0001512931false2023FYhttp://fasb.org/us-gaap/2023#DebtAndEquitySecuritiesRealizedGainLosshttp://fasb.org/us-gaap/2023#DebtAndEquitySecuritiesUnrealizedGainLosshttp://fasb.org/us-gaap/2023#DebtAndEquitySecuritiesRealizedGainLosshttp://fasb.org/us-gaap/2023#DebtAndEquitySecuritiesUnrealizedGainLosshttp://fasb.org/us-gaap/2023#DebtAndEquitySecuritiesUnrealizedGainLosshttp://fasb.org/us-gaap/2023#DebtAndEquitySecuritiesUnrealizedGainLoss00015129312023-01-012023-12-3100015129312023-06-30iso4217:USD00015129312024-03-08xbrli:shares0001512931mrcc:BusinessAndStructureRiskMember2023-01-012023-12-31xbrli:pure0001512931mrcc:InvestmentsRelatedRiskMember2023-01-012023-12-310001512931mrcc:CommonStockRelatedRisksMember2023-01-012023-12-310001512931mrcc:A2026NotesRelatedRisksMember2023-01-012023-12-310001512931mrcc:GeneralRiskFactorsMember2023-01-012023-12-3100015129312023-12-31iso4217:USDxbrli:shares00015129312023-10-012023-12-3100015129312023-09-3000015129312023-07-012023-09-3000015129312023-04-012023-06-3000015129312023-03-3100015129312023-01-012023-03-3100015129312022-12-3100015129312022-10-012022-12-3100015129312022-09-3000015129312022-07-012022-09-3000015129312022-06-3000015129312022-04-012022-06-3000015129312022-03-3100015129312022-01-012022-03-310001512931mrcc:RevolvingCreditFacilityOneMember2023-12-310001512931mrcc:RevolvingCreditFacilityOneMember2022-12-310001512931mrcc:RevolvingCreditFacilityOneMember2021-12-310001512931mrcc:RevolvingCreditFacilityOneMember2020-12-310001512931mrcc:RevolvingCreditFacilityOneMember2019-12-310001512931mrcc:RevolvingCreditFacilityOneMember2018-12-310001512931mrcc:RevolvingCreditFacilityOneMember2017-12-310001512931mrcc:RevolvingCreditFacilityOneMember2016-12-310001512931mrcc:RevolvingCreditFacilityOneMember2015-12-310001512931mrcc:RevolvingCreditFacilityOneMember2014-12-310001512931mrcc:A2023NotesMember2020-12-310001512931mrcc:A2023NotesMember2020-01-012020-12-310001512931mrcc:A2023NotesMember2019-12-310001512931mrcc:A2023NotesMember2019-01-012019-12-310001512931mrcc:A2023NotesMember2018-12-310001512931mrcc:A2023NotesMember2018-01-012018-12-310001512931mrcc:A2026NotesMember2023-12-310001512931mrcc:A2026NotesMember2022-12-310001512931mrcc:A2026NotesMember2021-12-310001512931mrcc:SBADebenturesMember2016-12-310001512931mrcc:SBADebenturesMember2015-12-310001512931mrcc:SBADebenturesMember2014-12-310001512931mrcc:RevolvingCreditFacilityOneMember2023-01-012023-12-310001512931us-gaap:RevolvingCreditFacilityMember2022-01-012022-12-310001512931us-gaap:RevolvingCreditFacilityMember2023-12-310001512931us-gaap:RevolvingCreditFacilityMember2022-12-310001512931mrcc:A2023NotesMember2023-01-012023-12-310001512931mrcc:A2026NotesMember2023-01-012023-12-310001512931mrcc:SBADebenturesMember2023-01-012023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMember2022-12-310001512931us-gaap:RevolvingCreditFacilityMember2023-12-310001512931us-gaap:RevolvingCreditFacilityMember2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMember2023-01-012023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMember2022-01-012022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMember2021-01-012021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2021-01-012021-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMember2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMember2021-01-012021-12-3100015129312022-01-012022-12-3100015129312021-01-012021-12-310001512931us-gaap:CommonStockMember2020-12-310001512931us-gaap:AdditionalPaidInCapitalMember2020-12-310001512931us-gaap:RetainedEarningsMember2020-12-3100015129312020-12-310001512931us-gaap:RetainedEarningsMember2021-01-012021-12-310001512931us-gaap:CommonStockMember2021-01-012021-12-310001512931us-gaap:AdditionalPaidInCapitalMember2021-01-012021-12-310001512931us-gaap:CommonStockMember2021-12-310001512931us-gaap:AdditionalPaidInCapitalMember2021-12-310001512931us-gaap:RetainedEarningsMember2021-12-3100015129312021-12-310001512931us-gaap:RetainedEarningsMember2022-01-012022-12-310001512931us-gaap:AdditionalPaidInCapitalMember2022-01-012022-12-310001512931us-gaap:CommonStockMember2022-12-310001512931us-gaap:AdditionalPaidInCapitalMember2022-12-310001512931us-gaap:RetainedEarningsMember2022-12-310001512931us-gaap:RetainedEarningsMember2023-01-012023-12-310001512931us-gaap:AdditionalPaidInCapitalMember2023-01-012023-12-310001512931us-gaap:CommonStockMember2023-12-310001512931us-gaap:AdditionalPaidInCapitalMember2023-12-310001512931us-gaap:RetainedEarningsMember2023-12-310001512931Born To Run, LLC, Senior Secured Loans 12023-12-310001512931Born To Run, LLC, Senior Secured Loans 22023-12-310001512931Hastings Manufacturing Company, Senior Secured Loans 12023-12-310001512931Hastings Manufacturing Company, Senior Secured Loans 22023-12-310001512931Hastings Manufacturing Company, Senior Secured Loans 32023-12-310001512931Hastings Manufacturing Company, Senior Secured Loans, Revolver2023-12-310001512931Lifted Trucks Holdings, LLC, Senior Secured Loans2023-12-310001512931Lifted Trucks Holdings, LLC, Senior Secured Loans, Revolver2023-12-310001512931Panda Acquisition, LLC, Senior Secured Loans2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:AutomotiveSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931MV Receivables II, LLC, Senior Secured Loans2023-12-310001512931StarCompliance MidCo, LLC, Senior Secured Loans 12023-12-310001512931StarCompliance MidCo, LLC, Senior Secured Loans 22023-12-310001512931StarCompliance MidCo, LLC, Senior Secured Loans 32023-12-310001512931StarCompliance MidCo, LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:BankingSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931LVF Holdings, Inc., Senior Secured Loans 12023-12-310001512931LVF Holdings, Inc., Senior Secured Loans 22023-12-310001512931LVF Holdings, Inc., Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FoodAndBeverageSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931CGI Automated Manufacturing, LLC, Senior Secured Loans 12023-12-310001512931CGI Automated Manufacturing, LLC, Senior Secured Loans 22023-12-310001512931us-gaap:SeniorLoansMembermrcc:CapitalEquipmentMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Valudor Products LLC, Senior Secured Loans 12023-12-310001512931Valudor Products LLC, Senior Secured Loans 22023-12-310001512931Valudor Products LLC, Senior Secured Loans 32023-12-310001512931Valudor Products LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:ChemicalsSectorMember2023-12-310001512931MEI Buyer LLC, Senior Secured Loans2023-12-310001512931MEI Buyer LLC , Senior Secured Loans, Delayed Draw2023-12-310001512931MEI Buyer LLC, Senior Secured Loans Revolver2023-12-310001512931TCFIII OWL Buyer LLC, Senior Secured Loans 12023-12-310001512931TCFIII OWL Buyer LLC, Senior Secured Loans 22023-12-310001512931TCFIII OWL Buyer LLC, Senior Secured Loans 32023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:ConstructionSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Independence Buyer, Inc., Senior Secured Loans2023-12-310001512931Independence Buyer, Inc., Senior Secured Loans, Revolver2023-12-310001512931Recycled Plastics Industries, LLC, Senior Secured Loans2023-12-310001512931Recycled Plastics Industries, LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ConsumerGoodsDurableMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931The Kyjen Company, LLC, Senior Secured Loans 12023-12-310001512931The Kyjen Company, LLC, Senior Secured Loans 22023-12-310001512931The Kyjen Company, LLC, Senior Secured Loans, Revolver2023-12-310001512931Thrasio, LLC, Senior Secured Loans2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:ConsumerSectorNon-DurableMember2023-12-310001512931Quest Resource Management Group, LLC, Senior Secured Loans 12023-12-310001512931Quest Resource Management Group, LLC, Senior Secured Loans 22023-12-310001512931Quest Resource Management Group, LLC, Senior Secured Loans 32023-12-310001512931Quest Resource Management Group, LLC, Senior Secured Loans 42023-12-310001512931us-gaap:SeniorLoansMembermrcc:EnvironmentalIndustriesMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Avalara, Inc., Senior Secured Loans2023-12-310001512931Avalara, Inc., Senior Secured Loans, Revolver2023-12-310001512931GC Champion Acquisition LLC, Senior Secured Loans 12023-12-310001512931GC Champion Acquisition LLC, Senior Secured Loans 22023-12-310001512931GC Champion Acquisition LLC, Senior Secured Loans 32023-12-310001512931J2 BWA Funding LLC, Senior Secured Loans, Revolver2023-12-310001512931Liftforward SPV II, LLC, Senior Secured Loans2023-12-310001512931W3 Monroe RE Debt LLC, Senior Secured Loans2023-12-310001512931W3 Monroe RE Debt LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931us-gaap:SeniorLoansMembermrcc:FireFinanceSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans 12023-12-310001512931Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans 22023-12-310001512931Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Bluesight, Inc., Senior Secured Loans2023-12-310001512931Bluesight, Inc., Senior Secured Loans, Revolver2023-12-310001512931Brickell Bay Acquisition Corp., Senior Secured Loans2023-12-310001512931Caravel Autism Health, LLC, Senior Secured Loans 12023-12-310001512931Caravel Autism Health, LLC, Senior Secured Loans 22023-12-310001512931Caravel Autism Health, LLC, Senior Secured Loans, Revolver2023-12-310001512931Dorado Acquisition, Inc., Senior Secured Loans 12023-12-310001512931Dorado Acquisition, Inc., Senior Secured Loans 22023-12-310001512931Dorado Acquisition, Inc., Senior Secured Loans, Revolver2023-12-310001512931INH Buyer, Inc., Senior Secured Loans2023-12-310001512931KL Moon Acquisition, LLC (fka Spectrum Science Communications, LLC), Senior Secured Loans2023-12-310001512931KL Moon Acquisition, LLC (fka Spectrum Science Communications, LLC), Senior Secured Loans, Delayed Draw2023-12-310001512931KL Moon Acquisition, LLC (fka Spectrum Science Communications, LLC), Senior Secured Loans, Revolver2023-12-310001512931NationsBenefits, LLC, Senior Secured Loans 12023-12-310001512931NationsBenefits, LLC, Senior Secured Loans 22023-12-310001512931NationsBenefits, LLC, Senior Secured Loans 32023-12-310001512931NationsBenefits, LLC, Senior Secured Loans, Revolver2023-12-310001512931NQ PE Project Colosseum Midco Inc., Senior Secured Loans2023-12-310001512931NQ PE Project Colosseum Midco Inc., Senior Secured Loans, Delayed Draw2023-12-310001512931NQ PE Project Colosseum Midco Inc., Senior Secured Loans, Revolver2023-12-310001512931Seran BioScience, LLC, Senior Secured Loans 12023-12-310001512931Seran BioScience, LLC, Senior Secured Loans 22023-12-310001512931Seran BioScience, LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931Seran BioScience, LLC, Senior Secured Loans, Revolver2023-12-310001512931TigerConnect, Inc., Senior Secured Loans2023-12-310001512931TigerConnect, Inc., Senior Secured Loans, Delayed Draw2023-12-310001512931TigerConnect, Inc., Senior Secured Loans, Revolver2023-12-310001512931Vero Biotech Inc., Senior Secured Loans2023-12-310001512931Whistler Parent Holdings III, Inc., Senior Secured Loans 12023-12-310001512931Whistler Parent Holdings III, Inc., Senior Secured Loans 22023-12-310001512931Whistler Parent Holdings III, Inc., Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:HealthcareSectorMember2023-12-310001512931Amelia Holding II, LLC, Senior Secured Loans2023-12-310001512931Amelia Holding II, LLC , Senior Secured Loans, Delayed Draw2023-12-310001512931Amelia Holding II, LLC, Senior Secured Loans, Revolver2023-12-310001512931Arcstor Midco, LLC, Senior Secured Loans2023-12-310001512931Drawbridge Partners, LLC, Senior Secured Loans2023-12-310001512931Drawbridge Partners, LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931Drawbridge Partners, LLC, Senior Secured Loans Revolver2023-12-310001512931Medallia, Inc., Senior Secured Loans2023-12-310001512931Mindbody, Inc., Senior Secured Loans 12023-12-310001512931Mindbody, Inc., Senior Secured Loans 22023-12-310001512931Mindbody, Inc., Senior Secured Loans, Revolver2023-12-310001512931Planful, Inc., Senior Secured Loans 12023-12-310001512931Planful, Inc., Senior Secured Loans 22023-12-310001512931Planful, Inc., Senior Secured Loans 32023-12-310001512931Planful, Inc., Senior Secured Loans 42023-12-310001512931Planful, Inc., Senior Secured Loans 52023-12-310001512931Planful, Inc., Senior Secured Loans, Revolver2023-12-310001512931Sparq Holdings, Inc., Senior Secured Loans2023-12-310001512931Sparq Holdings, Inc., Senior Secured Loans, Delayed Draw2023-12-310001512931Sparq Holdings, Inc., Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:HighTechIndustriesSectorMember2023-12-310001512931Destination Media, Inc., Senior Secured Loans2023-12-310001512931Destination Media, Inc., Senior Secured Loans, Delayed Draw2023-12-310001512931Destination Media, Inc., Senior Secured Loans, Revolver2023-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 12023-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 22023-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 32023-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 42023-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans, Delayed Draw2023-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans, Revolver2023-12-310001512931Relevate Health Group, LLC, Senior Secured Loans 12023-12-310001512931Relevate Health Group, LLC, Senior Secured Loans 22023-12-310001512931Relevate Health Group, LLC, Senior Secured Loans, Revolver2023-12-310001512931Spherix Global Inc., Senior Secured Loans2023-12-310001512931Spherix Global Inc., Senior Secured Loans, Revolver2023-12-310001512931XanEdu Publishing, Inc., Senior Secured Loans 12023-12-310001512931XanEdu Publishing, Inc., Senior Secured Loans 22023-12-310001512931XanEdu Publishing, Inc., Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MediaAdvertisingPrintingPublishingMember2023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Senior Secured Loans 12023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Senior Secured Loans 22023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Senior Secured Loans, Delayed Draw2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MediaBroadcastingSubscriptionMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 12023-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 22023-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 32023-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 42023-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 52023-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans, Revolver2023-12-310001512931Bonterra, LLC, Senior Secured Loans 12023-12-310001512931Bonterra, LLC, Senior Secured Loans 22023-12-310001512931Bonterra, LLC, Senior Secured Loans, Revolver2023-12-310001512931Chess.com, LLC, Senior Secured Loans2023-12-310001512931Chess.com, LLC, Senior Secured Loans Revolver2023-12-310001512931Crownpeak Technology, Inc. , Senior Secured Loans12023-12-310001512931Crownpeak Technology, Inc., Senior Secured Loans 22023-12-310001512931Crownpeak Technology, Inc., Senior Secured Loans 32023-12-310001512931Crownpeak Technology, Inc., Senior Secured Loans 42023-12-310001512931Crownpeak Technology, Inc., Senior Secured Loans, Revolver2023-12-310001512931Sports