10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

___________________________

FORM 10-Q

___________________________

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2023

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

COMMISSION FILE NUMBER: 814-00841

___________________________

FS Specialty Lending Fund

(Exact name of registrant as specified in its charter)

___________________________

Delaware	27-6822130
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
201 Rouse Boulevard Philadelphia, Pennsylvania	19112
(Address of principal executive office)	(Zip Code)

Registrant’s telephone number, including area code: (215) 495-1150

FS Energy and Power Fund

(Former name)

___________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨.

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No ¨.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	Accelerated filer	Non-accelerated filer	Smaller reporting company	Emerging growth company
¨	¨	x	¨	¨

If an emerging growth company, indicate by check mark if the registrant has elected to not use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No x.

Securities registered pursuant to Section 12(b) Act: None

Title of each class	Trading symbol(s)	Name on each exchange on which registered
N/A	N/A	N/A

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date. The issuer had 455,506,234 common shares of beneficial interest outstanding as of October 31, 2023.

TABLE OF CONTENTS

		Page
PART I—FINANCIAL INFORMATION
ITEM 1.	FINANCIAL STATEMENTS
	Consolidated Balance Sheets as of September 30, 2023 (Unaudited) and December 31, 2022	1
	Unaudited Consolidated Statements of Operations for the three and nine months ended September 30, 2023 and 2022	2
	Unaudited Consolidated Statements of Changes in Net Assets for the three and nine months ended September 30, 2023 and 2022	3
	Unaudited Consolidated Statements of Cash Flows for the nine months ended September 30, 2023 and 2022	4
	Consolidated Schedules of Investments as of September 30, 2023 (Unaudited) and December 31, 2022	5
	Notes to Unaudited Consolidated Financial Statements	18
ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	40
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	54
ITEM 4.	CONTROLS AND PROCEDURES	54
PART II—OTHER INFORMATION
ITEM 1.	LEGAL PROCEEDINGS	55
ITEM 1A.	RISK FACTORS	55
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	55
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	55
ITEM 4.	MINE SAFETY DISCLOSURES	55
ITEM 5.	OTHER INFORMATION	55
ITEM 6.	EXHIBITS	56
	SIGNATURES	58

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements.

FS Specialty Lending Fund

Consolidated Balance Sheets

(in thousands, except share and per share amounts)

	September 30, 2023  (Unaudited)		December 31, 2022
Assets
Investments, at fair value
Non-controlled/unaffiliated investments (amortized cost—$1,256,706 and $1,656,169, respectively)	$	1,351,411	$	1,786,887
Non-controlled/affiliated investments (amortized cost—$25,541 and $94,068, respectively)	13,031		65,777
Controlled/affiliated investments (amortized cost—$170,835 and $172,703, respectively)	128,324		194,451
Total investments, at fair value (amortized cost—$1,453,082 and $1,922,940, respectively)	1,492,766		2,047,115
Cash	289,738		481,655
Restricted cash	2,000		—
Receivable for investments sold and repaid	776		7,022
Interest receivable	10,519		21,932
Dividends receivable	351		878
Unrealized appreciation on swap contracts	106		—
Swap income receivable	29		83
Prepaid expenses and other assets	49		96
Total assets	$	1,796,334	$	2,558,781
Liabilities
Payable for investments purchased	$	50,847	$	—
Repurchase facility payable (net of deferred financing costs of $5,373 and $0, respectively)(1)	74,627		—
Credit facilities payable (net of deferred financing costs of $0 and $238, respectively)(1)	—		305,438
Secured note payable (net of deferred financing costs of $0 and $1,253, respectively)(1)	—		454,671
Unrealized depreciation on swap contracts	404		698
Swap income payable	170		26
Shareholder distributions payable	—		13,543
Management fees payable	7,715		11,185
Administrative services expense payable	1,104		1,086
Interest payable	613		13,371
Trustees' fees payable	163		164
Other accrued expenses and liabilities	3,230		4,851
Total liabilities	138,873		805,033
Commitments and contingencies(2)
Shareholders' equity
Preferred shares, $0.001 par value, 50,000,000 shares authorized, none issued and outstanding	—		—
Common shares, $0.001 par value, 700,000,000 shares authorized, 455,506,234 and 451,465,673 shares issued and outstanding, respectively	456		451
Capital in excess of par value	3,206,837		3,191,293
Accumulated earnings (deficit)	(1,549,832)		(1,437,996)
Total shareholders' equity	1,657,461		1,753,748
Total liabilities and shareholders' equity	$	1,796,334	$	2,558,781
Net asset value per common share at period end	$	3.64	$	3.88

_________________________

(1)    See Note 9 for a discussion of the Company's financing arrangements.

(2)    See Note 10 for a discussion of the Company's commitments and contingencies.

See notes to unaudited consolidated financial statements.

1

FS Specialty Lending Fund

Unaudited Consolidated Statements of Operations

(in thousands, except share and per share amounts)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Investment income
From non-controlled/unaffiliated investments:
Interest income	$	26,497	$	31,049	$	78,286	$	77,902
Paid-in-kind interest income	2,232		5,549		13,783		17,070
Fee income	586		1,061		1,712		4,252
Dividend income	334		479		14,757		479
From non-controlled/affiliated investments:
Interest income	74		129		398		3,069
Paid-in-kind interest income	25		24		73		81
Fee income	—		—		—		7,268
Dividend income	—		—		—		5,417
From controlled/affiliated investments:
Interest income	609		2,271		5,687		6,380
Paid-in-kind interest income	86		226		318		1,117
Dividend income	—		—		—		735
Total investment income	30,443		40,788		115,014		123,770
Operating expenses
Management fees	7,778		11,350		26,957		33,361
Administrative services expenses	1,887		1,695		4,566		4,605
Share transfer agent fees	820		768		2,365		2,216
Accounting and administrative fees	82		369		444		735
Interest expense(1)	738		14,104		19,066		40,994
Trustees' fees	163		161		503		578
Other general and administrative expenses	1,486		842		3,524		2,502
Total operating expenses	12,954		29,289		57,425		84,991
Less: Management fee offset(2)	(63)		(208)		(337)		(2,606)
Net expenses	12,891		29,081		57,088		82,385
Net investment income before taxes	17,552		11,707		57,926		41,385
Federal and state taxes	834		17		2,150		669
Net investment income	16,718		11,690		55,776		40,716
Realized and unrealized gain/loss
Net realized gain (loss) on investments:
Non-controlled/unaffiliated	6,553		2,930		(23,242)		(17,672)
Non-controlled/affiliated	(163)		718		(33,063)		41,922
Controlled/affiliated	—		1,662		—		12,520
Net realized gain (loss) on foreign currency	(3)		(202)		(123)		(202)
Net realized gain (loss) on swap contracts	(138)		(812)		88		(2,620)
Net realized gain (loss) on debt extinguishment	—		—		—		(929)
Net change in unrealized appreciation (depreciation) on investments:
Non-controlled/unaffiliated	3,530		(57,812)		(36,013)		78,475
Non-controlled/affiliated	253		(13,142)		15,781		(11,013)
Controlled/affiliated	(53,363)		344		(64,259)		13,130
Net change in unrealized appreciation (depreciation) on swap contracts	(803)		3,582		400		(6)
Net change in unrealized appreciation (depreciation) on foreign currency	(7)		(59)		27		(59)
Total net realized and unrealized gain (loss)	(44,141)		(62,791)		(140,404)		113,546
Net increase (decrease) in net assets resulting from operations	$	(27,423)	$	(51,101)	$	(84,628)	$	154,262
Per share information—basic and diluted
Net increase (decrease) in net assets resulting from operations (Earnings per Share)	$	(0.06)	$	(0.11)	$	(0.19)	$	0.34
Weighted average shares outstanding	455,401,486		450,023,829		454,052,204		448,729,053

________________________

(1)    See Note 9 for a discussion of the Company's financing arrangements.

(2)    See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.

See notes to unaudited consolidated financial statements.

2

FS Specialty Lending Fund

Unaudited Consolidated Statements of Changes in Net Assets

(in thousands)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Operations
Net investment income	$	16,718	$	11,690	$	55,776	$	40,716
Net realized gain (loss) on investments, foreign currency, swap contracts and debt extinguishment	6,249		4,296		(56,340)		33,019
Net change in unrealized appreciation (depreciation) on investments	(49,580)		(70,610)		(84,491)		80,592
Net change in unrealized appreciation (depreciation) on swap contracts	(803)		3,582		400		(6)
Net change in unrealized appreciation (depreciation) on foreign currency	(7)		(59)		27		(59)
Net increase (decrease) in net assets resulting from operations	(27,423)		(51,101)		(84,628)		154,262
Shareholder distributions(1)
Distributions to shareholders	—		(13,504)		(27,208)		(40,395)
Net decrease in net assets resulting from shareholder distributions	—		(13,504)		(27,208)		(40,395)
Capital share transactions(2)
Reinvestment of shareholder distributions	5,161		5,191		15,549		15,651
Net increase in net assets resulting from capital share transactions	5,161		5,191		15,549		15,651
Total increase (decrease) in net assets	(22,262)		(59,414)		(96,287)		129,518
Net assets at beginning of period	1,679,723		1,791,255		1,753,748		1,602,323
Net assets at end of period	$	1,657,461	$	1,731,841	$	1,657,461	$	1,731,841

_________________________

(1)See Note 5 for a discussion of the sources of distributions paid by the Company.

(2)See Note 3 for a discussion of the Company's common share transactions.

See notes to unaudited consolidated financial statements.

3

FS Specialty Lending Fund

Unaudited Consolidated Statements of Cash Flows

(in thousands)

	Nine Months Ended September 30,
	2023		2022
Cash flows from operating activities
Net increase (decrease) in net assets resulting from operations	$	(84,628)	$	154,262
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of investments	(253,471)		(373,525)
Paid-in-kind interest	(14,174)		(18,268)
Proceeds from sales and repayments of investments	685,682		651,080
Net realized (gain) loss on investments	56,305		(36,770)
Net change in unrealized (appreciation) depreciation on investments	84,491		(80,592)
Net change in unrealized (appreciation) depreciation on swap contracts	(400)		6
Accretion of discount	(4,484)		(5,425)
Amortization of deferred financing costs and discount	2,903		5,155
(Increase) decrease in receivable for investments sold and repaid	6,246		4,958
(Increase) decrease in interest receivable	11,413		8,144
(Increase) decrease in dividends receivable	527		(864)
(Increase) decrease in swap income receivable	54		—
(Increase) decrease in prepaid expenses and other assets	47		18
Increase (decrease) in payable for investments purchased	50,847		(49,500)
Increase (decrease) in swap income payable	144		47
Increase (decrease) in management fees payable	(3,470)		676
Increase (decrease) in administrative services expense payable	18		656
Increase (decrease) in interest payable(1)	(12,758)		(9,402)
Increase (decrease) in trustees' fees payable	(1)		(39)
Increase (decrease) in other accrued expenses and liabilities	(1,621)		(414)
Net cash provided by (used in) operating activities	523,670		250,203
Cash flows from financing activities
Shareholder distributions paid	(25,202)		(24,628)
Borrowings under repurchase facility(1)	80,000		—
Borrowings under credit facilities(1)	—		29,009
Repayments of credit facilities(1)	(305,676)		(10,000)
Repayments under senior secured notes(1)	(457,075)		(31,925)
Deferred financing costs paid	(5,634)		(132)
Net cash provided by (used in) financing activities	(713,587)		(37,676)
Total increase (decrease) in cash	(189,917)		212,527
Cash at beginning of period	481,655		33,879
Cash and restricted cash at end of period(2)	$	291,738	$	246,406
Supplemental disclosure
Non-cash reinvestment of shareholder distributions	$	15,549	$	15,651
Non-cash purchases of investments	$	(3,284)	$	(1,587)
Non-cash sales of investments	$	3,284	$	1,587
Federal and state taxes paid	$	3,596	$	1,024

_________________________

(1)    See Note 9 for a discussion of the Company's financing arrangements. During the nine months ended September 30, 2023 and 2022, the Company paid $28,921 and $45,241, respectively, in interest expense on the financing arrangements and Senior Secured Notes.

(2)    Includes cash of $289,738 and restricted cash of $2,000. Restricted cash is the cash collateral required to be posted pursuant to the Company’s equity total return swap.

See notes to unaudited consolidated financial statements.

4

FS Specialty Lending Fund

Unaudited Consolidated Schedule of Investments

As of September 30, 2023

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Lien—38.1%
Acrisure LLC	(f)(q)	Insurance	S+575	1.0%	2/15/27	$	11,191	$	11,271	$	11,275
AIRRO (Mauritius) Holdings II	(k)(p)(r)	Energy—Power	S+400, 3.0% PIK (3.0% Max PIK)	1.5%	7/24/25	22,970		20,881		22,878
Allied Universal Holdco LLC	(f)(q)	Consumer Services	S+475	0.5%	5/12/28	5,500		5,429		5,431
Allied Universal Holdco LLC	(f)	Consumer Services	S+375	0.5%	5/12/28	9,954		9,638		9,631
Allied Wireline Services, LLC	(f)(m)(o)(r)(t)	Energy—Service & Equipment	10.0% PIK (10.0% Max PIK)		6/15/25	70,277		70,277		37,176
Aveanna Healthcare LLC	(f)	Health Care Equipment & Services	S+375	0.5%	7/17/28	9,949		8,565		8,986
BCPE Empire Holdings, Inc.	(f)(q)	Consumer Services	S+475	0.5%	12/11/28	14,975		15,035		14,992
CCS-CMGC Holdings, Inc.		Health Care Equipment & Services	S+550		10/1/25	997		783		808
CircusTrix Holdings, LLC	(f)(r)	Consumer Services	S+675	1.0%	7/18/28	20,968		20,968		20,968
CircusTrix Holdings, LLC	(e)(r)	Consumer Services	S+675	1.0%	7/18/25	2,688		2,688		2,688
CircusTrix Holdings, LLC	(e)(r)	Consumer Services	S+675	1.0%	7/18/28	1,344		1,344		1,344
Cox Oil Offshore, LLC, Volumetric Production Payments	(g)(i)(r)	Energy—Upstream	8.5%		12/31/23	100,000		3,907		4,275
CPV Shore Holdings LLC	(f)	Energy—Power	S+375		12/27/25	23,172		22,519		21,136
Engineered Machinery Holdings, Inc.	(f)(q)	Capital Goods	S+350	0.8%	5/19/28	9,975		9,950		9,936
First Brands Group, LLC	(f)(q)	Automobiles & Components	S+500	1.0%	3/30/27	9,957		9,760		9,849
FR BR Holdings LLC	(r)	Energy—Midstream	S+650		12/14/23	80,582		80,261		80,405
FR XIII PAA Holdings HoldCo, LLC	(f)(r)	Energy—Midstream	S+750	0.5%	10/15/26	17,122		16,916		17,267
GasLog Ltd.	(k)(r)	Energy—Midstream	7.8%		3/31/29	13,951		13,871		13,263
GIP II Blue Holding LP	(f)	Energy—Midstream	S+450	1.0%	9/29/28	3,137		3,100		3,151
Goodnight Water Solutions, LLC	(f)(r)	Energy—Midstream	S+700	0.5%	6/3/27	14,703		14,511		14,587
Guardian US Holdco, LLC	(f)	Financial Services	S+400	0.5%	1/31/30	9,975		9,975		9,999
Knowlton Development Corporation Inc.	(f)	Household & Personal Products	S+500		8/15/28	21,000		20,370		20,297
Mavis Tire Express Services TopCo, LP	(f)(q)	Consumer Discretionary Distribution & Retail	S+400	0.8%	5/4/28	14,944		14,849		14,925
Meritage Midstream Services II, LLC	(r)	Energy—Midstream	S+675	1.0%	8/13/28	21,759		21,361		22,409
Nephron Pharmaceuticals Corp.	(r)	Pharmaceuticals, Biotechnology & Life Sciences	S+900	1.5%	9/11/26	20,000		19,400		19,400
Parkway Generation LLC	(f)	Energy—Power	S+475	0.8%	2/18/29	5,760		5,712		5,761
Parkway Generation LLC	(f)	Energy—Power	S+475	0.8%	2/18/29	43,579		43,217		43,585
Permian Production Holdings, LLC	(r)(s)	Energy—Upstream	7.0%, 2.0% PIK (2.0% Max PIK)		11/23/25	4,840		4,437		4,840
Phoenix Guarantor Inc.	(f)(q)	Financial Services	S+350		3/5/26	9,974		9,971		9,940
Pinnacle Midland Gas Holdco LLC	(f)(r)	Energy—Midstream	S+675	1.0%	12/9/26	9,370		9,340		9,759
Plainfield Renewable Energy Holdings LLC	(m)(o)(r)	Energy—Power	6.0%, 9.5% PIK (9.5% Max PIK)		8/22/25	13,297		12,329		8,561
Plainfield Renewable Energy Holdings LLC	(m)(o)(r)	Energy—Power	10.0% PIK (10.0% Max PIK)		8/22/25	4,015		3,827		—

See notes to unaudited consolidated financial statements.

