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BORROWINGS (Tables) | 6 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Information Related to the Credit Facility | The following tables summarize noteworthy information related to our Credit Facility:
| As of September 30, 2025 |  | As of March 31, 2025
Commitment amount | $ | 270,000 |  | $ | 270,000
Borrowings outstanding at cost | $ | 97,700 |  | $ | —
Availability(A) | $ | 172,300 |  | $ | 270,000
| For the Three Months Ended September 30, |  | For the Six Months Ended September 30, |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |  |  |
Weighted-average borrowings outstanding | $ | 107,599 |  |  | $ | 60,808 |  |  | $ | 72,153 |  |  | $ | 62,766 |  |  |  |  |  |
Effective interest rate(B) | 8.9 | % |  | 11.0 | % |  | 10.2 | % |  | 10.9 | % |  |  |  |  |
Unused commitment fees incurred | $ | 328 |  |  | $ | 320 |  |  | $ | 920 |  |  | $ | 661 |  |  |  |  |  |
(A)Availability is subject to various constraints, characteristics and applicable advance rates based on collateral quality under our Credit Facility, which equated to an adjusted availability of $172.3 million and $270.0 million as of September 30, 2025 and March 31, 2025, respectively. (B)Excludes the impact of deferred financing costs and includes unused commitment fees.
Schedule of Recurring Fair Value Measurements of Borrowings Using Significant Unobservable Level 3 Inputs | The following tables provide relevant information and disclosures about our Credit Facility as of September 30, 2025 and March 31, 2025 and for the three and six months ended September 30, 2025 and 2024, as required by ASC 820:
| Level 3 – Borrowings
| Recurring Fair Value Measurements Reported in Consolidated Statements of Assets and Liabilities Using Significant Unobservable Inputs (Level 3)
| September 30, 2025 |  | March 31, 2025
Credit Facility | $ | 98,053 |  |  | $ | — |
Fair Value Measurements of Borrowings Using Significant Unobservable Inputs (Level 3) Reported in Consolidated Statements of Assets and Liabilities
| Credit Facility
Three Months Ended September 30, 2025: |
Fair value at June 30, 2025 | $ | 62,269 |
Borrowings | 75,800 |
Repayments | (40,100) |
Unrealized appreciation | 84 |
Fair value at September 30, 2025 | $ | 98,053 |
Six Months Ended September 30, 2025 |
Fair value at March 31, 2025 | $ | — |
Borrowings | 153,300 |
Repayments | (55,600) |
Unrealized appreciation | 353 |
Fair value at September 30, 2025 | $ | 98,053 |
Fair Value Measurements of Borrowings Using Significant Unobservable Inputs (Level 3) Reported in Consolidated Statements of Assets and Liabilities
| Credit Facility
Three Months Ended September 30, 2024: |
Fair value at June 30, 2024 | $ | 63,700 |
Borrowings | 31,500 |
Repayments | (86,300) |
Fair value at September 30, 2024 | $ | 8,900 |
Six Months Ended September 30, 2024 |
Fair value at March 31, 2024 | $ | 67,000 |
Borrowings | 47,800 |
Repayments | (105,900) |
Fair value at September 30, 2024 | $ | 8,900 |
Schedule of Debt | The following tables summarize our 5.00% 2026 Notes, 4.875% 2028 Notes, 8.00% 2028 Notes and 7.875% 2030 Notes as of September 30, 2025 and March 31, 2025:
As of September 30, 2025: |  |  |  |  |  |  |  |  |  |  |  |
Description |  | Ticker Symbol |  | Date Issued |  | Maturity Date(A) |  | Interest Rate |  | Notes Outstanding |  | Principal Amount per Note |  | Aggregate Principal Amount
5.00% 2026 Notes |  | GAINN |  | March 2, 2021 |  | May 1, 2026 |  | 5.00% |  | 5,117,500 |  | $ | 25.00 |  |  | $ | 127,938 |
4.875% 2028 Notes |  | GAINZ |  | August 18, 2021 |  | November 1, 2028 |  | 4.875% |  | 5,382,000 |  | $ | 25.00 |  |  | 134,550 |
8.00% 2028 Notes |  | GAINL |  | May 31, 2023 |  | August 1, 2028 |  | 8.00% |  | 2,990,000 |  | $ | 25.00 |  |  | 74,750 |
7.875% 2030 Notes |  | GAINI |  | December 17, 2024 |  | February 1, 2030 |  | 7.875% |  | 5,060,000 |  | $ | 25.00 |  |  | 126,500 |
Notes payable, gross(B) |  | 18,549,500 |  |  |  | 463,738 |
Less: Unamortized Discounts |  |  |  |  |  | (6,760) |
Notes payable, net(C) |  |  |  |  |  | $ | 456,978 |
As of March 31, 2025: |  |  |  |  |  |  |  |  |  |  |  |
Description |  | Ticker Symbol |  | Date Issued |  | Maturity Date(A) |  | Interest Rate |  | Notes Outstanding |  | Principal Amount per Note |  | Aggregate Principal Amount
5.00% 2026 Notes |  | GAINN |  | March 2, 2021 |  | May 1, 2026 |  | 5.00% |  | 5,117,500 |  | $ | 25.00 |  |  | $ | 127,938 |
4.875% 2028 Notes |  | GAINZ |  | August 18, 2021 |  | November 1, 2028 |  | 4.875% |  | 5,382,000 |  | $ | 25.00 |  |  | 134,550 |
8.00% 2028 Notes |  | GAINL |  | May 31, 2023 |  | August 1, 2028 |  | 8.00% |  | 2,990,000 |  | $ | 25.00 |  |  | 74,750 |
7.875% 2030 Notes |  | GAINI |  | December 17, 2024 |  | February 1, 2030 |  | 7.875% |  | 5,060,000 |  | $ | 25.00 |  |  | 126,500 |
Notes payable, gross(B) |  | 18,549,500 |  |  |  | 463,738 |
Less: Unamortized Discounts |  |  |  |  |  | (8,029) |
Notes payable, net(C) |  |  |  |  |  | $ | 455,709 |
(A)The 5.00% 2026 Notes, the 4.875% 2028 Notes and the 8.00% 2028 Notes can be redeemed at our option at any time. The 7.875% 2030 Notes can be redeemed at our option at any time on or after February 1, 2027. (B)As of September 30, 2025 and March 31, 2025, asset coverage on our senior securities representing indebtedness, calculated pursuant to Sections 18 and 61 of the 1940 Act, was 193.2% and 204.4%, respectively. (C)Reflected as a line item on our accompanying Consolidated Statements of Assets and Liabilities.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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