Operating Holdings II, LLC, Senior Secured Loans2023-12-310001512931Sports Operating Holdings II, LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931Sports Operating Holdings II, LLC, Senior Secured Loans, Revolver2023-12-310001512931V10 Entertainment, Inc., Senior Secured Loans2023-12-310001512931V10 Entertainment, Inc., Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MediaDiversifiedProductionMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931BLST Operating Company, LLC, Senior Secured Loans2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:RetailSectorMember2023-12-310001512931Aras Corporation2023-12-310001512931Aras Corporation (Revolver) 2023-12-310001512931Burroughs, Inc.2023-12-310001512931Burroughs, Inc. (Revolver)2023-12-310001512931HS4 Acquisitionco, Inc.2023-12-310001512931HS4 Acquisitionco, Inc. (Revolver)2023-12-310001512931iCIMS, Inc.2023-12-310001512931Kingsley Gate Partners, LLC 12023-12-310001512931Kingsley Gate Partners, LLC 22023-12-310001512931Kingsley Gate Partners, LLC (Delayed Draw) 2023-12-310001512931Kingsley Gate Partners, LLC (Revolver) 2023-12-310001512931Prototek LLC2023-12-310001512931Prototek LLC (Revolver) 2023-12-310001512931Relativity ODA LLC2023-12-310001512931Relativity ODA LLC, Senior Secured Loans, Revolver2023-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 12023-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 22023-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 32023-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 42023-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 52023-12-310001512931Vhagar Purchaser, LLC, Senior Secured Loans2023-12-310001512931Vhagar Purchaser, LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931Vhagar Purchaser, LLC, Senior Secured Loans, Revolver2023-12-310001512931VPS Holdings, LLC, Senior Secured Loans 12023-12-310001512931VPS Holdings, LLC, Senior Secured Loans 22023-12-310001512931VPS Holdings, LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Express Wash Acquisition Company, LLC, Senior Secured Loans 12023-12-310001512931Express Wash Acquisition Company, LLC, Senior Secured Loans 22023-12-310001512931Express Wash Acquisition Company, LLC, Senior Secured Loans Revolver2023-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans 12023-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans 22023-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931American Broadband and Telecommunications Company LLC, Senior Secured Loans, Delayed Draw2023-12-310001512931American Broadband and Telecommunications Company LLC, Senior Secured Loans, Revolver2023-12-310001512931Calabrio, Inc., Senior Secured Loans2023-12-310001512931Calabrio, Inc., Senior Secured Loans, Delayed Draw2023-12-310001512931Calabrio, Inc., Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Nearly Natural, Inc., Senior Secured Loans 12023-12-310001512931Nearly Natural, Inc., Senior Secured Loans 22023-12-310001512931Nearly Natural, Inc., Senior Secured Loans 32023-12-310001512931Nearly Natural, Inc., Senior Secured Loans 42023-12-310001512931Nearly Natural, Inc., Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:WholesaleMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Cassavant Holdings, LLC, Unitranche Secured Loans2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMemberus-gaap:AerospaceSectorMember2023-12-310001512931ASG II, LLC, Unitranche Secured Loans2023-12-310001512931ASG II, LLC, Unitranche Secured Loans, Delayed Draw2023-12-310001512931Onit, Inc., Unitranche Secured Loans2023-12-310001512931mrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMember2023-12-310001512931VB E1, LLC, Unitranche Secured Loans2023-12-310001512931mrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMember2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMember2023-12-310001512931MoneyLion, Inc., Junior Secured Loans2023-12-310001512931us-gaap:JuniorLoansMembermrcc:BankingSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Florida East Coast Industries, LLC, Junior Secured Loans2023-12-310001512931Witkoff/Monroe 700 JV LLC, Junior Secured Loans 12023-12-310001512931Witkoff/Monroe 700 JV LLC, Junior Secured Loans 22023-12-310001512931Witkoff/Monroe 700 JV LLC, Junior Secured Loans, Delayed Draw2023-12-310001512931us-gaap:JuniorLoansMembermrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Arcstor Midco, LLC, Junior Secured Loans 12023-12-310001512931Arcstor Midco, LLC, Junior Secured Loans 22023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:HighTechIndustriesSectorMember2023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Junior Secured Loans12023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Junior Secured Loans 22023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Junior Secured Loans 32023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Junior Secured Loans 42023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Junior Secured Loans 52023-12-310001512931us-gaap:JuniorLoansMembermrcc:MediaBroadcastingSubscriptionMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Forman Mills, Inc., Junior Secured Loans2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:RetailSectorMember2023-12-310001512931Education Corporation of America, Junior Secured Loans2023-12-310001512931us-gaap:JuniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMember2023-12-310001512931Born To Run, LLC, Equity Securities, Class A units2023-12-310001512931Lifted Trucks Holdings, LLC, Equity Securities, Class A units2023-12-310001512931us-gaap:AutomotiveSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931MV Receivables II, LLC, Equity Securities, Common units2023-12-310001512931MV Receivables II, LLC, Equity Securities, Warrant2023-12-310001512931mrcc:BankingSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Valudor Products LLC, Equity Securities, Class A-1 units2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMemberus-gaap:ChemicalsSectorMember2023-12-310001512931Independence Buyer, Inc., Equity Securities, Class A units2023-12-310001512931mrcc:ConsumerGoodsDurableMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931MEI Buyer LLC, Equity Securities, Common stock2023-12-310001512931us-gaap:ConstructionSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Quest Resource Management Group, LLC, Equity Securities, Warrant 12023-12-310001512931Quest Resource Management Group, LLC, Equity Securities, Warrant 22023-12-310001512931mrcc:EnvironmentalIndustriesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931J2 BWA Funding LLC, Equity Securities, Profit sharing2023-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 12023-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 22023-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 32023-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 42023-12-310001512931mrcc:FireFinanceSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Witkoff/Monroe 700 JV LLC, Equity Securities, Preferred units2023-12-310001512931mrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Bluesight, Inc., Equity Securities, Class A preferred units2023-12-310001512931Bluesight, Inc. , Equity Securities, Class B common units2023-12-310001512931Dorado Acquisition, Inc., Equity Securities, Class A-1 units2023-12-310001512931Dorado Acquisition, Inc., Equity Securities, Class A-2 units2023-12-310001512931KL Moon Acquisition, LLC (fka Spectrum Science Communications, LLC), Equity Securities2023-12-310001512931NationsBenefits, LLC, Equity Securities, Series B units2023-12-310001512931NationsBenefits, LLC, Equity Securities, Common units2023-12-310001512931NQ PE Project Colosseum Midco Inc., Equity Securities, Common units2023-12-310001512931Seran BioScience, LLC, Equity Securities, Common units2023-12-310001512931Vero Biotech Inc., Equity Securities, Warrant2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:HealthcareSectorMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Amelia Holding II, LLC, Equity Securities, Warrant2023-12-310001512931Drawbridge Partners, LLC, Equity Securities, Class A-1 units2023-12-310001512931Planful, Inc., Equity Securities, Class A units2023-12-310001512931Planful, Inc., Equity Securities, Class B units2023-12-310001512931Recorded Future, Inc, Equity Securities Class A units2023-12-310001512931Sparq Holdings, Inc., Equity Securities, Common stock2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:HighTechIndustriesSectorMember2023-12-310001512931Equine Network, LLC, Equity Securities, Class A units2023-12-310001512931mrcc:HotelsGamingLeisureMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931AdTheorent Holding Company, Inc, Equity Securities, Common stock2023-12-310001512931InMobi Pte, Ltd, Equity Securities, Warrant2023-12-310001512931Relevate Health Group, LLC , Equity Securities, Preferred units2023-12-310001512931Relevate Health Group, LLC , Equity Securities, Class B common units2023-12-310001512931Spherix Global Inc., Equity Securities, Class A units2023-12-310001512931XanEdu Publishing, Inc., Equity Securities, Class A units2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:MediaAdvertisingPrintingPublishingMember2023-12-310001512931Vice Acquisition Holdco, LLC (fka Vice Group Holding Inc.), Equity Securities, Class A units2023-12-310001512931mrcc:MediaBroadcastingSubscriptionMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Attom Intermediate Holdco, LLC, Equity Securities, Class A units2023-12-310001512931Chess.com, LLC, Equity Securities, Class A units2023-12-310001512931V10 Entertainment, Inc. , Equity Securities, Common units2023-12-310001512931mrcc:MediaDiversifiedProductionMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931BLST Operating Company, LLC, Equity Securities, Class A units2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMemberus-gaap:RetailSectorMember2023-12-310001512931APCO Worldwide, Inc., Equity Securities, Class A voting common stock2023-12-310001512931mrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Education Corporation of America - Series G Preferred Stock2023-12-310001512931Express Wash Acquisition Company, LLC, Equity Securities, Class A common units2023-12-310001512931Express Wash Acquisition Company, LLC, Class A preferred units2023-12-310001512931Express Wash Acquisition Company, LLC, Equity Securities, Class B preferred units2023-12-310001512931Express Wash Acquisition Company, LLC, Equity Securities, Class B common units2023-12-310001512931IDIG Parent, LLC, Equity Securities, Common stock2023-12-310001512931Kar Wash Holdings, LLC 1, Equity Securities, Class A units2023-12-310001512931Kar Wash Holdings, LLC, Equity Securities, Series A Preferred Stock2023-12-310001512931mrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931American Broadband and Telecommunications Company LLC, Warrants2023-12-310001512931mrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Nearly Natural, Inc.1, Equity Securities, Class A units2023-12-310001512931Nearly Natural, Inc. 2, Equity Securities, Class AA units2023-12-310001512931mrcc:WholesaleMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2023-12-310001512931TJ Management HoldCo LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:FoodAndBeverageSectorMember2023-12-310001512931American Community Homes, Inc., Senior Secured Loans 12023-12-310001512931American Community Homes, Inc., Senior Secured Loans 22023-12-310001512931American Community Homes, Inc., Senior Secured Loans 32023-12-310001512931American Community Homes, Inc., Senior Secured Loans 42023-12-310001512931American Community Homes, Inc., Senior Secured Loans 52023-12-310001512931American Community Homes, Inc., Senior Secured Loans 62023-12-310001512931American Community Homes, Inc., Senior Secured Loans 72023-12-310001512931American Community Homes, Inc., Senior Secured Loans, Revolver2023-12-310001512931HFZ Capital Group LLC, Senior Secured Loans 12023-12-310001512931HFZ Capital Group LLC, Senior Secured Loans) 22023-12-310001512931MC Asset Management (Corporate), LLC, Senior Secured Loans 12023-12-310001512931MC Asset Management (Corporate), LLC, Senior Secured Loans 22023-12-310001512931Second Avenue SFR Holdings II LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FireRealEstateSectorMember2023-12-310001512931Mnine Holdings, Inc., Senior Secured Loans 12023-12-310001512931Mnine Holdings, Inc., Senior Secured Loans 22023-12-310001512931Mnine Holdings, Inc., Revolver, Senior Secured Loans 2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HighTechIndustriesSectorMember2023-12-310001512931NECB Collections, LLC, Senior Secured Loans, Revolver2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001512931SFR Holdco, LLC, Junior Secured Loans2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FireRealEstateSectorMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001512931TJ Management HoldCo LLC, Equity Securities, Common stock2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:FoodAndBeverageSectorMemberus-gaap:EquitySecuritiesMember2023-12-310001512931American Community Homes, Inc., Equity Securities, Common stock2023-12-310001512931MC Asset Management (Corporate), LLC, Equity Securities2023-12-310001512931SFR Holdco, LLC, Equity Securities2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FireRealEstateSectorMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Ascent Midco, LLC, Equity Securities, Class A units2023-12-310001512931Familia Dental Group Holdings, LLC, Equity Securities, Class A units2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:HealthcareSectorMemberus-gaap:EquitySecuritiesMember2023-12-310001512931Mnine Holdings, Inc., Equity Securities, Class B units2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:EquitySecuritiesMembermrcc:HighTechIndustriesSectorMember2023-12-310001512931NECB Collections, LLC, Equity Securities2023-12-310001512931mrcc:ServicesConsumerSectorMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:EquitySecuritiesMember2023-12-310001512931MRCC Senior Loan Fund I, LLC, Equity Securities2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMemberus-gaap:EquitySecuritiesMember2023-12-310001512931mrcc:FamiliaDentalGroupHoldingsLLCMember2023-01-012023-12-310001512931mrcc:ViceOldCoMember2023-12-310001512931mrcc:RecordedFutureIncMember2023-12-310001512931mrcc:V10EntertainmentInc.Member2023-12-310001512931mrcc:IDIGParentLLCMember2023-12-310001512931mrcc:McAssetManagementCorporateLlcCorporateMembermrcc:McAssetManagementCorporateLlcCorporateMember2020-12-310001512931mrcc:McAssetManagementIndustrialLlcIndustrialMembermrcc:McAssetManagementCorporateLlcCorporateMember2020-12-310001512931mrcc:HfzCapitalGroupLlcMember2020-12-310001512931Born To Run, LLC, Senior Secured Loans 12022-12-310001512931Born To Run, LLC, Senior Secured Loans 22022-12-310001512931Hastings Manufacturing Company, Senior Secured Loans2022-12-310001512931Lifted Trucks Holdings, LLC, Senior Secured Loans2022-12-310001512931Lifted Trucks Holdings, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Lifted Trucks Holdings, LLC, Senior Secured Loans, Revolver2022-12-310001512931Panda Acquisition, LLC, Senior Secured Loans2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:AutomotiveSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931MV