5

FS Specialty Lending Fund

Unaudited Consolidated Schedule of Investments (continued)

As of September 30, 2023

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Plainfield Renewable Energy Holdings LLC, Letter of Credit	(e)(r)	Energy—Power	10.0%		8/22/25	$	2,709	$	2,709	$	—
Potomac Energy Center, LLC	(f)(r)	Energy—Power	S+600	0.5%	11/12/26	57,869		57,133		53,702
Pro Mach Group, Inc.	(f)(q)	Capital Goods	S+400	1.0%	8/31/28	9,975		10,012		9,996
SRS Distribution Inc.	(f)	Capital Goods	S+350	0.5%	6/2/28	9,975		9,883		9,889
TKC Holdings, Inc.	(f)	Consumer Staples Distribution & Retail	S+550	1.0%	5/15/28	10,240		9,612		9,844
TruGreen, LP	(f)	Commercial & Professional Services	S+400	0.8%	11/2/27	9,962		9,245		9,493
Warren Resources, Inc.	(f)(r)(t)	Energy—Upstream	S+900, 1.0% PIK (1.0% Max PIK)	1.0%	5/22/24	23,763		23,763		23,763
Wattbridge Inc.	(f)(r)	Energy—Power	S+985	1.8%	6/30/27	42,938		42,938		41,839
Total Senior Secured Loans—First Lien								681,757		638,048
Unfunded Loan Commitments								(6,741)		(6,741)
Net Senior Secured Loans—First Lien								675,016		631,307
Senior Secured Loans—Second Lien—4.2%
Citizen Energy Operating, LLC	(f)(r)	Energy—Upstream	S+765	1.0%	6/29/27	36,000		35,513		35,377
SilverBow Resources, Inc.	(k)(r)	Energy—Upstream	S+750	1.0%	12/15/26	14,250		14,217		14,250
Tenrgys, LLC	(f)(r)	Energy—Upstream	S+750 (S+950 Max PIK)	1.0%	3/17/27	20,537		20,537		19,972
Total Senior Secured Loans—Second Lien								70,267		69,599
Senior Secured Bonds—2.0%
Guitar Center, Inc.	(f)(q)	Consumer Discretionary Distribution & Retail	8.5%		1/15/26	15,000		13,577		13,050
Navios Logistics Finance, Inc.	(f)(k)(q)	Transportation	10.8%		7/1/25	10,000		9,809		9,851
ST EIP Holdings Inc.	(f)(r)	Energy—Midstream	6.3%		1/10/30	10,419		9,999		9,780
Total Senior Secured Bonds								33,385		32,681
Unsecured Debt—6.6%
Aethon United BR LP		Energy—Upstream	8.3%		2/15/26	40,500		40,500		40,219
Hammerhead Resources Inc.	(k)(r)	Energy—Upstream	12.0% PIK (12.0% Max PIK)		7/15/24	39,458		39,366		39,459
Moss Creek Resources, LLC		Energy—Upstream	7.5%		1/15/26	11,693		10,635		11,340
Sitio Royalties Operating Partnership, LP	(f)(k)(r)	Energy—Upstream	S+575	1.5%	9/20/26	18,000		17,866		18,284
Total Unsecured Debt								108,367		109,302

See notes to unaudited consolidated financial statements.

6

FS Specialty Lending Fund

Unaudited Consolidated Schedule of Investments (continued)

As of September 30, 2023

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Number of Shares		Amortized Cost		Fair Value(d)
Preferred Equity—15.6%(l)
Abaco Energy Technologies LLC, Preferred Equity	(o)(r)	Energy—Service & Equipment				28,942,003		$	1,447	$	11,027
Global Jet Capital Holdings, LP, Preferred Equity	(o)(r)	Commercial & Professional Services				2,785,562		2,786		—
Global Jet Capital Holdings, LP, Preferred Equity	(m)(o)(r)	Commercial & Professional Services	9.0% PIK (9.0% Max PIK)		10/1/28	19,526		12,493		9,494
NGL Energy Partners, LP, Preferred Equity	(f)(k)(m)(o)(r)	Energy—Midstream	14.2%		7/2/27	156,250		157,633		139,911
USA Compression Partners, LP, Preferred Equity	(f)(k)(r)	Energy—Midstream	9.8%		4/3/28	79,336		78,091		98,773
Total Preferred Equity								252,450		259,205
Sustainable Infrastructure Investments, LLC—3.0%						Principal Amount(c)		Cost		Fair Value(d)
Sustainable Infrastructure Investments, LLC	(k)(o)(r)(t)	Energy—Power				$	60,603	$	54,514	$	49,192
Total Sustainable Infrastructure Investments, LLC								54,514		49,192
						Number of Shares		Amortized Cost		Fair Value(d)
Equity/Other—20.6%
Abaco Energy Technologies LLC, Common Equity	(o)(r)	Energy—Service & Equipment				6,944,444		$	6,944	$	1,521
AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00	(k)(o)(p)(r)	Energy—Power				35		2,652		187
AirSwift Holdings, Ltd., Common Equity	(k)(o)(r)	Commercial & Professional Services				3,750,000		6,029		3,075
Allied Wireline Services, LLC, Common Equity	(n)(o)(r)(t)	Energy—Service & Equipment				48,400		1,527		—
Allied Wireline Services, LLC, Warrants	(n)(o)(r)(t)	Energy—Service & Equipment				22,000		—		—
Arena Energy, LP, Contingent Value Rights	(r)	Energy—Upstream				126,632,117		351		472
Ascent Resources Utica Holdings, LLC, Common Equity	(n)(o)(r)	Energy—Upstream				1,486,929		44,700		41,357
GWP Midstream Holdco, LLC, Common Equity	(n)(o)(r)(s)	Energy—Midstream				105,785		6,681		1,413
Harvest Oil & Gas Corp., Common Equity	(o)(r)(s)	Energy—Upstream				135,062		14,418		675
Maverick Natural Resources, LLC, Common Equity	(n)(r)	Energy—Upstream				503,176		138,208		250,421
NGL Energy Partners, LP, Warrants (Par), Strike: $14.54	(k)(o)(r)	Energy—Midstream				2,187,500		3,083		695
NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45	(k)(o)(r)	Energy—Midstream				3,125,000		2,623		662
NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27	(k)(o)(r)	Energy—Midstream				781,250		576		173
NGL Energy Partners, LP, Warrants (Par), Strike:$13.56	(k)(o)(r)	Energy—Midstream				546,880		630		168
Permian Production Holdings, LLC, Common Equity	(n)(o)(r)(s)	Energy—Upstream				1,968,861		5		6,103
Telpico, LLC, Common Equity	(n)(o)(r)(s)	Energy—Upstream				50		—		—
Tenrgys, LLC, Common Equity	(n)(o)(r)	Energy—Upstream				50		7,571		4,790
USA Compression Partners, LP, Common Equity	(f)(k)	Energy—Midstream				84,779		1,617		2,023
USA Compression Partners, LP, Warrants (Premium), Strike: $19.59	(k)(o)(r)	Energy—Midstream				1,586,719		714		9,552
Warren Resources, Inc., Common Equity	(o)(r)(t)	Energy—Upstream				4,415,749		20,754		18,193

See notes to unaudited consolidated financial statements.

7

FS Specialty Lending Fund

Unaudited Consolidated Schedule of Investments (continued)

As of September 30, 2023

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Number of Shares	Amortized Cost		Fair Value(d)
Total Equity/Other							$	259,083	$	341,480
TOTAL INVESTMENTS—90.1%							$	1,453,082	1,492,766
OTHER ASSETS IN EXCESS OF LIABILITIES—9.9%	(j)								164,695
NET ASSETS—100.0%									$	1,657,461

Commodity Fixed Price Swaps—Crude Oil(i)

Counterparty	Settlement Index	Period	Bbls	Weighted Average Price ($/Bbls)	Unrealized Appreciation (Depreciation)(h)
BP Energy Co.	ICE Brent	October 1, 2023 – December 31, 2023	39,290	$80.00	$	(404)
Total Commodity Fixed Price Swaps—Crude Oil					$	(404)

Commodity Fixed Price Swaps—Natural Gas(i)

Counterparty	Settlement Index	Period	MMBtu	Weighted Average Price ($/MMBtu)	Unrealized Appreciation (Depreciation)(h)
BP Energy Co.	NYMEX Henry Hub	November 1, 2023 – December 31, 2023	52,626	$3.80	$	36
Total Commodity Fixed Price Swaps—Natural Gas					$	36
Total Commodity Fixed Price Swaps					$	(368)

__________________

Bbls – Barrels

MMBtu – One million British thermal units

Equity Total Return Swaps

Reference Entity	Counterparty	Interest Rate(b)	Maturity	Number of Shares	Notional		Unrealized Appreciation (Depreciation)(h)
FS Credit Opportunities Corp. Common Stock	Nomura Global Financial Products Inc.	OBFR+1.15%	September 21, 2026	547,479	$	2,897	$	70
Total Equity Total Return Swaps							$	70

__________________

(a)    Security may be an obligation of one or more entities affiliated with the named company.

(b)    Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023, the Secured Overnight Financing Rate, or SOFR, or S, was 5.40% and the Overnight Bank Funding Rate, or OBFR, was 5.32%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

(c)    Denominated in U.S. dollars, unless otherwise noted.

(d)    See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

(e)    Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

See notes to unaudited consolidated financial statements.

8

FS Specialty Lending Fund

Unaudited Consolidated Schedule of Investments (continued)

As of September 30, 2023

(in thousands, except share amounts)

(f)    Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).

(g)    Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

(h)    Represents the amounts the Company would pay or receive under each swap contract if it were to settle on September 30, 2023 (see Note 6).

(i)    Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

(j)    Includes the effect of swap contracts.

(k)    The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of September 30, 2023, 76.5% of the Company’s total assets represented qualifying assets.

(l)    Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.

(m)    Security was on non-accrual status as of September 30, 2023.

(n)    Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

(o)    Security is non-income producing.

(p)    Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

(q)    Security or portion thereof unsettled as of September 30, 2023.

(r)    Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

(s)    Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of September 30, 2023:

Portfolio Company	Fair Value at December 31, 2022		Gross Additions(1)		Gross Reductions(2)		Net Realized Gain (Loss)		Net Change in Unrealized Appreciation (Depreciation)		Fair Value at September 30, 2023		Interest Income(3)		PIK Income(3)
Senior Secured Loans—First Lien
Permian Production Holdings, LLC	$	4,767	$	171	$	—	$	—	$	(98)	$	4,840	$	398	$	73
Equity/Other
GWP Midstream Holdco, LLC, Common Equity	5,044		—		—		—		(3,631)		1,413		—		—
Harvest Oil & Gas Corp., Common Equity	810		—		(641)		—		506		675		—		—
Limetree Bay Energy, LLC, Class A Units	1,885		246		—		(21,704)		19,573		—		—		—
Permian Production Holdings, LLC, Common Equity	11,420		—		—		—		(5,317)		6,103		—		—
Ridgeback Resources Inc., Common Equity	41,851		—		(35,240)		(11,359)		4,748		—		—		—
Telpico, LLC, Common Equity	—		—		—		—		—		—		—		—
	$	65,777	$	417	$	(35,881)	$	(33,063)	$	15,781	$	13,031	$	398	$	73

_____________

(1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

(2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

(3)    Interest and PIK income presented for the nine months ended September 30, 2023.

See notes to unaudited consolidated financial statements.

9

FS Specialty Lending Fund

Unaudited Consolidated Schedule of Investments (continued)

As of September 30, 2023

(in thousands, except share amounts)

(t)    Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of September 30, 2023:

Portfolio Company	Fair Value at December 31, 2022		Gross Additions(1)		Gross Reductions(2)		Net Realized Gain (Loss)		Net Change in Unrealized Appreciation (Depreciation)		Fair Value at September 30, 2023		Interest Income(3)		PIK Income(3)
Senior Secured Loans—First Lien
Allied Downhole Technologies, LLC	$	8,436	$	138	$	(8,574)	$	—	$	—	$	—	$	256	$	139
Allied Wireline Services, LLC	63,888		6,389		—		—		(33,101)		37,176		2,910		—
Warren Resources, Inc.	23,584		23,882		(23,703)		—		—		23,763		2,521		179
Sustainable Infrastructure Investments, LLC
Sustainable Infrastructure Investments, LLC	51,098		—		—		—		(1,906)		49,192		—		—
Equity/Other
Allied Wireline Services, LLC, Common Equity	10,463		—		—		—		(10,463)		—		—		—
Allied Wireline Services, LLC, Warrants	—		—		—		—		—		—		—		—
Warren Resources, Inc., Common Equity	36,982		—		—		—		(18,789)		18,193		—		—
	$	194,451	$	30,409	$	(32,277)	$	—	$	(64,259)	$	128,324	$	5,687	$	318

_____________

(1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

(2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

(3)    Interest and PIK income presented for the nine months ended September 30, 2023.

See notes to unaudited consolidated financial statements.

10

FS Specialty Lending Fund

Consolidated Schedule of Investments

As of December 31, 2022

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Liens—40.3%
AIRRO (Mauritius) Holdings II	(k)(p)(s)	Power	L+400, 3.0% PIK (3.0% Max PIK)	1.5%	7/24/25	$	22,734	$	20,082	$	23,519
AIRRO (Mauritius) Holdings II	(e)(k)(p)(s)	Power	L+400, 3.0% PIK (3.0% Max PIK)	1.5%	7/24/25	5,359		5,359		5,545
Allied Downhole Technologies, LLC	(f)(s)(u)	Service & Equipment	8.0% PIK (8.0% Max PIK)		9/30/23	8,436		8,436		8,436
Allied Downhole Technologies, LLC	(e)(s)(u)	Service & Equipment	8.0% PIK (8.0% Max PIK)		9/30/23	2,500		2,500		2,500
Allied Wireline Services, LLC	(f)(s)(u)	Service & Equipment	10.0% PIK (10.0% Max PIK)		6/15/25	63,888		63,888		63,888
Brazos Delaware II LLC		Midstream	L+400		5/21/25	39,259		38,085		39,137
Cimarron Energy Inc.	(f)(m)(o)(s)	Service & Equipment	L+900	1.0%	12/31/24	7,500		6,563		3,713
Compass Power Generation LLC		Power	S+425	1.0%	4/14/29	31,575		30,712		31,384
Cox Oil Offshore, LLC, Volumetric Production Payments	(g)(i)(s)	Upstream	12.9%		12/31/23	100,000		11,081		20,683
CPV Maryland, LLC		Power	L+400	1.0%	5/11/28	14,286		14,146		14,155
CPV Shore Holdings LLC		Power	L+375		12/29/25	23,601		22,760		21,935
EIF Van Hook Holdings, LLC		Midstream	S+525		9/5/24	26,882		26,609		26,075
FR BR Holdings LLC	(f)(s)	Midstream	L+650		12/14/23	81,582		80,371		81,361
FR XIII PAA Holdings HoldCo, LLC	(s)	Midstream	L+750	0.5%	10/15/26	17,347		17,103		17,406
GasLog Ltd.	(k)(s)	Midstream	L+775		3/31/29	14,648		14,556		14,010
Generation Bridge LLC		Power	L+500	0.8%	12/1/28	7,432		7,305		7,385
Generation Bridge LLC		Power	L+500	0.8%	12/1/28	163		160		162
GIP II Blue Holding LP		Midstream	L+450	1.0%	9/29/28	5,918		5,842		5,877
Goodnight Water Solutions, LLC	(s)	Midstream	S+725	0.5%	6/3/27	14,963		14,752		14,819
Hamilton Intermediate Holdings, LLC	(s)	Power	16.5% PIK (16.5% Max PIK)		6/17/25	30,391		31,075		31,007
Medallion Midland Acquisition LP		Midstream	S+375	0.8%	10/18/28	7,920		7,886		7,862
OE2 North, LLC	(s)	Midstream	L+525	1.0%	5/21/26	18,659		18,579		18,847
OE2 North, LLC	(e)(s)	Midstream	L+525	1.0%	5/21/26	11,341		11,341		11,455
Oryx Midstream Services Permian Basin LLC	(f)	Midstream	L+325	0.5%	10/5/28	32,357		32,220		32,026
Parkway Generation LLC		Power	S+475	0.8%	2/18/29	5,760		5,708		5,700
Parkway Generation LLC		Power	S+475	0.8%	2/18/29	43,910		43,513		43,285
Permian Production Holdings, LLC	(f)(s)(t)	Upstream	7.0%, 2.0% PIK (2.0% Max PIK)		11/23/25	4,767		4,266		4,767
Pinnacle Midland Gas Holdco LLC	(s)	Midstream	L+675	1.0%	12/9/26	9,370		9,304		9,310
Pinnacle Midland Gas Holdco LLC	(e)(s)	Midstream	L+675	1.0%	12/9/26	2,477		2,477		2,461
Plainfield Renewable Energy Holdings LLC	(f)(s)	Power	6.0%, 9.5% PIK (9.5% Max PIK)		8/22/25	12,121		12,121		9,997
Plainfield Renewable Energy Holdings LLC	(f)(s)	Power	10.0% PIK (10.0% Max PIK)		8/22/25	3,643		3,643		—
Plainfield Renewable Energy Holdings LLC, Letter of Credit	(e)(s)	Power	10.0%		8/22/23	2,709		2,709		—
Potomac Energy Center, LLC	(s)	Power	L+600	0.5%	11/12/26	58,459		57,508		58,443

See notes to unaudited consolidated financial statements.

11

FS Specialty Lending Fund

Consolidated Schedule of Investments (continued)

As of December 31, 2022

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Traverse Midstream Partners LLC		Midstream	S+425	1.0%	9/27/24	$	28,436	$	28,484	$	28,418
Warren Resources, Inc.	(s)(u)	Upstream	L+900, 1.0% PIK (1.0% Max PIK)	1.0%	5/22/24	23,584		23,584		23,584
Wattbridge Inc.	(s)	Power	S+785	1.8%	6/30/27	42,500		42,500		41,880
Total Senior Secured Loans—First Lien								727,228		731,032
Unfunded Loan Commitments								(24,386)		(24,386)
Net Senior Secured Loans—First Lien								702,842		706,646
Senior Secured Loans—Second Lien—8.2%
Aethon III BR LLC	(f)(s)	Upstream	L+750	1.5%	1/10/25	20,000		19,848		20,138
Citizen Energy Operating, LLC	(f)(s)	Upstream	S+765	1.0%	6/29/27	39,000		38,440		38,240
ERA II Minerals, LLC	(f)(s)	Upstream	S+625	0.8%	3/7/27	37,000		36,601		36,656
Peak Exploration & Production, LLC	(f)(s)	Upstream	L+675	1.5%	11/16/23	13,545		13,528		13,394
Peak Exploration & Production, LLC	(e)(s)	Upstream	L+675	1.5%	11/16/23	1,505		1,505		1,488
SilverBow Resources, Inc.	(f)(k)(s)	Upstream	L+750	1.0%	12/15/26	14,250		14,199		14,322
Tenrgys, LLC	(f)(s)	Upstream	S+750 (9.5% Max PIK)	1.0%	3/17/27	20,537		20,537		20,537
Total Senior Secured Loans—Second Lien								144,658		144,775
Unfunded Loan Commitments								(1,505)		(1,505)
Net Senior Secured Loans—Second Lien								143,153		143,270
Senior Secured Bonds—0.6%
ST EIP Holdings Inc.	(s)	Midstream	6.3%		1/10/30	10,526		10,064		10,074
Total Senior Secured Bonds								10,064		10,074
Unsecured Debt—13.7%
Aethon United BR LP	(f)	Upstream	8.3%		2/15/26	40,500		40,500		40,221
Archrock Partners, L.P.	(f)(k)	Midstream	6.3%		4/1/28	3,098		3,168		2,840
Earthstone Energy Holdings, LLC	(k)	Upstream	8.0%		4/15/27	11,400		11,400		10,920
Endeavor Energy Resources, L.P.	(f)	Upstream	5.8%		1/30/28	24,299		25,388		23,306
Hammerhead Resources Inc.	(f)(k)(s)	Upstream	12.0% PIK (12.0% Max PIK)		7/15/24	35,118		34,961		35,118
Moss Creek Resources, LLC	(f)	Upstream	7.5%		1/15/26	11,693		10,358		10,561
NRG Energy, Inc.	(k)	Power	3.9%		2/15/32	19,125		18,668		14,401
Permian Resources Operating LLC		Upstream	7.8%		2/15/26	26,365		27,511		25,703
Permian Resources Operating LLC	(f)	Upstream	5.9%		7/1/29	5,200		5,257		4,473
Ranger Oil Corp.	(k)	Upstream	9.3%		8/15/26	29,772		29,633		29,678

See notes to unaudited consolidated financial statements.

