v3.25.3
Consolidated Schedule of Investments (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Percentage representing senior secured loans in investments owned   112.50%
Percentage representing net assets in investments owned 100.00% 100.00%
Percentage representing total investments and cash equivalents 249.50% 242.00%
Percentage liabilities in excess of other assets (149.50%) (142.00%)
Percentage of outstanding voting securities of the investment 25.00% 25.00%
Percentage of non-qualifying assets in the portfolio of total assets 27.90% 26.30%
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net $ 8,612 $ 7,625
Tax Basis of Investments, Gross, Unrealized Appreciation 125,437 109,461
Tax Basis of Investments, Gross, Unrealized Depreciation 116,825 101,836
Investment Owned tax costs 2,096,681 1,998,009
Investment Company Change in Net Assets    
Beginning balance [1] 2,005,634  
Ending balance $ 2,105,293 $ 2,005,634 [1]
US Treasury Bill [Member]    
Percentage representing investments on securities 4.02% 4.24%
Cash Equivalents [Member]    
Cash equivalents, percent of net assets 37.50% 40.00%
Senior Secured Loans [Member]    
Percentage representing net assets in investments owned [2] 126.00%  
Investment Company Change in Net Assets    
Beginning balance $ 1,117,118  
Ending balance $ 1,251,236 $ 1,117,118
Equipment Financing [Member]    
Percentage representing net assets in investments owned 12.30% 18.20%
Investment Company Change in Net Assets    
Beginning balance $ 181,016  
Ending balance $ 121,823 $ 181,016
Preferred Equity [Member]    
Percentage representing net assets in investments owned 3.20% 3.20%
Investment Company Change in Net Assets    
Beginning balance $ 31,682  
Ending balance $ 32,156 $ 31,682
Common Equity/Equity Interests/Warrants [Member]    
Percentage representing net assets in investments owned 70.50% 68.10%
Investment Company Change in Net Assets    
Beginning balance $ 675,818  
Ending balance $ 700,078 $ 675,818
Securities Investment [Member]    
Percentage representing net assets in investments owned 212.00% [2] 202.00% [1]
Spread One [Member]    
Investment interest rate, Paid in kind 0.50% 4.75%
Debt instrument variable interest rate spread 600.00% 200.00%
Spread Two [Member]    
Investment interest rate, Paid in kind 2.75%  
Debt instrument variable interest rate spread 475.00% 795.00%
Spread Three [Member]    
Investment interest rate, Paid in kind 4.75%  
Debt instrument variable interest rate spread 200.00% 425.00%
Spread Four [Member]    
Debt instrument variable interest rate spread 795.00% 400.00%
Spread Five [Member]    
Debt instrument variable interest rate spread 425.00% 650.00%
Spread Six [Member]    
Investment interest rate, Paid in kind   5.00%
Debt instrument variable interest rate spread 400.00% 700.00%
Investment, interest rate, paid in cash   2.00%
Spread Seven [Member]    
Investment interest rate, Paid in kind   1.00%
Debt instrument variable interest rate spread 650.00% 600.00%
Spread Eight [Member]    
Investment interest rate, Paid in kind 5.00%  
Debt instrument variable interest rate spread 700.00% 550.00%
Investment, interest rate, paid in cash 2.00%  
Spread Nine [Member]    
Investment interest rate, Paid in kind 1.00%  
Debt instrument variable interest rate spread 600.00% 650.00%
SLR Senior Lending Program LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance [3] $ 178,740  
Ending balance $ 187,210 [4] $ 178,740 [3]
Kaseya Inc [Member]    
Investment interest rate, Paid in kind   2.50%
ASC Holdco LLC [Member]    
Investment Company Percentage of Holding 5.70% 5.70%
Companies more than 25% owned [Member]    
Investment Company Change in Net Assets    
Beginning balance $ 888,232 $ 839,074
Gross Additions 111,914 69,886
Gross Reductions 118,150 23,346
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 4,376 2,731
Ending balance 886,421 888,232
Interest/ Dividend/ Other Income 61,775 66,511
Companies more than 25% owned [Member] | Equipment Operating Leases LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 2,812 3,296
Gross Additions 0 0
Gross Reductions 2,884 496
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 72 12
Ending balance 0 2,812
Interest/ Dividend/ Other Income 104 264
Companies more than 25% owned [Member] | Kingsbridge Holdings, LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 100,500 96,000
