Organization	12 Months Ended
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. ORGANIZATION Portman Ridge Finance Corporation (“Portman Ridge” or the “Company”), formerly known as KCAP Financial, Inc., is an externally managed, non-diversified closed-end investment company that has elected to be regulated as a business development company (“BDC”) under the Investment Company Act of 1940, as amended (the “1940 Act”). The Company was formed as a Delaware limited liability company on August 8, 2006 and, prior to the issuance of shares of the Company’s common stock in its initial public offering (“IPO”), converted to a corporation incorporated in Delaware on December 11, 2006. The Company originates, structures, and invests in secured term loans, bonds or notes and mezzanine debt primarily in privately-held middle market companies but may also invest in other investments such as loans to publicly-traded companies, high-yield bonds, and distressed debt securities (collectively the “Debt Securities Portfolio”). The Company also invests in debt and subordinated securities issued by collateralized loan obligation funds (“CLO Fund Securities”). In addition, from time to time the Company may invest in the equity securities of privately held middle market companies and may also receive warrants or options to purchase common stock in connection with its debt investments. The Company has elected to be treated and intends to continue to qualify as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”). To qualify as a RIC, the Company must, among other things, meet certain source-of-income, asset diversification and annual distribution requirements. As a RIC, the Company generally will not have to pay corporate-level U.S. federal income taxes on any income that it distributes in a timely manner to its stockholders. On March 29, 2018, the Company’s Board of Directors (the “Board”), including a “required majority” (as such term is defined in Section 57(o) of the 1940 Act) of the Board, approved the modified asset coverage requirements set forth in Section 61(a)(2) of the 1940 Act, as amended by the Small Business Credit Availability Act (“SBCA”). As a result, the Company’s asset coverage requirement for senior securities changed from 200% to 150%, effective as of March 29, 2019. During the third quarter of 2017, the Company formed a joint venture with Freedom 3 Opportunities LLC (“Freedom 3 Opportunities”), an affiliate of Freedom 3 Capital LLC, to create KCAP Freedom 3 LLC (the “F3C Joint Venture”). The F3C Joint Venture may originate loans from time to time and sell them to the fund capitalized by the F3C Joint Venture. On November 8, 2018, the Company entered into an agreement with LibreMax Intermediate Holdings, LP (“LibreMax”) under which Commodore Holdings, LLC (“Commodore”), a wholly-owned subsidiary of the Company, sold the Company’s wholly-owned asset manager subsidiaries Katonah Debt Advisors, LLC (“Katonah Debt Advisors”), Trimaran Advisors, L.L.C. (“Trimaran Advisors”), and Trimaran Advisors Management, L.L.C. (“Trimaran Advisors Management” and, together with Katonah Debt Advisors and Trimaran Advisors, the “Disposed Manager Affiliates”), for a cash purchase price of approximately $37.9 million (the “LibreMax Transaction”). The LibreMax Transaction closed on December 31, 2018. As of December 31, 2024, the Company’s remaining wholly-owned asset management subsidiaries (the “Asset Manager Affiliates”) were comprised of Katonah Management Holdings, LLC and KCAP Management, LLC. Prior to their sale in the LibreMax Transaction, the Disposed Manager Affiliates represented substantially all of the Company’s investment in the Asset Manager Affiliates. The Externalization Agreement On December 14, 2018, the Company entered into a stock purchase and transaction agreement (the “Externalization Agreement”) with BC Partners Advisors L.P. (“BCP”), an affiliate of BC Partners LLP, (“BC Partners”), through which Sierra Crest Investment Management LLC (the “Adviser”), an affiliate of BC Partners, became the Company’s investment adviser pursuant to an investment advisory Agreement (the “Advisory Agreement”) with the Company. At a special meeting of the Company’s stockholders (the “Special Meeting”) held on February 19, 2019, the Company’s stockholders approved the Advisory Agreement. The transactions contemplated by the Externalization Agreement closed on April 1, 2019 (the “Closing”), and the Company commenced operations as an externally managed BDC managed by the Adviser on that date. On the date of the Closing, the Company changed its name from KCAP Financial, Inc. to Portman Ridge Finance Corporation and on April 2, 2019, began trading on the NASDAQ Global Select Market under the symbol “PTMN.” About the Adviser The Adviser is an affiliate of BC Partners. Subject to the overall supervision of the Board, the Adviser is responsible for managing the Company’s business and activities, including sourcing investment opportunities, conducting research, performing diligence on potential investments, structuring the Company’s investments, and monitoring the Company’s portfolio companies on an ongoing basis through a team of investment professionals. The Adviser seeks to invest on behalf of the Company in performing, well-established middle market businesses that operate across a wide range of industries (i.e., no concentration in any one industry). The Adviser employs fundamental credit analysis, targeting investments in businesses with relatively low levels of cyclicality and operating risk. The holding size of each position will generally be dependent upon a number of factors including total facility size, pricing and structure, and the number of other lenders in the facility. The Adviser has experience