12

FS Specialty Lending Fund

Consolidated Schedule of Investments (continued)

As of December 31, 2022

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Sitio Royalties Operating Partnership, LP	(f)(k)(s)	Upstream	S+650	1.5%	9/20/26	$	19,500	$	19,318	$	19,256
Suburban Propane Partners LP	(f)(k)	Midstream	5.0%		6/1/31	7,590		7,837		6,461
Tallgrass Energy Partners, LP	(f)	Midstream	6.0%		3/1/27	19,761		19,676		18,480
Total Unsecured Debt								253,675		241,418

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Number of Shares		Amortized Cost		Fair Value(d)
Preferred Equity—22.8%(l)
Abaco Energy Technologies LLC, Preferred Equity	(f)(o)(s)	Service & Equipment				28,942,003		$	1,447	$	8,321
Global Jet Capital Holdings, LP, Preferred Equity	(f)(o)(s)	Commercial & Professional Services				2,785,562		2,786		—
Global Jet Capital Holdings, LP, Preferred Equity	(f)(m)(o)(s)	Commercial & Professional Services	9.0% PIK (9.0% Max PIK)		10/1/28	18,296		12,493		9,377
NGL Energy Partners, LP, Preferred Equity	(f)(k)(m)(o)(s)	Midstream	14.2%		7/2/27	156,250		157,633		125,000
NuStar, Preferred Equity	(f)(k)(s)	Midstream	12.8%		6/29/28	2,640,311		73,114		83,590
Segreto Power Holdings, LLC, Preferred Equity	(f)(m)(n)(o)(s)	Power	13.1%		6/30/25	70,297		99,766		83,647
USA Compression Partners, LP, Preferred Equity	(k)(s)	Midstream	9.8%		4/3/28	79,336		77,943		90,479
Total Preferred Equity								425,182		400,414
						Principal Amount(c)		Cost		Fair Value(d)
Sustainable Infrastructure Investments, LLC—2.9%
Sustainable Infrastructure Investments, LLC	(k)(s)(u)	Power				$	60,603	$	54,514	$	51,098
Total Sustainable Infrastructure Investments, LLC								54,514		51,098
						Number of Shares		Amortized Cost		Fair Value(d)
Equity/Other—28.2%
Abaco Energy Technologies LLC, Common Equity	(f)(o)(s)	Service & Equipment				6,944,444		$	6,944	$	1,219
AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00	(f)(k)(o)(p)(s)	Power			7/24/25	35		2,652		1,630
Allied Wireline Services, LLC, Common Equity	(f)(n)(o)(s)(u)	Service & Equipment				48,400		1,527		10,463
Allied Wireline Services, LLC, Warrants	(f)(n)(o)(s)(u)	Service & Equipment				22,000		—		—
Arena Energy, LP, Contingent Value Rights	(f)(o)(s)	Upstream			2/1/25	126,632,117		351		858
Ascent Resources Utica Holdings, LLC, Common Equity	(f)(n)(o)(s)	Upstream				148,692,948		44,700		52,340
Cimarron Energy Holdco Inc., Common Equity	(f)(o)(s)	Service & Equipment				4,302,293		3,950		—
Cimarron Energy Holdco Inc., Participation Option	(f)(o)(s)	Service & Equipment				25,000,000		1,289		—
GWP Midstream Holdco, LLC, Common Equity	(f)(n)(o)(s)(t)	Midstream				105,785		6,681		5,044
Harvest Oil & Gas Corp., Common Equity	(f)(o)(t)	Upstream				135,062		15,059		810

See notes to unaudited consolidated financial statements.

13

FS Specialty Lending Fund

Consolidated Schedule of Investments (continued)

As of December 31, 2022

(in thousands, except share amounts)

Portfolio Company(a)	Footnotes	Industry	Rate(b)	Floor(b)	Maturity	Number of Shares	Amortized Cost		Fair Value(d)
Limetree Bay Energy, LLC, Class A Units	(f)(o)(s)(t)	Midstream				76,938,973	$	21,458	$	1,885
Maverick Natural Resources, LLC, Common Equity	(f)(n)(s)	Upstream				503,176	138,208		312,372
MB Precision Investment Holdings LLC, Class A-2 Units	(f)(n)(o)(s)	Industrials				1,426,110	490		—
NGL Energy Partners, LP, Warrants (Par), Strike: $14.54	(f)(k)(o)(s)	Midstream			12/31/25	2,187,500	3,083		10
NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45	(f)(k)(o)(s)	Midstream			12/31/25	3,125,000	2,623		8
NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27	(f)(k)(o)(s)	Midstream			12/31/25	781,250	576		2
NGL Energy Partners, LP, Warrants (Par), Strike: $13.56	(f)(k)(o)(s)	Midstream			12/31/25	546,880	630		3
Permian Production Holdings, LLC, Common Equity	(f)(n)(s)(t)	Upstream				1,968,861	5		11,420
Ridgeback Resources Inc., Common Equity	(f)(k)(q)(s)(t)	Upstream				9,599,928	46,599		41,851
Swift Worldwide Resources Holdco Limited, Common Equity	(f)(k)(o)(r)(s)	Commercial & Professional Services				3,750,000	6,029		3,131
Telpico, LLC, Common Equity	(f)(n)(o)(s)(t)	Upstream				50	—		—
Tenrgys, LLC, Common Equity	(f)(n)(o)(s)	Upstream				50	7,571		6,801
USA Compression Partners, LP, Common Equity	(f)(k)(o)	Midstream				84,779	1,617		1,655
USA Compression Partners, LP, Warrants (Premium), Strike: $19.59	(f)(k)(o)(s)	Midstream			4/2/28	1,586,719	714		5,711
Warren Resources, Inc., Common Equity	(f)(o)(s)(u)	Upstream				4,415,749	20,754		36,982
Total Equity/Other							333,510		494,195
TOTAL INVESTMENTS—116.7%							$	1,922,940	2,047,115
LIABILITIES IN EXCESS OF OTHER ASSETS—(16.7%)	(j)								(293,367)
NET ASSETS—100.0%									$	1,753,748

Fixed Price Swap Contracts—Crude Oil(i)

Counterparty	Type	Settlement Index	Period	Bbls	Weighted Average Price ($/Bbls)	Unrealized Appreciation(h)		Unrealized Depreciation(h)
BP Energy Co.	Fixed	ICE Brent	January 1, 2023 – December 31, 2023	168,511	$80.00	$	—	$	572
Total Swap Contracts—Crude Oil						$	—	$	572

Fixed Price Swap Contracts—Natural Gas(i)

Counterparty	Type	Settlement Index	Period	MMBtu	Weighted Average Price ($/MMBtu)	Unrealized Appreciation(h)		Unrealized Depreciation(h)
BP Energy Co.	Fixed	NYMEX Henry Hub	February 1, 2023 – December 31, 2023	314,818	$3.80	$	—	$	126
Total Swap Contracts—Natural Gas						$	—	$	126
TOTAL SWAP CONTRACTS						$	—	$	698

__________________

Bbls – Barrels

MMBtu – One million British thermal units

See notes to unaudited consolidated financial statements.

14

FS Specialty Lending Fund

Consolidated Schedule of Investments (continued)

As of December 31, 2022

(in thousands, except share amounts)

__________________

(a)    Security may be an obligation of one or more entities affiliated with the named company.

(b)    Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2022, the three-month London Interbank Offered Rate, or LIBOR, or L, was 4.77% and the Secured Overnight Financing Rate, or SOFR, or S, was 4.59%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

(c)    Denominated in U.S. dollars, unless otherwise noted.

(d)    See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

(e)    Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

(f)    Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).

(g)    Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

(h)    Represents the amounts the Company would pay or receive under each swap contract if it were to settle on December 31, 2022 (see Note 6).

(i)    Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

(j)    Includes the effect of swap contracts.

(k)    The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.

(l)    Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.

(m)    Security was on non-accrual status as of December 31, 2022.

(n)    Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

(o)    Security is non-income producing.

(p)    Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

(q)    Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

(r)    Investment denominated in British pounds. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

(s)    Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

See notes to unaudited consolidated financial statements.

15

FS Specialty Lending Fund

Consolidated Schedule of Investments (continued)

As of December 31, 2022

(in thousands, except share amounts)

(t)    Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of December 31, 2022:

Portfolio Company	Fair Value at December 31, 2021		Gross Additions(1)		Gross Reductions(2)		Net Realized Gain (Loss)		Net Change in Unrealized Appreciation (Depreciation)		Fair Value at December 31, 2022		Interest Income(3)		PIK Income(3)		Fee Income(3)		Dividend Income(3)
Senior Secured Loans—First Lien
Limetree Bay Energy, LLC	$	3,166	$	—	$	(1,587)	$	(12,756)	$	11,177	$	—	$	—	$	—	$	—	$	—
Permian Production Holdings, LLC	7,889		697		(3,674)		551		(696)		4,767		570		105		—		—
Senior Secured Bonds
Great Western Petroleum, LLC	58,055		96		(55,096)		1,087		(4,142)		—		2,649		—		7,268		—
Equity/Other
Great Western Petroleum, LLC, Common Equity	40,731		—		(84,871)		54,081		(9,941)		—		—		—		—		—
GWP Midstream Holdco, LLC, Common Equity	—		6,681		—		—		(1,637)		5,044		—		—		—		—
Harvest Oil & Gas Corp., Common Equity	2,836		—		(743)		—		(1,283)		810		—		—		—		—
Limetree Bay Energy, LLC, Class A Units	6,046		1,795		—		—		(5,956)		1,885		—		—		—		—
Permian Production Holdings, LLC, Common Equity	8,829		4		—		—		2,587		11,420		—		—		—		1,726
Ridgeback Resources Inc., Common Equity	48,356		—		(12,559)		173		5,881		41,851		—		—		—		3,691
Telpico, LLC, Common Equity	—		—		—		—		—		—		—		—		—		—
	$	175,908	$	9,273	$	(158,530)	$	43,136	$	(4,010)	$	65,777	$	3,219	$	105	$	7,268	$	5,417

_____________

(1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

(2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

(3)    Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

See notes to unaudited consolidated financial statements.

16

FS Specialty Lending Fund

Consolidated Schedule of Investments (continued)

As of December 31, 2022

(in thousands, except share amounts)

(u)    Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of December 31, 2022:

Portfolio Company	Fair Value at December 31, 2021		Gross Additions(1)		Gross Reductions(2)		Net Realized Gain (Loss)		Net Change in Unrealized Appreciation (Depreciation)		Fair Value at December 31, 2022		Interest Income(3)		PIK Income(3)		Dividend Income(3)
Senior Secured Loans—First Lien
Allied Downhole Technologies, LLC(4)	$	7,782	$	654	$	—	$	—	$	—	$	8,436	$	—	$	654	$	—
Allied Wireline Services, LLC	46,339		5,808		—		—		11,741		63,888		316		5,808		—
MECO IV Holdco, LLC	22,745		455		(23,200)		—		—		—		—		455		—
Warren Resources, Inc.	23,688		237		(341)		—		—		23,584		2,620		237		—
Sustainable Infrastructure Investments, LLC
Sustainable Infrastructure Investments, LLC	50,770		—		—		—		328		51,098		—		—		735
Equity/Other
Allied Wireline Services, LLC, Common Equity	—		—		—		—		10,463		10,463		—		—		—
Allied Wireline Services, LLC, Warrants	—		—		—		—		—		—		—		—		—
MECO IV Holdco, LLC, Class A-1 Units	4,181		—		(18,060)		15,899		(2,020)		—		—		—		—
Warren Resources, Inc., Common Equity	25,854		—		—		—		11,128		36,982		—		—		—
	$	181,359	$	7,154	$	(41,601)	$	15,899	$	31,640	$	194,451	$	2,936	$	7,154	$	735

_____________

(1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

(2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

(3)    Interest, PIK and dividend income presented for the year ended December 31, 2022.

(4)    Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

See notes to unaudited consolidated financial statements.

17

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements

(in thousands, except share and per share amounts)

Note 1. Principal Business and Organization

FS Specialty Lending Fund, or the Company, was formed as a Delaware statutory trust under the Delaware Statutory Trust Act on September 16, 2010 and formally commenced investment operations on July 18, 2011. Prior to September 29, 2023, the Company’s name was FS Energy and Power Fund. The Company is an externally managed, non-diversified, closed-end management investment company that has elected to be regulated as a business development company, or BDC, under the Investment Company Act of 1940, as amended, or the 1940 Act. In addition, the Company has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a regulated investment company, or RIC, as defined under Subchapter M of the Internal Revenue Code of 1986, as amended, or the Code. The Company has various wholly-owned financing subsidiaries, including special-purpose financing subsidiaries and subsidiaries through which it holds or expects to hold interests in certain portfolio companies. The unaudited consolidated financial statements include both the Company’s accounts and the accounts of its wholly-owned subsidiaries as of September 30, 2023. All significant intercompany transactions have been eliminated in consolidation. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes.

On May 15, 2023, the Company announced that its board of trustees approved the Company’s transition from an investment policy of investing primarily in energy companies to a diversified credit investment policy of investing across private and public credit in a broader set of industries, sectors and sub-sectors. The Company notified its shareholders of the new policy, which became effective on September 29, 2023.

The Company’s current investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation by investing primarily in private and public credit in a broad set of industries, sectors and sub-sectors. The Company’s current investment policy is to invest primarily in a portfolio of secured and unsecured floating and fixed rate loans, bonds and other types of credit instruments, which, under normal circumstances, will represent at least 80% of the Company’s total assets.

Prior to September 29, 2023, the Company’s investment objectives were to generate current income and long-term capital appreciation by investing primarily in privately-held U.S. companies in the energy and power industry. Prior to September 29, 2023, the Company’s investment policy was to invest, under normal circumstances, at least 80% of its total assets in securities of energy and power related, or Energy, companies. The Company considers Energy companies to be those companies that engage in the exploration, development, production, gathering, transportation, processing, storage, refining, distribution, mining, generation or marketing of natural gas, natural gas liquids, crude oil, refined products, coal or power, including those companies that provide equipment or services to companies engaged in any of the foregoing.

The Company commenced transitioning the Company’s portfolio holdings away from Energy investments in May 2023, while remaining in compliance with the Company’s then-current investment policy. The Company’s allocation to Energy investments is expected to decline over time through the natural course of maturities, repayments and sales activity and by growing the total size of the portfolio through leverage facilities. The pace of the portfolio rotation is dependent upon a number of factors, including the turnover of concentrated illiquid Energy investments, performance of underlying portfolio companies, high yield and energy market conditions, the Company’s access to borrowings and the amount and pace of the payment of enhanced distributions to shareholders, among others.

The Company is managed by FS/EIG Advisor, LLC, or FS/EIG Advisor, pursuant to an investment advisory and administrative services agreement, dated as of April 9, 2018, or the FS/EIG investment advisory agreement. FS/EIG Advisor oversees the management of the Company’s operations and is responsible for making investment decisions with respect to the Company’s portfolio. FS/EIG Advisor is jointly operated by an affiliate of Franklin Square Holdings, L.P. (which does business as FS Investments) and EIG Asset Management, LLC, or EIG.

Note 2. Summary of Significant Accounting Policies

Basis of Presentation: The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP, for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. For a more complete discussion of significant accounting policies and certain other information, the Company’s interim unaudited consolidated financial statements should be read in conjunction with its audited consolidated financial statements as of and for the year ended December 31, 2022 included in the Company’s annual report on Form 10-K. Operating results for the nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023. The December 31, 2022 consolidated balance sheet and consolidated schedule of investments are derived from the Company's audited consolidated financial statements as of and for the year ended December 31, 2022. The Company is considered an investment company under GAAP and follows the accounting and reporting guidance applicable to investment companies under Accounting Standards Codification Topic 946, Financial Services—

18

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 2. Summary of Significant Accounting Policies (continued)

Investment Companies. The Company has evaluated the impact of subsequent events through the date the unaudited consolidated financial statements were issued and filed with the Securities and Exchange Commission, or the SEC.

Use of Estimates: The preparation of the unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Many of the amounts have been rounded, and all amounts are in thousands, except share and per share amounts.

Capital Gains Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, the incentive fee on capital gains is determined and payable in arrears as of the end of each calendar year (or upon termination of such agreement). Such fee equals 20.0% of the Company’s “incentive fee capital gains,” which are the Company’s realized capital gains on a cumulative basis from inception, calculated as of the end of the applicable period, computed net of all realized capital losses and unrealized capital depreciation on a cumulative basis, less the aggregate amount of any previously paid incentive fees on capital gains. The Company will accrue for the incentive fee on capital gains, which, if earned, will be paid annually. The Company will accrue the incentive fee on capital gains based on net realized and unrealized gains; however, the fee payable to FS/EIG Advisor will be based on realized gains and no such fee will be payable with respect to unrealized gains unless and until such gains are actually realized. For the nine months ended September 30, 2023 and 2022, the Company did not accrue any amount of capital gains incentive fee.

Subordinated Income Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, FS/EIG Advisor may also be entitled to receive a subordinated incentive fee on income. The subordinated incentive fee on income under the FS/EIG investment advisory agreement is calculated and payable quarterly in arrears and equals 20.0% of the Company’s “pre-incentive fee net investment income” for the immediately preceding quarter subject to a hurdle rate, expressed as a rate of return on adjusted capital, equal to 1.625% per quarter, or an annualized hurdle rate of 6.5%. As a result, FS/EIG Advisor will not earn this incentive fee for any quarter until the Company’s pre-incentive fee net investment income for such quarter exceeds the hurdle rate of 1.625%. For purposes of this fee, “adjusted capital” means cumulative gross proceeds generated from sales of the Company’s common shares (including proceeds from its distribution reinvestment plan) reduced for distributions from non-liquidating dispositions of the Company’s investments paid to shareholders and amounts paid for share repurchases pursuant to the Company’s share repurchase program. Once the Company’s pre-incentive fee net investment income in any quarter exceeds the hurdle rate, FS/EIG Advisor will be entitled to a “catch-up” fee equal to the amount of the Company’s pre-incentive fee net investment income in excess of the hurdle rate, until the Company’s pre-incentive fee net investment income for such quarter equals 2.031%, or 8.125% annually, of adjusted capital. This “catch-up” feature will allow FS/EIG Advisor to recoup the fees foregone as a result of the existence of the hurdle rate. Thereafter, FS/EIG Advisor will be entitled to receive 20.0% of the Company’s pre-incentive fee net investment income. For the nine months ended September 30, 2023 and 2022, the Company did not accrue any amount of subordinated incentive fee on income.

