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Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Portfolio Investments by Level in the Fair Value Hierarchy | The following table summarizes the levels in the fair value hierarchy that the Company’s portfolio investments fall into as of March 31, 2025:
| Total |  | Level I |  | Level II |  | Level III
First lien | $ | 1,959,038 |  |  | $ | — |  |  | $ | 29,393 |  |  | $ | 1,929,645 |
Second lien | 173,598 |  |  | — |  |  | 48,594 |  |  | 125,004 |
Subordinated | 104,948 |  |  | — |  |  | — |  |  | 104,948 |
Structured Finance Obligations | 3,232 |  |  | — |  |  | — |  |  | 3,232 |
Equity and other | 793,395 |  |  | — |  |  | — |  |  | 793,395 |
Total investments | $ | 3,034,211 |  |  | $ | — |  |  | $ | 77,987 |  |  | $ | 2,956,224 |
The following table summarizes the levels in the fair value hierarchy that the Company’s portfolio investments fall into as of December 31, 2024:
| Total |  | Level I |  | Level II |  | Level III
First lien | $ | 1,956,608 |  |  | $ | — |  |  | $ | 53,998 |  |  | $ | 1,902,610 |
Second lien | 197,050 |  |  | — |  |  | 46,716 |  |  | 150,334 |
Subordinated | 102,034 |  |  | — |  |  | — |  |  | 102,034 |
Structured Finance Obligations | 3,232 |  |  | — |  |  | 3,232 |  |  | — |
Equity and other | 832,100 |  |  | — |  |  | — |  |  | 832,100 |
Total investments | $ | 3,091,024 |  |  | $ | — |  |  | $ | 103,946 |  |  | $ | 2,987,078 |
Schedule of Changes in Level III Portfolio Investments | The following table summarizes the changes in fair value of Level III portfolio investments for the three months ended March 31, 2025, as well as the portion of appreciation (depreciation) included in income attributable to the net change in unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at March 31, 2025:
| Total |  | First Lien |  | Second Lien |  | Subordinated |  | Structured Finance Obligations |  | Equity and other
Fair Value, December 31, 2024 | $ | 2,987,078 |  |  | $ | 1,902,610 |  |  | $ | 150,334 |  |  | $ | 102,034 |  |  | $ | — |  |  | $ | 832,100 |
Total gains or losses included in earnings: |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments | 37,668 |  |  | 67 |  |  | (2,229) |  |  | — |  |  | — |  |  | 39,830 |
Net change in unrealized (depreciation) appreciation of investments | (47,770) |  |  | (712) |  |  | (128) |  |  | 163 |  |  | — |  |  | (47,093) |
Purchases, including capitalized PIK and revolver fundings(1) | 203,575 |  |  | 125,756 |  |  | 4,255 |  |  | 2,751 |  |  | — |  |  | 70,813 |
Proceeds from sales and paydowns of investments(1) | (227,559) |  |  | (98,076) |  |  | (27,228) |  |  | — |  |  | — |  |  | (102,255) |
Transfers into Level III(2) | 3,232 |  |  | — |  |  | — |  |  | — |  |  | 3,232 |  |  | — |
Fair Value, March 31, 2025 | $ | 2,956,224 |  |  | $ | 1,929,645 |  |  | $ | 125,004 |  |  | $ | 104,948 |  |  | $ | 3,232 |  |  | $ | 793,395 |
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: | $ | (61) |  |  | $ | (668) |  |  | $ | (416) |  |  | $ | 163 |  |  | $ | — |  |  | $ | 860 |
(1)Includes non-cash reorganizations and restructurings. (2)As of March 31, 2025, portfolio investments were transferred into Level III from Level II at fair value as of the beginning of the period in which the reclassification occurred. The following table summarizes the changes in fair value of Level III portfolio investments for the three months ended March 31, 2024, as well as the portion of appreciation (depreciation) included in income attributable to the net change in unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at March 31, 2024:
| Total |  | First Lien |  | Second Lien |  | Subordinated |  | Equity and other
Fair Value, December 31, 2023 | $ | 2,938,849 |  |  | $ | 1,637,889 |  |  | $ | 406,180 |  |  | $ | 82,871 |  |  | $ | 811,909 |
Total gains or losses included in earnings: |  |  |  |  |  |  |  |  |
Net realized losses on investments | (11,890) |  |  | (11,859) |  |  | — |  |  | — |  |  | (31) |
Net change in unrealized appreciation (depreciation) of investments | 3,097 |  |  | 15,974 |  |  | 5,557 |  |  | (261) |  |  | (18,173) |
Purchases, including capitalized PIK and revolver fundings(1) | 227,711 |  |  | 172,750 |  |  | 43,125 |  |  | 2,733 |  |  | 9,103 |
Proceeds from sales and paydowns of investments(1) | (170,754) |  |  | (111,778) |  |  | (58,964) |  |  | — |  |  | (12) |
Transfers into Level III(2) | 28,440 |  |  | 28,440 |  |  | — |  |  | — |  |  | — |
Fair Value, March 31, 2024 | $ | 3,015,453 |  |  | $ | 1,731,416 |  |  | $ | 395,898 |  |  | $ | 85,343 |  |  | $ | 802,796 |
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period: | $ | (12,429) |  |  | $ | 3,813 |  |  | $ | 2,216 |  |  | $ | (261) |  |  | $ | (18,197) |
(1)Includes non-cash reorganizations and restructurings. (2)As of March 31, 2024, portfolio investments were transferred into Level III from Level II at fair value as of the beginning of the period in which the reclassification occurred.
