectricalEquipmentMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ContainersAndPackagingMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ContainersAndPackagingMember2022-01-012022-12-310001396440main:AerospaceAndDefenseMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:AerospaceAndDefenseMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:FoodProductsMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:FoodProductsMember2022-01-012022-12-310001396440main:BuildingProductsMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:BuildingProductsMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:AutoComponentsMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:AutoComponentsMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:DiversifiedTelecommunicationServicesMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:DiversifiedTelecommunicationServicesMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:DiversifiedFinancialServicesMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:DiversifiedFinancialServicesMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:InternetAndCatalogRetailMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:InternetAndCatalogRetailMember2022-01-012022-12-310001396440main:AirFreightLogisticsMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:AirFreightLogisticsMembermain:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ConstructionMaterialsMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ConstructionMaterialsMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:HealthCareEquipmentAndSuppliesMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:HealthCareEquipmentAndSuppliesMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ChemicalsMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:ChemicalsMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:FoodAndStaplesRetailingMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:FoodAndStaplesRetailingMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:OtherMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMembermain:OtherMember2022-01-012022-12-310001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2023-01-012023-09-300001396440main:IndustryConcentrationRiskMembermain:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001396440srt:AffiliatedEntityMembermain:AdvisoryAgreementMembermain:ExternalInvestmentManagerMember2023-01-012023-09-300001396440main:ExternalInvestmentManagerMember2023-07-012023-09-300001396440main:ExternalInvestmentManagerMember2022-07-012022-09-300001396440main:ExternalInvestmentManagerMember2023-01-012023-09-300001396440main:ExternalInvestmentManagerMember2022-01-012022-09-300001396440main:ExternalInvestmentManagerMember2023-09-300001396440main:ExternalInvestmentManagerMember2022-12-310001396440main:ExternalInvestmentManagerMemberus-gaap:ManagementServiceBaseMember2023-07-012023-09-300001396440main:ExternalInvestmentManagerMemberus-gaap:ManagementServiceBaseMember2022-07-012022-09-300001396440main:ExternalInvestmentManagerMemberus-gaap:ManagementServiceBaseMember2023-01-012023-09-300001396440main:ExternalInvestmentManagerMemberus-gaap:ManagementServiceBaseMember2022-01-012022-09-300001396440us-gaap:ManagementServiceIncentiveMembermain:ExternalInvestmentManagerMember2023-07-012023-09-300001396440us-gaap:ManagementServiceIncentiveMembermain:ExternalInvestmentManagerMember2022-07-012022-09-300001396440us-gaap:ManagementServiceIncentiveMembermain:ExternalInvestmentManagerMember2023-01-012023-09-300001396440us-gaap:ManagementServiceIncentiveMembermain:ExternalInvestmentManagerMember2022-01-012022-09-300001396440main:ExternalInvestmentManagerMemberus-gaap:AdministrativeServiceMember2023-07-012023-09-300001396440main:ExternalInvestmentManagerMemberus-gaap:AdministrativeServiceMember2022-07-012022-09-300001396440main:ExternalInvestmentManagerMemberus-gaap:AdministrativeServiceMember2023-01-012023-09-300001396440main:ExternalInvestmentManagerMemberus-gaap:AdministrativeServiceMember2022-01-012022-09-300001396440main:CorporateFacilityMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2023-09-300001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2023-09-300001396440main:CorporateFacilityMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2022-12-310001