managing levered vehicles, both public and private, and seeks to enhance the Company’s returns through the use of leverage with a prudent approach that prioritizes capital preservation. The Adviser believes this strategy and approach offers attractive risk/return with lower volatility given the potential for fewer defaults and greater resilience through market cycles. During the fourth quarter of 2020, LibreMax Intermediate Holdings, LP (“LibreMax”) sold its minority stake in the Adviser to a wholly-owned subsidiary of Mount Logan Capital Inc. (“Mount Logan”). An affiliate of BC Partners serves as administrator to Mount Logan. OHAI Transaction On December 18, 2019, we completed our acquisition of OHA Investment Corporation (“OHAI”). In accordance with the terms of the merger agreement, each share of common stock, par value $0.001 per share, of OHAI (the “OHAI Common Stock”) issued and outstanding was converted into the right to receive (i) an amount in cash, without interest, equal to approximately $0.42, and (ii) 0.3688 shares of common stock, par value $0.01 per share, of the Company (plus any applicable cash in lieu of fractional shares). Each share of OHAI Common Stock issued and outstanding received, as additional consideration funded by the Adviser, an amount in cash, without interest, equal to approximately $0.15. GARS Transaction On October 28, 2020, we completed our acquisition of Garrison Capital Inc., a publicly traded BDC (“GARS”, and such transaction the “GARS Acquisition”). To effect the acquisition, our wholly owned merger subsidiary merged with and into GARS, with GARS surviving the merger as our wholly owned subsidiary. Immediately thereafter and as a single integrated transaction, GARS consummated a second merger, whereby GARS merged with and into us, with the Company surviving the merger. In accordance with the terms of the merger agreement for the GARS Acquisition, dated June 24, 2020 (the “GARS Merger Agreement”), each share of common stock, par value $0.001 per share, of GARS (the “GARS Common Stock”) issued and outstanding was converted into the right to receive (i) an amount in cash, without interest, equal to approximately $1.19 and (ii) approximately 1.917 shares of common stock, par value $0.01 per share, of the Company (plus any applicable cash in lieu of fractional shares). Each share of GARS Common Stock issued and outstanding received, as additional consideration funded by the Adviser, an amount in cash, without interest, equal to approximately $0.31. HCAP Transaction On June 9, 2021, we completed our acquisition of Harvest Capital Credit Corporation, a publicly traded BDC (“HCAP”, and such transaction the “HCAP Acquisition”). To effect the acquisition, our wholly owned merger subsidiary (“Acquisition Sub”) merged with and into HCAP, with HCAP surviving the merger as the Company’s wholly owned subsidiary. Immediately thereafter and as a single integrated transaction, HCAP consummated a second merger, whereby HCAP merged with and into the Company, with the Company surviving the merger. As a result of, and as of the effective time of, the second merger, HCAP’s separate corporate existence ceased. Under the terms of the merger agreement for the HCAP Acquisition, dated December 23, 2020 (the “HCAP Merger Agreement”), HCAP stockholders as of immediately prior to the effective time of the first merger (other than shares held by a subsidiary of HCAP or held, directly or indirectly, by the Company or Acquisition Sub, and all treasury shares (collectively, “Cancelled Shares”)) received a combination of (i) $18.54 million in cash paid by the Company, (ii) 15,252,453 validly issued, fully paid and non-assessable shares of the Company’s common stock, par value $0.01 per share, and (iii) an additional cash payment from the Adviser of $2.15 million in the aggregate. Reverse Stock Split On August 23, 2021, the Company filed a Certificate of Amendment (the “Reverse Stock Split Certificate of Amendment”) to the Company’s Certificate of Incorporation with the Secretary of State of the State of Delaware to effect a 1-for-10 reverse stock split of the issued and outstanding (or held in treasury) shares of the Company’s common stock, par value $0.01 per share (the “Reverse Stock Split”). The Reverse Stock Split became effective as of 12:01 a.m. (Eastern Time) on August 26, 2021. As a result of the Reverse Stock Split, every ten shares of issued and outstanding common stock were automatically combined into one issued and outstanding share of common stock, without any change in the par value per share. No fractional shares were issued as a result of the Reverse Stock Split. Instead, any stockholder who would have been entitled to receive a fractional share as a result of the Reverse Stock Split received cash payments in lieu of such fractional shares (without interest and subject to backup withholding and applicable withholding taxes). On August 23, 2021, the Company filed a Certificate of Amendment to decrease the number of authorized shares of common stock by one half of the reverse stock split ratio (the “Decrease Shares Certificate of Amendment”) with the Secretary of State of the State of Delaware. The Decrease Shares Certificate of Amendment became effective as of 12:05 a.m. (Eastern Time) on August 26, 2021. Following the effectiveness of the Decrease Shares Certificate of Amendment, the number of authorized shares of common stock under the Company’s Certificate of Incorporation was reduced from 100 million shares to 20 million shares. The Reverse Stock Split Certificate of Amendment and the Decrease Shares Certificate of Amendment were approved by the Company’s stockholders at its annual meeting held on June 7, 2021 and were approved by the Board on August 4, 2021.