Reclassifications: Certain amounts in the unaudited consolidated financial statements for the nine months ended September 30, 2022 may have been reclassified to conform to the classifications used to prepare the unaudited consolidated financial statements for the nine months ended September 30, 2023.

Revenue Recognition: Security transactions are accounted for on the trade date. The Company records interest income on an accrual basis to the extent that it expects to collect such amounts. The Company records dividend income on the ex-dividend date. Distributions received from limited liability company, or LLC, and limited partnership, or LP, investments are evaluated to determine if the distribution should be recorded as dividend income or a return of capital. The Company does not accrue as a receivable interest or dividends on loans and securities if it has reason to doubt its ability to collect such income. The Company’s policy is to place investments on non-accrual status when there is reasonable doubt that interest income will be collected. The Company considers many factors relevant to an investment when placing it on or removing it from non-accrual status including, but not limited to, the delinquency status of the investment, economic and business conditions, the overall financial condition of the underlying investment, the value of the underlying collateral, bankruptcy status, if any, and any other facts or circumstances relevant to the investment. If there is reasonable doubt that the Company will receive any previously accrued interest, then the accrued interest will be written-off. Payments received on non-accrual investments may be recognized as income or applied to principal depending upon the collectability of the remaining principal and interest. Non-accrual investments may be restored to accrual status when principal and interest become current and are likely to remain current based on the Company’s judgment.

Loan origination fees, original issue discount and market discount are capitalized and the Company amortizes such amounts as interest income over the respective term of the loan or security. Upon the prepayment of a loan or security, any unamortized loan origination fees and original issue discount are recorded as interest income. Structuring and other non-recurring upfront fees are recorded as fee income when earned. The Company records prepayment premiums on loans and securities as fee income when it earns such amounts. For the nine months ended September 30, 2023 and 2022, the Company recognized $591 and $0, respectively, in structuring or other upfront fee revenue.

19

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 2. Summary of Significant Accounting Policies (continued)

Net Realized Gains or Realized Losses on Extinguishment of Debt: Upon the repayment of debt obligations which are deemed to be extinguishments, the difference between the principal amount due at maturity and the amount repaid on the extinguishment of debt is recognized as a gain or loss.

Derivative Instruments: The Company’s derivative instruments may include fixed price swaps and equity total return swaps. The Company recognizes all derivative instruments as assets or liabilities at fair value in its consolidated financial statements. Derivative contracts entered into by the Company are not designated as hedging instruments for accounting purposes, and as a result, the Company presents changes in fair value through net change in unrealized appreciation (depreciation) on swap contracts in the consolidated statements of operations. Realized gains and losses of the derivative instruments are included in net realized gain (loss) on swap contracts in the consolidated statements of operations.

Recent Accounting Pronouncements: In March 2020, the FASB issued Accounting Standards Update No. 2020-04, Reference Rate Reform (Topic 848), or ASU 2020-04, which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. In January 2021, the FASB issued Accounting Standards Update No. 2021-01, Reference Rate Reform (Topic 848), or ASU 2021-01, which expanded the scope of Topic 848 to include derivative instruments impacted by discounting transition. ASU 2020-04 and ASU 2021-01 are effective for all entities through December 31, 2022. The expedients and exceptions provided by the amendments do not apply to contract modifications and hedging relationships entered into or evaluated after December 31, 2022, except for hedging transactions as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. In December 2022, the FASB issued Accounting Standards Update No. 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, or ASU 2022-06, which deferred the sunset date of this guidance to December 31, 2024. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

Note 3. Share Transactions

Below is a summary of transactions with respect to the Company’s common shares during the nine months ended September 30, 2023 and 2022:

	Nine Months Ended September 30,
	2023			2022
	Shares	Amount		Shares	Amount
Reinvestment of Distributions(1)	4,040,561	$	15,549	4,040,233	$	15,651
Proceeds from Share Transactions	4,040,561	$	15,549	4,040,233	$	15,651

______________

(1)    On September 15, 2023, the Company's second amended and restated distribution reinvestment plan terminated.

On July 19, 2023, the Company’s board of trustees, including the independent trustees, approved the termination of the Company’s second amended and restated distribution reinvestment plan with respect to distributions declared by the Company’s board of trustees on the Company’s common shares, effective as of September 15, 2023. After this date, all shareholders will receive any subsequent distributions in cash.

On February 25, 2020, the Company received exemptive relief from the SEC permitting it to offer multiple classes of common shares. While the Company has no present intention to recommence a public offering of its common shares, the Company could do so in the future.

Share Repurchase Program

In March 2020, in light of difficult market conditions and in an effort to preserve liquidity in the Company, the Company’s board of trustees determined to suspend for an indefinite period of time the Company’s share repurchase program and will reassess the Company’s ability to recommence such program in future periods.

Prior to its suspension, the Company intended to conduct quarterly tender offers pursuant to its share repurchase program. The Company's board of trustees will consider the following factors, among others, in making its determination regarding whether to cause the Company to offer to repurchase common shares and under what terms:

•    the effect of such repurchases on the Company’s qualification as a RIC (including the consequences of any necessary asset sales);

20

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 3. Share Transactions (continued)

•    the liquidity of the Company's assets (including fees and costs associated with disposing of assets);

•    the Company’s investment plans and working capital requirements;

•    the relative economies of scale with respect to the Company’s size;

•    the Company’s history in repurchasing common shares or portions thereof; and

•    the condition of the securities markets.

Historically, the Company limited the number of common shares to be repurchased during any calendar year to the lesser of (i) the number of common shares the Company can repurchase with the proceeds it receives from the issuance of common shares under the Company’s distribution reinvestment plan and (ii) 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter. On May 5, 2017, the board of trustees of the Company further amended the share repurchase program. As amended, the Company limited the maximum number of common shares to be repurchased for any repurchase offer to the greater of (A) the number of common shares that the Company can repurchase with the proceeds it has received from the sale of common shares under its distribution reinvestment plan during the twelve-month period ending on the date the applicable repurchase offer expires (less the amount of proceeds used to repurchase common shares on each previous repurchase date for repurchase offers conducted during such twelve-month period) (this limitation is referred to as the twelve-month repurchase limitation) and (B) the number of common shares that the Company can repurchase with the proceeds the Company receives from the sale of common shares under its distribution reinvestment plan during the three-month period ending on the date the applicable repurchase offer expires (this limitation is referred to as the three-month repurchase limitation). In addition to this limitation, the maximum number of common shares to be repurchased for any repurchase offer has also been limited to 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter. As a result, the maximum number of common shares to be repurchased for any repurchase offer would not exceed the lesser of (i) 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter, and (ii) whichever is greater of the twelve-month repurchase limitation described in clause (A) above and the three-month repurchase limitation described in clause (B) above.

Historically, pursuant to the Company's share repurchase program, the Company offered to repurchase common shares at a price equal to the price at which common shares were issued pursuant to the Company’s distribution reinvestment plan on the distribution date coinciding with the applicable share repurchase date. The price at which common shares were issued under the Company’s distribution reinvestment plan was determined by the Company’s board of trustees or a committee thereof, in its sole discretion, and was (i) not less than the net asset value per common share as determined in good faith by the Company’s board of trustees or a committee thereof, in its sole discretion, immediately prior to the payment date of the distribution and (ii) not more than 2.5% greater than the net asset value per common share as of such date. The Company’s board of trustees may amend, suspend or terminate the share repurchase program at any time, upon 30 days’ notice. The Company did not repurchase any shares pursuant to its share repurchase program during the nine months ended September 30, 2023 and 2022. The Company's distribution reinvestment plan was terminated effective September 15, 2023.

In order to minimize the expense of supporting small accounts and provide additional liquidity to shareholders of the Company holding small accounts after completion of a regular quarterly share repurchase offer, the Company reserves the right to repurchase the shares of and liquidate any investor’s account if the balance of such account is less than the Company’s $5 minimum initial investment, unless the account balance has fallen below the minimum solely as a result of a decline in the Company’s net asset value per share. The Company will provide or will cause to be provided 30 days’ prior written notice to potentially affected investors, which notice may be included in regular quarterly repurchase offer materials, of any such repurchase. Historically, any such repurchases were made at the Company’s most recent price at which the Company’s shares were issued pursuant to its distribution reinvestment plan. There were no de minimis account liquidations during the nine months ended September 30, 2023 and 2022.

Note 4. Related Party Transactions

Compensation of the Investment Adviser

Pursuant to the FS/EIG investment advisory agreement, FS/EIG Advisor is entitled to an annual base management fee based on the average weekly value of the Company’s gross assets (gross assets equals total assets as set forth on the Company’s consolidated balance sheets) during the most recently completed calendar quarter and an incentive fee based on the Company’s performance. The base management fee is payable quarterly in arrears, and is calculated at an annual rate of 1.75% of the average weekly value of the Company’s gross assets. See Note 2 for a discussion of the capital gains and subordinated income incentive fees that FS/EIG Advisor may be entitled to under the FS/EIG investment advisory agreement.

21

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 4. Related Party Transactions (continued)

FS/EIG Advisor may receive structuring or other upfront fees from portfolio companies in which FS/EIG Advisor has caused the Company to invest. FS/EIG Advisor has agreed to offset the amount of any structuring, upfront or certain other fees received by FS/EIG Advisor or its members against the management fees payable by the Company under the FS/EIG investment advisory agreement. During the nine months ended September 30, 2023 and 2022, $337 and $2,606, respectively, of structuring, upfront or certain other fees received by FS/EIG Advisor or its members were offset against management fees.

Pursuant to the FS/EIG investment advisory agreement, FS/EIG Advisor oversees the Company’s day-to-day operations, including the provision of general ledger accounting, fund accounting, legal services, investor relations, certain government and regulatory affairs activities and other administrative services. FS/EIG Advisor also performs, or oversees the performance of, the Company’s corporate operations and required administrative services, which includes being responsible for the financial records that the Company is required to maintain and preparing reports for the Company’s shareholders and reports filed with the SEC.

The Company reimburses FS/EIG Advisor for expenses necessary to perform services related to the Company’s administration and operations, including FS/EIG Advisor’s allocable portion of the compensation and/or related expenses of certain personnel of FS Investments and EIG providing administrative services to the Company on behalf of FS/EIG Advisor, and for transactional expenses for prospective investments, such as fees and expenses associated with performing due diligence reviews of investments that do not close, often referred to as “broken deal” costs. The Company reimburses FS/EIG Advisor no less than quarterly for expenses necessary to perform services related to the Company’s administration and operations. The amount of this reimbursement is set at the lesser of (1) FS/EIG Advisor’s actual costs incurred in providing such services and (2) the amount that the Company estimates it would be required to pay alternative service providers for comparable services in the same geographic location. FS/EIG Advisor allocates the cost of such services to the Company based on factors such as time allocations and other reasonable metrics. The Company’s board of trustees reviews the methodology employed in determining how the expenses are allocated to the Company and assesses the reasonableness of such reimbursements for expenses allocated to the Company based on the breadth, depth and quality of such services as compared to the estimated cost to the Company of obtaining similar services from third-party providers known to be available. In addition, the Company’s board of trustees considers whether any single third-party service provider would be capable of providing all such services at comparable cost and quality. Finally, the Company’s board of trustees, among other things, compares the total amount paid to FS/EIG Advisor for such services as a percentage of the Company’s net assets to the same ratio as reported by other comparable BDCs. The Company does not reimburse FS/EIG Advisor for any services for which it receives a separate fee, or for rent, depreciation, utilities, capital equipment or other administrative items allocated to a controlling person of FS/EIG Advisor.

The following table describes the fees and expenses accrued under the FS/EIG investment advisory agreement during the three and nine months ended September 30, 2023 and 2022:

			Three Months Ended September 30,				Nine Months Ended September 30,
Related Party	Source Agreement	Description	2023		2022		2023		2022
FS/EIG Advisor	FS/EIG investment advisory agreement	Base Management Fee(1)	$	7,715	$	11,142	$	26,620	$	30,755
FS/EIG Advisor	FS/EIG investment advisory agreement	Administrative Services Expenses(2)	$	1,887	$	1,695	$	4,566	$	4,605

_________________________

(1)    During the nine months ended September 30, 2023 and 2022, $30,090 and $30,079, respectively, in base management fees were paid to FS/EIG Advisor. The base management fee amount shown in the table above is shown net of $63 and $208 in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees for the three months ended September 30, 2023 and 2022, respectively, and $337 and $2,606 in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees for the nine months ended September 30, 2023 and 2022, respectively. As of September 30, 2023, $7,715 in base management fees were payable to FS/EIG Advisor.

(2)    During the nine months ended September 30, 2023 and 2022, $2,386 and $1,999, respectively, of the accrued administrative services expenses related to the allocation of costs of administrative personnel for services rendered to the Company by FS/EIG Advisor and the remainder related to other reimbursable expenses. The Company paid $4,017 and $3,284 in administrative services expenses to FS/EIG Advisor, or its affiliates, during the nine months ended September 30, 2023 and 2022, respectively.

22

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 4. Related Party Transactions (continued)

Potential Conflicts of Interest

The members of the senior management and investment teams of FS/EIG Advisor serve or may serve as officers, directors or principals of entities that operate in the same or a related line of business as the Company does, or of investment vehicles managed by the same personnel. The officers, managers and other personnel of FS/EIG Advisor may serve in similar or other capacities for the investment advisers to future investment vehicles affiliated with FS Investments or EIG. In serving in these multiple and other capacities, they may have obligations to other clients or investors in those entities, the fulfillment of which may not be in the Company’s best interests or in the best interest of the Company’s shareholders. The Company’s investment objectives may overlap with the investment objectives of such investment funds, accounts or other investment vehicles. For additional information regarding potential conflicts of interest, see the Company’s annual report on Form 10-K for the year ended December 31, 2022.

Exemptive Relief

As a BDC, the Company is subject to certain regulatory restrictions in making its investments. For example, BDCs generally are not permitted to co-invest with certain affiliated entities in transactions originated by the BDC or its affiliates in the absence of an exemptive order from the SEC. However, BDCs are permitted to, and may, simultaneously co-invest in transactions where price is the only negotiated term. In an order dated June 4, 2013, or the Order, the SEC granted exemptive relief permitting the Company, subject to the satisfaction of certain conditions, to co-invest in certain privately negotiated investment transactions with certain affiliates of its former investment adviser, including FS KKR Capital Corp., or collectively the Company’s co-investment affiliates. Effective April 9, 2018, or the JV Effective Date, and in connection with the transition of advisory services to a joint advisory relationship with EIG, the Company’s board of trustees authorized and directed that the Company (i) withdraw from the Order, except with respect to any transaction in which the Company participated in reliance on the Order prior to the JV Effective Date, and (ii) rely on an exemptive relief order dated April 10, 2018, granted to EIG and its affiliates which permits the Company to participate in co-investment transactions with certain other EIG advised funds, or the EIG Order. On September 19, 2023, the Company, among other applicants, filed an application with the SEC to seek permission to co-invest in certain privately negotiated transactions with certain affiliates of FS/EIG Advisor, including FS Credit Opportunities Corp. and FS Tactical Opportunities Fund. The application provides that, among other things, should the SEC grant the requested order, the Company would withdraw from the EIG Order, except with respect to any transaction in which the Company participated in reliance on the EIG Order prior to the issuance of the new order.

Note 5. Distributions

The following table reflects the cash distributions per share that the Company declared on its common shares during the nine months ended September 30, 2023 and 2022:

	Distribution
For the Three Months Ended	Per Share		Amount
Fiscal 2022
March 31, 2022	$	0.03	$	13,426
June 30, 2022	0.03		13,465
September 30, 2022	0.03		13,504
Total	$	0.09	$	40,395
Fiscal 2023
March 31, 2023	$	0.03	$	13,584
June 30, 2023	0.03		13,624
September 30, 2023	—		—
Total	$	0.06	$	27,208

The Company expects to provide enhanced quarterly distributions to shareholders. On October 18, 2023, the Company’s board of trustees declared the initial enhanced cash distribution of $0.0683 per share for the third quarter of 2023, which represents an annualized distribution rate of approximately 7.5% based on the Company’s estimated net asset value as of September 30, 2023. The enhanced distributions are expected to be paid quarterly and increase in subsequent years until the achievement of a long-term liquidity event, subject to a maximum cap of 15% of the Company’s then-current estimated net asset value beyond 2026. The Company expects a portion of the distributions may represent a return of investor capital, helping to accelerate liquidity for shareholders in the near-term. There can be no assurance that the Company will be able to pay distributions in the future. The timing and amount of any future distributions to shareholders are subject to applicable legal restrictions and the sole discretion of the Company’s board of trustees.

23

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 5. Distributions (continued)

Historically, the Company had an “opt in” distribution reinvestment plan for its shareholders. As a result, if the Company made a cash distribution, its shareholders would receive distributions in cash unless they specifically “opted in” to the distribution reinvestment plan so as to have their cash distributions reinvested in additional common shares. However, certain state authorities or regulators may have imposed restrictions from time to time that may have prevented or limited a shareholder's ability to participate in the distribution reinvestment plan. The Company's distribution reinvestment plan was terminated effective as of September 15, 2023.

Under the prior distribution reinvestment plan, cash distributions to participating shareholders would be reinvested in additional common shares at a purchase price determined by the Company’s board of trustees, or a committee thereof, in its sole discretion, that was (i) not less than the net asset value per common share as determined in good faith by the Company’s board of trustees or a committee thereof, in its sole discretion, immediately prior to the payment of the distribution and (ii) not more than 2.5% greater than the net asset value per common share as of such date. Any distributions reinvested under the plan would remain taxable to a U.S. shareholder.