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-12-310001396440main:CorporateFacilityMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2023-07-012023-09-300001396440main:CorporateFacilityMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2022-07-012022-09-300001396440main:CorporateFacilityMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2023-01-012023-09-300001396440main:CorporateFacilityMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2022-01-012022-09-300001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2023-07-012023-09-300001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-07-012022-09-300001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2023-01-012023-09-300001396440us-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-01-012022-09-300001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2023-07-012023-09-300001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2022-07-012022-09-300001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2023-01-012023-09-300001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2022-01-012022-09-300001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2023-07-012023-09-300001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2022-07-012022-09-300001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2023-01-012023-09-300001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2022-01-012022-09-300001396440us-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2023-07-012023-09-300001396440us-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2022-07-012022-09-300001396440us-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2023-01-012023-09-300001396440us-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2022-01-012022-09-300001396440main:December2025NotesMemberus-gaap:UnsecuredDebtMember2023-07-012023-09-300001396440main:December2025NotesMemberus-gaap:UnsecuredDebtMember2022-07-012022-09-300001396440main:December2025NotesMemberus-gaap:UnsecuredDebtMember2023-01-012023-09-300001396440main:December2025NotesMemberus-gaap:UnsecuredDebtMember2022-01-012022-09-300001396440us-gaap:UnsecuredDebtMembermain:December2022NotesMember2023-07-012023-09-300001396440us-gaap:UnsecuredDebtMembermain:December2022NotesMember2022-07-012022-09-300001396440us-gaap:UnsecuredDebtMembermain:December2022NotesMember2023-01-012023-09-300001396440us-gaap:UnsecuredDebtMembermain:December2022NotesMember2022-01-012022-09-30main:lender0001396440main:CorporateFacilityMembermain:SecuredOvernightFinancingRateSOFRMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembersrt:MinimumMember2023-01-012023-09-300001396440us-gaap:PrimeRateMembermain:CorporateFacilityMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembersrt:MinimumMember2023-01-012023-09-300001396440main:CorporateFacilityMembermain:SecuredOvernightFinancingRateSOFRMemberus-gaap:LineOfCreditMembersrt:MaximumMemberus-gaap:RevolvingCreditFacilityMember2023-01-012023-09-300001396440us-gaap:PrimeRateMembermain:CorporateFacilityMemberus-gaap:LineOfCreditMembersrt:MaximumMemberus-gaap:RevolvingCreditFacilityMember2023-01-012023-09-300001396440main:MSCCFundingILLCMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-11-300001396440main:MSCCFundingILLCMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-12-310001396440main:MSCCFundingILLCMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2023-09-300001396440main:MSCCFundingILLCMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2023-01-012023-09-300001396440main:MSCCFundingILLCMembermain:SecuredOvernightFinancingRateSOFRMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-11-012022-12-310001396440main:MSCCFundingILLCMembermain:SecuredOvernightFinancingRateSOFRMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:MarginEffectivePeriodOneMembermain:SPVFacilityMember2022-11-012022-12-310001396440main:MSCCFundingILLCMembermain:SecuredOvernightFinancingRateSOFRMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMembermain:MarginEffectivePeriodTwoMember2022-11-012022-12-310001396440main:MSCCFundingILLCMembermain:SecuredOvernightFinancingRateSOFRMemberus-gaap:LineOfCreditMembermain:MarginEffectivePeriodThreeMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-11-012022-12-310001396440main:MSCCFundingILLCMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMembersrt:MinimumMember2022-11-012022-12-310001396440main:MSCCFundingILLCMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-11-012022-12-310001396440main:MSCCFundingILLCMemberus-gaap:LineOfCreditMembersrt:MaximumMemberus-gaap:RevolvingCreditFacilityMembermain:SPVFacilityMember2022-11-012022-12-310001396440main:MSCCFundingILLCMember2023-07-012023-09-300001396440main:MSCCFundingILLCMember2023-01-012023-09-300001396440main:MSCCFundingILLCMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-09-300001396440main:MSCCFundingILLCMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001396440main:MSCCFundingILLCMember2023-09-300001396440main:MSCCFundingILLCMember2022-12-310001396440main:MSCCFundingILLCMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-07-012023-09-300001396440main:MSCCFundingILLCMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-01-012023-09-300001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2021-01-310001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2021-01-012021-01-310001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2021-10-310001396440main:July2026NotesMemberus-gaap:UnsecuredDebtMember2021-10-012021-10-310001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2019-04-300001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2019-04-012019-04-300001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2019-12-310001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2019-12-012019-12-310001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2020-07-310001396440us-gaap:UnsecuredDebtMembermain:May2024NotesMember2020-07-012020-07-310001396440srt:MaximumMemberus-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2023-09-300001396440us-gaap:UnsecuredDebtMember2022-12-310001396440main:MainStreetMezzanineFundLPMemberus-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2023-09-300001396440main:MainStreetCapitalIIILPMemberus-gaap:UnsecuredDebtMembermain:SBICDebenturesMember2023-09-300001396440main:December2025SeriesANotesMemberus-gaap:UnsecuredDebtMember2022-12-310001396440main:December2025SeriesBNotesMemberus-gaap:UnsecuredDebtMember2023-02-280001396440main:December2025NotesMemberus-gaap:UnsecuredDebtMembersrt:MinimumMember2022-12-31main:agency0001396440main:December2025NotesMembersrt:MaximumMemberus-gaap:UnsecuredDebtMember2022-12-310001396440us-gaap:UnsecuredDebtMembermain:December2022NotesMember2017-11-300001396440us-gaap:UnsecuredDebtMembermain:December2022NotesMember2017-11-012017-11-300001396440us-gaap:RelatedPartyMembermain:ExternalInvestmentManagerMember2023-01-012023-09-300001396440us-gaap:RelatedPartyMembermain:ExternalInvestmentManagerMember2022-01-012022-09-300001396440main:AtTheMarketOfferingsMember2023-01-012023-09-300001396440main:AtTheMarketOfferingsMembersrt:WeightedAverageMember2023-09-300001396440main:AtTheMarketOfferingsMember2022-03-012022-03-310001396440main:AtTheMarketOfferingsMember2023-09-300001396440main:AtTheMarketOfferingsMember2022-01-012022-12-310001396440main:AtTheMarketOfferingsMembersrt:WeightedAverageMember2022-12-310001396440main:PublicEquityOfferingMember2022-01-012022-12-310001396440main:PublicEquityOfferingMember2022-12-310001396440us-gaap:OverAllotmentOptionMember2022-01-012022-12-310001396440us-gaap:RestrictedStockMembermain:MainStreetCapitalCorporation2022EquityAndIncentivePlanMember2023-01-012023-09-300001396440us-gaap:RestrictedStockMembermain:MainStreetCapitalCorporation2022EquityAndIncentivePlanMember2023-09-300001396440us-gaap:RestrictedStockMembermain:MainStreetCapitalCorporation2022NonEmployeeDirectorRestrictedStockPlanMembersrt:DirectorMember2023-09-300001396440us-gaap:RestrictedStockMembermain:MainStreetCapitalCorporation2022NonEmployeeDirectorRestrictedStockPlanMembersrt:DirectorMember2023-01-012023-09-300001396440us-gaap:RestrictedStockMember2023-07-012023-09-300001396440us-gaap:RestrictedStockMember2022-07-012022-09-300001396440us-gaap:RestrictedStockMember2023-01-012023-09-300001396440us-gaap:RestrictedStockMember2022-01-012022-09-300001396440us-gaap:RestrictedStockMember2022-12-310001396440us-gaap:RestrictedStockMember2023-09-300001396440Brightwood Capital Fund V, LP2023-09-300001396440Brightwood Capital Fund III, LP2023-09-300001396440main:BrightwoodCapitalFundInvestmentsMemberus-gaap:EquitySecuritiesMember2023-09-300001396440Freeport