v3.26.1
Investments (Tables)
 9 Months Ended
Jun. 30, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Fair Value, Assets Measured on Recurring Basis
Investments as of June 30, 2026 and September 30, 2025 consisted of the following:
As of June 30, 2026As of September 30, 2025
  PrincipalAmortized
Cost		Fair
Value		PrincipalAmortized
Cost		Fair
Value
Senior secured$1,787,827 $1,782,952 $1,712,492 $2,288,864 $2,283,507 $2,285,901 
One stop7,614,494 7,530,093 7,490,815 5,978,203 5,881,309 5,948,840 
Second lien28,490 28,338 28,205 35,084 34,869 35,084 
Subordinated debt61,870 62,209 60,761 58,087 57,122 57,646 
Structured finance notes227,025 226,923 224,585 161,525 161,487 162,943 
EquityN/A97,143 99,667 N/A61,047 64,837 
Total$9,719,706 $9,727,658 $9,616,525 $8,521,763 $8,479,341 $8,555,251 
Schedules of Portfolio Composition at Amortization Cost and Fair Value
The following tables show the portfolio composition by geographic region at amortized cost and fair value as a percentage of total investments in portfolio companies. The geographic composition is determined by the location of the corporate headquarters of the portfolio company, which is not always indicative of the primary source of the portfolio company’s business.
As of June 30, 2026As of September 30, 2025
Amortized Cost:    
United States  
Southeast$1,892,252 19.5 %$1,698,394 20.0 %
Midwest1,613,425 16.6 1,445,453 17.0 
Mid-Atlantic1,579,538 16.2 1,208,533 14.3 
West1,472,920 15.2 1,159,934 13.7 
Southwest1,139,686 11.7 1,050,633 12.4 
Northeast344,059 3.5 395,788 4.7 
U.S. Territory498 0.0 *12,399 0.1 
United Kingdom765,446 7.9 676,804 8.0 
Germany206,715 2.1 241,578 2.8 
Cayman Islands178,285 1.8 140,879 1.7 
Australia166,523 1.7 162,334 2.0 
Canada138,735 1.4 101,412 1.2 
Jersey101,876 1.1 88,930 1.0 
Finland41,900 0.4 36,394 0.4 
France38,960 0.4 18,800 0.2 
Netherlands27,142 0.3 27,046 0.3 
Israel12,031 0.1 — — 
Luxembourg5,667 0.1 5,505 0.1 
Sweden2,000 0.0 *— — 
Lithuania— — 6,965 0.1 
Spain— — 1,560 0.0 *
Total$9,727,658 100.0 %$8,479,341 100.0 %
Fair Value:      
United States  
Southeast$1,874,381 19.5 %$1,704,931 19.9 %
Midwest1,594,650 16.6 1,447,480 16.9 
Mid-Atlantic1,565,311 16.3 1,215,555 14.2 
West1,442,774 15.0 1,163,587 13.6 
Southwest1,131,453 11.8 1,060,849 12.4 
Northeast330,725 3.4 397,933 4.7 
U.S. Territory501 0.0 *12,497 0.1 
United Kingdom753,588 7.8 686,479 8.0 
Germany207,810 2.2 260,620 3.0 
Cayman Islands176,197 1.8 142,238 1.7 
Australia174,064 1.8 166,823 2.0 
Canada134,624 1.4 101,943 1.2 
Jersey101,888 1.1 91,593 1.1 
Finland42,424 0.4 39,388 0.5 
France39,091 0.4 20,597 0.2 
Netherlands27,388 0.3 28,309 0.3 
Israel12,562 0.1 — — 
Luxembourg5,137 0.1 5,839 0.1 
Sweden1,957 0.0 *— — 
Lithuania— — 7,004 0.1 
Spain— — 1,586 0.0 *
Total$9,616,525 100.0 %$8,555,251 100.0 %

* Represents an amount less than 0.1%.