The Company may fund its cash distributions to shareholders from any sources of funds legally available to it, including proceeds from the sale of the Company’s common shares, borrowings, net investment income from operations, capital gains proceeds from the sale of assets and non-capital gains proceeds from the sale of assets, dividends or other distributions paid to the Company on account of preferred and common equity investments in portfolio companies. The Company has not established limits on the amount of funds it may use from available sources to make distributions. The Company's distribution proceeds have exceeded and in the future may exceed its earnings. Therefore, portions of the distributions that the Company has made represented, and may make in the future may represent, a return of capital to shareholders, which lowers their tax basis in their common shares. A return of capital generally is a return of a shareholder’s investment rather than a return of earnings or gains derived from the Company’s investment activities. Each year a statement on Form 1099-DIV identifying the sources of the distributions (i.e., paid from ordinary income, paid from net capital gains on the sale of securities, and/or a return of capital, which is a nontaxable distribution) will be mailed to the Company’s shareholders. There can be no assurance that the Company will be able to pay distributions at a specific rate or at all.

The following table reflects the sources of the cash distributions on a tax basis that the Company declared on its common shares during the nine months ended September 30, 2023 and 2022:

	Nine Months Ended September 30,
	2023				2022
Source of Distribution	Distribution Amount		Percentage		Distribution Amount		Percentage
Net investment income(1)	$	27,208	100	%	$	40,395	100	%
Short-term capital gains proceeds from the sale of assets	—		—		—		—
Long-term capital gains proceeds from the sale of assets	—		—		—		—
Total	$	27,208	100	%	$	40,395	100	%

_________________________

(1)    During the nine months ended September 30, 2023 and 2022, 83.8% and 80.9%, respectively, of the Company's gross investment income was attributable to cash income earned, 12.3% and 14.7%, respectively, was attributable to paid-in-kind, or PIK, interest and 3.9% and 4.4%, respectively, was attributable to non-cash accretion of discount.

In the past, the Company has experienced restructurings and defaults and may experience such events again in the future. Any restructuring or default may have an impact on the level of income received by the Company.

The determination of the tax attributes of the Company’s distributions is made annually as of the end of the Company’s fiscal year based upon the Company’s taxable income for the full year and distributions paid for the full year. Therefore, a determination made on a quarterly basis may not be representative of the actual tax attributes of the Company's distributions for a full year. The actual tax characteristics of distributions to shareholders are reported to shareholders annually on Form 1099-DIV.

Net capital losses may be carried forward indefinitely, and their character is retained as short-term or long-term. As of September 30, 2023, the Company had short-term and long-term capital loss carryforwards available to offset future realized capital gains of $73,519 and $1,451,516, respectively.

As of September 30, 2023 and December 31, 2022, for federal income tax purposes, the gross unrealized appreciation on the Company’s investments, swap contracts and unrealized gain on foreign currency was $203,031 and $334,635, respectively, and the gross unrealized depreciation on the Company’s investments, swap contracts and unrealized loss on foreign currency was $262,695 and $512,206, respectively.

24

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 5. Distributions (continued)

The aggregate cost of the Company’s investments for federal income tax purposes totaled $1,552,114 and $2,223,943 as of September 30, 2023 and December 31, 2022, respectively. The aggregate net unrealized appreciation (depreciation) on a tax basis was $(59,348) and $(176,828) as of September 30, 2023 and December 31, 2022, respectively.

As of September 30, 2023 and December 31, 2022, the Company had deferred tax assets of $151,115 and $145,383, respectively, resulting from interest expense disallowance, net operating losses and capital losses of the Company's wholly-owned taxable subsidiaries. As of September 30, 2023 and December 31, 2022, the Company had deferred tax liabilities of $3,129 and $28,753, respectively, resulting from unrealized appreciation on investments held by the Company's wholly-owned taxable subsidiaries. As of September 30, 2023 and December 31, 2022, certain wholly-owned taxable subsidiaries anticipated that they would be unable to fully utilize their deferred tax assets, therefore the deferred tax assets were offset by valuation allowances of $147,986 and $116,630, respectively. For the nine months ended September 30, 2023, the Company did not record a provision for taxes related to its wholly-owned taxable subsidiaries. For the year ended December 31, 2022, the Company recorded a provision for taxes related to its wholly-owned taxable subsidiaries of $1,207 related to current taxes.

Note 6. Financial Instruments

The Company may trade in financial instruments with off-balance sheet risk in the normal course of its investing activities. During the nine months ended September 30, 2023 and 2022, the Company utilized commodity fixed price swaps to economically hedge certain risks against natural gas and crude oil price exposure related to certain investments in the Company's portfolio. On September 20, 2023, the Company entered into an equity total return swap to obtain exposure to a security without owning such security. While the use of these derivative instruments limits the downside risk of adverse price movements, their use also limits future revenues from upward price movements.

Fixed Price Swaps

A fixed price swap is a contract between two parties in which settlements are made at a specified time based on the difference between the fixed price specified in the contract and the referenced settlement price. When the referenced settlement price is less than the price specified in the contract, the Company receives an amount from the counterparty based on the price difference multiplied by the volume. Similarly, when the referenced settlement price exceeds the price specified in the contract, the Company pays the counterparty an amount based on the price difference multiplied by the volume.

The Company's fixed price swaps are settled monthly and the settlement prices contained in these fixed price swaps are based on commodity exchanges; the NYMEX Henry Hub for natural gas and the ICE Brent for oil. Gas volumes are measured in one million British thermal units, or MMBtus, and oil volumes are measured in barrels, or Bbls. The changes in the value of the fixed price swaps are recorded as unrealized appreciation or depreciation on swap contracts in the consolidated balance sheets. The Company's fixed price swaps settle monthly and the changes in the value of the fixed price swaps are recorded as realized gains or losses in the consolidated statements of operations. The primary underlying risk exposure through the use of fixed price swaps is commodity price risk of the underlying commodity, such as natural gas and crude oil.

Total Return Swaps

A total return swap is a contract in which there is an exchange of cash flows whereby one party agrees to make periodic payments based on the total return (distributions plus capital gains/losses) of an underlying instrument in exchange for fixed or floating rate interest payments. If the total return of the instrument or index underlying the transaction exceeds or falls short of the offsetting fixed or floating interest rate obligation, the Company receives payment from or makes a payment to the counterparty. Total return swaps are entered into to obtain exposure to a security or market without owning such security or investing directly in such market or to exchange the risk/return of one market with another market.

On September 20, 2023, the Company entered into an equity total return swap, or equity TRS, with Nomura Global Financial Products Inc., or Nomura. Under the equity TRS, the Company obtains the economic benefit of owning shares of FS Credit Opportunities Corp., or FSCO, an investment company registered under the 1940 Act, without actually owning them, and Nomura will receive an interest-type payment in return. The investment adviser to FSCO is wholly-owned by Franklin Square Holdings, L.P., which is also the majority owner of FS/EIG Advisor.

25

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 6. Financial Instruments (continued)

The Company's equity TRS is marked-to-market daily and the change in market value is recorded as unrealized appreciation or depreciation on swap contracts in the consolidated balance sheets. Pursuant to its terms, the Company's equity TRS settles monthly and a realized gain or loss is recorded in the consolidated statements of operations equal to the difference between the value of the shares underlying the equity TRS at the time the swap was entered into or the previous settlement date and the value as of the current settlement date. Any dividends received by Nomura as holder of the FSCO shares are paid to the Company. The equity TRS has a term of three years, but it could be terminated earlier in whole or in part following the occurrence of certain prescribed events agreed to between Nomura and the Company. The primary underlying risk exposure through the use of equity total return swaps is equity market risk.

During the nine months ended September 30, 2023, the average monthly notional volume of commodity fixed price swaps—crude oil and commodity fixed price swaps—natural gas outstanding were 109,764 Bbls and 198,215 MMBtus, respectively. The average notional amount of the equity total return swap from the initial trade date of September 25, 2023 through September 30, 2023 was $1,721.

The following table presents the fair value of open swap contracts (which are not considered to be hedging instruments for accounting purposes) as of September 30, 2023 and December 31, 2022:

	September 30, 2023 (Unaudited)				December 31, 2022
Instrument	Asset(1)		Liability(2)		Asset(1)		Liability(2)
Commodity Fixed Price Swaps—Crude Oil	$	—	$	(404)	$	—	$	(572)
Commodity Fixed Price Swaps—Natural Gas	36		—		—		(126)
Equity Total Return Swaps	70		—		—		—
Total	$	106	$	(404)	$	—	$	(698)

______________

(1)    Reflected on the Company's consolidated balance sheets as: Unrealized appreciation on swap contracts.

(2)    Reflected on the Company's consolidated balance sheets as: Unrealized depreciation on swap contracts.

The effect of swap contracts (which are not considered to be hedging instruments for accounting purposes) on the Company's statements of operations for the nine months ended September 30, 2023 and 2022 was as follows:

	Net Realized Gains (Losses)(1)				Net Change in Unrealized Appreciation (Depreciation)(2)
	Nine Months Ended September 30,				Nine Months Ended September 30,
Instrument	2023		2022		2023		2022
Commodity Fixed Price Swaps—Crude Oil	$	(259)	$	(1,968)	$	168	$	672
Commodity Fixed Price Swaps—Natural Gas	348		(652)		162		(678)
Equity Total Return Swaps	(1)		—		70		—
Total	$	88	$	(2,620)	$	400	$	(6)

______________

(1)    Reflected on the Company's consolidated statements of operations as: Net realized gain (loss) on swap contracts.

(2)    Reflected on the Company's consolidated statements of operations as: Net change in unrealized appreciation (depreciation) on swap contracts.

26

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 6. Financial Instruments (continued)

Offsetting of Derivative Instruments

The Company has derivative instruments that are subject to master netting agreements. These agreements include provisions to offset positions with the same counterparty in the event of default by one of the parties. The Company’s unrealized appreciation and depreciation on derivative instruments are reported as gross assets and liabilities, respectively, in the consolidated balance sheets.

The following tables present the Company’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement and net of any collateral received or pledged by the Company for such assets and liabilities as of September 30, 2023 and December 31, 2022:

	As of September 30, 2023 (Unaudited)
Counterparty	Derivative Assets		Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)		Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	$	36	$	(404)	$	(368)	—	—		$	(368)
Nomura Global Financial Products Inc.	$	70	—		$	70	—	$	(70)	—

	As of December 31, 2022
Counterparty	Derivative Assets	Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)	Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	—	$	(698)	$	(698)	—	—	$	(698)

______________

(1)    In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization.

(2)    Net amount of derivative assets and liabilities represents the net amount due from the counterparty to the Company and the net amount due from the Company to the counterparty, respectively, in the event of default.

Note 7. Investment Portfolio

The following table summarizes the composition of the Company’s investment portfolio at cost and fair value as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)						December 31, 2022
	Amortized Cost(1)		Fair Value		Percentage of Portfolio		Amortized Cost(1)		Fair Value		Percentage of Portfolio
Senior Secured Loans—First Lien	$	675,016	$	631,307	42	%	$	702,842	$	706,646	35	%
Senior Secured Loans—Second Lien	70,267		69,599		5	%	143,153		143,270		7	%
Senior Secured Bonds	33,385		32,681		2	%	10,064		10,074		0	%
Unsecured Debt	108,367		109,302		7	%	253,675		241,418		12	%
Preferred Equity	252,450		259,205		18	%	425,182		400,414		20	%
Sustainable Infrastructure Investments, LLC	54,514		49,192		3	%	54,514		51,098		2	%
Equity/Other	259,083		341,480		23	%	333,510		494,195		24	%
Total	$	1,453,082	$	1,492,766	100	%	$	1,922,940	$	2,047,115	100	%

______________

(1)    Amortized cost represents the original cost adjusted for the amortization of premiums and/or accretion of discounts, as applicable, on investments.

In general, under the 1940 Act, the Company would be presumed to “control” a portfolio company if it owned more than 25% of its voting securities or it had the power to exercise control over the management or policies of a portfolio company, and would be an “affiliated person” of a portfolio company if it owned 5% or more of its voting securities.

As of September 30, 2023, the Company held investments in four portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control.” As of September 30, 2023, the Company held investments in three portfolio companies of which it is deemed to “control.” For additional information with respect to such portfolio companies, see footnotes (s) and (t) to the unaudited consolidated schedule of investments as of September 30, 2023 in this quarterly report on Form 10-Q.

As of December 31, 2022, the Company held investments in six portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control.” As of December 31, 2022, the Company held investments in three portfolio

27

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 7. Investment Portfolio (continued)

companies of which it is deemed to “control.” For additional information with respect to such portfolio companies, see footnotes (t) and (u) to the consolidated schedule of investments as of December 31, 2022 in this quarterly report on Form 10-Q.

The Company’s investment portfolio may contain loans or bonds that are in the form of lines of credit or revolving credit facilities, or other investments, pursuant to which the Company may be required to provide funding when requested by portfolio companies in accordance with the terms of the underlying agreements. As of September 30, 2023, the Company had three senior secured loan investments with aggregate unfunded commitments of $6,741 and unfunded commitments of $7,625 in U.S. dollars and $858 in Canadian dollars to contribute capital to Sustainable Infrastructure Investments, LLC. As of December 31, 2022, the Company had six senior secured loan investments with aggregate unfunded commitments of $25,891 and unfunded commitments of $7,625 in U.S dollars and $858 in Canadian dollars to contribute capital to Sustainable Infrastructure Investments, LLC. The Company maintains sufficient cash on hand, available borrowings and/or liquid securities to fund such unfunded commitments should the need arise.

The table below describes investments by industry classification and enumerates the percentage, by fair value, of the total portfolio assets in such industries as of September 30, 2023 and December 31, 2022:

	September 30, 2023 (Unaudited)				December 31, 2022
Industry Classification	Fair Value		Percentage of Portfolio		Fair Value		Percentage of Portfolio
Energy—Upstream	$	533,790	36	%	$	854,974	42	%
Energy—Midstream	423,991		28	%	646,488		32	%
Energy—Power	194,940		13	%	386,007		19	%
Consumer Services	51,022		3	%	—		—
Energy—Service & Equipment(1)	49,724		3	%	96,040		5	%
Capital Goods	29,821		2	%	—		—
Consumer Discretionary Distribution & Retail	27,975		2	%	—		—
Commercial & Professional Services(1)	22,062		2	%	12,508		0	%
Household & Personal Products	20,297		1	%	—		—
Financial Services	19,939		1	%	—		—
Pharmaceuticals, Biotechnology & Life Sciences	19,400		1	%	—		—
Insurance	11,275		1	%	—		—
Transportation	9,851		1	%	—		—
Automobiles & Components	9,849		1	%	—		—
Consumer Staples Distribution & Retail	9,844		1	%	—		—
Health Care Equipment & Services	9,794		1	%	—		—
Sustainable Infrastructure Investments, LLC(2)	49,192		3	%	51,098		2	%
Total	$	1,492,766	100	%	$	2,047,115	100	%

_____________________

(1)    FS/EIG Advisor monitors the industry classification of the Company’s investments and may from time to time reclassify such investments if it determines such reclassification is appropriate. During the nine months ended September 30, 2023, two investments had their industry re-classified from Energy—Industrials to Commercial & Professional Services, and one investment had its industry re-classified from Energy—Service & Equipment to Commercial & Professional Services.

(2)    Sustainable Infrastructure Investments, LLC is generally comprised of midstream and renewables assets in the Energy sector.

Sustainable Infrastructure Investments, LLC

Sustainable Infrastructure Investments, LLC, or SIIJV, is a joint venture between the Company and Imperial Sustainable Infrastructure Investments, LLC, or Imperial, a subsidiary of Imperial Capital Asset Management, LLC, or ICAM. The joint venture is governed pursuant to the terms of an amended and restated limited liability company agreement of SIIJV, dated as of January 2, 2020, between the Company and Imperial, or the SIIJV Agreement. The SIIJV Agreement requires the Company and Imperial to provide capital to SIIJV of up to $67,629 in U.S. dollars and $5,430 in Canadian dollars in the aggregate where the Company and Imperial would provide 87.5% and 12.5%, respectively, of the committed capital. Pursuant to the terms of the SIIJV Agreement, the Company and Imperial each have 50% voting control of SIIJV and are required to agree on all investment decisions as well as all other significant actions for SIIJV. SIIJV invests in senior secured loans (both first lien and second lien) to middle market companies,

28

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 7. Investment Portfolio (continued)

broadly syndicated loans and other midstream, renewables and power assets. As administrative agent of SIIJV, the Company performs certain day-to-day management responsibilities on behalf of SIIJV and is entitled to a fee in the annual amount of 0.25% of SIIJV’s net assets under administration, calculated and payable quarterly in arrears. As of September 30, 2023, the Company and Imperial funded approximately $62,300 to SIIJV, of which $54,514 was from the Company. The Company does not consolidate SIIJV in its consolidated financial statements.

On January 2, 2020, Seine Funding, LLC, or Seine Funding, a wholly-owned subsidiary of SIIJV, entered into a credit facility, as amended, or the Seine Funding Facility, with certain financial institutions as lender, agent, collateral agent, collateral administrator, and collateral custodian, and SIIJV, as collateral manager. The Seine Funding Facility provides for borrowings in U.S. dollars and certain agreed upon foreign currencies in an aggregate principal amount of up to $634,103 on a committed basis, which may be increased under certain circumstances at the request of Seine Funding and with the consent of the lender and agent. The end of the reinvestment period for the Seine Funding Facility was on December 31, 2020. The maturity date for the Seine Funding Facility is the earlier of (i) the latest maturity date among the assets securing the facility and (ii) the first date, after the end of the reinvestment period, on which all assets securing the facility are paid in full. Under the Seine Funding Facility, borrowings bear interest at the rate of three-month LIBOR (or the relevant reference rate for any foreign currency borrowings) (subject to a 0% floor) plus 1.20% per annum. Borrowings under the Seine Funding Facility are secured by a first priority security interest in substantially all of the assets of Seine Funding. As of September 30, 2023, total outstanding borrowings under the Seine Funding Facility were $195,734.

Below is a summary of SIIJV's portfolio, followed by a listing of the individual loans in SIIJV's portfolio as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)			December 31, 2022
Total investments(1)	$	192,881		$	274,088
Weighted average current interest rate on debt investments(2)	7.35		%	6.96		%
Number of portfolio assets in SIIJV	8			9
Largest investment in a single portfolio company(1)	$	57,784		$	73,707

_____________________

(1)    At cost.

(2)    Computed as the (a) annual stated interest rate on accruing debt, divided by (b) total debt at par amount.