Organization

12 Months Ended

Dec. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. ORGANIZATION

Portman Ridge Finance Corporation (“Portman Ridge” or the “Company”), formerly known as KCAP Financial, Inc., is an externally managed, non-diversified closed-end investment company that has elected to be regulated as a business development company (“BDC”) under the Investment Company Act of 1940, as amended (the “1940 Act”). The Company was formed as a Delaware limited liability company on August 8, 2006 and, prior to the issuance of shares of the Company’s common stock in its initial public offering (“IPO”), converted to a corporation incorporated in Delaware on December 11, 2006.

The Company originates, structures, and invests in secured term loans, bonds or notes and mezzanine debt primarily in privately-held middle market companies but may also invest in other investments such as loans to publicly-traded companies, high-yield bonds, and distressed debt securities (collectively the “Debt Securities Portfolio”). The Company also invests in debt and subordinated securities issued by collateralized loan obligation funds (“CLO Fund Securities”). In addition, from time to time the Company may invest in the equity securities of privately held middle market companies and may also receive warrants or options to purchase common stock in connection with its debt investments.

The Company has elected to be treated and intends to continue to qualify as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”). To qualify as a RIC, the Company must, among other things, meet certain source-of-income, asset diversification and annual distribution requirements. As a RIC, the Company generally will not have to pay corporate-level U.S. federal income taxes on any income that it distributes in a timely manner to its stockholders.

On March 29, 2018, the Company’s Board of Directors (the “Board”), including a “required majority” (as such term is defined in Section 57(o) of the 1940 Act) of the Board, approved the modified asset coverage requirements set forth in Section 61(a)(2) of the 1940 Act, as amended by the Small Business Credit Availability Act (“SBCA”). As a result, the Company’s asset coverage requirement for senior securities changed from 200% to 150%, effective as of March 29, 2019.

During the third quarter of 2017, the Company formed a joint venture with Freedom 3 Opportunities LLC (“Freedom 3 Opportunities”), an affiliate of Freedom 3 Capital LLC, to create KCAP Freedom 3 LLC (the “F3C Joint Venture”). The F3C Joint Venture may originate loans from time to time and sell them to the fund capitalized by the F3C Joint Venture.