Receivables II, LLC, Senior Secured Loans2022-12-310001512931StarCompliance MidCo, LLC, Senior Secured Loans 12022-12-310001512931StarCompliance MidCo, LLC, Senior Secured Loans 22022-12-310001512931StarCompliance MidCo, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:BankingSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931LVF Holdings, Inc., Senior Secured Loans 12022-12-310001512931LVF Holdings, Inc., Senior Secured Loans 22022-12-310001512931LVF Holdings, Inc., Senior Secured Loans, Delayed Draw2022-12-310001512931LVF Holdings, Inc., Senior Secured Loans Revolver2022-12-310001512931LX/JT Intermediate Holdings, Inc.2022-12-310001512931LX/JT Intermediate Holdings, Inc., Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FoodAndBeverageSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931CGI Automated Manufacturing, LLC, Senior Secured Loans 12022-12-310001512931CGI Automated Manufacturing, LLC, Senior Secured Loans 22022-12-310001512931MCP Shaw Acquisitionco, LLC, Senior Secured Loans 12022-12-310001512931MCP Shaw Acquisitionco, LLC, Senior Secured Loans 22022-12-310001512931MCP Shaw Acquisitionco, LLC, Senior Secured Loans 32022-12-310001512931MCP Shaw Acquisitionco, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:CapitalEquipmentMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Valudor Products LLC, Senior Secured Loans 12022-12-310001512931Valudor Products LLC, Senior Secured Loans 22022-12-310001512931Valudor Products LLC, Senior Secured Loans 32022-12-310001512931Valudor Products LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:ChemicalsSectorMember2022-12-310001512931TCFIII OWL Buyer LLC, Senior Secured Loans 12022-12-310001512931TCFIII OWL Buyer LLC, Senior Secured Loans 22022-12-310001512931TCFIII OWL Buyer LLC, Senior Secured Loans 32022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:ConstructionSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Independence Buyer, Inc., Senior Secured Loans2022-12-310001512931Independence Buyer, Inc., Senior Secured Loans, Revolver2022-12-310001512931Recycled Plastics Industries, LLC, Senior Secured Loans2022-12-310001512931Recycled Plastics Industries, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ConsumerGoodsDurableMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931The Kyjen Company, LLC, Senior Secured Loans 12022-12-310001512931The Kyjen Company, LLC, Senior Secured Loans 22022-12-310001512931The Kyjen Company, LLC, Senior Secured Loans, Revolver2022-12-310001512931Thrasio, LLC, Senior Secured Loans2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:ConsumerSectorNon-DurableMember2022-12-310001512931Quest Resource Management Group, LLC Senior Secured Loans 12022-12-310001512931Quest Resource Management Group, LLC Senior Secured Loans 22022-12-310001512931Quest Resource Management Group, LLC Senior Secured Loans 32022-12-310001512931Quest Resource Management Group, LLC, (Delayed Draw)2022-12-310001512931us-gaap:SeniorLoansMembermrcc:EnvironmentalIndustriesMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Avalara, Inc., Senior Secured Loans2022-12-310001512931Avalara, Inc., Senior Secured Loans, Revolver2022-12-310001512931GC Champion Acquisition LLC, Senior Secured Loans2022-12-310001512931GC Champion Acquisition LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931J2 BWA Funding LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Liftforward SPV II, LLC, Senior Secured Loans2022-12-310001512931Oceana Australian Fixed Income Trust, Senior Secured Loans 12022-12-310001512931Oceana Australian Fixed Income Trust, Senior Secured Loans 22022-12-310001512931W3 Monroe RE Debt LLC, Senior Secured Loans2022-12-310001512931YS WH4 LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:FireFinanceSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans 12022-12-310001512931Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans 22022-12-310001512931Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans, (Revolver2022-12-310001512931Florida East Coast Industries, LLC, Senior Secured Loans2022-12-310001512931NCBP Property, LLC, Senior Secured Loans2022-12-310001512931us-gaap:SeniorLoansMembermrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Brickell Bay Acquisition Corp., Senior Secured Loans2022-12-310001512931Caravel Autism Health, LLC, Senior Secured Loans2022-12-310001512931Caravel Autism Health, LLC, Senior Secured Loans Delayed Draw2022-12-310001512931Caravel Autism Health, LLC, Senior Secured Loans, Revolver2022-12-310001512931Dorado Acquisition, Inc., Senior Secured Loans 12022-12-310001512931Dorado Acquisition, Inc., Senior Secured Loans 22022-12-310001512931Dorado Acquisition, Inc., Senior Secured Loans Delayed Draw2022-12-310001512931Dorado Acquisition, Inc., Senior Secured Loans Revolver2022-12-310001512931INH Buyer, Inc., Senior Secured Loans2022-12-310001512931NationsBenefits, LLC, Senior Secured Loans 12022-12-310001512931NationsBenefits, LLC, Senior Secured Loans 22022-12-310001512931NationsBenefits, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931NationsBenefits, LLC, Senior Secured Loans, Revolver2022-12-310001512931NQ PE Project Colosseum Midco Inc., Senior Secured Loans2022-12-310001512931NQ PE Project Colosseum Midco Inc., Senior Secured Loans, Delayed Draw)2022-12-310001512931NQ PE Project Colosseum Midco Inc., Senior Secured Loans, Revolver2022-12-310001512931Rockdale Blackhawk, LLC, Senior Secured Loans2022-12-310001512931Seran BioScience, LLC, Senior Secured Loans2022-12-310001512931Seran BioScience, LLC, Senior Secured Loans Delayed Draw2022-12-310001512931Seran BioScience, LLC, Senior Secured Loans, Revolver2022-12-310001512931TigerConnect, Inc., Senior Secured Loans2022-12-310001512931TigerConnect, Inc., Senior Secured Loans, Delayed Draw2022-12-310001512931TigerConnect, Inc., Senior Secured Loans Revolver2022-12-310001512931Whistler Parent Holdings III, Inc., Senior Secured Loans2022-12-310001512931Whistler Parent Holdings III, Inc., Senior Secured Loans Delayed Draw2022-12-310001512931Whistler Parent Holdings III, Inc., Senior Secured Loans Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:HealthcareSectorMember2022-12-310001512931Amelia Holding II, LLC, Senior Secured Loans2022-12-310001512931Amelia Holding II, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Amelia Holding II, LLC, Senior Secured Loans, Revolver2022-12-310001512931Arcstor Midco, LLC, Senior Secured Loans2022-12-310001512931Drawbridge Partners, LLC, Senior Secured Loans2022-12-310001512931Drawbridge Partners, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Drawbridge Partners, LLC, Senior Secured Loans, Revolver2022-12-310001512931MarkLogic Corporation, Senior Secured Loans 12022-12-310001512931MarkLogic Corporation, Senior Secured Loans 22022-12-310001512931MarkLogic Corporation, Senior Secured Loans 32022-12-310001512931MarkLogic Corporation, Senior Secured Loans 42022-12-310001512931MarkLogic Corporation, Senior Secured Loans, Revolver2022-12-310001512931Medallia, Inc., Senior Secured Loans2022-12-310001512931Mindbody, Inc., Senior Secured Loans 12022-12-310001512931Mindbody, Inc., Senior Secured Loans 22022-12-310001512931Mindbody, Inc., Senior Secured Loans, Revolver2022-12-310001512931Newforma, Inc., Senior Secured Loans2022-12-310001512931Newforma, Inc., Senior Secured Loans, Revolver2022-12-310001512931Planful, Inc., Senior Secured Loans 12022-12-310001512931Planful, Inc., Senior Secured Loans 22022-12-310001512931Planful, Inc., Senior Secured Loans 32022-12-310001512931Planful, Inc., Senior Secured Loans 42022-12-310001512931Planful, Inc., Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:HighTechIndustriesSectorMember2022-12-310001512931Equine Network, LLC, Senior Secured Loans 12022-12-310001512931Equine Network, LLC, Senior Secured Loans 22022-12-310001512931Equine Network, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Equine Network, LLC, Senior Secured Loans Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:HotelsGamingLeisureMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Destination Media, Inc., Senior Secured Loans2022-12-310001512931Destination Media, Inc., Senior Secured Loans, Revolver2022-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 12022-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 22022-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 32022-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans 42022-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans, Delayed Draw2022-12-310001512931North Haven USHC Acquisition, Inc., Senior Secured Loans Revolver2022-12-310001512931Relevate Health Group, LLC, Senior Secured Loans2022-12-310001512931Relevate Health Group, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Relevate Health Group, LLC, Senior Secured Loans Revolver2022-12-310001512931Spherix Global Inc., Senior Secured Loans2022-12-310001512931Spherix Global Inc., Senior Secured Loans, Revolver2022-12-310001512931XanEdu Publishing, Inc., Senior Secured Loans 12022-12-310001512931XanEdu Publishing, Inc., Senior Secured Loans 22022-12-310001512931XanEdu Publishing, Inc., Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MediaAdvertisingPrintingPublishingMember2022-12-310001512931Vice Group Holding Inc., Senior Secured Loans 12022-12-310001512931Vice Group Holding Inc., Senior Secured Loans 22022-12-310001512931Vice Group Holding Inc., Senior Secured Loans 32022-12-310001512931Vice Group Holding Inc., Senior Secured Loans 42022-12-310001512931us-gaap:SeniorLoansMembermrcc:MediaBroadcastingSubscriptionMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 12022-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 22022-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 32022-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 42022-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans 52022-12-310001512931Attom Intermediate Holdco, LLC, Senior Secured Loans, Revolver2022-12-310001512931Bonterra, LLC (fka Cybergrants Holdings), Senior Secured Loans2022-12-310001512931Bonterra, LLC (fka Cybergrants Holdings), Senior Secured Loans, Delayed Draw2022-12-310001512931Bonterra, LLC (fka Cybergrants Holdings), Senior Secured Loans, Revolver2022-12-310001512931Chess.com, LLC, Senior Secured Loans2022-12-310001512931Chess.com, LLC, Senior Secured Loans, Revolver2022-12-310001512931Crownpeak Technology, Inc., Senior Secured Loans 12022-12-310001512931Crownpeak Technology, Inc., Senior Secured Loans 22022-12-310001512931Crownpeak Technology, Inc. , Senior Secured Loans32022-12-310001512931Crownpeak Technology, Inc. , Senior Secured Loans42022-12-310001512931Crownpeak Technology, Inc., Senior Secured Loans, Revolver2022-12-310001512931Spectrum Science Communications, LLC, Senior Secured Loans2022-12-310001512931Spectrum Science Communications, LLC, Senior Secured Loans, Revolver2022-12-310001512931Sports Operating Holdings II, LLC, Senior Secured Loans2022-12-310001512931Sports Operating Holdings II, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Sports Operating Holdings II, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MediaDiversifiedProductionMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931BLST Operating Company, LLC, Senior Secured Loans2022-12-310001512931Forman Mills, Inc., Senior Secured Loans 12022-12-310001512931Forman Mills, Inc, Senior Secured Loans. 22022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:RetailSectorMember2022-12-310001512931Aras Corporation, Senior Secured Loans2022-12-310001512931Aras Corporation, Senior Secured Loans, Revolver2022-12-310001512931Burroughs, Inc., Senior Secured Loans2022-12-310001512931Burroughs, Inc., Senior Secured Loans, Revolver2022-12-310001512931HS4 Acquisitionco, Inc., Senior Secured Loans2022-12-310001512931HS4 Acquisitionco, Inc., Senior Secured Loans, Revolver2022-12-310001512931iCIMS, Inc., Senior Secured Loans2022-12-310001512931Kingsley Gate Partners, LLC, Senior Secured Loans2022-12-310001512931Kingsley Gate Partners, LLC, Senior Secured Loans, Delayed Draw 12022-12-310001512931Kingsley Gate Partners, LLC, Senior Secured Loans, Delayed Draw 22022-12-310001512931Kingsley Gate Partners, LLC, Senior Secured Loans, Revolver2022-12-310001512931Prototek LLC, Senior Secured Loans2022-12-310001512931Prototek LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Prototek LLC, Senior Secured Loans, Revolver2022-12-310001512931Relativity ODA LLC, Senior Secured Loans2022-12-310001512931Relativity ODA LLC, Senior Secured Loans, Revolver2022-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 12022-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 22022-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 32022-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 42022-12-310001512931Security Services Acquisition Sub Corp., Senior Secured Loans 52022-12-310001512931ServiceMax, Inc., Senior Secured Loans2022-12-310001512931ServiceMax, Inc., Senior Secured Loans, Revolver2022-12-310001512931VPS Holdings, LLC, Senior Secured Loans 12022-12-310001512931VPS Holdings, LLC, Senior Secured Loans 22022-12-310001512931VPS Holdings, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Express Wash Acquisition Company, LLC, Senior Secured Loans 12022-12-310001512931Express Wash Acquisition Company, LLC, Senior Secured Loans 22022-12-310001512931Express Wash Acquisition Company, LLC, Senior Secured Loans, Revolver2022-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans 12022-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans 22022-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Kar Wash Holdings, LLC, Senior Secured Loans, Revolver2022-12-310001512931Mammoth Holdings, LLC, Senior Secured Loans 12022-12-310001512931Mammoth Holdings, LLC, Senior Secured Loans 22022-12-310001512931Mammoth Holdings, LLC, Senior Secured Loans 32022-12-310001512931Mammoth Holdings, LLC, Senior Secured Loans 42022-12-310001512931Mammoth Holdings, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931American Broadband and Telecommunications Company LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931American Broadband and Telecommunications Company LLC, Senior Secured Loans, Revolver2022-12-310001512931Calabrio, Inc., Senior Secured Loans2022-12-310001512931Calabrio, Inc., Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Nearly Natural, Inc., Senior Secured Loans 12022-12-310001512931Nearly Natural, Inc., Senior Secured Loans 22022-12-310001512931Nearly Natural, Inc. , Senior Secured Loans32022-12-310001512931Nearly Natural, Inc., Senior Secured Loans 42022-12-310001512931Nearly Natural, Inc., Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:WholesaleMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Cassavant Holdings, LLC, Unitranche Secured Loans2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMemberus-gaap:AerospaceSectorMember2022-12-310001512931Vinci Brands LLC, Unitranche Secured Loans 12022-12-310001512931Vinci Brands LLC, Unitranche Secured Loans 22022-12-310001512931Vinci Brands LLC, Unitranche Secured Loans 32022-12-310001512931Vinci Brands LLC, Unitranche Secured Loans 42022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMembermrcc:ConsumerSectorNon-DurableMember2022-12-310001512931WillowTree, LLC, Unitranche