v3.26.1
Investments - Composition of investment portfolio at cost and fair value (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Investments    
Amortized cost $ 2,986,619 $ 2,883,469 [1],[2],[3],[4],[5]
Fair Value $ 2,960,692 $ 2,882,954 [1],[2],[3],[5]
Percent of Total Investments at Fair Value 100.00% 100.00%
First Lien Loans    
Investments    
Amortized cost $ 2,637,491 $ 2,550,532
Fair Value $ 2,617,370 $ 2,549,002
Percent of Total Investments at Fair Value 88.40% 88.40%
Second Lien Loans    
Investments    
Amortized cost $ 141,138 $ 141,741
Fair Value $ 129,726 $ 133,093
Percent of Total Investments at Fair Value 4.40% 4.60%
Unsecured Notes    
Investments    
Amortized cost $ 155,619 $ 135,834
Fair Value $ 155,317 $ 138,583
Percent of Total Investments at Fair Value 5.20% 4.80%
Preferred Equity    
Investments    
Amortized cost $ 29,972 $ 38,229
Fair Value $ 31,484 $ 40,166
Percent of Total Investments at Fair Value 1.10% 1.40%
Common Equity and Warrants    
Investments    
Amortized cost $ 22,399 $ 17,133
Fair Value $ 28,919 $ 22,110
Percent of Total Investments at Fair Value 1.00% 0.80%
Interest Rate Swaps    
Investments    
Fair Value $ (2,124)  
Percent of Total Investments at Fair Value (0.10%) 0.00%
[1] All investments were qualifying assets as defined under Section 55(a) of the Investment Company Act of 1940, as amended (the "1940 Act"), except for ALP CFO LP 2024-1, Apex Group Treasury LLC, Barings Middle Market CLO Ltd., Best Egg Asset Structured Pass Through Master Trust, Churchill Middle Market CLO Ltd., Claros Mortgage Trust, Inc., Coller Capital, Exeter Short Term Funding LLC, Inizio Group Limited, Ivy Hill Asset Management, Ivy Hill Middle Market Credit Fund XII Ltd, LD Holdings Group LLC., MC CIF Wealth Management (UK) Ltd. New Mountain Guardian IV Income Rated Feeder II, Ltd., New Mountain Guardian IV Rated Feeder III, LTD., and Syntax Systems Limited.
[2] All of the Company’s investments are domiciled in the United States except for Apex Group Treasury LLC, Barings Middle Market CLO Ltd., Inizio Group Limited, MC CIF Wealth Management Ltd, Flow Traders Holding LLC, New Mountain Guardian IV Income Rated Feeder II Ltd & New Mountain Guardian IV Rated Feeder III Ltd, and Syntax Systems Limited, which are domiciled in Ireland, the Cayman Islands, United Kingdom, United Kingdom, Bermuda, Bermuda, and Canada, respectively.
[3] As of December 31, 2025, all investments are pledged as collateral unless otherwise stated.
[4] Cost represents the original cost adjusted for amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.
[5] Unless otherwise indicated, all securities are valued using significant unobservable inputs, which are categorized as Level 3 assets under the definition of ASC 820 fair value hierarchy.