Schedule of Fair Value Measurement Inputs and Valuation Techniques | The unobservable inputs used in the fair value measurement of the Company's Level III investments as of March 31, 2025 were as follows:
|  |  |  |  |  |  | Range
Type | Fair Value as of March 31, 2025 |  | Approach |  | Unobservable Input |  | Low |  | High |  | Weighted Average(1)
First lien | $ | 1,885,015 |  |  | Market & Income Approach |  | EBITDA multiple |  | 6.5x |  | 33.0x |  | 14.2x
|  |  |  |  | Revenue multiple |  | 4.0x |  | 18.5x |  | 9.2x
|  |  |  |  | Discount rate |  | 6.3 | % |  | 21.9 | % |  | 9.3 | %
| 44,630 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
Second lien | 125,004 |  |  | Market & Income Approach |  | EBITDA multiple |  | 8.0x |  | 20.0x |  | 17.3x
|  |  |  |  | Discount rate |  | 9.5 | % |  | 13.3 | % |  | 9.9 | %
Subordinated | 104,948 |  |  | Market & Income Approach |  | EBITDA multiple |  | 8.0x |  | 24.5x |  | 15.7x
|  |  |  |  | Discount rate |  | 12.6 | % |  | 27.6 | % |  | 17.6 | %
Structured Finance Obligations | 3,232 |  |  | Income Approach |  | Discount Rate |  | 11.4 | % |  | 11.4 | % |  | 11.4 | %
Equity and other | 399,105 |  |  | Market & Income Approach |  | EBITDA multiple |  | 6.0x |  | 23.0x |  | 11.7x
|  |  |  |  | Revenue multiple |  | 5.0x |  | 20.0x |  | 6.7x
|  |  |  |  | Discount rate |  | 8.6 | % |  | 32.6 | % |  | 9.0 | %
| 386,921 |  |  | Income Approach |  | Discount rate |  | 6.5 | % |  | 13.0 | % |  | 10.0 | %
| 7,369 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
| $ | 2,956,224 |  |  |  |  |  |  |  |  |  |  |
(1)Unobservable inputs were weighted by the relative fair value of the investments. (2)Fair value was determined based on transaction pricing or recent acquisition or sale as the best measure of fair value with no material changes in operations of the related portfolio company since the transaction date. The unobservable inputs used in the fair value measurement of the Company's Level III investments as of December 31, 2024 were as follows:
|  |  |  |  |  |  | Range
Type | Fair Value as of December 31, 2024 |  | Approach |  | Unobservable Input |  | Low |  | High |  | Weighted Average(1)
First lien | $ | 1,884,611 |  |  | Market & income approach |  | EBITDA multiple |  | 6.0x |  | 35.0x |  | 14.8x
|  |  |  |  | Revenue multiple |  | 3.0x |  | 19.5x |  | 6.9x
|  |  |  |  | Discount rate |  | 6.8 | % |  | 22.1 | % |  | 9.8 | %
| 17,999 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
Second lien | 144,003 |  |  | Market & income approach |  | EBITDA multiple |  | 7.0x |  | 20.0x |  | 15.2x
|  |  |  |  | Discount rate |  | 10.1 | % |  | 20.6 | % |  | 12.2 | %
| 6,331 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
Subordinated | 102,034 |  |  | Market & income approach |  | EBITDA multiple |  | 8.0x |  | 21.0x |  | 15.4x
|  |  |  |  | Discount rate |  | 12.5 | % |  | 25.9 | % |  | 16.8 | %
Equity and other | 422,851 |  |  | Market & income approach |  | EBITDA multiple |  | 5.5x |  | 26.5x |  | 12.8x
|  |  |  |  | Revenue multiple |  | 9.0x |  | 19.5x |  | 14.1x
|  |  |  |  | Discount rate |  | 8.2 | % |  | 44.6 | % |  | 8.9 | %
| 387,194 |  |  | Income approach |  | Discount rate |  | 6.4 | % |  | 12.2 | % |  | 9.9 | %
| 22,055 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
| $ | 2,987,078 |  |  |  |  |  |  |  |  |  |  |
(1)Unobservable inputs were weighted by the relative fair value of the investments. (2)Fair value was determined based on transaction pricing or recent acquisition or sale as the best measure of fair value with no material changes in operations of the related portfolio company since the transaction date.