Secured Loans2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMembermrcc:HighTechIndustriesSectorMember2022-12-310001512931ASG II, LLC, Unitranche Secured Loans2022-12-310001512931ASG II, LLC, Unitranche Secured Loans, Delayed Draw2022-12-310001512931Onit, Inc., Unitranche Secured Loans2022-12-310001512931mrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMember2022-12-310001512931VB E1, LLC, Unitranche Secured Loans2022-12-310001512931mrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMember2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:UnitrancheDebtMember2022-12-310001512931MoneyLion, Inc., Junior Secured Loans 12022-12-310001512931MoneyLion, Inc., Junior Secured Loans 22022-12-310001512931MoneyLion, Inc., Junior Secured Loans, Delayed Draw2022-12-310001512931us-gaap:JuniorLoansMembermrcc:BankingSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Florida East Coast Industries, LLC, Junior Secured Loans2022-12-310001512931Witkoff/Monroe 700 JV LLC, Junior Secured Loans, Delayed Draw2022-12-310001512931us-gaap:JuniorLoansMembermrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Education Corporation of America, Junior Secured Loans2022-12-310001512931us-gaap:JuniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMember2022-12-310001512931Born To Run, LLC, Equity Securities, Class A units2022-12-310001512931Lifted Trucks Holdings, LLC, Equity Securities, Class A units2022-12-310001512931us-gaap:AutomotiveSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931MV Receivables II, LLC, Equity Securities, Common units2022-12-310001512931MV Receivables II, LLC, Equity Securities, Warrant2022-12-310001512931mrcc:BankingSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931California Pizza Kitchen, Inc., Equity Securities, Common units2022-12-310001512931us-gaap:FoodAndBeverageSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931MCP Shaw Acquisitionco, LLC, Equity Securities, Class A-2 units2022-12-310001512931mrcc:CapitalEquipmentMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Valudor Products LLC, Equity Securities, Class A-1 units2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMemberus-gaap:ChemicalsSectorMember2022-12-310001512931Independence Buyer, Inc., Equity Securities, Class A units2022-12-310001512931mrcc:ConsumerGoodsDurableMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Quest Resource Management Group, LLC, Equity Securities, Warrant 12022-12-310001512931Quest Resource Management Group, LLC, Equity Securities, Warrant 22022-12-310001512931mrcc:EnvironmentalIndustriesMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931J2 BWA Funding LLC, , Equity Securities, Profit sharing2022-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 12022-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 22022-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 32022-12-310001512931PKS Holdings, LLC, Equity Securities, Preferred units 42022-12-310001512931mrcc:FireFinanceSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Witkoff/Monroe 700 JV LLC, Equity Securities, Preferred units2022-12-310001512931mrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Dorado Acquisition, Inc., , Equity Securities, Class A-1 units2022-12-310001512931Dorado Acquisition, Inc., , Equity Securities, Class A-2 units2022-12-310001512931NationsBenefits, LLC, Equity Securities, Series B units2022-12-310001512931NationsBenefits, LLC, Equity Securities, Common units2022-12-310001512931NQ PE Project Colosseum Midco Inc., Equity Securities, Common units2022-12-310001512931Seran BioScience, LLC, Equity Securities, Common units2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:HealthcareSectorMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Amelia Holding II, LLC, Equity Securities, Warrant2022-12-310001512931Drawbridge Partners, LLC, Equity Securities, Class A-1 units2022-12-310001512931MarkLogic Corporation, Equity Securities, Class A units2022-12-310001512931Planful, Inc., Equity Securities, Class A units2022-12-310001512931Recorded Future, Inc., Equity Securities, Class A units2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:HighTechIndustriesSectorMember2022-12-310001512931Equine Network, LLC, Equity Securities, Class A units2022-12-310001512931mrcc:HotelsGamingLeisureMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931AdTheorent Holding Company, Inc., Equity Securities, Common stock2022-12-310001512931InMobi Pte, Ltd., Equity Securities, Warrant2022-12-310001512931Relevate Health Group, LLC, Equity Securities, Preferred units2022-12-310001512931Relevate Health Group, LLC, Equity Securities, Class B common units2022-12-310001512931Spherix Global Inc., Equity Securities, Class A units2022-12-310001512931XanEdu Publishing, Inc., Equity Securities, Class A units2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:MediaAdvertisingPrintingPublishingMember2022-12-310001512931Attom Intermediate Holdco, LLC, Equity Securities, Class A units2022-12-310001512931Chess.com, LLC, Equity Securities, Class A units2022-12-310001512931mrcc:MediaDiversifiedProductionMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931BLST Operating Company, LLC, Equity Securities, Class A units2022-12-310001512931Forman Mills, Inc., Equity Securities, Warrant2022-12-310001512931Luxury Optical Holdings Co., Equity Securities2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMemberus-gaap:RetailSectorMember2022-12-310001512931APCO Worldwide, Inc, Equity Securities, Class A voting common stock2022-12-310001512931mrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Education Corporation of America, Equity Securities, Series G Preferred Stock2022-12-310001512931Express Wash Acquisition Company, LLC, Equity Securities, Class A units2022-12-310001512931IDIG Parent, LLC, Equity Securities, Common stock2022-12-310001512931Kar Wash Holdings, LLC, Equity Securities, Class A units2022-12-310001512931mrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931American Broadband and Telecommunications Company LLC, Equity Securities, Warrant2022-12-310001512931mrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Nearly Natural, Inc., Equity Securities Class A units2022-12-310001512931Nearly Natural, Inc., Equity Securities Class AA units2022-12-310001512931mrcc:WholesaleMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMember2022-12-310001512931TJ Management HoldCo LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:FoodAndBeverageSectorMember2022-12-310001512931American Community Homes, Inc., Senior Secured Loans 12022-12-310001512931American Community Homes, Inc., Senior Secured Loans 22022-12-310001512931American Community Homes, Inc. , Senior Secured Loans32022-12-310001512931American Community Homes, Inc., Senior Secured Loans 42022-12-310001512931American Community Homes, Inc., Senior Secured Loans 52022-12-310001512931American Community Homes, Inc., Senior Secured Loans 62022-12-310001512931American Community Homes, Inc., Senior Secured Loans 72022-12-310001512931American Community Homes, Inc., Senior Secured Loans, Revolver2022-12-310001512931HFZ Capital Group LLC, Senior Secured Loans 12022-12-310001512931HFZ Capital Group LLC, Senior Secured Loans) 22022-12-310001512931MC Asset Management (Corporate), LLC, Senior Secured Loans2022-12-310001512931MC Asset Management (Corporate), LLC, Senior Secured Loans, Delayed Draw2022-12-310001512931Second Avenue SFR Holdings II LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FireRealEstateSectorMember2022-12-310001512931Ascent Midco, LLC, Senior Secured Loans2022-12-310001512931Ascent Midco, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:HealthcareSectorMember2022-12-310001512931Mnine Holdings, Inc., Senior Secured Loans2022-12-310001512931Mnine Holdings, Inc., Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HighTechIndustriesSectorMember2022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC), Senior Secured Loans2022-12-310001512931us-gaap:SeniorLoansMembermrcc:BusinessServicesSectorMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-12-310001512931NECB Collections, LLC, Senior Secured Loans, Revolver2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-12-310001512931SFR Holdco, LLC, Junior Secured Loans2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FireRealEstateSectorMember2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-12-310001512931TJ Management HoldCo LLC, Equity Securities, Common stock2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:FoodAndBeverageSectorMemberus-gaap:EquitySecuritiesMember2022-12-310001512931American Community Homes, Inc, Equity Securities, Common stock2022-12-310001512931MC Asset Management (Corporate), LLC, Equity Securities2022-12-310001512931SFR Holdco, LLC, Equity Securities2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FireRealEstateSectorMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Ascent Midco, LLC, Equity Securities, Class A units2022-12-310001512931Familia Dental Group Holdings, LLC, Equity Securities, Class A units2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:HealthcareSectorMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Mnine Holdings, Inc., Equity Securities, Class B units2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:EquitySecuritiesMembermrcc:HighTechIndustriesSectorMember2022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC), Equity Securities, Common stock2022-12-310001512931mrcc:BusinessServicesSectorMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:EquitySecuritiesMember2022-12-310001512931NECB Collections, LLC, Equity Securities2022-12-310001512931mrcc:ServicesConsumerSectorMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMemberus-gaap:EquitySecuritiesMember2022-12-310001512931MRCC Senior Loan Fund I, LLC, Equity Securities2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMemberus-gaap:EquitySecuritiesMember2022-12-310001512931Foreign currency forward contract 12022-12-31iso4217:AUD0001512931Foreign currency forward contract 12022-01-012022-12-310001512931Foreign currency forward contract 22022-12-310001512931Foreign currency forward contract 22022-01-012022-12-310001512931Foreign currency forward contract 32022-12-310001512931Foreign currency forward contract 32022-01-012022-12-310001512931Foreign currency forward contract 42022-12-310001512931Foreign currency forward contract 42022-01-012022-12-310001512931Foreign currency forward contract 52022-12-310001512931Foreign currency forward contract 52022-01-012022-12-310001512931Foreign currency forward contract 62022-12-310001512931Foreign currency forward contract 62022-01-012022-12-310001512931Foreign currency forward contract 72022-12-310001512931Foreign currency forward contract 72022-01-012022-12-310001512931Foreign currency forward contract 82022-12-310001512931Foreign currency forward contract 82022-01-012022-12-310001512931Foreign currency forward contract 92022-12-310001512931Foreign currency forward contract 92022-01-012022-12-310001512931Foreign currency forward contract 102022-12-310001512931Foreign currency forward contract 102022-01-012022-12-310001512931Foreign currency forward contract 112022-12-310001512931Foreign currency forward contract 112022-01-012022-12-310001512931Foreign currency forward contract 122022-12-310001512931Foreign currency forward contract 122022-01-012022-12-310001512931Foreign currency forward contract 132022-12-310001512931Foreign currency forward contract 132022-01-012022-12-310001512931Foreign currency forward contract 142022-12-310001512931Foreign currency forward contract 142022-01-012022-12-310001512931Foreign currency forward contract 152022-12-310001512931Foreign currency forward contract 152022-01-012022-12-310001512931us-gaap:ForeignExchangeForwardMember2022-01-012022-12-310001512931mrcc:RecordedFutureIncMember2022-12-310001512931mrcc:IDIGParentLLCMember2022-12-310001512931mrcc:CurionHoldingsLLCMember2022-12-310001512931mrcc:FamiliaDentalGroupHoldingsLLCMember2022-12-3100015129312012-10-012012-10-31mrcc:investment0001512931us-gaap:SeniorLoansMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:SeniorLoansMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:UnitrancheDebtMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMemberus-gaap:UnitrancheDebtMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:UnitrancheDebtMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMemberus-gaap:UnitrancheDebtMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:JuniorLoansMember2023-12-310001512931us-gaap:JuniorLoansMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:JuniorLoansMember2022-12-310001512931us-gaap:JuniorLoansMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931mrcc:LlcEquityInterestMember2023-12-310001512931mrcc:LlcEquityInterestMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931mrcc:LlcEquityInterestMember2022-12-310001512931mrcc:LlcEquityInterestMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:EquitySecuritiesMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMemberus-gaap:EquitySecuritiesMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:EquitySecuritiesMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMemberus-gaap:EquitySecuritiesMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:SeniorLoansMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:SeniorLoansMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMemberus-gaap:UnitrancheDebtMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMemberus-gaap:UnitrancheDebtMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:JuniorLoansMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:JuniorLoansMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931mrcc:LlcEquityInterestMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931mrcc:LlcEquityInterestMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMemberus-gaap:EquitySecuritiesMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMemberus-gaap:EquitySecuritiesMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentTypeConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:NonUsMember2023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:NonUsMember2023-01-012023-12-310001512931us-gaap:NonUsMember2022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:NonUsMember2022-01-012022-12-310001512931us-gaap:MidwestRegionMember2023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:MidwestRegionMember2023-01-012023-12-310001512931us-gaap:MidwestRegionMember2022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:MidwestRegionMember2022-01-012022-12-310001512931us-gaap:NortheastRegionMember2023-12-310001512931us-gaap:NortheastRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMember2023-01-012023-12-310001512931us-gaap:NortheastRegionMember2022-12-310001512931us-gaap:NortheastRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMember2022-01-012022-12-310001512931us-gaap:SoutheastRegionMember2023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:SoutheastRegionMember2023-01-012023-12-310001512931us-gaap:SoutheastRegionMember2022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:SoutheastRegionMember2022-01-012022-12-310001512931us-gaap:SouthwestRegionMember