Gross Additions 0 4,500
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (49) 113
Ending balance 100,500 100,500
Interest/ Dividend/ Other Income 8,780 11,972
Companies more than 25% owned [Member] | BH Topco LLC (Kingsbridge) [Member]    
Investment Company Change in Net Assets    
Beginning balance 152,071 142,000
Gross Additions 4,514 4,323
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 15,415 5,748
Ending balance 172,000 152,071
Interest/ Dividend/ Other Income 14,803 12,159
Companies more than 25% owned [Member] | Loyer Capital LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 7,361 7,361
Gross Additions 0 0
Gross Reductions 7,500 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 139 0
Ending balance 0 7,361
Interest/ Dividend/ Other Income 406 757
Companies more than 25% owned [Member] | RD Holdco Inc Common Equity [Member]    
Investment Company Change in Net Assets    
Beginning balance 0 0
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 0 0
Interest/ Dividend/ Other Income 0 0
Companies more than 25% owned [Member] | RD Holdco Inc Class B [Member]    
Investment Company Change in Net Assets    
Beginning balance 0 0
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 0 0
Interest/ Dividend/ Other Income 0 0
Companies more than 25% owned [Member] | RD Holdco Inc Debt [Member]    
Investment Company Change in Net Assets    
Beginning balance 7,827 7,827
Gross Additions 0 0
Gross Reductions 2,025 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 (0)
Ending balance 5,802 7,827
Interest/ Dividend/ Other Income 0 0
Companies more than 25% owned [Member] | SLR Business Credit [Member]    
Investment Company Change in Net Assets    
Beginning balance 125,370 90,370
Gross Additions 0 30,000
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 7,630 5,000
Ending balance 133,000 125,370
Interest/ Dividend/ Other Income 10,950 8,350
Companies more than 25% owned [Member] | SLR Business Credit revolver [Member]    
Investment Company Change in Net Assets    
Beginning balance 0 0
Gross Additions 15,500 19,000
Gross Reductions 15,500 19,000
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 0 0
Interest/ Dividend/ Other Income 9 33
Companies more than 25% owned [Member] | SLR Credit Solutions [Member]    
Investment Company Change in Net Assets    
Beginning balance 288,250 284,000
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (4,250) 4,250
Ending balance 284,000 288,250
Interest/ Dividend/ Other Income 16,900 20,500
Companies more than 25% owned [Member] | SLR Equipment Finance Equity [Member]    
Investment Company Change in Net Assets    
Beginning balance 107,600 120,820
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (12,600) (13,220)
Ending balance 95,000 107,600
Interest/ Dividend/ Other Income 0 0
Companies more than 25% owned [Member] | SLR Equipment Finance Debt [Member]    
Investment Company Change in Net Assets    
Beginning balance 3,000 3,850
Gross Additions 15,100 3,000
Gross Reductions 10,600 3,850
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 7,500 3,000
Interest/ Dividend/ Other Income 226 28
Companies more than 25% owned [Member] | SLR Healthcare ABL [Member]    
Investment Company Change in Net Assets    
Beginning balance 37,850 35,850
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (350) 2,000
Ending balance 37,500 37,850
Interest/ Dividend/ Other Income 4,967 5,123
Companies more than 25% owned [Member] | SLR Healthcare ABL revolver [Member]    
Investment Company Change in Net Assets    
Beginning balance 4,000 0
Gross Additions 76,800 4,000
Gross Reductions 79,000 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 1,800 4,000
Interest/ Dividend/ Other Income 150 1
Companies more than 25% owned [Member] | SLR Senior Lending Program LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 49,091 43,899
Gross Additions 0 5,000
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (731) 192
Ending balance 48,360 49,091
Interest/ Dividend/ Other Income 4,480 7,262
Companies more than 25% owned [Member] | SOINT LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 2,500 3,801
Gross Additions 0 63
Gross Reductions 641 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (900) (1,364)
Ending balance 959 2,500
Interest/ Dividend/ Other Income 0 62
