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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Sep. 30, 2025
--- | --- | ---
Investments at cost | $ 2,683,700 | [1],[2],[3],[4] | $ 2,819,393 | [5],[6],[7],[8]
Cash and cash equivalents, cost | 40,143 |  | 40,729 |
Cash equivalents at cost | 40,143 |  | 40,729 |
Cash At Cost | 55,121 | [3],[4] | 81,955 | [7],[8]
Unfunded commitments to fund investments | 200 |  | 400 |
PennantPark Senior Secured Loan Fund I LLC |  |  |  |
Investments at cost | 1,224,427 |  | 1,103,716 |
Cash equivalents at cost | 18,863 |  | 47,870 |
Cash At Cost | 14,853 |  | 13,690 |
2036 Asset-backed debt, net | 246,000 |  | 246,000 |
2037 Asset-backed debt, net | 246,000 |  | 246,000 |
2037 R Asset-backed debt, net | 246,000 |  | 246,000 |
PennantPark Senior Secured Loan Fund II LLC |  |  |  |
Investments at cost | 193,632 |  |  |
Cash equivalents at cost | 2 |  |  |
Cash At Cost | 6,775 |  |  |
2036 Asset-backed debt | PennantPark Senior Secured Loan Fund I LLC |  |  |  |
Unamortized Deferred Financing Costs | 1,269 |  | 1,341 |
2037 Asset-Backed Debt | PennantPark Senior Secured Loan Fund I LLC |  |  |  |
Unamortized Deferred Financing Costs | 1,818 |  | 1,904 |
2037 R Asset-backed debt | PennantPark Senior Secured Loan Fund I LLC |  |  |  |
Unamortized Deferred Financing Costs | $ 2,407 |  | $ 2,518 |
[1] | All of our investments are not registered under the 1933 Act and have restrictions on resale.
[2] | As of December 31, 2025, all investments were in U.S. companies and total cost, fair value, and percentage of Net Assets for the U.S companies were $2,683.7 million, $2,605.3 million, and 250.4%
[3] | The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[4] | The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities.
[5] | All of our investments are not registered under the 1933 Act and have restrictions on resale.
[6] | As of September 30, 2025, all investments were in U.S companies and total cost, fair value, and percentage of Net Assets for the U.S. companies were $2,819.4 million, $2,773.3 million, and 258.1%
[7] | The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[8] | The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities.

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