2023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:SouthwestRegionMember2023-01-012023-12-310001512931us-gaap:SouthwestRegionMember2022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMemberus-gaap:SouthwestRegionMember2022-01-012022-12-310001512931us-gaap:WestRegionMember2023-12-310001512931us-gaap:WestRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMember2023-01-012023-12-310001512931us-gaap:WestRegionMember2022-12-310001512931us-gaap:WestRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMember2022-01-012022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMember2023-01-012023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtCostMember2022-01-012022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:NonUsMember2023-01-012023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:NonUsMember2022-01-012022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:MidwestRegionMember2023-01-012023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:MidwestRegionMember2022-01-012022-12-310001512931us-gaap:NortheastRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMember2023-01-012023-12-310001512931us-gaap:NortheastRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:SoutheastRegionMember2023-01-012023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:SoutheastRegionMember2022-01-012022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:SouthwestRegionMember2023-01-012023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMemberus-gaap:SouthwestRegionMember2022-01-012022-12-310001512931us-gaap:WestRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMember2023-01-012023-12-310001512931us-gaap:WestRegionMemberus-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMember2023-01-012023-12-310001512931us-gaap:GeographicConcentrationRiskMembermrcc:InvestmentOwnedAtFairValueMember2022-01-012022-12-310001512931us-gaap:AerospaceSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:AerospaceSectorMember2023-01-012023-12-310001512931us-gaap:AerospaceSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:AerospaceSectorMember2022-01-012022-12-310001512931us-gaap:AutomotiveSectorMember2023-12-310001512931us-gaap:AutomotiveSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:AutomotiveSectorMember2022-12-310001512931us-gaap:AutomotiveSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:BankingSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:BankingSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:BankingSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:BankingSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:FoodAndBeverageSectorMember2023-12-310001512931us-gaap:FoodAndBeverageSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:FoodAndBeverageSectorMember2022-12-310001512931us-gaap:FoodAndBeverageSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:CapitalEquipmentMember2023-12-310001512931mrcc:CapitalEquipmentMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:CapitalEquipmentMember2022-12-310001512931mrcc:CapitalEquipmentMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:ChemicalsSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:ChemicalsSectorMember2023-01-012023-12-310001512931us-gaap:ChemicalsSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:ChemicalsSectorMember2022-01-012022-12-310001512931us-gaap:ConstructionSectorMember2023-12-310001512931us-gaap:ConstructionSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:ConstructionSectorMember2022-12-310001512931us-gaap:ConstructionSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:ConsumerGoodsDurableMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsDurableMember2023-01-012023-12-310001512931mrcc:ConsumerGoodsDurableMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsDurableMember2022-01-012022-12-310001512931mrcc:ConsumerGoodsNonDurableSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsNonDurableSectorMember2023-01-012023-12-310001512931mrcc:ConsumerGoodsNonDurableSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsNonDurableSectorMember2022-01-012022-12-310001512931mrcc:EnvironmentalIndustriesMember2023-12-310001512931mrcc:EnvironmentalIndustriesMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:EnvironmentalIndustriesMember2022-12-310001512931mrcc:EnvironmentalIndustriesMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:FireFinanceSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:FireFinanceSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:FireFinanceSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:FireFinanceSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:FireRealEstateSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:FireRealEstateSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:FireRealEstateSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:FireRealEstateSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931us-gaap:HealthcareSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:HealthcareSectorMember2023-01-012023-12-310001512931us-gaap:HealthcareSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:HealthcareSectorMember2022-01-012022-12-310001512931mrcc:HighTechIndustriesSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:HighTechIndustriesSectorMember2023-01-012023-12-310001512931mrcc:HighTechIndustriesSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:HighTechIndustriesSectorMember2022-01-012022-12-310001512931mrcc:HotelsGamingLeisureMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:HotelsGamingLeisureMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:HotelsGamingLeisureMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:HotelsGamingLeisureMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentFundsVehiclesSectorMember2023-12-310001512931mrcc:InvestmentFundsVehiclesSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentFundsVehiclesSectorMember2022-12-310001512931mrcc:InvestmentFundsVehiclesSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:MediaAdvertisingPrintingPublishingMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaAdvertisingPrintingPublishingMember2023-01-012023-12-310001512931mrcc:MediaAdvertisingPrintingPublishingMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaAdvertisingPrintingPublishingMember2022-01-012022-12-310001512931mrcc:MediaBroadcastingSubscriptionMember2023-12-310001512931mrcc:MediaBroadcastingSubscriptionMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:MediaBroadcastingSubscriptionMember2022-12-310001512931mrcc:MediaBroadcastingSubscriptionMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:MediaDiversifiedProductionMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaDiversifiedProductionMember2023-01-012023-12-310001512931mrcc:MediaDiversifiedProductionMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaDiversifiedProductionMember2022-01-012022-12-310001512931us-gaap:RetailSectorMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:RetailSectorMember2023-01-012023-12-310001512931us-gaap:RetailSectorMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:RetailSectorMember2022-01-012022-12-310001512931mrcc:BusinessServicesSectorMember2023-12-310001512931mrcc:BusinessServicesSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:BusinessServicesSectorMember2022-12-310001512931mrcc:BusinessServicesSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:ServicesConsumerSectorMember2023-12-310001512931mrcc:ServicesConsumerSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:ServicesConsumerSectorMember2022-12-310001512931mrcc:ServicesConsumerSectorMembermrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:TelecommunicationsMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:TelecommunicationsMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:TelecommunicationsMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:TelecommunicationsMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:WholesaleMember2023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:WholesaleMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:WholesaleMember2022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:WholesaleMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtCostMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:AerospaceSectorMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:AerospaceSectorMember2022-01-012022-12-310001512931us-gaap:AutomotiveSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:AutomotiveSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:BankingSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:BankingSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMemberus-gaap:FoodAndBeverageSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMemberus-gaap:FoodAndBeverageSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:CapitalEquipmentMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:CapitalEquipmentMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:ChemicalsSectorMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:ChemicalsSectorMember2022-01-012022-12-310001512931us-gaap:ConstructionSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931us-gaap:ConstructionSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsDurableMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsDurableMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsNonDurableSectorMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:ConsumerGoodsNonDurableSectorMember2022-01-012022-12-310001512931mrcc:EnvironmentalIndustriesMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:EnvironmentalIndustriesMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:FireFinanceSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:FireFinanceSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:FireRealEstateSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:FireRealEstateSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:HealthcareSectorMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:HealthcareSectorMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:HighTechIndustriesSectorMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:HighTechIndustriesSectorMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:HotelsGamingLeisureMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:HotelsGamingLeisureMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentFundsVehiclesSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentFundsVehiclesSectorMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaAdvertisingPrintingPublishingMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaAdvertisingPrintingPublishingMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:MediaBroadcastingSubscriptionMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:MediaBroadcastingSubscriptionMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaDiversifiedProductionMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMembermrcc:MediaDiversifiedProductionMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:RetailSectorMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMemberus-gaap:RetailSectorMember2022-01-012022-12-310001512931mrcc:BusinessServicesSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:BusinessServicesSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:ServicesConsumerSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:ServicesConsumerSectorMembermrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:TelecommunicationsMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:TelecommunicationsMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:WholesaleMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:WholesaleMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2023-01-012023-12-310001512931mrcc:InvestmentOwnedAtFairValueMembermrcc:InvestmentPortfolioByIndustryConcentrationRiskMember2022-01-012022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2022-01-012022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2023-01-012023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:EquityInterestSubscriptionsMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:EquityInterestSubscriptionsMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2023-01-012023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2022-01-012022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2021-01-012021-12-310001512931mrcc:SeniorSecuredRevolvingCreditFacilityMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:SeniorSecuredRevolvingCreditFacilityMembermrcc:MRCCSeniorLoanFundILLCMember2023-06-090001512931mrcc:SeniorSecuredRevolvingCreditFacilityMembermrcc:MRCCSeniorLoanFundILLCMembermrcc:SecuredOvernightFinancingRateSOFRMember2023-01-012023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMembermrcc:AdministrationAgreementWithMonroeCapitalManagementAdvisorsLlcMember2023-01-012023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMembermrcc:AdministrationAgreementWithMonroeCapitalManagementAdvisorsLlcMember2022-01-012022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMembermrcc:AdministrationAgreementWithMonroeCapitalManagementAdvisorsLlcMember2021-01-012021-12-310001512931us-gaap:SeniorLoansMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-31mrcc:company0001512931Largest Portfolio Company Investmentmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Largest Portfolio Company Investmentmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Top Five Largest Portfolio Company Investmentsmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Top Five Largest Portfolio Company Investmentsmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Trident Maritime Systems, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Trident Maritime Systems, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Trident Maritime Systems, Inc. 3mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Trident Maritime Systems, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMemberus-gaap:AerospaceSectorMember2023-12-310001512931Accelerate Auto Works Intermediate, LLC 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberAccelerate Auto Works Intermediate, LLC 22023-12-310001512931Accelerate Auto Works Intermediate, LLC (Revolver) mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Truck-Lite Co., LLC 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Truck-Lite Co., LLC 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Truck-Lite Co., LLC 3mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:AutomotiveSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931SW Ingredients Holdings, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FoodAndBeverageSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931DS Parent, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberMacQueen Equipment, LLC2023-12-310001512931MacQueen Equipment, LLC, Delayed Drawmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931MacQueen Equipment, LLC, Revolvermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:CapitalEquipmentMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Phoenix Chemical Holding Company LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931TJC Spartech Acquisition Corp.