The industry compositions of the portfolio at amortized cost and fair value as a percentage of total investments in portfolio companies as of June 30, 2026 and September 30, 2025 were as follows:
As of June 30, 2026As of September 30, 2025
Amortized Cost:  
Aerospace & Defense$160,771 1.6 %$120,841 1.4 %
Air Freight & Logistics105,656 1.1 105,489 1.2 
Airlines5,989 0.1 20,374 0.2 
Auto Components103,123 1.1 111,710 1.3 
Automobiles292,115 3.0 268,537 3.2 
Banks22,550 0.2 16,055 0.2 
Beverages82,057 0.8 81,503 1.0 
Building Products2,086 0.0 *3,266 0.0 *
Capital Markets60,403 0.6 66,357 0.8 
Chemicals126,356 1.3 143,213 1.7 
Commercial Services & Supplies257,998 2.6 156,518 1.8 
Construction & Engineering55,965 0.6 89,637 1.1 
Construction Materials16,939 0.2 17,046 0.2 
Consumer Finance25,971 0.3 26,096 0.3 
Containers & Packaging122,668 1.3 111,902 1.3 
Diversified Consumer Services506,728 5.2 379,377 4.5 
Diversified Financial Services505,489 5.2 506,912 6.0 
Electric Utilities6,644 0.1 6,440 0.1 
Electrical Equipment— — 25,413 0.3 
Food & Staples Retailing17,046 0.2 13,666 0.2 
Food Products124,487 1.3 129,183 1.5 
Healthcare Equipment & Supplies642,853 6.6 365,741 4.3 
Healthcare Providers & Services530,360 5.4 531,512 6.3 
Healthcare Technology685,968 7.1 463,153 5.5 
Hotels, Restaurants & Leisure676,238 7.0 576,856 6.8 
Household Durables13,256 0.1 12,994 0.1 
Household Products21,305 0.2 21,453 0.2 
Industrial Conglomerates92,213 0.9 92,567 1.1 
Insurance613,842 6.3 490,870 5.8 
IT Services307,721 3.2 358,874 4.2 
Leisure Products47,265 0.5 50,301 0.6 
Life Sciences Tools & Services57,115 0.6 56,286 0.7 
Machinery54,340 0.6 61,988 0.7 
Media63,521 0.6 63,456 0.7 
Oil, Gas & Consumable Fuels8,053 0.1 19,054 0.2 
Paper & Forest Products5,920 0.1 5,966 0.1 
Personal Products8,995 0.1 12,000 0.1 
Pharmaceuticals115,163 1.2 109,522 1.3 
Professional Services379,316 3.9 354,344 4.2 
Real Estate Management & Development4,865 0.0 *4,899 0.1 
Road & Rail35,769 0.4 98,457 1.2 
Software2,067,335 21.2 1,694,514 20.0 
Specialized Finance226,923 2.3 161,487 1.9 
Specialty Retail354,787 3.6 357,631 4.2 
Trading Companies & Distributors17,041 0.2 16,494 0.2 
Transportation Infrastructure66,496 0.7 68,858 0.8 
Water Utilities 29,957 0.3 30,529 0.4 
Total$9,727,658 100.0 %$8,479,341 100.0 %
* Represents an amount less than 0.1%.
As of June 30, 2026As of September 30, 2025
Fair Value:    
Aerospace & Defense$158,632 1.6 %$121,150 1.4 %
Air Freight & Logistics106,377 1.1 106,153 1.2 
Airlines5,994 0.1 20,423 0.2 
Auto Components100,827 1.1 111,841 1.3 
Automobiles292,020 3.0 271,584 3.2 
Banks22,017 0.2 16,215 0.2 
Beverages80,319 0.8 81,036 0.9 
Building Products2,094 0.0 *3,334 0.0 *
Capital Markets60,193 0.6 66,686 0.8 
Chemicals126,230 1.3 143,537 1.7 
Commercial Services & Supplies257,658 2.7 157,756 1.8 
Construction & Engineering55,596 0.6 90,248 1.0 
Construction Materials17,104 0.2 17,103 0.2 
Consumer Finance25,475 0.3 26,116 0.3 
Containers & Packaging119,253 1.2 112,592 1.3 
Diversified Consumer Services494,694 5.1 376,480 4.4 
Diversified Financial Services501,535 5.2 513,068 6.0 
Electric Utilities6,807 0.1 6,525 0.1 
Electrical Equipment— — 25,764 0.3 
Food & Staples Retailing16,882 0.2 13,746 0.2 
Food Products125,326 1.3 130,252 1.5 
Healthcare Equipment & Supplies644,929 6.7 369,814 4.3 
Healthcare Providers & Services528,214 5.5 535,199 6.3 
Healthcare Technology681,988 7.1 467,734 5.5 
Hotels, Restaurants & Leisure680,585 7.1 581,461 6.8 
Household Durables13,222 0.1 12,986 0.2 
Household Products21,134 0.2 21,573 0.3 
Industrial Conglomerates89,853 0.9 93,342 1.1 
Insurance606,766 6.3 496,022 5.8 
IT Services299,986 3.1 360,665 4.2 
Leisure Products44,060 0.5 49,611 0.6 
Life Sciences Tools & Services56,141 0.6 56,306 0.7 
Machinery53,971 0.6 62,202 0.7 
Media62,581 0.7 63,094 0.7 
Oil, Gas & Consumable Fuels8,038 0.1 19,194 0.2 
Paper & Forest Products5,910 0.1 5,985 0.1 
Personal Products8,983 0.1 12,014 0.1 
Pharmaceuticals115,190 1.2 111,458 1.3 
Professional Services369,930 3.8 354,331 4.1 
Real Estate Management & Development4,566 0.0 *4,904 0.1 
Road & Rail35,754 0.4 98,694 1.2 
Software2,020,709 21.0 1,729,397 20.2 
Specialized Finance224,585 2.3 162,943 1.9 
Specialty Retail352,079 3.7 360,091 4.2 
Trading Companies & Distributors16,154 0.2 15,336 0.2 
Transportation Infrastructure66,178 0.7 68,507 0.8 
Water Utilities 29,986 0.3 30,779 0.4 
Total$9,616,525 100.0 %$8,555,251 100.0 %
* Represents an amount less than 0.1%.