v3.26.1
Consolidated Schedule of Investments (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Percentage representing net assets in investments owned 100.00% 100.00%
Percentage representing total investments and cash equivalents 252.60% 248.30%
Percentage liabilities in excess of other assets (152.60%) (148.30%)
Percentage of outstanding voting securities of the investment 25.00% 25.00%
Percentage of non-qualifying assets in the portfolio of total assets 26.00% 26.10%
Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net $ 18,322 $ 19,022
Tax Basis of Investments, Gross, Unrealized Appreciation 135,819 131,599
Tax Basis of Investments, Gross, Unrealized Depreciation 117,497 112,577
Investment Owned tax costs 2,094,882 2,105,790
Investment Company Change in Net Assets    
Beginning balance 2,124,812  
Ending balance $ 2,113,204 $ 2,124,812
US Treasury Bill [Member]    
Percentage representing investments on securities 3.67% 3.61%
Cash Equivalents [Member]    
Cash equivalents, percent of net assets 39.30% 35.00%
Senior Secured Loans [Member]    
Percentage representing net assets in investments owned 125.10% [1] 126.50%
Investment Company Change in Net Assets    
Beginning balance $ 1,260,389  
Ending balance $ 1,239,329 $ 1,260,389
Equipment Financing [Member]    
Percentage representing net assets in investments owned 11.30% 11.90%
Investment Company Change in Net Assets    
Beginning balance $ 119,021  
Ending balance $ 111,569 $ 119,021
Preferred Equity [Member]    
Percentage representing net assets in investments owned 3.40% 3.30%
Investment Company Change in Net Assets    
Beginning balance $ 32,858  
Ending balance $ 33,576 $ 32,858
Common Equity/Equity Interests/Warrants [Member]    
Percentage representing net assets in investments owned 73.50% 71.60%
Investment Company Change in Net Assets    
Beginning balance $ 712,544  
Ending balance $ 728,730 $ 712,544
Securities Investment [Member]    
Percentage representing net assets in investments owned 213.30% [1] 213.30% [2]
Spread One [Member]    
Investment interest rate, Paid in kind 0.50% 0.50%
Debt instrument variable interest rate spread 600.00% 600.00%
Spread Two [Member]    
Investment interest rate, Paid in kind 2.75% 2.75%
Debt instrument variable interest rate spread 475.00% 475.00%
Spread Three [Member]    
Investment interest rate, Paid in kind   4.75%
Debt instrument variable interest rate spread   200.00%
Spread Four [Member]    
Debt instrument variable interest rate spread 795.00% 795.00%
Spread Five [Member]    
Debt instrument variable interest rate spread 425.00% 425.00%
Spread Six [Member]    
Debt instrument variable interest rate spread 400.00% 400.00%
Spread Seven [Member]    
Debt instrument variable interest rate spread 650.00% 650.00%
Spread Eight [Member]    
Investment interest rate, Paid in kind   5.00%
Debt instrument variable interest rate spread 700.00% 700.00%
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%
SLR Senior Lending Program LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance [3] $ 181,369  
Ending balance $ 187,531 [4] $ 181,369 [3]
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 $ 933,923 $ 888,232
Gross Additions 20,252 190,086
Gross Reductions 14,200 153,322
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 6,080 8,861
Ending balance 946,073 933,923
Interest/ Dividend/ Other Income 18,102 80,776
Companies more than 25% owned [Member] | Equipment Operating Leases LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 0 2,812
Gross Additions   0
Gross Reductions   2,884
Net realized gain (loss)   0
Change in unrealized gain (loss)   72
Ending balance   0
Interest/ Dividend/ Other Income   104
Companies more than 25% owned [Member] | Kingsbridge Holdings, LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 142,500 100,500
Gross Additions 0 42,000
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (18) (66)
Ending balance 142,500 142,500
Interest/ Dividend/ Other Income 3,873 11,936
Companies more than 25% owned [Member] | KBH Topco, LLC (Kingsbridge) [Member]    
Investment Company Change in Net Assets    
Beginning balance 172,000 152,071
Gross Additions 11,052 4,514
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 3,415 15,415
Ending balance 186,467 172,000
Interest/ Dividend/ Other Income 3,794 19,022
Companies more than 25% owned [Member] | Loyer Capital LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 0 7,361
Gross Additions   0
Gross Reductions   7,500
Net realized gain (loss)   0
Change in unrealized gain (loss)   139
Ending balance   0
Interest/ Dividend/ Other Income   405
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 Class C [Member]    
Investment Company Change in Net Assets    
Beginning balance 13,408 0
Gross Additions 0 10,272
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 3,136
Ending balance 13,408 13,408
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 0 7,827
Gross Additions   0
Gross Reductions   12,297
Net realized gain (loss)   0
Change in unrealized gain (loss)   4,470
Ending balance   0
Interest/ Dividend/ Other Income   0
Companies more than 25% owned [Member] | SLR Business Credit revolver [Member]    
Investment Company Change in Net Assets    
Beginning balance 0 0
Gross Additions 0 15,500
Gross Reductions 0 15,500