First Lien Loan Fund III LP2023-09-300001396440Freeport Financial SBIC Fund LP2023-09-300001396440main:FreeportFundInvestmentsMemberus-gaap:EquitySecuritiesMember2023-09-300001396440HPEP 4, L.P.2023-09-300001396440HPEP 3, L.P.2023-09-300001396440HPEP 423 COR, LP2023-09-3000013964402717 MH, L.P.2023-09-300001396440us-gaap:EquitySecuritiesMembermain:HarrisPrestonFundInvestmentsMember2023-09-300001396440MS Private Loan Fund I, LP 12023-09-300001396440MS Private Loan Fund II, LP, Equity Securities2023-09-300001396440UnionRock Energy Fund III, LP2023-09-300001396440UnionRock Energy Fund II, LP2023-09-300001396440main:UnionRockEnergyFundInvestmentsMember2023-09-300001396440us-gaap:EquitySecuritiesMember2023-09-300001396440MS Private Loan Fund II, LP , Debt Securities2023-09-300001396440Dalton US Inc.2023-09-300001396440HEADLANDS OP-CO LLC2023-09-300001396440MS Private Loan Fund I, LP2023-09-300001396440Power System Solutions2023-09-300001396440Xenon Arc, Inc.2023-09-300001396440AMEREQUIP LLC.2023-09-300001396440AB Centers Acquisition Corporation2023-09-300001396440NWN Corporation2023-09-300001396440Channel Partners Intermediateco, LLC2023-09-300001396440Archer Systems, LLC2023-09-300001396440JTI Electrical & Mechanical, LLC2023-09-300001396440Insight Borrower Corporation2023-09-300001396440Veregy Consolidated, Inc.2023-09-300001396440SI East, LLC2023-09-300001396440PTL US Bidco, Inc2023-09-300001396440Richardson Sales Solutions2023-09-300001396440South Coast Terminals Holdings, LLC2023-09-300001396440Paragon Healthcare, Inc.2023-09-300001396440Cody Pools, Inc.2023-09-300001396440Bettercloud, Inc.2023-09-300001396440IG Investor, LLC2023-09-300001396440NexRev LLC2023-09-300001396440Microbe Formulas, LLC2023-09-300001396440Eastern Wholesale Fence LLC2023-09-300001396440Classic H&G Holdco, LLC2023-09-300001396440VVS Holdco, LLC2023-09-300001396440Watterson Brands, LLC2023-09-300001396440Mako Steel, LP2023-09-300001396440Metalforming Holdings, LLC2023-09-300001396440Career Team Holdings, LLC2023-09-300001396440Engineering Research & Consulting, LLC2023-09-300001396440IG Parent Corporation2023-09-300001396440Nebraska Vet AcquireCo, LLC2023-09-300001396440Superior Rigging & Erecting Co.2023-09-300001396440CaseWorthy, Inc.2023-09-300001396440Centre Technologies Holdings, LLC2023-09-300001396440Winter Services LLC2023-09-300001396440GULF PACIFIC ACQUISITION, LLC2023-09-300001396440AVEX Aviation Holdings, LLC2023-09-300001396440Hawk Ridge Systems, LLC2023-09-300001396440ITA Holdings Group, LLC2023-09-300001396440Batjer TopCo, LLC 2023-09-300001396440Cybermedia Technologies, LLC2023-09-300001396440Elgin AcquireCo, LLC2023-09-300001396440Burning Glass Intermediate Holding Company, Inc.2023-09-300001396440Johnson Downie Opco, LLC2023-09-300001396440NinjaTrader, LLC2023-09-300001396440GRT Rubber Technologies LLC2023-09-300001396440RTIC Subsidiary Holdings, LLC2023-09-300001396440Trantech Radiator Topco, LLC2023-09-300001396440Chamberlin Holding LLC2023-09-300001396440Acumera, Inc.2023-09-300001396440Pearl Meyer Topco LLC2023-09-300001396440Bond Brand Loyalty ULC2023-09-300001396440American Health Staffing Group, Inc.2023-09-300001396440Escalent, Inc.2023-09-300001396440Evergreen North America Acquisitions, LLC2023-09-300001396440Project Eagle Holdings, LLC2023-09-300001396440West Star Aviation Acquisition, LLC2023-09-300001396440Gamber-Johnson Holdings, LLC2023-09-300001396440ATS Operating, LLC2023-09-300001396440Bluestem Brands, Inc.2023-09-300001396440Infolinks Media Buyco, LLC2023-09-300001396440Imaging Business Machines, L.L.C.2023-09-300001396440Orttech Holdings, LLC2023-09-300001396440Mystic Logistics Holdings, LLC2023-09-300001396440Roof Opco, LLC2023-09-300001396440Adams Publishing Group, LLC2023-09-300001396440RA Outdoors LLC2023-09-300001396440Invincible Boat Company, LLC.2023-09-300001396440Project BarFly, LLC2023-09-300001396440SPAU Holdings, LLC2023-09-300001396440Analytical Systems Keco Holdings, LLC2023-09-300001396440Jensen Jewelers of Idaho, LLC2023-09-300001396440Clad-Rex Steel, LLC2023-09-300001396440Wall Street Prep, Inc.2023-09-300001396440Gulf Publishing Holdings, LLC2023-09-300001396440GS HVAM Intermediate, LLC2023-09-300001396440Inspire Aesthetics Management, LLC