Schedule of Principal Amounts and Fair Values of Borrowings | The following are the principal amounts and fair values of the Company’s borrowings as of March 31, 2025 and December 31, 2024. Fair value is estimated by discounting remaining payments using applicable current market rates, which take into account changes in the Company’s marketplace credit ratings or market quotes, if available.
|  | As of
|  | March 31, 2025 |  | December 31, 2024
|  | Principal Amount |  | Fair Value |  | Principal Amount |  | Fair Value
Unsecured Notes |  | $ | 990,000 |  |  | $ | 993,883 |  |  | $ | 990,000 |  |  | $ | 991,624 |
Holdings Credit Facility |  | 270,563 |  |  | 266,747 |  |  | 294,363 |  |  | 298,435 |
SBA-guaranteed debentures |  | 262,500 |  |  | 231,596 |  |  | 300,000 |  |  | 270,548 |
2022 Convertible Notes |  | 258,784 |  |  | 262,148 |  |  | 260,000 |  |  | 261,811 |
NMFC Credit Facility (1) |  | 29,059 |  |  | 28,678 |  |  | 27,944 |  |  | 26,812 |
Total Borrowings |  | $ | 1,810,906 |  |  | $ | 1,783,052 |  |  | $ | 1,872,307 |  |  | $ | 1,849,230 |
(1) As of March 31, 2025, the principal amount of the NMFC Credit Facility was $29,059, which includes €16,512 denominated in EUR and £8,666 denominated in GBP that has been converted to U.S. dollars. As of March 31, 2025, the fair value of the NMFC Credit Facility was $28,678, which included €16,288 denominated in EUR and £8,560 denominated in GBP that has been converted to U.S. dollars. As of December 31, 2024, the principal amount of the NMFC Credit Facility was $27,944, which included €16,512 denominated in EUR and £8,666 denominated in GBP that has been converted to U.S. dollars. As of December 31, 2024, the fair value of the NMFC Credit Facility was $26,812, which included €15,379 denominated in EUR and £8,700 denominated in GBP that has been converted to U.S. dollars.
Schedule of Notional Amounts and Fair Values of our Derivative Instruments | The following table summarizes the notional amounts and fair values of the Company's derivative instruments as of March 31, 2025. The Company's derivative instruments are considered Level II investments.
|  | As of March 31, 2025 |  | As of December 31, 2024 |
|  | Notional Amount |  | Fair Value |  | Notional Amount |  | Fair Value |  |  |
|  |  | Asset |  | Liability |  |  | Asset |  | Liability |  |  |  |
Derivatives in fair value hedging relationships: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 600,000 |  |  | $ | 3,117 |  |  | $ | (3,368) |  |  | $ | 600,000 |  |  | $ | — |  |  | $ | (7,423) |  |  |  |  |  |
Total derivatives designated as hedging instruments |  | 600,000 |  |  | 3,117 |  |  | (3,368) |  |  | 600,000 |  |  | — |  |  | (7,423) |  |  |  |  |  |
Total derivatives |  | 600,000 |  |  | 3,117 |  |  | (3,368) |  |  | 600,000 |  |  | — |  |  | (7,423) |  |  |  |  |  |
Total net derivatives(1) |  | $ | 600,000 |  |  | $ | — |  |  | $ | (251) |  |  | $ | 600,000 |  |  | $ | — |  |  | $ | (7,423) |  |  |  |  |  |
(1)As of March 31, 2025 and December 31, 2024, the Company had net derivative liabilities at fair value subject to such enforceable master netting arrangement in the amount of $251 and $7,423, respectively and a collateral balance of $10,130 and $3,230, respectively, included in "Payable to broker" on the Consolidated Statements of Assets and Liabilities. If the Company had elected to offset, the net amount would be $0 and $0, respectively.

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