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 0 0
Interest/ Dividend/ Other Income 0 9
Companies more than 25% owned [Member] | SLR Business Credit [Member]    
Investment Company Change in Net Assets    
Beginning balance 133,000 125,370
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 2,000 7,630
Ending balance 135,000 133,000
Interest/ Dividend/ Other Income 2,500 14,875
Companies more than 25% owned [Member] | SLR Credit Solutions [Member]    
Investment Company Change in Net Assets    
Beginning balance 281,000 288,250
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (0) (7,250)
Ending balance 281,000 281,000
Interest/ Dividend/ Other Income 4,000 20,900
Companies more than 25% owned [Member] | SLR Equipment Finance Equity [Member]    
Investment Company Change in Net Assets    
Beginning balance 95,000 107,600
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 1,000 (12,600)
Ending balance 96,000 95,000
Interest/ Dividend/ Other Income 1,000 0
Companies more than 25% owned [Member] | SLR Equipment Finance Debt [Member]    
Investment Company Change in Net Assets    
Beginning balance 8,500 3,000
Gross Additions 3,500 19,100
Gross Reductions 8,500 13,600
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 3,500 8,500
Interest/ Dividend/ Other Income 46 357
Companies more than 25% owned [Member] | SLR Healthcare ABL [Member]    
Investment Company Change in Net Assets    
Beginning balance 37,500 37,850
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (0) (350)
Ending balance 37,500 37,500
Interest/ Dividend/ Other Income 1,378 7,369
Companies more than 25% owned [Member] | SLR Healthcare ABL revolver [Member]    
Investment Company Change in Net Assets    
Beginning balance 1,800 4,000
Gross Additions 5,700 98,700
Gross Reductions 5,700 100,900
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 1,800 1,800
Interest/ Dividend/ Other Income 47 205
Companies more than 25% owned [Member] | SLR Senior Lending Program LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 48,256 49,091
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (317) (835)
Ending balance 47,939 48,256
Interest/ Dividend/ Other Income 1,464 5,594
Companies more than 25% owned [Member] | SOINT LLC [Member]    
Investment Company Change in Net Assets    
Beginning balance 959 2,500
Gross Additions 0 0
Gross Reductions 0 641
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (0) (900)
Ending balance 959 959
Interest/ Dividend/ Other Income 0 0
Companies more than 5% Less Than 25% owned [Member]    
Investment Company Change in Net Assets    
Beginning balance 98,067 89,945
Gross Additions 1,464 5,163
Gross Reductions 45 180
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (321) 2,429
Ending balance 99,351 98,067
Interest/ Dividend/ Other Income 2,055 8,203
Companies more than 5% Less Than 25% owned [Member] | Vapotherm, Inc. [Member]    
Investment Company Change in Net Assets    
Beginning balance 14,368 14,254
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (60) (126)
Ending balance 14,368 14,368
Interest/ Dividend/ Other Income 422 1,741
Companies more than 5% Less Than 25% owned [Member] | Bayside Opco L L C One [Member]    
Investment Company Change in Net Assets    
Beginning balance 19,725 19,905
Gross Additions 372 0
Gross Reductions 45 180
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 20,052 19,725
Interest/ Dividend/ Other Income 549 2,350
Companies more than 5% Less Than 25% owned [Member] | Bayside Parent Llc Loan [Member]    
Investment Company Change in Net Assets    
Beginning balance 6,933 6,008
Gross Additions 239 925
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 7,172 6,933
Interest/ Dividend/ Other Income 240 925
Companies more than 5% Less Than 25% owned [Member] | Bayside Parent Llc Equity [Member]    
Investment Company Change in Net Assets    
Beginning balance 12,497 7,179
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 5,318
Ending balance 12,497 12,497
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 12,006 12,778
Gross Additions 135 1,521
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (135) (2,293)
Ending balance 12,006 12,006
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 31,899 29,182
Gross Additions 718 2,717
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) (126) (470)
Ending balance 32,617 31,899
Interest/ Dividend/ Other Income 844 3,187
Companies more than 5% Less Than 25% owned [Member] | Veronica Holdings, LLC (common equity) [Member]    
Investment Company Change in Net Assets    
Beginning balance 639 639
Gross Additions 0 0
Gross Reductions 0 0
Net realized gain (loss) 0 0
Change in unrealized gain (loss) 0 0
Ending balance 639 639
Interest/ Dividend/ Other Income $ 0 $ 0
[1] Aggregate net unrealized appreciation for U.S. federal income tax purposes is $18,322; aggregate gross unrealized appreciation and depreciation for U.S. federal tax purposes is $135,819 and $117,497, respectively, based on a tax cost of $2,094,882. 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 $19,022; aggregate gross unrealized appreciation and depreciation for U.S. federal tax purposes is $131,599 and $112,577, respectively, based on a tax cost of $2,105,790. 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.