Companies more than 5% Less Than 25% owned [Member]    
Investment Company Change in Net Assets    
Beginning balance 89,945 44,250
Gross Additions 3,916 43,535
Gross Reductions 135 136
Net realized gain (loss) 0  
Change in unrealized gain (loss) 589 2,105
Ending balance 94,843 89,945
Interest/ Dividend/ Other Income 6,092 4,726
Companies more than 5% Less Than 25% owned [Member] | Vapotherm, Inc. [Member]    
Investment Company Change in Net Assets    
Beginning balance 14,254 0
Gross Additions 0 14,080
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (75) 108
Ending balance 14,357 14,254
Interest/ Dividend/ Other Income 1,276 488
Companies more than 5% Less Than 25% owned [Member] | Bayside Opco L L C One [Member]    
Investment Company Change in Net Assets    
Beginning balance 19,905 19,415
Gross Additions 0 626
Gross Reductions 135 136
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 19,770 19,905
Interest/ Dividend/ Other Income 1,771 2,543
Companies more than 5% Less Than 25% owned [Member] | Bayside Parent Llc Loan [Member]    
Investment Company Change in Net Assets    
Beginning balance 6,008 5,153
Gross Additions 683 855
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 6,691 6,008
Interest/ Dividend/ Other Income 683 850
Companies more than 5% Less Than 25% owned [Member] | Bayside Parent Llc Equity [Member]    
Investment Company Change in Net Assets    
Beginning balance 7,179 3,815
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 3,003 3,364
Ending balance 10,183 7,179
Interest/ Dividend/ Other Income 0 0
Companies more than 5% Less Than 25% owned [Member] | SLR-AMI Topco Blocker, LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 12,778 15,867
Gross Additions 1,219 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (1,991) (3,089)
Ending balance 12,006 12,778
Interest/ Dividend/ Other Income 0 0
Companies more than 5% Less Than 25% owned [Member] | Veronica Holdings, LLC (preferred equity) [Member]    
Investment Company Change in Net Assets    
Beginning balance 29,182 0
Gross Additions 2,014 27,644
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (348) 1,413
Ending balance 31,197 29,182
Interest/ Dividend/ Other Income 2,362 845
Companies more than 5% Less Than 25% owned [Member] | Veronica Holdings, LLC (common equity) [Member]    
Investment Company Change in Net Assets    
Beginning balance 639 0
Gross Additions 0 330
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 309
Ending balance 639 639
Interest/ Dividend/ Other Income $ 0 $ 0
[1] Aggregate net unrealized appreciation for U.S. federal income tax purposes is $7,625; aggregate gross unrealized appreciation and depreciation for U.S. federal tax purposes is $109,461 and $101,836, respectively, based on a tax cost of $1,998,009. Unless otherwise noted, all of the Company’s investments are pledged as collateral against the borrowings outstanding on the Credit Facility (as defined below) (see note 7 to the consolidated financial statements). The Company generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”). These investments are generally subject to certain limitations on resale, and may be deemed to be “restricted securities” under the Securities Act. All investments are Level 3 unless otherwise indicated.
[2] Aggregate net unrealized appreciation for U.S. federal income tax purposes is $8,612; aggregate gross unrealized appreciation and depreciation for U.S. federal tax purposes is $125,437 and $116,825, respectively, based on a tax cost of $2,096,681. Unless otherwise noted, all of the Company’s investments are pledged as collateral against the borrowings outstanding on the Credit Facility (as defined below) (see note 7 to the consolidated financial statements). The Company generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”). These investments are generally subject to certain limitations on resale, and may be deemed to be “restricted securities” under the Securities Act. All investments are Level 3 unless otherwise indicated.
[3] Represents the fair value in accordance with ASC Topic 820. The determination of such fair value is not included in the Board’s valuation process described elsewhere herein.
[4] Represents the fair value in accordance with ASC Topic 820. The determination of such fair value is not included in the Board’s valuation process described elsewhere herein.