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMemberus-gaap:ChemicalsSectorMember2023-12-310001512931Elevate Textiles, Inc. (fka International Textile Group, Inc.)mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Runner Buyer INC.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ConsumerGoodsDurableMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberPH Beauty Holdings III, INC.2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:ConsumerSectorNon-DurableMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Polychem Acquisition, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931PVHC Holding Corpmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMemberus-gaap:ContainerAndPackagingSectorMember2023-12-310001512931Offen, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Offen, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:EnergySectorOilAndGasMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Harbour Benefit Holdings, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Harbour Benefit Holdings, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Minotaur Acquisition, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931TEAM Public Choices, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:FireFinanceSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Avison Young (USA) Inc. mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Cano Health, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931HAH Group Holding Company LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931LSCS Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Natus Medical Incorporatedmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Paragon Healthcare, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Paragon Healthcare, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Paragon Healthcare, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Radiology Partners, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:HealthcareSectorMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Corel Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Lightbox Intermediate, L.P.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931TGG TS Acquisition Companymrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMembermrcc:HighTechIndustriesSectorMember2023-12-310001512931Excel Fitness Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Excel Fitness Holdings, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931North Haven Spartan US Holdco, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Tait LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Tait LLC, Revolvermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:HotelsGamingLeisureMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Research Now Group, Inc. and Survey Sampling International, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931STATS Intermediate Holdings, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931TA TT Buyer, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MediaDiversifiedProductionMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931CHA Holdings, Inc 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931CHA Holdings, Inc 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Eliassen Group, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Eliassen Group, LLC, Delayed Drawmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Engage2Excel, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Engage2Excel, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Engage2Excel, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Output Services Group, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Secretariat Advisors LLC 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Secretariat Advisors LLC 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931SIRVA Worldwide Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Teneo Holdings LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931360Holdco, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931360Holdco, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Laseraway Intermediate Holdings II, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931McKissock Investment Holdings, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Intermedia Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Mavenir Systems, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Sandvine Corporationmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Keystone Purchaser, LLCmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:TransportationSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Dresser Utility Solutions, LLC 1mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Dresser Utility Solutions, LLC 2mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:UtilitiesOilGasSectorMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931HALO Buyer, Inc.mrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:WholesaleMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Elevate Textiles, Inc. (fka International Textile Group, Inc.), Common unitsmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:ConsumerGoodsDurableMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Polyventive Lender Holding Company LLC, Equitymrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:MRCCSeniorLoanFundILLCMemberus-gaap:ChemicalsSectorMember2023-12-310001512931Output Services Group, Inc., Class A unitsmrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931mrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931us-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:EquitySecuritiesMembermrcc:MRCCSeniorLoanFundILLCMember2023-12-310001512931Bromford Industries Limited 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Bromford Industries Limited 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Trident Maritime Systems, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Trident Maritime Systems, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Trident Maritime Systems, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMemberus-gaap:AerospaceSectorMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberAccelerate Auto Works Intermediate, LLC2022-12-310001512931Accelerate Auto Works Intermediate, LLC. Delayed Drawmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Accelerate Auto Works Intermediate, LLC. Revolvermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Truck-Lite Co., LLC 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Truck-Lite Co., LLC 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Truck-Lite Co., LLC 3mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Wheel Pros, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:AutomotiveSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931CBC Restaurant Corp.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931SW Ingredients Holdings, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FoodAndBeverageSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberAnalogic Corporation2022-12-310001512931DS Parent, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberMacQueen Equipment, LLC2022-12-310001512931MacQueen Equipment, LLC, Delayed Drawmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931MacQueen Equipment, LLC, Revolvermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:CapitalEquipmentMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Phoenix Chemical Holding Company LLC (fka Polymer Solutions Group)mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931TJC Spartech Acquisition Corp.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMemberus-gaap:ChemicalsSectorMember2022-12-310001512931The Cook & Boardman Group LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:ConstructionSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931International Textile Group, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Runner Buyer INC.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ConsumerGoodsDurableMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberPH Beauty Holdings III, INC.2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:ConsumerSectorNon-DurableMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Liqui-Box Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Polychem Acquisition, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931PVHC Holding Corpmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMemberus-gaap:ContainerAndPackagingSectorMember2022-12-310001512931Drilling Info Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Offen, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Offen, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:EnergySectorOilAndGasMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Harbour Benefit Holdings, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Harbour Benefit Holdings, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Minotaur Acquisition, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931TEAM Public Choices, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:FireFinanceSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Avison Young (USA) Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:FireRealEstateSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Cano Health, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931HAH Group Holding Company LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931LSCS Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Natus Medical Incorporatedmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberParagon Healthcare, Inc.2022-12-310001512931Paragon Healthcare, Inc., Delayed Drawmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Paragon Healthcare, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Radiology Partners, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMemberus-gaap:HealthcareSectorMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Corel Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Lightbox Intermediate, L.P.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931TGG TS Acquisition Companymrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMembermrcc:HighTechIndustriesSectorMember2022-12-310001512931Excel Fitness Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Excel Fitness Holdings, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931North Haven Spartan US Holdco, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Tait LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Tait LLC, Revolvermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:HotelsGamingLeisureMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberCadent, LLC2022-12-310001512931Cadent, LLC (Revolver)mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MediaAdvertisingPrintingPublishingMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Research Now Group, Inc. and Survey Sampling International, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931STATS Intermediate Holdings, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931TA TT Buyer, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MediaDiversifiedProductionMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931AQ Carver Buyer, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931CHA Holdings, Inc 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931CHA Holdings, Inc 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Eliassen Group, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Eliassen Group, LLC, Delayed Drawmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Engage2Excel, Inc. 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Engage2Excel, Inc. 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Engage2Excel, Inc., Revolvermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Orbit Purchaser LLC 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberOrbit Purchaser LLC 22022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberOrbit Purchaser LLC 32022-12-310001512931Output Services Group, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Secretariat Advisors LLC 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Secretariat Advisors LLC 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931SIRVA Worldwide Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Teneo Holdings LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931The Kleinfelder Group, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:BusinessServicesSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember360Holdco, Inc.2022-12-310001512931360Holdco, Inc., Delayed Drawmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Laseraway Intermediate Holdings II, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931McKissock Investment Holdings, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ServicesConsumerSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Intermedia Holdings, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Mavenir Systems, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Sandvine Corporationmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:TelecommunicationsMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Keystone Purchaser, LLCmrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:TransportationSectorMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Dresser Utility Solutions, LLC (fka NGS US Finco, LLC) 1mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931Dresser Utility Solutions, LLC (fka NGS US Finco, LLC) 2mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:UtilitiesOilGasSectorMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931HALO