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Investments - Summary of PSSLs Portfolio at Fair Value (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2025 USD ($) Portfolio | Sep. 30, 2025 USD ($) Portfolio
Schedule Of Investments [Line Items] |  |  |  |
Non-controlled, non-affiliated investments | $ 2,605,347 | [1],[2],[3],[4],[5] | $ 2,773,328 | [6],[7],[8],[9],[10]
PennantPark Senior Secured Loan Fund I LLC |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Non-controlled, non-affiliated investments | 1,195,016 |  | 1,084,649 |
PennantPark Senior Secured Loan Fund LLC Portfolio [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Non-controlled, non-affiliated investments | $ 1,195,016 |  | $ 1,084,649 |
Weighted average cost yield on income producing investments | 9.60% |  | 10.10% |
Number of portfolio companies in PSSL | Portfolio | 120 |  | 117 |
Largest portfolio company investment | $ 24,965 |  | $ 20,901 |
Total of five largest portfolio company investments | 110,044 |  | $ 99,270 |
PennantPark Senior Secured Loan Fund II LLC |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Non-controlled, non-affiliated investments | $ 193,151 |  |  |
Weighted average cost yield on income producing investments | 9.00% |  |  |
Number of portfolio companies in PSSL | Portfolio | 41 |  |  |
Largest portfolio company investment | $ 6,983 |  |  |
Total of five largest portfolio company investments | $ 34,905 |  |  |
[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] | Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).
[6] | All of our investments are not registered under the 1933 Act and have restrictions on resale.
[7] | 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%
[8] | 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.
[9] | 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.
[10] | Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).

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