Sustainable Infrastructure Investments, LLC Portfolio

As of September 30, 2023

(Unaudited)

Portfolio Company(a)(f)	Footnotes	Energy Industry	Rate(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Lien—100.0%
Blue Heron Intermediate Holdco I, LLC		Midstream	S+188	4/22/24	$	30,958	$	30,958	$	31,004
Cedar Creek II LLC		Renewables	S+188	11/18/23	8,160		8,160		8,166
Copper Mountain Solar 3, LLC		Renewables	S+188	5/31/25	17,105		17,105		17,209
FLNG Liquefaction 2, LLC		Midstream	S+150	12/31/26	26,972		26,972		26,835
Meikle Wind Energy, LP	(e)	Renewables	C+150	5/12/24	C$	15,431	11,872		11,405
NES Hercules Class B Member, LLC		Renewables	S+163	1/31/28	$	24,176	24,176		24,596
ST EIP Holdco LLC		Midstream	S+250	11/5/24	57,784		57,784		57,577
Top of the World Wind Energy LLC		Renewables	S+213	12/1/28	15,854		15,854		16,137
Total Senior Secured Loans—First Lien							192,881		192,929
TOTAL INVESTMENTS—100.0%							$	192,881	$	192,929

29

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 7. Investment Portfolio (continued)

Sustainable Infrastructure Investments, LLC Portfolio

As of December 31, 2022

Portfolio Company(a)(f)	Footnotes	Industry	Rate(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Lien—100.0%
Alianca Transportadora de Gas Participacoes S.A.		Midstream	L+260	5/23/27	$	73,707	$	73,707	$	74,601
Blue Heron Intermediate Holdco I, LLC		Midstream	L+188	4/22/24	31,832		31,832		31,885
Cedar Creek II LLC		Renewables	L+188	11/18/23	8,710		8,710		8,722
Copper Mountain Solar 3, LLC		Renewables	L+175	5/31/25	17,804		17,804		17,879
FLNG Liquefaction 2, LLC		Midstream	L+150	12/31/26	28,170		28,170		27,990
Meikle Wind Energy, LP	(e)	Renewables	C+150	5/12/24	C$	16,030	12,332		11,873
NES Hercules Class B Member, LLC		Renewables	L+150	1/31/28	$	24,487	24,487		24,954
ST EIP Holdco LLC		Midstream	L+250	11/5/24	58,673		58,673		58,288
Top of the World Wind Energy LLC		Renewables	L+188	12/1/28	18,373		18,373		18,866
Total Senior Secured Loans—First Lien							274,088		275,058
TOTAL INVESTMENTS—100.0%							$	274,088	$	275,058

_____________________

Percentages are shown as a percentage of total investments.

(a)    Security may be an obligation of one or more entities affiliated with the named company.

(b)    Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023 and December 31, 2022, the three-month LIBOR, or L, was 5.66% and 4.77%, respectively, the Canadian Dollar Offered Rate, or C, was 5.51% and 4.94%, respectively, and the SOFR, or S, was 5.40% and 4.59%, respectively.

(c)    Denominated in U.S. dollars unless otherwise noted.

(d)    Security is classified as Level 3 and fair value is determined in accordance with the Company’s valuation process.

(e)    Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of September 30, 2023 and December 31, 2022.

(f)    Security or portion thereof is held within Seine Funding and is pledged as collateral supporting the amounts outstanding under the Seine Funding Facility.

Below is selected balance sheet information for SIIJV as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)		December 31, 2022
Selected Balance Sheet Information
Total investments, at fair value	$	192,929	$	275,058
Cash and other assets	78,241		10,380
Total assets	$	271,170	$	285,438
Debt	$	195,734	$	213,583
Other liabilities	3,159		3,358
Total liabilities	198,893		216,941
Member's equity	$	72,277	$	68,497

30

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 7. Investment Portfolio (continued)

Below is selected statement of operations information for SIIJV for the three and nine months ended September 30, 2023 and 2022:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Selected Statement of Operations Information
Total investment income	$	5,272	$	3,313	$	15,083	$	7,386
Expenses
Interest expense	3,410		1,201		9,870		3,352
Administrative services	46		42		134		123
Custodian and accounting fees	58		23		161		127
Professional services	70		25		170		76
Other	11		44		31		44
Total expenses	3,595		1,335		10,366		3,722
Net investment income	1,677		1,978		4,717		3,664
Net realized and unrealized gain (loss)	(2,273)		836		(937)		(1,180)
Net increase (decrease) in net assets resulting from operations	$	(596)	$	2,814	$	3,780	$	2,484

Note 8. Fair Value of Financial Instruments

Under existing accounting guidance, fair value is defined as the price that the Company would receive upon selling an investment or pay to transfer a liability in an orderly transaction to a market participant in the principal or most advantageous market for the investment. This accounting guidance emphasizes valuation techniques that maximize the use of observable market inputs and minimize the use of unobservable inputs. Inputs refer broadly to the assumptions that market participants would use in pricing an asset or liability, including assumptions about risk. Inputs may be observable or unobservable. Observable inputs are inputs that reflect the assumptions market participants would use in pricing an asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the assumptions market participants would use in pricing an asset or liability developed based on the best information available in the circumstances. The Company classifies the inputs used to measure these fair values into the following hierarchy as defined by current accounting guidance:

Level 1: Inputs that are quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2: Inputs that are quoted prices for similar assets or liabilities in active markets.

Level 3: Inputs that are unobservable for an asset or liability.

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

As of September 30, 2023 and December 31, 2022, the Company’s investments were categorized as follows in the fair value hierarchy:

Valuation Inputs	September 30, 2023  (Unaudited)		December 31, 2022
Level 1—Price quotations in active markets	$	2,023	$	2,465
Level 2—Significant other observable inputs	313,384		450,445
Level 3—Significant unobservable inputs	1,177,359		1,594,205
Total	$	1,492,766	$	2,047,115

31

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 8. Fair Value of Financial Instruments (continued)

As of September 30, 2023 and December 31, 2022, the Company’s swap contracts were categorized as follows in the fair value hierarchy:

	September 30, 2023  (Unaudited)				December 31, 2022
Valuation Inputs	Assets		Liabilities		Assets		Liabilities
Level 1—Price quotations in active markets	$	—	$	—	$	—	$	—
Level 2—Significant other observable inputs	106		404		—		698
Level 3—Significant unobservable inputs	—		—		—		—
Total	$	106	$	404	$	—	$	698

The Company’s board of trustees is responsible for overseeing the valuation of the Company’s portfolio investments at fair value as determined in good faith pursuant to FS/EIG Advisor’s valuation policy. The Company’s board of trustees has designated FS/EIG Advisor with day-to-day responsibility for implementing the portfolio valuation process set forth in FS/EIG Advisor’s valuation policy.

The Company’s investments consist primarily of investments that were acquired directly from the issuer. Debt investments, for which broker quotes or pricing information from third-party pricing services are not generally available, are valued by FS/EIG Advisor with the assistance of independent valuation firms, which determine a valuation range of fair value for such investments by considering, among other factors, the borrower’s ability to adequately service its debt, prevailing interest rates for like investments, call features, anticipated prepayments and other relevant terms of the investments. Except as described below, the Company’s investment in SIIJV and all of the Company’s preferred equity and equity/other investments are also valued by independent valuation firms, which determine the fair value of such investments by considering, among other factors, contractual rights ascribed to such investments, as well as various income scenarios and multiples of earnings before interest, taxes, depreciation and amortization, or EBITDA, cash flows, net income, revenues or, in limited instances, book value, PV-10 multiples or liquidation value. An investment that is newly issued and purchased near the date of the financial statements is valued at cost if FS/EIG Advisor determines that the cost of such investment is the best indication of its fair value. Such investments described above are typically classified as Level 3 within the fair value hierarchy. Investments that are traded on an active public market are valued at their closing price as of the date of the financial statements and are classified as Level 1 within the fair value hierarchy. Except as described above, FS/EIG Advisor typically values the Company’s other investments by using the midpoint of the prevailing bid and ask prices from dealers on the date of the relevant period end, which are provided by an independent third-party pricing service and screened for validity by such service and are typically classified as Level 2 within the fair value hierarchy. In determining the fair values of fixed price swaps, FS/EIG Advisor utilizes an industry-standard pricing model that considers various inputs including quoted forward prices for commodities, time value and current market and contractual prices for the underlying instruments. The fair value of the equity total return swap is determined daily based on the market price of the underlying asset. These assumptions are observable in the marketplace or can be corroborated by active markets or broker quotes and are typically classified as Level 2 within the fair value hierarchy.

FS/EIG Advisor periodically benchmarks the bid and ask prices it receives from the third-party pricing service and/or dealers and independent valuation firms, as applicable, against the actual prices at which the Company purchases and sells its investments. Based on the results of the benchmark analysis and the experience of the Company’s management in purchasing and selling these investments, FS/EIG Advisor believes that these prices are reliable indicators of fair value. FS/EIG Advisor reviewed the valuation determinations made with respect to these investments in a manner consistent with FS/EIG Advisor’s valuation policy.

32

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 8. Fair Value of Financial Instruments (continued)

The following is a reconciliation for the nine months ended September 30, 2023 and 2022 of investments for which significant unobservable inputs (Level 3) were used in determining fair value:

	For the Nine Months Ended September 30, 2023
	Senior Secured Loans—First Lien		Senior Secured Loans—Second Lien		Senior Secured Bonds		Unsecured Debt		Preferred Equity		Sustainable Infrastructure Investments, LLC		Equity/Other		Total
Fair value at beginning of period	$	443,245	$	143,270	$	10,074	$	54,374	$	400,414	$	51,098	$	491,730	$	1,594,205
Accretion of discount (amortization of premium)	1,369		710		38		105		1,230		—		—		3,452
Net realized gain (loss)	(2,864)		(52)		4		8		(11,847)		—		(34,851)		(49,602)
Net change in unrealized appreciation (depreciation)	(47,570)		(785)		(229)		416		31,523		(1,906)		(78,656)		(97,207)
Purchases	65,317		—		—		—		—		—		246		65,563
Paid-in-kind interest	9,834		—		—		4,340		—		—		—		14,174
Sales and repayments	(76,948)		(73,544)		(107)		(1,500)		(162,115)		—		(39,822)		(354,036)
Transfers into Level 3(1)	—		—		—		—		—		—		810		810
Transfers out of Level 3	—		—		—		—		—		—		—		—
Fair value at end of period	$	392,383	$	69,599	$	9,780	$	57,743	$	259,205	$	49,192	$	339,457	$	1,177,359
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	$	(50,106)	$	(591)	$	(229)	$	416	$	25,880	$	(1,906)	$	(108,706)	$	(135,242)

	For the Nine Months Ended September 30, 2022
	Senior Secured Loans—First Lien		Senior Secured Loans—Second Lien		Senior Secured Bonds		Unsecured Debt		Preferred Equity		Sustainable Infrastructure Investments, LLC		Equity/Other		Total
Fair value at beginning of period	$	414,075	$	84,083	$	10,371	$	104,659	$	497,288	$	50,770	$	460,236	$	1,621,482
Accretion of discount (amortization of premium)	1,426		194		36		105		3,473		—		—		5,234
Net realized gain (loss)	(12,186)		446		—		(27,541)		1,329		—		64,960		27,008
Net change in unrealized appreciation (depreciation)	26,048		(201)		(212)		34,394		(9,441)		1,277		82,667		134,532
Purchases	110,486		110,150		—		19,800		—		—		16,052		256,488
Paid-in-kind interest	9,627		537		—		7,916		188		—		—		18,268
Sales and repayments	(122,163)		(49,577)		—		(84,415)		(61,186)		—		(104,518)		(421,859)
Transfers into Level 3(1)	58,705		—		—		—		—		—		2,836		61,541
Transfers out of Level 3	—		—		—		—		—		—		—		—
Fair value at end of period	$	486,018	$	145,632	$	10,195	$	54,918	$	431,651	$	52,047	$	522,233	$	1,702,694
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	$	16,286	$	22	$	(212)	$	(293)	$	(6,787)	$	1,277	$	83,316	$	93,609

______________

(1)    Changes in inputs or methodologies used for valuing investments may result in transfers into or out of levels within the fair value hierarchy. Transfers between levels of the fair value hierarchy are deemed to have occurred at the beginning of the reporting period. For the nine months ended September 30, 2023 and 2022, transfers into Level 3 were due to decreased price transparency.

33

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 8. Fair Value of Financial Instruments (continued)

The valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements as of September 30, 2023 and December 31, 2022 were as follows:

Type of Investment	Fair Value at September 30, 2023 (Unaudited)		Valuation Technique(1)	Unobservable Input	Range	Weighted Average
Senior Secured Loans—First Lien	$	358,949	Market Comparables	Market Yield (%)	8.8%-21.3%	13.6%
				EBITDA Multiples (x)	3.9x-7.7x	5.4x
	4,275		Discounted Cash Flow	Discount Rate (%)	9.0%-14.0%	11.5%
	19,400		Cost
	9,759		Other(2)
Senior Secured Loans—Second Lien	69,599		Market Comparables	Market Yield (%)	12.7%-14.5%	13.6%
Senior Secured Bonds	9,780		Market Comparables	Market Yield (%)	7.8%-8.8%	8.3%
Unsecured Debt	18,284		Market Comparables	Market Yield (%)	10.8%-11.8%	11.3%
	39,459		Other(2)
Preferred Equity	259,205		Market Comparables	Market Yield (%)	11.0%-26.8%	20.1%
				EBITDA Multiples (x)	13.3x-14.3x	13.8x
				Net Aircraft Book Value Multiple (x)	1.0x-1.0x	1.0x
Sustainable Infrastructure Investments, LLC	49,192		Discounted Cash Flow	Discount Rate (%)	13.5%-14.5%	14.0%
Equity/Other	308,680		Market Comparables	EBITDA Multiples (x)	2.8x-14.3x	6.1x
				Production Multiples (Mboe/d)	$26,591.0-$29,529.0	$28,060.0
				Proved Reserves Multiples (Mmboe)	$5.6-$6.2	$5.9
				Production Multiples (MMcfe/d)	$3,000.0-$3,600.0	$3,300.0
				Proved Reserves Multiples (Bcfe)	0.7x-0.7x	0.7x
				PV-10 Multiples (x)	0.3x-0.9x	0.8x
	2,478		Discounted Cash Flow	Discount Rate (%)	8.0%-35.0%	11.7%
	11,250		Option Valuation Model	Volatility (%)	27.2%-65.0%	36.4%
	17,049		Other(2)
Total	$	1,177,359

34

FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 8. Fair Value of Financial Instruments (continued)

Type of Investment	Fair Value at December 31, 2022		Valuation Technique(1)	Unobservable Input	Range	Weighted Average
Senior Secured Loans—First Lien	$	413,268	Market Comparables	Market Yield (%)	8.5%-21.8%	12.3%
				EBITDA Multiples (x)	5.0x-7.5x	6.3x
	29,977		Discounted Cash Flow	Discount Rate (%)	11.5%-19.5%	15.4%
Senior Secured Loans—Second Lien	143,270		Market Comparables	Market Yield (%)	10.3%-14.3%	11.8%
Senior Secured Bonds	10,074		Market Comparables	Market Yield (%)	6.9%-7.9%	7.4%
Unsecured Debt	19,256		Market Comparables	Market Yield (%)	10.3%-11.3%	10.8%
	35,118		Other(2)
Preferred Equity	316,767		Market Comparables	Market Yield (%)	8.8%-30.3%	19.0%
				EBITDA Multiples (x)	9.5x-10.5x	10.0x
				Net Aircraft Book Value Multiple (x)	1.0x-1.0x	1.0x
	83,647		Discounted Cash Flow	Discount Rate (%)	11.3%-12.3%	11.8%
Sustainable Infrastructure Investments, LLC	51,098		Discounted Cash Flow	Discount Rate (%)	13.5%-14.5%	14.0%
Equity/Other	481,623		Market Comparables	EBITDA Multiples (x)	1.8x-10.5x	5.4x
				Production Multiples (Mboe/d)	$27,946.0-$37,500.0	$30,265.3
				Proved Reserves Multiples (Mmboe)	$6.9-$10.3	$7.6
				Production Multiples (MMcfe/d)	$3,400.0-$3,700.0	$3,550.0
				Proved Reserves Multiples (Bcfe)	0.8x-0.9x	0.8x
				PV-10 Multiples (x)	0.5x-0.9x	0.8x
	2,488		Discounted Cash Flow	Discount Rate (%)	8.0%-33.0%	23.8%
	5,734		Option Valuation Model	Volatility (%)	31.5%-55.1%	36.6%
	1,885		Other(2)
Total	$	1,594,205

______________

(1)    For investments utilizing a market comparables valuation technique, a significant increase (decrease) in the market yield, in isolation, would result in a significantly lower (higher) fair value measurement, and a significant increase (decrease) in any of the valuation multiples, in isolation, would result in a significantly higher (lower) fair value measurement. For investments utilizing a discounted cash flow valuation technique, a significant increase (decrease) in the discount rate, in isolation, would result in a significantly lower (higher) fair value measurement. For investments utilizing an option valuation model valuation technique, a significant increase (decrease) in the volatility, in isolation, would result in a significantly higher (lower) fair value measurement.

(2)    Fair valued based on expected outcome of proposed corporate transactions, the expected value of the liquidation preference of the investment or other factors.

Note 9. Financing Arrangements

The following tables present a summary of information with respect to the Company’s outstanding financing arrangements as of September 30, 2023 and December 31, 2022. For additional information regarding these financing arrangements, see the notes to the Company’s audited consolidated financial statements contained in its annual report on Form 10-K for the year ended December 31, 2022. Any significant changes to the Company’s financing arrangements during the nine months ended September 30, 2023 are discussed below.

	As of September 30, 2023  (Unaudited)
Arrangement(1)	Type of Arrangement	Rate(2)	Amount Outstanding		Amount Available		Maturity Date
Barclays Facility	Repurchase	Term SOFR+3.42%	$	80,000	$	420,000	September 6, 2026
Total			$	80,000	$	420,000

	As of December 31, 2022
Arrangement(1)	Type of Arrangement	Rate(4)	Amount Outstanding		Amount Available		Maturity Date
JPMorgan Facility	Term Loan	L+3.00%	$	305,676	$	—	February 16, 2023(5)
Senior Secured Notes(3)	Bond	7.50%	457,075		—		August 15, 2023(6)
Total			$	762,751	$	—

______________________

(1)    The carrying amount outstanding under the facility approximates its fair value, unless otherwise noted.

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FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 9. Financing Arrangements (continued)

(2)    The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the Collateral Obligations (such individual margins ranging from 1.90% to 4.20%, depending on the type of Collateral Obligations; subject to a floor, in the aggregate, of 3.00%).

(3)    As of December 31, 2022, the fair value of the Senior Secured Notes was approximately $458,908. This valuation is considered a Level 2 valuation within the fair value hierarchy.

(4)    LIBOR was subject to a 0.00% floor.

(5)    On February 14, 2023, the Company repaid and terminated the JPMorgan Facility.

(6)    On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.