Buyer, Inc.mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:WholesaleMemberus-gaap:InvestmentUnaffiliatedIssuerMembermrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:UnitrancheDebtMember2023-12-310001512931us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:UnitrancheDebtMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:UnitrancheDebtMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001512931us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:UnitrancheDebtMember2022-12-310001512931us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:UnitrancheDebtMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:UnitrancheDebtMember2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310001512931us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForwardContractsMemberus-gaap:FairValueInputsLevel1Member2022-12-310001512931us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForwardContractsMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForwardContractsMemberus-gaap:FairValueInputsLevel3Member2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForwardContractsMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMember2023-12-310001512931us-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2022-12-310001512931us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMember2022-12-310001512931us-gaap:SeniorLoansMember2022-12-310001512931us-gaap:UnitrancheDebtMember2022-12-310001512931us-gaap:JuniorLoansMember2022-12-310001512931us-gaap:EquitySecuritiesMember2022-12-310001512931mrcc:DebtAndEquitySecuritiesRealizedGainLossMember2023-01-012023-12-310001512931us-gaap:SeniorLoansMembermrcc:DebtAndEquitySecuritiesRealizedGainLossMember2023-01-012023-12-310001512931mrcc:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:UnitrancheDebtMember2023-01-012023-12-310001512931us-gaap:JuniorLoansMembermrcc:DebtAndEquitySecuritiesRealizedGainLossMember2023-01-012023-12-310001512931mrcc:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:EquitySecuritiesMember2023-01-012023-12-310001512931mrcc:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-01-012023-12-310001512931us-gaap:SeniorLoansMembermrcc:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-01-012023-12-310001512931mrcc:DebtAndEquitySecuritiesUnrealizedGainLossMemberus-gaap:UnitrancheDebtMember2023-01-012023-12-310001512931us-gaap:JuniorLoansMembermrcc:DebtAndEquitySecuritiesUnrealizedGainLossMember2023-01-012023-12-310001512931mrcc:DebtAndEquitySecuritiesUnrealizedGainLossMemberus-gaap:EquitySecuritiesMember2023-01-012023-12-310001512931us-gaap:SeniorLoansMember2023-01-012023-12-310001512931us-gaap:UnitrancheDebtMember2023-01-012023-12-310001512931us-gaap:JuniorLoansMember2023-01-012023-12-310001512931us-gaap:EquitySecuritiesMember2023-01-012023-12-310001512931us-gaap:SeniorLoansMember2023-12-310001512931us-gaap:UnitrancheDebtMember2023-12-310001512931us-gaap:JuniorLoansMember2023-12-310001512931us-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:SeniorLoansMember2021-12-310001512931us-gaap:UnitrancheDebtMember2021-12-310001512931us-gaap:JuniorLoansMember2021-12-310001512931us-gaap:EquitySecuritiesMember2021-12-310001512931mrcc:DebtAndEquitySecuritiesRealizedGainLossMember2022-01-012022-12-310001512931us-gaap:SeniorLoansMembermrcc:DebtAndEquitySecuritiesRealizedGainLossMember2022-01-012022-12-310001512931mrcc:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:UnitrancheDebtMember2022-01-012022-12-310001512931us-gaap:JuniorLoansMembermrcc:DebtAndEquitySecuritiesRealizedGainLossMember2022-01-012022-12-310001512931mrcc:DebtAndEquitySecuritiesRealizedGainLossMemberus-gaap:EquitySecuritiesMember2022-01-012022-12-310001512931mrcc:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-01-012022-12-310001512931us-gaap:SeniorLoansMembermrcc:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-01-012022-12-310001512931mrcc:DebtAndEquitySecuritiesUnrealizedGainLossMemberus-gaap:UnitrancheDebtMember2022-01-012022-12-310001512931us-gaap:JuniorLoansMembermrcc:DebtAndEquitySecuritiesUnrealizedGainLossMember2022-01-012022-12-310001512931mrcc:DebtAndEquitySecuritiesUnrealizedGainLossMemberus-gaap:EquitySecuritiesMember2022-01-012022-12-310001512931us-gaap:SeniorLoansMember2022-01-012022-12-310001512931us-gaap:UnitrancheDebtMember2022-01-012022-12-310001512931us-gaap:JuniorLoansMember2022-01-012022-12-310001512931us-gaap:EquitySecuritiesMember2022-01-012022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputProbabilityEBITDAMarketYieldsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMembersrt:MaximumMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueLiquidationMember2023-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMembermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMembermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:UnitrancheDebtMembermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931srt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMembermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931srt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2023-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2023-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueLiquidationMember2023-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:JuniorLoansMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMember2023-12-310001512931us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:EquitySecuritiesMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:EquitySecuritiesMember2023-12-310001512931srt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:EquitySecuritiesMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931mrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2023-12-310001512931mrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931mrcc:MeasurementInputProbabilityEBITDAMarketYieldsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2023-12-310001512931us-gaap:FairValueInputsLevel3Membermrcc:InvestmentsExcludingInvestmentsWhereValuationUnadjustedObtainedFromThirdPartyPricingServiceMember2023-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputProbabilityEBITDAMarketYieldsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMembersrt:MaximumMembermrcc:MeasurementInputBookValueMultiplesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueLiquidationMember2022-12-310001512931us-gaap:SeniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:SeniorLoansMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931mrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931mrcc:MeasurementInputProbabilityEBITDAMarketYieldsMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931mrcc:MeasurementInputProbabilityEBITDAMarketYieldsMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931srt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityRevenueMarketYieldsMemberus-gaap:UnitrancheDebtMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:JuniorLoansMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:JuniorLoansMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:MeasurementInputProbabilityMarketYieldsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2022-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueLiquidationMember2022-12-310001512931us-gaap:JuniorLoansMembermrcc:ProbabilityWeightingOfAlternativeOutcomesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueLiquidationMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMembermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Membermrcc:ValuationTechniqueEnterpriseValueMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMember2022-12-310001512931us-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:EquitySecuritiesMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:EquitySecuritiesMember2022-12-310001512931srt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputPriceVolatilityMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:EquitySecuritiesMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueInputsLevel3Membersrt:MinimumMemberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:MeasurementInputEbitdaMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2022-12-310001512931us-gaap:FairValueInputsLevel3Membermrcc:InvestmentsExcludingInvestmentsWhereValuationUnadjustedObtainedFromThirdPartyPricingServiceMember2022-12-310001512931American Community Homes, Inc., Senior Secured Loans 12023-01-012023-12-310001512931American Community Homes, Inc., Senior Secured Loans 22023-01-012023-12-310001512931American Community Homes, Inc., Senior Secured Loans 32022-12-310001512931American Community Homes, Inc., Senior Secured Loans 32023-01-012023-12-310001512931American Community Homes, Inc., Senior Secured Loans 42022-12-310001512931American Community Homes, Inc., Senior Secured Loans 42023-01-012023-12-310001512931American Community Homes, Inc., Senior Secured Loans 42023-12-310001512931American Community Homes, Inc., Senior Secured Loans 52023-01-012023-12-310001512931American Community Homes, Inc., Senior Secured Loans 62023-01-012023-12-310001512931American Community Homes, Inc., Senior Secured Loans 72023-01-012023-12-310001512931American Community Homes, Inc. (Revolver)2022-12-310001512931American Community Homes, Inc. (Revolver)2023-01-012023-12-310001512931American Community Homes, Inc. (Revolver)2023-12-310001512931American Community Homes, Inc. common stock2023-12-310001512931American Community Homes, Inc. common stock2022-12-310001512931American Community Homes, Inc. common stock2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:AmericanCommunityHomesInc.Member2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:AmericanCommunityHomesInc.Member2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:AmericanCommunityHomesInc.Member2023-12-310001512931Ascent Midco, L L C, Senior Secured Loans2022-12-310001512931Ascent Midco, L L C, Senior Secured Loans2023-01-012023-12-310001512931Ascent Midco, L L C, Senior Secured Loans2023-12-310001512931Ascent Midco, LLC (Revolver)2022-12-310001512931Ascent Midco, LLC (Revolver)2023-01-012023-12-310001512931Ascent Midco, LLC (Revolver)2023-12-310001512931Ascent Midco, L L C, Class A units2023-12-310001512931Ascent Midco, L L C, Class A units2022-12-310001512931Ascent Midco, L L C, Class A units2023-01-012023-12-310001512931mrcc:AscentMidcoLLCMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-12-310001512931mrcc:AscentMidcoLLCMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-01-012023-12-310001512931mrcc:AscentMidcoLLCMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2023-12-310001512931C Parent Holdings, LLC. 2022-12-310001512931C Parent Holdings, LLC. 2023-01-012023-12-310001512931C Parent Holdings, LLC. 2023-12-310001512931C Parent Holdings, LLC. Common stock2023-12-310001512931C Parent Holdings, LLC. Common stock2022-12-310001512931C Parent Holdings, LLC. Common stock2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:CParentHoldingsLLC.Member2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:CParentHoldingsLLC.Member2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:CParentHoldingsLLC.Member2023-12-310001512931Familia Dental Group Holdings, LLC, Class A units2023-12-310001512931Familia Dental Group Holdings, LLC, Class A units2022-12-310001512931Familia Dental Group Holdings, LLC, Class A units2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FamiliaDentalGroupHoldingsLLCMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FamiliaDentalGroupHoldingsLLCMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FamiliaDentalGroupHoldingsLLCMember2023-12-310001512931HFZ Capital Group LLC 12022-12-310001512931HFZ Capital Group LLC 12023-01-012023-12-310001512931HFZ Capital Group LLC 12023-12-310001512931HFZ Capital Group LLC 22022-12-310001512931HFZ Capital Group LLC 22023-01-012023-12-310001512931HFZ Capital Group LLC 22023-12-310001512931MC Asset Management (Corporate), LLC 12022-12-310001512931MC Asset Management (Corporate), LLC 12023-01-012023-12-310001512931MC Asset Management (Corporate), LLC 12023-12-310001512931MC Asset Management (Corporate), LLC 22022-12-310001512931MC Asset Management (Corporate), LLC 22023-01-012023-12-310001512931MC Asset Management (Corporate), LLC 22023-12-310001512931MC Asset Management (Corporate), LLC, Equity Interest2023-12-310001512931MC Asset Management (Corporate), LLC, Equity Interest2022-12-310001512931MC Asset Management (Corporate), LLC, Equity Interest2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HFZCapitalGroupLLCAndMCAssetManagementCorporateLLCMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HFZCapitalGroupLLCAndMCAssetManagementCorporateLLCMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HFZCapitalGroupLLCAndMCAssetManagementCorporateLLCMember2023-12-310001512931Mnine Holdings, Inc. 2022-12-310001512931Mnine Holdings, Inc. 2023-01-012023-12-310001512931Mnine Holdings, Inc. 2023-12-310001512931Mnine Holdings, Inc. 12022-12-310001512931Mnine Holdings, Inc. 12023-01-012023-12-310001512931Mnine Holdings, Inc. 12023-12-310001512931Mnine Holdings, Inc. 22022-12-310001512931Mnine Holdings, Inc. 22023-01-012023-12-310001512931Mnine Holdings, Inc. 22023-12-310001512931Mnine Holdings, Inc., Revolver2022-12-310001512931Mnine Holdings, Inc., Revolver2023-01-012023-12-310001512931Mnine Holdings, Inc., Revolver2023-12-310001512931Mnine Holdings, Inc., Class B units2023-12-310001512931Mnine Holdings, Inc., Class B units2022-12-310001512931Mnine Holdings, Inc., Class B units2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:MnineHoldingsIncMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:MnineHoldingsIncMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:MnineHoldingsIncMember2023-12-310001512931NECB Collections, LLC, Revolver2022-12-310001512931NECB Collections, LLC, Revolver2023-01-012023-12-310001512931NECB Collections, LLC, Revolver2023-12-310001512931NECB Collections, LLC, LLC, Units2023-12-310001512931NECB Collections, LLC, LLC, Units2022-12-310001512931NECB Collections, LLC, LLC, Units2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:NECBCollectionsLLCMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:NECBCollectionsLLCMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:NECBCollectionsLLCMember2023-12-310001512931Second Avenue SFR Holdings II LLC, Revolver2022-12-310001512931Second Avenue SFR Holdings II LLC, Revolver2023-01-012023-12-310001512931Second Avenue SFR Holdings II LLC, Revolver2023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SecondAvenueSFRHoldingsIILLCMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SecondAvenueSFRHoldingsIILLCMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SecondAvenueSFRHoldingsIILLCMember2023-12-310001512931SFR Holdco, LLC, Junior secured loan2022-12-310001512931SFR Holdco, LLC, Junior secured loan2023-01-012023-12-310001512931SFR Holdco, LLC, Junior secured loan2023-12-310001512931SFR Holdco, LLC, Equity interests2023-12-310001512931SFR Holdco, LLC, Equity interests2022-12-310001512931SFR Holdco, LLC, Equity interests2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SFRHoldcoLLCMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SFRHoldcoLLCMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SFRHoldcoLLCMember2023-12-310001512931TJ Management HoldCo LLC, Revolver2022-12-310001512931TJ Management HoldCo LLC, Revolver2023-01-012023-12-310001512931TJ Management HoldCo LLC, Revolver2023-12-310001512931TJ Management HoldCo LLC, Common stock2023-12-310001512931TJ Management HoldCo LLC, Common stock2022-12-310001512931TJ Management HoldCo LLC, Common stock2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:TJManagementHoldCoLLCMember2022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:TJManagementHoldCoLLCMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:TJManagementHoldCoLLCMember2023-12-310001512931M R C C Senior Loan Fund I, L L C, Equity Securities2022-12-310001512931M R C C Senior Loan Fund I, L L C, Equity Securities2023-01-012023-12-310001512931M R C C Senior Loan Fund I, L L C, Equity Securities2023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-01-012023-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2023-12-310001512931American Community Homes, Inc. 12021-12-310001512931American Community Homes, Inc. 12022-01-012022-12-310001512931American Community Homes, Inc. 12022-12-310001512931American Community Homes, Inc. 22021-12-310001512931American Community Homes, Inc. 22022-01-012022-12-310001512931American Community Homes, Inc. 22022-12-310001512931American Community Homes, Inc. 32021-12-310001512931American Community Homes, Inc. 32022-01-012022-12-310001512931American Community Homes, Inc. 32022-12-310001512931American Community Homes, Inc. 42021-12-310001512931American Community Homes, Inc. 42022-01-012022-12-310001512931American Community Homes, Inc. 42022-12-310001512931American Community Homes, Inc. 52021-12-310001512931American Community Homes, Inc. 52022-01-012022-12-310001512931American Community Homes, Inc. 