On November 8, 2018, the Company entered into an agreement with LibreMax Intermediate Holdings, LP (“LibreMax”) under which Commodore Holdings, LLC (“Commodore”), a wholly-owned subsidiary of the Company, sold the Company’s wholly-owned asset manager subsidiaries Katonah Debt Advisors, LLC (“Katonah Debt Advisors”), Trimaran Advisors, L.L.C. (“Trimaran Advisors”), and Trimaran Advisors Management, L.L.C. (“Trimaran Advisors Management” and, together with Katonah Debt Advisors and Trimaran Advisors, the “Disposed Manager Affiliates”), for a cash purchase price of approximately $37.9 million (the “LibreMax Transaction”). The LibreMax Transaction closed on December 31, 2018. As of December 31, 2024, the Company’s remaining wholly-owned asset management subsidiaries (the “Asset Manager Affiliates”) were comprised of Katonah Management Holdings, LLC and KCAP Management, LLC. Prior to their sale in the LibreMax Transaction, the Disposed Manager Affiliates represented substantially all of the Company’s investment in the Asset Manager Affiliates.

The Externalization Agreement

On December 14, 2018, the Company entered into a stock purchase and transaction agreement (the “Externalization Agreement”) with BC Partners Advisors L.P. (“BCP”), an affiliate of BC Partners LLP, (“BC Partners”), through which Sierra Crest Investment Management LLC (the “Adviser”), an affiliate of BC Partners, became the Company’s investment adviser pursuant to an investment advisory Agreement (the “Advisory Agreement”) with the Company. At a special meeting of the Company’s stockholders (the “Special Meeting”) held on February 19, 2019, the Company’s stockholders approved the Advisory Agreement. The transactions contemplated by the Externalization Agreement closed on April 1, 2019 (the “Closing”), and the Company commenced operations as an externally managed BDC managed by the Adviser on that date.

On the date of the Closing, the Company changed its name from KCAP Financial, Inc. to Portman Ridge Finance Corporation and on April 2, 2019, began trading on the NASDAQ Global Select Market under the symbol “PTMN.”

About the Adviser

The Adviser is an affiliate of BC Partners. Subject to the overall supervision of the Board, the Adviser is responsible for managing the Company’s business and activities, including sourcing investment opportunities, conducting research, performing diligence on potential investments, structuring the Company’s investments, and monitoring the Company’s portfolio companies on an ongoing basis through a team of investment professionals.

The Adviser seeks to invest on behalf of the Company in performing, well-established middle market businesses that operate across a wide range of industries (i.e., no concentration in any one industry). The Adviser employs fundamental credit analysis, targeting investments in businesses with relatively low levels of cyclicality and operating risk. The holding size of each position will generally be dependent upon a number of factors including total facility size, pricing and structure, and the number of other lenders in the facility. The Adviser has experience managing levered vehicles, both public and private, and seeks to enhance the Company’s returns through the use of leverage with a prudent approach that prioritizes capital preservation. The Adviser believes this strategy and approach offers attractive risk/return with lower volatility given the potential for fewer defaults and greater resilience through market cycles.

During the fourth quarter of 2020, LibreMax Intermediate Holdings, LP (“LibreMax”) sold its minority stake in the Adviser to a wholly-owned subsidiary of Mount Logan Capital Inc. (“Mount Logan”). An affiliate of BC Partners serves as administrator to Mount Logan.

OHAI Transaction

On December 18, 2019, we completed our acquisition of OHA Investment Corporation (“OHAI”). In accordance with the terms of the merger agreement, each share of common stock, par value $0.001 per share, of OHAI (the “OHAI Common Stock”) issued and outstanding was converted into the right to receive (i) an amount in cash, without interest, equal to approximately $0.42, and (ii) 0.3688 shares of common stock, par value $0.01 per share, of the Company (plus any applicable cash in lieu of fractional shares). Each share of OHAI Common Stock issued and outstanding received, as additional consideration funded by the Adviser, an amount in cash, without interest, equal to approximately $0.15.