For the nine months ended September 30, 2023 and 2022, the components of total interest expense for the Company's financing arrangements were as follows:

	Nine Months Ended September 30,
	2023						2022
Arrangement(1)	Direct Interest Expense(2)		Amortization of Deferred Financing Costs and Discount		Total Interest Expense		Direct Interest Expense(2)		Amortization of Deferred Financing Costs and Discount		Total Interest Expense
Barclays Facility	$	613	$	125	$	738	$	—	$	—	$	—
JPMorgan Facility(3)	2,790		238		3,028		9,458		1,830		11,288
Senior Secured Notes(4)	12,760		2,540		15,300		26,381		3,325		29,706
Total	$	16,163	$	2,903	$	19,066	$	35,839	$	5,155	$	40,994

___________________

(1)     Borrowings of each of the Company's wholly-owned special-purpose financing subsidiaries are considered borrowings of the Company for purposes of complying with the asset coverage requirements applicable to BDCs under the 1940 Act.

(2)     Direct interest expense includes the effect of non-usage fees, administration fees and make-whole fees, if any.

(3)     On February 14, 2023, the Company repaid and terminated the JPMorgan Facility.

(4)    On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.

The Company’s average borrowings and weighted average interest rate for the period from January 1, 2023 to May 15, 2023, the date on which the Company redeemed 100% of the issued and outstanding Senior Secured Notes, were $557,446 and 7.49%, respectively. The Company had no outstanding borrowings during the period from May 15, 2023 to September 5, 2023. The Company’s average borrowings and weighted average interest rate, including the effect of non-usage fees, for the period from September 6, 2023 (the date on which the Company entered into the Barclays Facility) to September 30, 2023, were $80,000 and 11.03%, respectively. As of September 30, 2023, the Company’s effective interest rate on borrowings, including the effect of non-usage fees, was 8.90%.

The Company’s average borrowings and weighted average interest rate, including the effect of non-usage fees, for the nine months ended September 30, 2022 were $770,774 and 7.01%, respectively. As of September 30, 2022, the Company’s effective interest rate on borrowings was 6.93%.

Under its financing arrangements, the Company made certain representations and warranties and was required to comply with various covenants, reporting requirements and other customary requirements for similar financing arrangements. The Company was in compliance with all covenants required by its financing arrangements as of September 30, 2023 and December 31, 2022.

Barclays Facility

On September 6, 2023, the Company, through two wholly-owned, special purpose financing subsidiaries, FSSL Finance BB AssetCo LLC, or FSSL Finance BB AssetCo, and FSSL Finance BB Seller LLC, or FSSL Finance BB Seller, entered into a financing arrangement with Barclays Bank PLC, or Barclays, pursuant to which up to $500,000 will be made available to fund investments in loans and other corporate securities, or together, the Collateral Obligations, and for other general corporate purposes, or the Barclays Facility.

The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the Collateral Obligations (such individual margins ranging from 1.90% to 4.20%, depending on the type of Collateral Obligations; subject to a floor, in the aggregate, of 3.00%).

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FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 9. Financing Arrangements (continued)

Pursuant to the financing arrangement, the Company may contribute Collateral Obligations from time to time to FSSL Finance BB AssetCo, pursuant to a Sale and Contribution Agreement, dated as of September 6, 2023, between the Company and FSSL Finance BB AssetCo, or the Sale and Contribution Agreement. The assets held by FSSL Finance BB AssetCo secure the obligations of FSSL Finance BB AssetCo under the notes, or the Notes, issued by FSSL Finance BB AssetCo to FSSL Finance BB Seller, pursuant to an indenture, dated as of September 6, 2023, with Computershare Trust Company, N.A., or Computershare, as trustee, or the Indenture.

Principal on the Notes will be due and payable on the stated maturity date of July 1, 2033, and the Notes do not bear interest. Pursuant to the Indenture, FSSL Finance BB AssetCo has made certain representations and warranties and is required to comply with various covenants, reporting requirements and other customary requirements for similar transactions. The Indenture contains events of default customary for similar transactions, including, without limitation: (a) failure to make principal payments on the Notes at their stated maturity or any earlier redemption date or to make interest payments on the Notes; (b) failure to disburse amounts in accordance with the priority of payments; (c) occurrence of certain bankruptcy and insolvency events with respect to FSSL Finance BB AssetCo; and (d) occurrence of a Repurchase Date under the Repurchase Agreement (defined below) as a result of an event of default with respect to FSSL Finance BB Seller. FSSL Finance BB Seller acquired and subscribed for the Notes pursuant to a Subscription Agreement, dated as of September 6, 2023, between FSSL Finance BB AssetCo and FSSL Finance BB Seller as the investor.

On September 6, 2023, FSSL Finance BB Seller entered into a Master Confirmation in respect of Repurchase Transaction with Barclays, or the Confirmation, which supplements and is subject to the Master Repurchase Agreement, dated as of September 6, 2023, between FSSL Finance BB Seller and Barclays, or the Master Repurchase Agreement, and such Master Repurchase Agreement, as supplemented and evidenced by the Confirmation, or the Repurchase Agreement. Pursuant to the Repurchase Agreement, on September 6, 2023, Barclays purchased the Notes held by FSSL Finance BB Seller for an initial purchase price of $80,000, which price may, subject to satisfaction of certain conditions, increase from time to time up to the maximum aggregate purchase price of $500,000. The scheduled Repurchase Date is September 6, 2026.

Pursuant to the Repurchase Agreement, FSSL Finance BB Seller has made certain representations and warranties and is required to comply with various covenants, reporting requirements and other customary requirements for similar transactions. The Repurchase Agreement contains events of default customary for similar financing transactions, including, without limitation: (a) failure to pay the repurchase price upon the applicable payment dates; (b) failure to pay the financing fees and make-whole amounts when due; (c) failure to post collateral as required; (d) occurrence of an event of default under the Indenture, (e) occurrence of insolvency events with respect to FSSL Finance BB Seller; (f) cross default by the Company with respect to its indebtedness above a certain threshold amount and (g) financial covenant breach by the Company.

On September 6, 2023, Notes in an aggregate principal amount of $80,000 were purchased by FSSL Finance BB Seller from FSSL Finance BB AssetCo and subsequently sold to Barclays under the Barclays Facility for aggregate proceeds of $74,502. The carrying amount outstanding under the Barclays Facility approximates its fair value. The Company funded the purchase of Notes by FSSL Finance BB Seller through a capital contribution to FSSL Finance BB Seller. The Notes issued by FSSL Finance BB AssetCo and purchased by FSSL Finance BB Seller eliminate in consolidation on the Company's financial statements.

The Company incurred costs of $5,498 in connection with obtaining the Barclays Facility, which the Company has recorded as deferred financing costs on its consolidated balance sheet and amortizes to interest expense over the life of the Barclays Facility. As of September 30, 2023, $5,373 of such deferred financing costs had yet to be amortized to interest expense.

JPMorgan Facility

On August 16, 2018, the Company entered into that certain Senior Secured Credit Agreement, by and among the Company, the lenders party thereto, JPMorgan Chase Bank, N.A., or JPMorgan, as administrative agent and collateral agent, and the other parties signatory thereto, or as amended, the JPMorgan Facility. On February 14, 2023, the Company repaid and terminated the JPMorgan Facility. Prior to the termination of the JPMorgan Facility, $305,676 aggregate principal amount of loans were outstanding to the Company and such loans accrued interest at a rate equal to LIBOR (subject to a 0.00% floor) plus 3.00% per annum. The Company incurred certain customary costs and expenses in connection with the termination of the JPMorgan Facility.

7.500% Senior Secured Notes due 2023

On August 16, 2018, the Company, U.S. Bank National Association, or U.S Bank, as trustee, and certain subsidiaries of the Company, entered into an Indenture relating to the Company’s issuance of $500,000 aggregate principal amount of its 7.500% Senior Secured Notes due 2023, or the Senior Secured Notes. On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023. The Company incurred certain customary costs and expenses in connection with the redemption of the Senior Secured Notes.

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FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 10. Commitments and Contingencies

The Company enters into contracts that contain a variety of indemnification provisions. The Company’s maximum exposure under these arrangements is unknown; however, the Company has not had prior claims or losses pursuant to these contracts. FS/EIG Advisor has reviewed the Company’s existing contracts and expects the risk of loss to the Company to be remote.

The Company is not currently subject to any material legal proceedings and, to the Company’s knowledge, no material legal proceedings are threatened against the Company. From time to time, the Company may be a party to certain legal proceedings in the ordinary course of business, including proceedings relating to the enforcement of the Company’s rights under contracts with its portfolio companies. While the outcome of any legal proceedings cannot be predicted with certainty, the Company does not expect that any such proceedings will have a material effect upon its financial condition or results of operations.

See Note 4 for a discussion of the Company’s commitments to FS/EIG Advisor and its affiliates (including FS Investments) and Note 7 for a discussion of the Company’s unfunded commitments.

Note 11. Financial Highlights

The following is a schedule of financial highlights of the Company for the nine months ended September 30, 2023 and the year ended December 31, 2022:

	Nine Months Ended September 30, 2023 (Unaudited)			Year Ended December 31, 2022
Per Share Data:(1)
Net asset value, beginning of period	$	3.88		$	3.59
Results of operations(2)
Net investment income	0.12			0.16
Net realized gain (loss) and unrealized appreciation (depreciation)	(0.30)			0.25
Net increase (decrease) in net assets resulting from operations	(0.18)			0.41
Shareholder distributions(3)
Distributions from net investment income	(0.06)			(0.12)
Net decrease in net assets resulting from shareholder distributions	(0.06)			(0.12)
Capital share transactions
Issuance of common shares(4)	—			—
Net increase (decrease) in net assets resulting from capital share transactions	—			—
Net asset value, end of period	$	3.64		$	3.88
Shares outstanding, end of period	455,506,234			451,465,673
Total return(5)	(4.70)		%	11.39		%
Total return (without assuming reinvestment of distributions)(5)	(4.64)		%	11.29		%
Ratio/Supplemental Data:
Net assets, end of period	$	1,657,461		$	1,753,748
Ratio of net investment income to average net assets(6)(7)	4.30		%	4.02		%
Ratio of total operating expenses to average net assets(6)	4.60		%	6.78		%
Ratio of management fee offset to average net assets(6)	(0.02)		%	(0.15)		%
Ratio of net operating expenses to average net assets(6)	4.58		%	6.63		%
Ratio of interest expense to average net assets(6)	1.47		%	3.21		%
Ratio of federal and state taxes to average net assets(6)	0.17		%	0.13		%
Portfolio turnover(8)	14.79		%	16.15		%
Total amount of senior securities outstanding, exclusive of treasury securities	$	80,000		$	762,751
Asset coverage per unit(9)	21.72			3.30

_________________________

(1)    Per share data may be rounded in order to recompute the ending net asset value per share.

(2)    The per share data was derived by using the weighted average shares outstanding during the applicable period.

(3)    The per share data for distributions reflects the actual amount of distributions paid per share during the applicable period.

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FS Specialty Lending Fund

Notes to Unaudited Consolidated Financial Statements (continued)

(in thousands, except share and per share amounts)

Note 11. Financial Highlights (continued)

(4)    The issuance of common shares on a per share basis reflects the incremental net asset value changes as a result of the issuance of common shares pursuant to the Company’s distribution reinvestment plan. The issuance of common shares at a price that is greater than the net asset value per share results in an increase in net asset value per share.

(5)    The total return for each period presented was calculated based on the change in net asset value during the applicable period, including the impact of distributions reinvested in accordance with the Company’s distribution reinvestment plan. Following the termination of the Company’s distribution reinvestment plan effective September 15, 2023, the total return for each period presented subsequent to the effective date was calculated based on the change in net asset value during the applicable period, assuming the reinvestment of all distributions at the Company’s net asset value per share as of the period end date. The total return (without assuming reinvestment of distributions) for each period presented was calculated by taking the net asset value per share as of the end of the applicable period, adding the cash distributions per share which were declared during the applicable period and dividing the total by the net asset value per share at the beginning of the applicable period. The total returns do not consider the effect of any sales commissions or charges that may be incurred in connection with the sale of the Company’s common shares. The total returns include the effect of the issuance of common shares at a net offering price that is greater than net asset value per share, which causes an increase in net asset value per share. The historical calculations of total returns in the table should not be considered representations of the Company’s future total returns, which may be greater or less than the returns shown in the table due to a number of factors, including the Company’s ability or inability to make investments in companies that meet its investment criteria, the interest rates payable on the debt securities the Company acquires, the level of the Company’s expenses, variations in and the timing of the recognition of realized and unrealized gains or losses, the degree to which the Company encounters competition in its markets and general economic conditions. As a result of these factors, results for any previous period should not be relied upon as being indicative of performance in future periods. The total return calculations set forth above represent the total returns on the Company’s investment portfolio during the applicable period and do not represent actual returns to shareholders.

(6)    Weighted average net assets during the applicable period are used for this calculation. Ratios for the nine months ended September 30, 2023 are annualized. Annualized ratios for the nine months ended September 30, 2023 are not necessarily indicative of the ratios that may be expected for the year ending December 31, 2023.

(7)    If FS/EIG Advisor had not agreed to offset the amount of any structuring, upfront or certain other fees it or its members received against the management fee payable by the Company, the ratio of net investment income to average net assets would have been 4.28% and 3.87% for the nine months ended September 30, 2023 and the year ended December 31, 2022, respectively. See Note 4 for a discussion of the management fee offset with FS/EIG Advisor.

(8)    Portfolio turnover for the nine months ended September 30, 2023 is not annualized.

(9)    Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

    (in thousands, except share and per share amounts)

The information contained in this section should be read in conjunction with our unaudited consolidated financial statements and related notes thereto included elsewhere in this quarterly report on Form 10-Q. In this report, "we," "us" and "our" refer to FS Specialty Lending Fund and "FS/EIG Advisor" refers to FS/EIG Advisor, LLC.

Forward-Looking Statements

Some of the statements in this quarterly report on Form 10-Q constitute forward-looking statements because they relate to future events or our future performance or financial condition. The forward-looking statements contained in this quarterly report on Form 10-Q may include statements as to:

•our future operating results;

•    our business prospects and the prospects of the companies in which we may invest, including our and their ability to achieve our respective objectives as a result of our board of trustees' approval of changes to our investment policy;

•    the impact of the investments that we expect to make;

•    the ability of our portfolio companies to achieve their objectives;

•    our current and expected financing arrangements and investments;

•changes in the general interest rate environment;

•    the adequacy of our cash resources, financing sources and working capital;

•    the timing and amount of cash flows, distributions and dividends, if any, from our portfolio companies;

•    our contractual arrangements and relationships with third parties;

•    actual and potential conflicts of interest with the other funds managed by FS/EIG Advisor, FS Investments, EIG, or any of their respective affiliates;

•    the dependence of our future success on the general economy and its effect on the industries in which we may invest;

•    general economic and political trends and other external factors, including the current COVID-19 pandemic and related disruptions caused thereby;

•    our use of financial leverage;

•    the ability of FS/EIG Advisor to locate suitable investments for us and to monitor and administer our investments;

•    the ability of FS/EIG Advisor or its affiliates to attract and retain highly talented professionals;

•    our transition from an investment policy of investing primarily in private U.S. energy and power companies to a diversified credit investment policy of investing across private and public credit in a broader set of industries, sectors and sub-sectors;

•    our distribution rate and intention to declare dividends, including with respect to the amount and timing of any such distributions;

•    our ability to maintain our qualification as a RIC and as a BDC;

•    the impact on our business of the Dodd-Frank Act, as amended, and the rules and regulations issued thereunder;

•    the effect of changes to tax legislation on us and the portfolio companies in which we may invest and our and their tax position; and

•    the tax status of the enterprises in which we may invest.

In addition, words such as “anticipate,” “believe,” “expect” and “intend” indicate a forward-looking statement, although not all forward-looking statements include these words. The forward-looking statements contained in this quarterly report on Form 10-Q involve risks and uncertainties. Our actual results could differ materially from those implied or expressed in the forward-looking statements for any reason, including the factors set forth in ‘‘Item 1A. Risk Factors.’’ Other factors that could cause actual results to differ materially include:

•    changes in the economy;

•    geo-political risks;

•    risks associated with possible disruption in our operations or the economy generally due to terrorism, natural disasters or pandemics;

•    future changes in laws or regulations and conditions in our operating areas; and

•    our ability to (i) transition to a diversified credit strategy within anticipated timeframes or at all, (ii) pay the targeted distributions, (iii) obtain the applied-for exemptive relief, (iv) obtain leverage on terms satisfactory to us and (v) achieve a liquidity event.

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The inclusion of forward-looking statements should not be regarded as a representation that any plans, estimates or expectations will be achieved. We have based the forward-looking statements included in this quarterly report on Form 10-Q on information available to us on the date of this quarterly report on Form 10-Q. Except as required by the federal securities laws, we undertake no obligation to revise or update any forward-looking statements, whether as a result of new information, future events or otherwise. Shareholders are advised to consult any additional disclosures that we may make directly to shareholders or through reports that we may file in the future with the SEC, including annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K. The forward-looking statements and projections contained in this quarterly report on Form 10-Q are excluded from the safe harbor protection provided by Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act.

Overview

We were formed as a Delaware statutory trust under the Delaware Statutory Trust Act on September 16, 2010 and formally commenced investment operations on July 18, 2011. We are an externally managed, non-diversified, closed-end management investment company that has elected to be regulated as a BDC under the 1940 Act and has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a RIC under Subchapter M of the Code. In November 2016, we closed our continuous public offering of common shares to new investors.

Our investment activities are managed by FS/EIG Advisor and supervised by our board of trustees, a majority of whom are independent. Under the FS/EIG investment advisory agreement, we have agreed to pay FS/EIG Advisor an annual base management fee based on the average weekly value of our gross assets and an incentive fee based on our performance.

On May 15, 2023, we announced that our board of trustees approved our transition from an investment policy of investing primarily in Energy companies to a diversified credit investment policy of investing across private and public credit in a broader set of industries, sectors and sub-sectors. We commenced transitioning our portfolio holdings away from Energy investments in May 2023, while remaining in compliance with our then-current investment policy. Following a shareholder notice period, the new policy became effective on September 29, 2023. Our allocation to Energy investments is expected to decline over time through the natural course of maturities, repayments and sales activity and by growing the total size of the portfolio through leverage facilities. The pace of the portfolio rotation is dependent upon a number of factors, including the turnover of concentrated illiquid Energy investments, performance of underlying portfolio companies, high yield and energy market conditions, our access to borrowings and the amount and pace of the payment of enhanced distributions to shareholders, among others.

