FAIR VALUE MEASUREMENTS (Tables)
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6 Months Ended |
Sep. 30, 2026 |
| Fair Value Disclosures [Abstract] |
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| Schedule of Investment Portfolio by Level |
The following fair value hierarchy tables set forth our investment portfolio by level as of September 30, 2026 and March 31, 2026 (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements | | | | at September 30, 2026 Using | | Total | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | Significant Other Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | | Investments: | | | | | | | | | First lien loans | $ | 2,155,196 | | | $ | — | | | $ | — | | | $ | 2,155,196 | | | Second lien loans | 25,098 | | | — | | | — | | | 25,098 | | | Subordinated debt | 1,214 | | | — | | | — | | | 1,214 | | | Preferred equity | 83,488 | | | — | | | — | | | 83,488 | | | Common equity & warrants | 106,876 | | | — | | | — | | | 106,876 | | | Earnout | 1,891 | | | — | | | — | | | 1,891 | | | Subtotal | 2,373,763 | | | — | | | — | | | 2,373,763 | | | Investments measured at net asset value (1) | 36,366 | | | — | | | — | | | — | | | Total Investments at Fair Value | $ | 2,410,129 | | | $ | — | | | $ | — | | | $ | 2,373,763 | | | Derivatives: | | | | | | | | | Derivative liabilities (2) | $ | 4,252 | | | $ | — | | | $ | 4,252 | | | $ | — | | | Total Derivatives at Fair Value | $ | 4,252 | | | $ | — | | | $ | 4,252 | | | $ | — | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements | | | | at March 31, 2026 Using | Asset Category | Total | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | Significant Other Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | | First lien loans | $ | 1,890,406 | | | $ | — | | | $ | — | | | $ | 1,890,406 | | | Second lien loans | 24,931 | | | — | | | — | | | 24,931 | | | Subordinated debt | 1,157 | | | — | | | — | | | 1,157 | | | Preferred equity | 74,638 | | | — | | | — | | | 74,638 | | | Common equity & warrants | 102,276 | | | — | | | — | | | 102,276 | | | Earnout | 4,038 | | | — | | | — | | | 4,038 | | | Total Investments at Fair Value | $ | 2,097,446 | | | $ | — | | | $ | — | | | $ | 2,097,446 | |
(1)Certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in Consolidated Statements of Assets and Liabilities. For our investments in CapTrin and Desert Star at September 30, 2026, the redemption restrictions dictate that we cannot withdraw our membership interest without board approval. We are permitted to sell or transfer our membership interest provided we deliver written notice of such transfer to the other member no later than 30 business days prior to the sale or transfer. (2)See Note 6 - Derivative Instruments for more information.
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| Schedule of Valuation Techniques and Significant Level 3 Inputs |
The tables below present the Valuation Techniques and Significant Unobservable Inputs (ranges and weighted averages) used in the valuation of CSWC’s debt and equity securities at September 30, 2026 and March 31, 2026. Significant Level 3 Inputs were weighted by the relative fair value of the investments. The tables are not intended to be all inclusive, but instead capture the significant unobservable inputs relevant to our determination of fair value.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value at | | Significant | | | | | | Valuation | | September 30, 2026 | | Unobservable | | | | Weighted | | Type | Technique | | (in thousands) | | Inputs | | Range | | Average | | | | | | | | | | | | First lien loans | Income Approach | | $ | 1,882,827 | | | Discount Rate | | 5.5% - 78.7% | | 13.5% | | | | | | | | | | | | Market Approach | | 236,651 | | | Cost | | 98.3 - 99.3 | | 99.0 | | | | | | | | | | | | Enterprise Value Waterfall Approach | | 35,718 | | | EBITDA Multiple | | 6.1x - 7.8x | | 7.6x | | | | | | Discount Rate | | 12.9% - 25.4% | | 14.4% | | Second lien loans | Income Approach | | 25,098 | | | Discount Rate | | 10.7% - 17.8% | | 13.3% | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Subordinated debt | Income Approach | | 608 | | | Discount Rate | | 12.5% - 12.5% | | 12.5% | | | | | | | | | | | | Market Approach | | 49 | | | Cost | | 100.0 - 100.0 | | 100.0 | | Enterprise Value Waterfall Approach | | 557 | | | EBITDA Multiple | | 7.6x - 8.0x | | 7.9x | | | | | | Discount Rate | | 13.2% - 17.5% | | 14.5% | | Preferred equity | Enterprise Value Waterfall Approach | | 81,202 | | | EBITDA Multiple | | 4.5x - 17.6x | | 7.6x | | | | | | Discount Rate | | 12.3% - 48.1% | | 17.0% | | Market Approach | | 2,286 | | | Cost | | 100.0 - 100.0 | | 100.0 | | Common equity & warrants | Enterprise Value Waterfall Approach | | 96,276 | | | EBITDA Multiple | | 3.4x - 16.2x | | 7.2x | | | | | | Discount Rate | | 9.2% - 29.3% | | 14.0% | | Market Approach | | 10,600 | | | Cost | | 100.0 - 100.0 | | 100.0 | | | | | | | | | | | | Earnout | Income Approach | | 1,891 | | | Discount Rate | | 34.4% - 34.4% | | 34.4% | | Total Level 3 Investments | | | $ | 2,373,763 | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value at | | Significant | | | | | | Valuation | | March 31, 2026 | | Unobservable | | | | Weighted | | Type | Technique | | (in thousands) | | Inputs | | Range | | Average | | | | | | | | | | | | First lien loans | Income Approach | | $ | 1,786,594 | | | Discount Rate | | 4.0% - 126.1% | | 11.7% | | | | | | | | | | | | Market Approach | | 85,731 | | | Cost | | 95.2 - 100.0 | | 99.0 | | | | | | | | | | | | Enterprise Value Waterfall Approach | | 18,081 | | | EBITDA Multiple | | 8.4x - 9.0x | | 8.6x | | | | | | Discount Rate | | 12.6% - 19.1% | | 15.0% | | Second lien loans | Income Approach | | 24,931 | | | Discount Rate | | 7.9% - 17.0% | | 11.1% | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Subordinated debt | Income Approach | | 600 | | | Discount Rate | | 10.9% - 10.9% | | 10.9% | | | | | | | | | | | | | | | | | | | | | | Enterprise Value Waterfall Approach | | 557 | | | EBITDA Multiple | | 6.0x - 8.0x | | 6.6x | | | | | | Discount Rate | | 14.3% - 17.4% | | 15.3% | | Preferred equity | Enterprise Value Waterfall Approach | | 73,638 | | | EBITDA Multiple | | 4.0x - 13.8x | | 7.2x | | | | | | Discount Rate | | 11.5% - 47.6% | | 17.8% | | Market Approach | | 1,000 | | | Cost | | 100.0 - 100.0 | | 100.0 | | Common equity & warrants | Enterprise Value Waterfall Approach | | 101,526 | | | EBITDA Multiple | | 3.5x - 16.4x | | 7.9x | | | | | | Discount Rate | | 10.5% - 30.8% | | 14.0% | | Market Approach | | 750 | | | Cost | | 100.0 - 100.0 | | 100.0 | | Earnout | Income Approach | | 4,038 | | | Discount Rate | | 33.4% - 33.4% | | 33.4% | | Total Level 3 Investments | | | $ | 2,097,446 | | | | | | | |
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| Schedule of Changes in Fair Value of Investments Measured Using Level 3 Inputs |
The following tables provide a summary of changes in the fair value of investments measured using Level 3 inputs during the six months ended September 30, 2026 and 2025 (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value March 31, 2026 | | Realized & Unrealized Gains (Losses) | | Purchases of Investments (1) | | Repayments | | PIK Interest Capitalized | | Divestitures | | Conversion/Exchange of Security | | Fair Value September 30, 2026 | | YTD Unrealized Appreciation (Depreciation) on Investments held at period end | | First lien loans | $ | 1,890,406 | | | $ | (21,528) | | | $ | 507,688 | | | $ | (141,756) | | | $ | 10,577 | | | $ | (90,191) | | | $ | — | | | $ | 2,155,196 | | | $ | (21,068) | | | Second lien loans | 24,931 | | | 201 | | | 45 | | | (235) | | | 156 | | | — | | | — | | | 25,098 | | | 202 | | | Subordinated debt | 1,157 | | | 8 | | | 49 | | | — | | | — | | | — | | | — | | | 1,214 | | | 8 | | | Preferred equity | 74,638 | | | 1,833 | | | 7,017 | | | — | | | — | | | — | | | — | | | 83,488 | | | 1,833 | | | Common equity & warrants | 102,276 | | | (3,564) | | | 13,325 | | | — | | | — | | | (5,161) | | | — | | | 106,876 | | | (5,895) | | | Earnout | 4,038 | | | 250 | | | — | | | — | | | — | | | (2,397) | | | — | | | 1,891 | | | 250 | | | JV equity | — | | | (134) | | | 36,500 | | | — | | | — | | | — | | | — | | | 36,366 | | | (134) | | | Total Investments | $ | 2,097,446 | | | $ | (22,934) | | | $ | 564,624 | | | $ | (141,991) | | | $ | 10,733 | | | $ | (97,749) | | | $ | — | | | $ | 2,410,129 | | | $ | (24,804) | | | | | | | | | | | | | | | | | | | | | Fair Value March 31, 2025 | | Realized & Unrealized Gains (Losses) | | Purchases of Investments (1) | | Repayments | | PIK Interest Capitalized | | Divestitures | | Conversion/Exchange of Security | | Fair Value September 30, 2025 | | YTD Unrealized Appreciation (Depreciation) on Investments held at period end | | First lien loans | $ | 1,586,622 | | | $ | (19,113) | | | $ | 236,403 | | | $ | (116,337) | | | $ | 6,107 | | | $ | (1,789) | | | $ | (3,951) | | | $ | 1,687,942 | | | $ | (16,012) | | | Second lien loans | 18,066 | | | (922) | | | 26 | | | — | | | — | | | — | | | — | | | 17,170 | | | (922) | | | Subordinated debt | 1,218 | | | 2 | | | 57 | | | (146) | | | 8 | | | — | | | — | | | 1,139 | | | 2 | | | Preferred equity | 102,918 | | | (7,860) | | | 3,427 | | | — | | | — | | | (31,323) | | | (688) | | | 66,474 | | | (3,475) | | | Common equity & warrants | 76,475 | | | 20,922 | | | 2,563 | | | — | | | — | | | (3,159) | | | 4,639 | | | 101,440 | | | 20,501 | | | Earnout | — | | | 285 | | | 3,457 | | | — | | | — | | | — | | | — | | | 3,742 | | | 285 | | | Total Investments | $ | 1,785,299 | | | $ | (6,686) | | | $ | 245,933 | | | $ | (116,483) | | | $ | 6,115 | | | $ | (36,271) | | | $ | — | | | $ | 1,877,907 | | | $ | 379 | |
(1)Includes purchases of new investments, as well as discount accretion on existing investments.
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