GARS Transaction

On October 28, 2020, we completed our acquisition of Garrison Capital Inc., a publicly traded BDC (“GARS”, and such transaction the “GARS Acquisition”). To effect the acquisition, our wholly owned merger subsidiary merged with and into GARS, with GARS surviving the merger as our wholly owned subsidiary. Immediately thereafter and as a single integrated transaction, GARS consummated a second merger, whereby GARS merged with and into us, with the Company surviving the merger.

In accordance with the terms of the merger agreement for the GARS Acquisition, dated June 24, 2020 (the “GARS Merger Agreement”), each share of common stock, par value $0.001 per share, of GARS (the “GARS Common Stock”) issued and outstanding was converted into the right to receive (i) an amount in cash, without interest, equal to approximately $1.19 and (ii) approximately 1.917 shares of common stock, par value $0.01 per share, of the Company (plus any applicable cash in lieu of fractional shares). Each share of GARS Common Stock issued and outstanding received, as additional consideration funded by the Adviser, an amount in cash, without interest, equal to approximately $0.31.

HCAP Transaction

On June 9, 2021, we completed our acquisition of Harvest Capital Credit Corporation, a publicly traded BDC (“HCAP”, and such transaction the “HCAP Acquisition”). To effect the acquisition, our wholly owned merger subsidiary (“Acquisition Sub”) merged with and into HCAP, with HCAP surviving the merger as the Company’s wholly owned subsidiary. Immediately thereafter and as a single integrated transaction, HCAP consummated a second merger, whereby HCAP merged with and into the Company, with the Company surviving the merger. As a result of, and as of the effective time of, the second merger, HCAP’s separate corporate existence ceased.

Under the terms of the merger agreement for the HCAP Acquisition, dated December 23, 2020 (the “HCAP Merger Agreement”), HCAP stockholders as of immediately prior to the effective time of the first merger (other than shares held by a subsidiary of HCAP or held, directly or indirectly, by the Company or Acquisition Sub, and all treasury shares (collectively, “Cancelled Shares”)) received a combination of (i) $18.54 million in cash paid by the Company, (ii) 15,252,453 validly issued, fully paid and non-assessable shares of the Company’s common stock, par value $0.01 per share, and (iii) an additional cash payment from the Adviser of $2.15 million in the aggregate.

Reverse Stock Split

On August 23, 2021, the Company filed a Certificate of Amendment (the “Reverse Stock Split Certificate of Amendment”) to the Company’s Certificate of Incorporation with the Secretary of State of the State of Delaware to effect a 1-for-10 reverse stock split of the issued and outstanding (or held in treasury) shares of the Company’s common stock, par value $0.01 per share (the “Reverse Stock Split”). The Reverse Stock Split became effective as of 12:01 a.m. (Eastern Time) on August 26, 2021.

As a result of the Reverse Stock Split, every ten shares of issued and outstanding common stock were automatically combined into one issued and outstanding share of common stock, without any change in the par value per share. No fractional shares were issued as a result of the Reverse Stock Split. Instead, any stockholder who would have been entitled to receive a fractional share as a result of the Reverse Stock Split received cash payments in lieu of such fractional shares (without interest and subject to backup withholding and applicable withholding taxes).

On August 23, 2021, the Company filed a Certificate of Amendment to decrease the number of authorized shares of common stock by one half of the reverse stock split ratio (the “Decrease Shares Certificate of Amendment”) with the Secretary of State of the State of Delaware. The Decrease Shares Certificate of Amendment became effective as of 12:05 a.m. (Eastern Time) on August 26, 2021. Following the effectiveness of the Decrease Shares Certificate of Amendment, the number of authorized shares of common stock under the Company’s Certificate of Incorporation was reduced from 100 million shares to 20 million shares.

The Reverse Stock Split Certificate of Amendment and the Decrease Shares Certificate of Amendment were approved by the Company’s stockholders at its annual meeting held on June 7, 2021 and were approved by the Board on August 4, 2021.