52022-12-310001512931American Community Homes, Inc. 62021-12-310001512931American Community Homes, Inc. 62022-01-012022-12-310001512931American Community Homes, Inc. 62022-12-310001512931American Community Homes, Inc. 72021-12-310001512931American Community Homes, Inc. 72022-01-012022-12-310001512931American Community Homes, Inc. 72022-12-310001512931American Community Homes, Inc. (Revolver)2021-12-310001512931American Community Homes, Inc. (Revolver)2022-01-012022-12-310001512931American Community Homes, Inc. Common stock2022-12-310001512931American Community Homes, Inc. Common stock2021-12-310001512931American Community Homes, Inc. Common stock2022-01-012022-12-310001512931American Community Homes, Inc., Warrant2022-12-310001512931American Community Homes, Inc., Warrant2021-12-310001512931American Community Homes, Inc., Warrant2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:AmericanCommunityHomesInc.Member2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:AmericanCommunityHomesInc.Member2022-01-012022-12-310001512931Ascent Midco, LLC, Senior Secured Loans2021-12-310001512931Ascent Midco, LLC, Senior Secured Loans2022-01-012022-12-310001512931Ascent Midco, LLC (Revolver)2021-12-310001512931Ascent Midco, LLC (Revolver)2022-01-012022-12-310001512931Ascent Midco, LLC, Class A units2022-12-310001512931Ascent Midco, LLC, Class A units2021-12-310001512931Ascent Midco, LLC, Class A units2022-01-012022-12-310001512931mrcc:AscentMidcoLLCMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2021-12-310001512931mrcc:AscentMidcoLLCMemberus-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2022-01-012022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC)2021-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC)2022-01-012022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC)2022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Revolver)2021-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Revolver)2022-01-012022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Revolver)2022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Junior secured loan) 12021-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Junior secured loan) 12022-01-012022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Junior secured loan) 12022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Junior secured loan) 22021-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Junior secured loan) 22022-01-012022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) (Junior secured loan) 22022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) Common stock2022-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) Common stock2021-12-310001512931C Parent Holdings, LLC. (fka Curion Holdings, LLC) Common stock2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:CParentHoldingsLLC.Member2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:CParentHoldingsLLC.Member2022-01-012022-12-310001512931Familia Dental Group Holdings, LLC, Class A units2021-12-310001512931Familia Dental Group Holdings, LLC, Class A units2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FamiliaDentalGroupHoldingsLLCMember2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:FamiliaDentalGroupHoldingsLLCMember2022-01-012022-12-310001512931HFZ Capital Group, LLC 12021-12-310001512931HFZ Capital Group, LLC 12022-01-012022-12-310001512931HFZ Capital Group, LLC 12022-12-310001512931HFZ Capital Group, LLC 22021-12-310001512931HFZ Capital Group, LLC 22022-01-012022-12-310001512931HFZ Capital Group, LLC 22022-12-310001512931MC Asset Management (Corporate), LLC2021-12-310001512931MC Asset Management (Corporate), LLC2022-01-012022-12-310001512931MC Asset Management (Corporate), LLC2022-12-310001512931MC Asset Management (Corporate), LLC, Delayed Draw2021-12-310001512931MC Asset Management (Corporate), LLC, Delayed Draw2022-01-012022-12-310001512931MC Asset Management (Corporate), LLC, Delayed Draw2022-12-310001512931MC Asset Management (Corporate), LLC, Equity interest2022-12-310001512931MC Asset Management (Corporate), LLC, Equity interest2021-12-310001512931MC Asset Management (Corporate), LLC, Equity interest2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HFZCapitalGroupLLCAndMCAssetManagementCorporateLLCMember2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HFZCapitalGroupLLCAndMCAssetManagementCorporateLLCMember2022-01-012022-12-310001512931Mnine Holdings, Inc. Senior Secured Loans2021-12-310001512931Mnine Holdings, Inc. Senior Secured Loans2022-01-012022-12-310001512931Mnine Holdings, Inc. Senior Secured Loans2022-12-310001512931Mnine Holdings, Inc., Revolver2021-12-310001512931Mnine Holdings, Inc., Revolver2022-01-012022-12-310001512931Mnine Holdings, Inc., Class B units2021-12-310001512931Mnine Holdings, Inc., Class B units2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:MnineHoldingsIncMember2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:MnineHoldingsIncMember2022-01-012022-12-310001512931NECB Collections, LLC, Revolver2021-12-310001512931NECB Collections, LLC, Revolver2022-01-012022-12-310001512931NECB Collections, LLC, LLC, Units2021-12-310001512931NECB Collections, LLC, LLC, Units2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:NECBCollectionsLLCMember2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:NECBCollectionsLLCMember2022-01-012022-12-310001512931Second Avenue SFR Holdings II LLC, Revolver2021-12-310001512931Second Avenue SFR Holdings II LLC, Revolver2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SecondAvenueSFRHoldingsIILLCMember2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SecondAvenueSFRHoldingsIILLCMember2022-01-012022-12-310001512931SFR Holdings, LLC, Junior secured loan2021-12-310001512931SFR Holdings, LLC, Junior secured loan2022-01-012022-12-310001512931SFR Holdings, LLC, Junior secured loan2022-12-310001512931SFR Holding, LLC, Equity interests2022-12-310001512931SFR Holding, LLC, Equity interests2021-12-310001512931SFR Holding, LLC, Equity interests2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SFRHoldcoLLCMember2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:SFRHoldcoLLCMember2022-01-012022-12-310001512931TJ Management HoldCo, LLC (Revolver)2021-12-310001512931TJ Management HoldCo, LLC (Revolver)2022-01-012022-12-310001512931TJ Management HoldCo, LLC (Revolver)2022-12-310001512931TJ Management HoldCo, LLC, Common stock2022-12-310001512931TJ Management HoldCo, LLC, Common stock2021-12-310001512931TJ Management HoldCo, LLC, Common stock2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:TJManagementHoldCoLLCMember2021-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:TJManagementHoldCoLLCMember2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMember2021-12-310001512931MRCC Senior Loan Fund I, LLC2021-12-310001512931MRCC Senior Loan Fund I, LLC2022-01-012022-12-310001512931MRCC Senior Loan Fund I, LLC2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2021-12-310001512931mrcc:MRCCSeniorLoanFundILLCMemberus-gaap:InvestmentAffiliatedIssuerControlledMember2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerControlledMember2021-12-310001512931mrcc:AmericanCommunityHomesInc.Member2022-12-290001512931American Community Homes, Inc. 12023-01-012023-12-310001512931American Community Homes, Inc. 22023-01-012023-12-310001512931American Community Homes, Inc. 32023-01-012023-12-310001512931American Community Homes, Inc. 42023-01-012023-12-310001512931American Community Homes, Inc. 52023-01-012023-12-310001512931American Community Homes, Inc. 62023-01-012023-12-310001512931American Community Homes, Inc. 72023-01-012023-12-310001512931American Community Homes, Inc., Revolver2023-01-012023-12-310001512931American Community Homes, Inc., Revolver2022-01-012022-12-310001512931American Community Homes, Inc., Common stock2023-01-012023-12-310001512931American Community Homes, Inc., Common stock2022-01-012022-12-310001512931Ascent Midco, LLC2023-01-012023-12-310001512931Ascent Midco, LLC2022-01-012022-12-310001512931Ascent Midco, LLC, Revolver2023-01-012023-12-310001512931Ascent Midco, LLC, Revolver2022-01-012022-12-310001512931Ascent Midco, LLC, Class A units2023-01-012023-12-310001512931C Parent Holdings, LLC.2023-01-012023-12-310001512931C Parent Holdings, LLC.2022-01-012022-12-310001512931C Parent Holdings, LLC., Revolver2023-01-012023-12-310001512931C Parent Holdings, LLC., Revolver2022-01-012022-12-310001512931C Parent Holdings, LLC., Common stock2023-01-012023-12-310001512931C Parent Holdings, LLC., Common stock2022-01-012022-12-310001512931HFZ Capital Group, LLC 12023-01-012023-12-310001512931HFZ Capital Group, LLC 22023-01-012023-12-310001512931MC Asset Management (Corporate), LLC2023-01-012023-12-310001512931MC Asset Management (Corporate), LLC, Delayed Draw2023-01-012023-12-310001512931MC Asset Management (Corporate), LLC, LLC interest2023-01-012023-12-310001512931MC Asset Management (Corporate), LLC, LLC interest2022-01-012022-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HFZCapitalGroupLLCMCAssetManagementCorporateLLCMember2023-01-012023-12-310001512931us-gaap:InvestmentAffiliatedIssuerNoncontrolledMembermrcc:HFZCapitalGroupLLCMCAssetManagementCorporateLLCMember2022-01-012022-12-310001512931Mnine Holdings, Inc. 12022-01-012022-12-310001512931Mnine Holdings, Inc. 22022-01-012022-12-310001512931NECB Collections, LLC, LLC units2023-01-012023-12-310001512931NECB Collections, LLC, LLC units2022-01-012022-12-310001512931SFR Holdco, LLC, Junior secured loan2022-01-012022-12-310001512931SFR Holdco, LLC, LLC interest2023-01-012023-12-310001512931SFR Holdco, LLC, LLC interest2022-01-012022-12-310001512931TJ Management HoldCo, LLC, Revolver2023-01-012023-12-310001512931TJ Management HoldCo, LLC, Revolver2022-01-012022-12-310001512931TJ Management HoldCo, LLC, Common stock2023-01-012023-12-310001512931MRCC Senior Loan Fund I, LLC2023-01-012023-12-310001512931mrcc:MonroeCapitalBdcAdvisorsLlcMemberus-gaap:RelatedPartyMember2023-01-012023-12-31mrcc:component0001512931mrcc:MonroeCapitalBdcAdvisorsLlcMemberus-gaap:RelatedPartyMember2023-12-310001512931mrcc:MonroeCapitalBdcAdvisorsLlcMemberus-gaap:RelatedPartyMember2022-01-012022-12-310001512931mrcc:MonroeCapitalBdcAdvisorsLlcMemberus-gaap:RelatedPartyMember2021-01-012021-12-31utr:Q0001512931mrcc:MonroeCapitalManagementAdvisorsLlcMemberus-gaap:RelatedPartyMember2022-12-310001512931mrcc:MonroeCapitalManagementAdvisorsLlcMemberus-gaap:RelatedPartyMember2023-12-310001512931us-gaap:RelatedPartyMember2022-12-310001512931us-gaap:RelatedPartyMember2023-12-310001512931us-gaap:RevolvingCreditFacilityMember2022-12-270001512931us-gaap:RevolvingCreditFacilityMember2023-01-012023-12-310001512931us-gaap:RevolvingCreditFacilityMembersrt:MinimumMember2023-12-310001512931us-gaap:RevolvingCreditFacilityMembercurrency:USD2023-12-310001512931us-gaap:RevolvingCreditFacilityMembercurrency:USD2022-12-310001512931us-gaap:RevolvingCreditFacilityMember2021-01-012021-12-31iso4217:GBP0001512931us-gaap:RevolvingCreditFacilityMembermrcc:SecuredOvernightFinancingRateSOFRMember2023-01-012023-12-310001512931us-gaap:RevolvingCreditFacilityMemberus-gaap:PrimeRateMember2023-01-012023-12-310001512931us-gaap:RevolvingCreditFacilityMemberus-gaap:FederalFundsEffectiveSwapRateMember2023-01-012023-12-310001512931us-gaap:RevolvingCreditFacilityMembermrcc:SecuredOvernightFinancingRateSOFRMember2023-12-310001512931mrcc:AvailableMaximumBorrowingCapacityPercentageEqualToOrGreaterThan35PercentMemberus-gaap:RevolvingCreditFacilityMember2023-01-012023-12-310001512931mrcc:AvailableMaximumBorrowingCapacityPercentageEqualToOrGreaterThan35PercentMemberus-gaap:RevolvingCreditFacilityMember2023-12-310001512931us-gaap:RevolvingCreditFacilityMembermrcc:AvailableMaximumBorrowingCapacityPercentageLessThan35PercentMember2023-01-012023-12-310001512931us-gaap:RevolvingCreditFacilityMembermrcc:AvailableMaximumBorrowingCapacityPercentageLessThan35PercentMember2023-12-310001512931mrcc:A2023NotesMember2021-02-182021-02-180001512931mrcc:MRCCSBICMembermrcc:SBADebenturesMember2022-03-012022-03-010001512931mrcc:A2023NotesMember2022-01-012022-12-310001512931mrcc:A2023NotesMember2021-01-012021-12-310001512931mrcc:A2026NotesMember2022-01-012022-12-310001512931mrcc:A2026NotesMember2021-01-012021-12-310001512931mrcc:SBADebenturesMember2022-01-012022-12-310001512931mrcc:SBADebenturesMember2021-01-012021-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate1182023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate1182023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate2162023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate2162023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate3162023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate3162023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate4202023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate4202023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate5162023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate5162023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate6192023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate6192023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate7182023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate7182023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate8162023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate8162023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate9182023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate9182023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate10182023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate10182023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate11162023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate11162023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate12182023Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate12182023Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate1172024Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate1172024Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate2162024Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate2162024Member2022-01-012022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate3182024Member2022-12-310001512931mrcc:ForeignCurrencyForwardContractWithSettlementDate3182024Member2022-01-012022-12-3100015129312023-03-012023-03-0100015129312023-06-022023-06-0200015129312023-09-012023-09-0100015129312023-12-012023-12-0100015129312022-03-022022-03-0200015129312022-06-012022-06-0100015129312022-09-012022-09-0100015129312022-09-052022-09-0500015129312021-03-022021-03-0200015129312021-01-012021-03-3100015129312021-06-022021-06-0200015129312021-04-012021-06-3000015129312021-09-022021-09-0200015129312021-07-012021-09-3000015129312021-12-022021-12-0200015129312021-10-012021-12-310001512931mrcc:AtMarketMember2017-05-120001512931mrcc:AtMarketMember2023-01-012023-12-310001512931mrcc:AtMarketMember2022-01-012022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2022-12-310001512931mrcc:MRCCSeniorLoanFundILLCMember2023-12-3100015129312019-12-3100015129312018-12-3100015129312020-01-012020-12-3100015129312019-01-012019-12-3100015129312017-12-3100015129312016-12-3100015129312015-12-3100015129312014-12-3100015129312013-12-3100015129312018-01-012018-12-31