Organization	12 Months Ended
Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization In this report, the terms “Prospect”, “the Company”, “we”, “us” and “our” mean Prospect Capital Corporation and its subsidiaries unless the context specifically requires otherwise. Prospect is a financial services company that primarily lends to and invests in middle market privately-held companies. We are a closed-end investment company incorporated in Maryland. We have elected to be regulated as a business development company (“BDC”) under the Investment Company Act of 1940 (the “1940 Act”). As a BDC, we have elected to be treated as a regulated investment company (“RIC”), under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”). We were organized on April 13, 2004, and were funded in an initial public offering completed on July 27, 2004. On May 15, 2007, we formed a wholly owned subsidiary Prospect Capital Funding LLC (“PCF”), a Delaware limited liability company and a bankruptcy remote special purpose entity, which holds certain of our portfolio loan investments that are used as collateral for the revolving credit facility at PCF. On September 30, 2014, we formed a wholly-owned subsidiary Prospect Yield Corporation, LLC (“PYC”) and effective October 23, 2014, PYC holds a portion of our collateralized loan obligations (“CLOs”), which we also refer to as subordinated structured notes (“SSNs”). Each of these subsidiaries have been consolidated since operations commenced. We consolidate certain of our wholly owned and substantially wholly owned holding companies formed by us in order to facilitate our investment strategy. The following companies are included in our consolidated financial statements and are collectively referred to as the “Consolidated Holding Companies”: Belnick Holdings of Delaware, LLC (“Belnick Delaware”); CP Holdings of Delaware LLC (“CP Holdings”); Credit Central Holdings of Delaware, LLC; Energy Solutions Holdings Inc.; First Tower Holdings of Delaware LLC (“First Tower Delaware”); MITY Holdings of Delaware Inc.; Nationwide Acceptance Holdings LLC; NMMB Holdings, Inc. (“NMMB Holdings”); NPH Property Holdings, LLC (“NPH”); Prospect Opportunity Holdings I, Inc. (“POHI”); SB Forging Company, Inc. (“SB Forging”); STI Holding, Inc.; UTP Holdings Group Inc. (“UTP Holdings”); Valley Electric Holdings I, Inc. (“Valley Holdings I”); and Valley Electric Holdings II, Inc. (“Valley Holdings II”). We are externally managed by our investment adviser, Prospect Capital Management L.P. (“Prospect Capital Management” or the “Investment Adviser”). Prospect Administration LLC (“Prospect Administration” or the “Administrator”), a wholly-owned subsidiary of the Investment Adviser, provides administrative services and facilities necessary for us to operate. Our investment objective is to generate both current income and long-term capital appreciation. We intend to invest primarily in privately owned United States (“U.S.”) middle market companies, in senior and secured first lien loans and, to a lesser extent, second lien loans, as well as equity and equity-linked investments with capital-appreciation potential (such as senior and secured convertible debt, preferred equity, common equity and warrants). Most of our investments will be in private U.S. companies; however, we may also invest to some extent in broadly-traded public companies and non-U.S. companies (subject to compliance with BDC requirements to invest at least 70% of assets in “eligible portfolio companies,” which are generally privately offered securities issued by U.S. private or thinly-traded companies). We are a non-diversified company within the meaning of the 1940 Act.

In this report, the terms “Prospect”, “the Company”, “we”, “us” and “our” mean Prospect Capital Corporation and its subsidiaries unless the context specifically requires otherwise.

Prospect is a financial services company that primarily lends to and invests in middle market privately-held companies. We are a closed-end investment company incorporated in Maryland. We have elected to be regulated as a business development company (“BDC”) under the Investment Company Act of 1940 (the “1940 Act”). As a BDC, we have elected to be treated as a regulated investment company (“RIC”), under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”). We were organized on April 13, 2004, and were funded in an initial public offering completed on July 27, 2004.

On May 15, 2007, we formed a wholly owned subsidiary Prospect Capital Funding LLC (“PCF”), a Delaware limited liability company and a bankruptcy remote special purpose entity, which holds certain of our portfolio loan investments that are used as collateral for the revolving credit facility at PCF. On September 30, 2014, we formed a wholly-owned subsidiary Prospect Yield Corporation, LLC (“PYC”) and effective October 23, 2014, PYC holds a portion of our collateralized loan obligations (“CLOs”), which we also refer to as subordinated structured notes (“SSNs”). Each of these subsidiaries have been consolidated since operations commenced.

We consolidate certain of our wholly owned and substantially wholly owned holding companies formed by us in order to facilitate our investment strategy. The following companies are included in our consolidated financial statements and are collectively referred to as the “Consolidated Holding Companies”: Belnick Holdings of Delaware, LLC (“Belnick Delaware”); CP Holdings of Delaware LLC (“CP Holdings”); Credit Central Holdings of Delaware, LLC; Energy Solutions Holdings Inc.; First Tower Holdings of Delaware LLC (“First Tower Delaware”); MITY Holdings of Delaware Inc.; Nationwide Acceptance Holdings LLC; NMMB Holdings, Inc. (“NMMB Holdings”); NPH Property Holdings, LLC (“NPH”); Prospect Opportunity Holdings I, Inc. (“POHI”); SB Forging Company, Inc. (“SB Forging”); STI Holding, Inc.; UTP Holdings Group Inc. (“UTP Holdings”); Valley Electric Holdings I, Inc. (“Valley Holdings I”); and Valley Electric Holdings II, Inc. (“Valley Holdings II”).

We are externally managed by our investment adviser, Prospect Capital Management L.P. (“Prospect Capital Management” or the “Investment Adviser”). Prospect Administration LLC (“Prospect Administration” or the “Administrator”), a wholly-owned subsidiary of the Investment Adviser, provides administrative services and facilities necessary for us to operate.

Our investment objective is to generate both current income and long-term capital appreciation. We intend to invest primarily in privately owned United States (“U.S.”) middle market companies, in senior and secured first lien loans and, to a lesser extent, second lien loans, as well as equity and equity-linked investments with capital-appreciation potential (such as senior and secured convertible debt, preferred equity, common equity and warrants). Most of our investments will be in private U.S. companies; however, we may also invest to some extent in broadly-traded public companies and non-U.S. companies (subject to compliance with BDC requirements to invest at least 70% of assets in “eligible portfolio companies,” which are generally privately offered securities issued by U.S. private or thinly-traded companies). We are a non-diversified company within the meaning of the 1940 Act.