Our current investment policy is to invest primarily in a portfolio of secured and unsecured floating and fixed rate loans, bonds and other types of credit instruments, which, under normal circumstances, will represent at least 80% of our total assets. This investment policy may not be changed without at least 60 days’ prior notice to holders of our common shares of any such change.

Our current investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation. We intend to pursue our investment objectives by investing in both direct originations and broadly syndicated investments of secured and unsecured floating and fixed rate loans, bonds and other types of credit instruments. Investing in both direct originations and broadly syndicated investments allows us to be dynamic in our pursuit of opportunities across changing economic and credit cycles. We intend to focus on the following investment categories in an effort to generate returns for our investors with an acceptable level of risk.

•    Direct Originations: Direct lending and innovative capital structure solutions to both sponsored and non-sponsored companies, typically based in the U.S. and operating within the middle market. These investments may include both debt and equity components.

•    Broadly Syndicated Loan and Bond Transactions: Opportunistic investments into primary and secondary market, broadly syndicated loans and bonds. Broadly syndicated loans and bonds are generally more liquid than our directly originated investments and provide a complement to our less liquid strategies.

In the case of broadly syndicated investments, we generally intend to capitalize on market inefficiencies by investing in loans, bonds, and other asset classes where the market price of such investment reflects a lower value than we believe is warranted based on our fundamental analysis, providing us with an opportunity to earn an attractive return on our investment.

However, we may pursue other investment opportunities if we believe they are in our best interests and consistent with our investment objectives.

Prior to September 29, 2023, our investment policy was to invest, under normal circumstances, at least 80% of our total assets in securities of Energy companies and our investment objectives were to generate current income and long-term capital appreciation. We pursued our previous investment objectives by focusing on the following seven investment themes: (i) basin-on-basin competition in U.S. shale, (ii) globalization of natural gas, (iii) coal retirements and the evolving energy generation mix, (iv) renewables focused on power grid parity, (v) export infrastructure for emerging U.S. producers, (vi) market liberalization opening new markets and (vii) midstream infrastructure connecting new supplies. However, we could pursue other investment opportunities if we believed they were in our best interests and consistent with our then-current investment objectives.

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The majority of our portfolio is comprised of income-oriented securities, which principally refers to debt securities and income-oriented preferred and common equity interests, of privately-held Energy companies within the United States although we expect our portfolio to shift away from investments in privately-held Energy companies as we transition to a diversified credit strategy. Generally, in the long-term we expect to invest primarily in directly originated investments and primary market transactions, as this will provide us with the ability to tailor investments to best match a project’s or company’s needs with our investment objectives. We intend to weight our portfolio towards senior secured debt, which we believe offers opportunities for superior risk-adjusted returns and income generation. Our debt investments may take the form of corporate or project loans or bonds, may be secured or unsecured and may, in some cases, be accompanied by yield enhancements. These yield enhancements are typically expected to include warrants, options, net profits interests, cash flow participations or other forms of equity participation that can provide additional consideration or “upside” in a transaction. A portion of our portfolio may be comprised of derivatives, including the use of total return swaps, credit default swaps and other commodity swap contracts. In connection with certain of our debt investments or any restructuring of these debt investments, we may on occasion receive equity interests, including warrants or options, as additional consideration or otherwise in connection with a restructuring. FS/EIG Advisor will seek to tailor our investment focus as market conditions evolve.

Our future financial condition, results of operations and cash flows may be impacted by the transition to a new investment policy.

Revenues

The principal measure of our financial performance is net increase or decrease in net assets resulting from operations, which includes net investment income, net realized gain or loss on investments, foreign currency, swap contracts and debt extinguishment, net change in unrealized appreciation or depreciation on investments, net change in unrealized gain or loss on foreign currency and net change in unrealized appreciation or depreciation on swap contracts. Net investment income is the difference between our income from interest, dividends, fees and other investment income and our operating and other expenses. Net realized gain or loss on investments is the difference between the proceeds received from dispositions of portfolio investments and their amortized cost, including the respective realized gain or loss on foreign currency for those foreign denominated investment transactions. Net realized gain or loss on foreign currency is the portion of realized gain or loss attributable to foreign currency fluctuations. Net realized gain or loss on swap contracts is the portion of realized gain or loss attributable to the difference between the fixed price specified in the contract and the referenced settlement price. Net change in unrealized appreciation or depreciation on investments is the net change in the fair value of our investment portfolio, including the respective unrealized gain or loss on foreign currency for those foreign denominated investments. Net change in unrealized gain or loss on foreign currency is the net change in the value of receivables or accruals due to the impact of foreign currency fluctuations. Net change in unrealized appreciation or depreciation on swap contracts is the net change in the value of receivables or accruals due to the impact of the difference between the fixed price specified in the contract and the referenced settlement price.

We principally generate revenues in the form of interest income on the debt investments we hold. We also generate revenues in the form of dividends and other distributions on the equity or other securities we may hold. In addition, we may generate revenues in the form of non-recurring commitment, closing, origination, structuring or diligence fees, fees for providing managerial assistance, consulting fees, prepayment fees and performance-based fees.

Expenses

Our primary operating expenses include the payment of management and incentive fees and other expenses under the FS/EIG investment advisory agreement, interest expense from financing arrangements and other indebtedness, and other expenses necessary for our operations. The management and incentive fees compensate FS/EIG Advisor for its work in identifying, evaluating, negotiating, executing, monitoring and servicing our investments.

FS/EIG Advisor oversees our day-to-day operations, including the provision of general ledger accounting, fund accounting, legal services, investor relations, certain government and regulatory affairs activities, and other administrative services. FS/EIG Advisor also performs, or oversees the performance of, our corporate operations and required administrative services, which includes being responsible for the financial records that we are required to maintain and preparing reports for our shareholders and reports filed with the SEC. In addition, FS/EIG Advisor assists us in calculating our net asset value, overseeing the preparation and filing of tax returns and the printing and dissemination of reports to our shareholders, and generally overseeing the payment of our expenses and the performance of administrative and professional services rendered to us by others.

We reimburse FS/EIG Advisor for expenses necessary to perform services related to our administration and operations, including FS/EIG Advisor’s allocable portion of the compensation and related expenses of certain personnel of FS Investments and EIG providing administrative services to us on behalf of FS/EIG Advisor, and for transactional expenses for prospective investments, such as fees and expenses associated with performing due diligence reviews of investments that do not close, often referred to as "broken deal" costs. We reimburse FS/EIG Advisor no less than quarterly for all costs and expenses incurred by FS/EIG Advisor in performing its obligations and providing personnel under the FS/EIG investment advisory agreement. The amount of this reimbursement is set at the lesser of (1) FS/EIG Advisor’s actual costs incurred in providing such services and (2) the amount that we estimate would be required to pay alternative service providers for comparable services in the same geographic location. FS/EIG

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Advisor allocates the cost of such services to us based on factors such as time allocations and other reasonable metrics. Our board of trustees reviews the methodology employed in determining how the expenses are allocated to us and assesses the reasonableness of such reimbursements for expenses allocated to us based on the breadth, depth and quality of such services as compared to the estimated cost to us of obtaining similar services from third-party service providers known to be available. In addition, our board of trustees considers whether any single third-party service provider would be capable of providing all such services at comparable cost and quality. Finally, our board of trustees compares the total amount paid to FS/EIG Advisor for such services as a percentage of our net assets to the same ratio as reported by other comparable BDCs. We do not reimburse FS/EIG Advisor for any services for which it receives a separate fee, or for rent, depreciation, utilities, capital equipment or other administrative items allocated to a controlling person of FS/EIG Advisor.

We bear all other expenses of our operations and transactions, including all other expenses incurred by FS/EIG Advisor in performing services for us and administrative personnel paid by FS/EIG Advisor, to the extent they are not controlling persons of FS/EIG Advisor or any of its affiliates, subject to the limitations included in the FS/EIG investment advisory agreement.

In addition, we have contracted with State Street to provide various accounting and administrative services, including, but not limited to, preparing preliminary financial information for review by FS/EIG Advisor, preparing and monitoring expense budgets, maintaining accounting and corporate books and records, processing trade information provided by us and performing testing with respect to RIC compliance.

For information regarding the fee offset with FS/EIG Advisor, see Note 4 to our unaudited consolidated financial statements included herein.

Energy Market Developments

Events in recent years such as global lockdowns and ongoing negotiations regarding production levels between oil producing countries, have, at times, resulted in lower demand for crude oil and, as a result, lower commodity prices. Although the energy markets have had a notable recovery since 2021, volatility in the energy markets may persist, recur or worsen, as a result of these events or other macroeconomic events, such as the current conflict in Ukraine and sanctions imposed on Russia in response. The impact of these events on the U.S. and global economies (including energy markets), has negatively impacted, and could continue to negatively impact, the business operations of some of our portfolio companies. Many of our portfolio companies are performing well, and energy markets are currently experiencing relatively stable conditions. However, we expect that certain of our portfolio companies may continue to experience economic distress for the foreseeable future and could become insolvent or otherwise significantly limit business operations if subjected to prolonged economic distress, including as a result of depressed commodity prices or other declines in the energy markets. These developments could result in a further decrease in the value of our investments.

These events have previously had adverse effects on our investment income and we expect that such adverse effects may continue for some time. These adverse effects have required and may again require us to restructure certain of our investments, which could result in further reductions to our investment income or in impairments on our investments. In addition, disruptions in the capital markets have resulted in illiquidity in certain market areas at times. These market disruptions and illiquidity have had and may continue to have an adverse effect on our business, financial condition, results of operations and cash flows. Unfavorable economic conditions caused by these events may increase our funding costs and limit our access to the capital markets. These events have previously limited our investment originations, which may continue for the immediate future, and have also previously had a material negative impact on our operating results for a period of time. In addition, the growth of non-income producing equity investments as a percentage of the portfolio has materially reduced the value of collateral available to secure our financing arrangements. Consequently, this has adversely impacted our liquidity, may cause us to fall out of compliance with certain portfolio requirements under the 1940 Act that are tied to the value of our investments and, in each case, may continue to do so in the future.

In light of such difficult market conditions and in an effort to preserve our liquidity, our board of trustees determined to suspend for an indefinite period of time our share repurchase program and will reassess our ability to recommence such program in future periods. We expect to provide enhanced quarterly distributions to shareholders commencing in October 2023 at an annualized distribution rate of approximately 7.5% based on our estimated net asset value at the time of declaration and increasing in subsequent years until the achievement of a long-term liquidity event, subject to a maximum cap of 15% of the then-current estimated net asset value beyond 2026. FS/EIG Advisor and our board of trustees expect that future regular cash distributions to shareholders will remain suspended until such time that our board of trustees and FS/EIG Advisor believe that market conditions and our financial condition support the resumption of such distributions. Our board of trustees has and will continue to evaluate our ability to pay any distributions in the future. There can be no assurance that we will be able to pay distributions in the future. The timing and amount of any future distributions to shareholders are subject to applicable legal restrictions and the sole discretion of our board of trustees.

We will continue to carefully monitor the energy markets and any other new or ongoing events that may affect our business and the business of our portfolio companies, including the current conflict in Ukraine and government responses thereto. Because the full effects of these events are not capable of being known at this time, we cannot estimate the impacts on our future financial condition, results of operations or cash flows.

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Portfolio Investment Activity for the Three and Nine Months Ended September 30, 2023 and for the Year Ended December 31, 2022

Total Portfolio Activity

The following tables present certain selected information regarding our portfolio investment activity for the three and nine months ended September 30, 2023:

Net Investment Activity	For the Three Months Ended September 30, 2023				For the Nine Months Ended September 30, 2023
Purchases	$	165,431			$	256,755
Sales and Repayments	(128,792)				(688,966)
Net Portfolio Activity	$	36,639			$	(432,211)
	For the Three Months Ended September 30, 2023				For the Nine Months Ended September 30, 2023
New Investment Activity by Asset Class	Purchases		Percentage		Purchases		Percentage
Senior Secured Loans—First Lien	$	155,962	94	%	$	229,913	90	%
Senior Secured Bonds	9,306		6	%	23,312		9	%
Equity/Other	163		0	%	3,530		1	%
Total	$	165,431	100	%	$	256,755	100	%

The following table summarizes the composition of our investment portfolio at cost and fair value as of September 30, 2023 and December 31, 2022:

	September 30, 2023 (Unaudited)						December 31, 2022
	Amortized Cost(1)		Fair Value		Percentage of Portfolio		Amortized Cost(1)		Fair Value		Percentage of Portfolio
Senior Secured Loans—First Lien	$	675,016	$	631,307	42	%	$	702,842	$	706,646	35	%
Senior Secured Loans—Second Lien	70,267		69,599		5	%	143,153		143,270		7	%
Senior Secured Bonds	33,385		32,681		2	%	10,064		10,074		0	%
Unsecured Debt	108,367		109,302		7	%	253,675		241,418		12	%
Preferred Equity	252,450		259,205		18	%	425,182		400,414		20	%
Sustainable Infrastructure Investments, LLC	54,514		49,192		3	%	54,514		51,098		2	%
Equity/Other	259,083		341,480		23	%	333,510		494,195		24	%
Total	$	1,453,082	$	1,492,766	100	%	$	1,922,940	$	2,047,115	100	%

_________________________

(1)    Amortized cost represents the original cost adjusted for the amortization of premiums and/or accretion of discounts, as applicable, on investments.

The following table presents certain selected information regarding the composition of our investment portfolio as of September 30, 2023 and December 31, 2022:

	September 30, 2023	December 31, 2022
Number of Portfolio Companies	56	63
% Variable Rate (based on fair value)	44.1%	36.8%
% Fixed Rate (based on fair value)	12.4%	17.0%
% Income Producing Preferred Equity and Equity/Other Investments (based on fair value)	23.5%	28.9%
% Non-Income Producing Preferred Equity and Equity/Other Investments (based on fair value)	20.0%	17.3%
Weighted Average Purchase Price of Debt Investments (as a % of par value)	88.1%	97.5%
% of Investments on Non-Accrual (based on fair value)	13.1%	10.8%
Gross Portfolio Yield Prior to Leverage (based on amortized cost)	7.9%	7.3%
Gross Portfolio Yield Prior to Leverage (based on amortized cost)—Excluding Non-Income Producing Assets	11.2%	9.3%

We expect to provide enhanced quarterly distributions to shareholders commencing in October 2023 at an annualized distribution rate of approximately 7.5% based on our estimated net asset value at the time of declaration and increasing in subsequent years until the achievement of a long-term liquidity event, subject to a maximum cap of 15% of the then-current estimated net asset value beyond 2026. We expect a portion of the distributions may represent a return of investor capital, helping to accelerate liquidity

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for shareholders in the near-term. FS/EIG Advisor and our board of trustees expect that future regular cash distributions to shareholders will remain suspended until such time that our board of trustees and FS/EIG Advisor believe that market conditions and our financial condition support the resumption of such distributions. Our board of trustees has and will continue to evaluate our ability to pay any distributions in the future. There can be no assurance that we will be able to pay distributions in the future. The timing and amount of any future distributions to shareholders are subject to applicable legal restrictions and the sole discretion of our board of trustees. For the nine months ended September 30, 2023 and the year ended December 31, 2022, our total return was (4.70)% and 11.39%, respectively, and our total return without assuming reinvestment of distributions was (4.64)% and 11.29%, respectively.

Our estimated gross portfolio yield does not represent actual investment returns to shareholders. Our gross annual portfolio yield is subject to change and in the future may be greater or less than the rates set forth above. See the sections entitled “Risk Factors” in our annual report on Form 10-K for the fiscal year ended December 31, 2022 and in our other periodic reports filed with the SEC for a discussion of the uncertainties, risks and assumptions associated with these statements.

Direct Originations

We define Direct Originations as any investment where FS/EIG Advisor or its affiliates negotiate the terms of the transaction beyond just the price, which, for example, may include negotiating financial covenants, maturity dates or interest rate terms. These Direct Originations include participation in other originated transactions where there may be third parties involved, or a bank acting as an intermediary, for a closely held club, or similar transactions.

The following table presents certain selected information regarding our Direct Originations as of September 30, 2023 and December 31, 2022:

Characteristics of All Direct Originations held in Portfolio	September 30, 2023	December 31, 2022
Number of Portfolio Companies	32	40
% of Investments on Non-Accrual (based on fair value)	17.3%	14.4%
Total Cost of Direct Originations	$1,068,114	$1,387,547
Total Fair Value of Direct Originations	$1,125,005	$1,537,417
% of Total Investments, at Fair Value	75.4%	75.1%
Gross Portfolio Yield Prior to Leverage (based on amortized cost) of Funded Direct Originations	7.0%	6.8%
Gross Portfolio Yield Prior to Leverage (based on amortized cost) of Funded Direct Originations—Excluding Non-Income Producing Assets	11.5%	9.7%

Portfolio Composition by Strategy

The table below summarizes the composition of our investment portfolio by strategy and enumerates the percentage, by fair value, of the total portfolio assets in such strategies as of September 30, 2023 and December 31, 2022:

	September 30, 2023				December 31, 2022
Portfolio Composition by Strategy	Fair Value		Percentage of Portfolio		Fair Value		Percentage of Portfolio
Direct Originations	$	1,125,005	75	%	$	1,537,417	75	%
Broadly Syndicated/Other	367,761		25	%	509,698		25	%
Total	$	1,492,766	100	%	$	2,047,115	100	%

See Note 7 to our unaudited consolidated financial statements included herein for additional information regarding our investment portfolio.

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Portfolio Asset Quality

In addition to various risk management and monitoring tools, FS/EIG Advisor uses an investment rating system to characterize and monitor the expected level of returns on each investment in our portfolio. FS/EIG Advisor uses an investment rating scale of 1 to 5. The following is a description of the conditions associated with each investment rating:

Investment Rating	Summary Description
1	Investment exceeding expectations and/or capital gain expected.
2	Performing investment generally executing in accordance with the portfolio company’s business plan—full return of principal and interest expected.
3	Performing investment requiring closer monitoring.
4	Underperforming investment—some loss of interest or dividend possible, but still expecting a positive return on investment.
5	Underperforming investment with expected loss of interest and some principal.

The following table shows the distribution of our investments on the 1 to 5 investment rating scale at fair value as of September 30, 2023 and December 31, 2022:

	September 30, 2023				December 31, 2022
Investment Rating	Fair Value		Percentage of Portfolio		Fair Value		Percentage of Portfolio
1	$	—	—		$	—	—
2	1,038,120		70	%	1,426,668		70	%
3	171,663		11	%	336,097		16	%
4	213,388		14	%	255,580		13	%
5	69,595		5	%	28,770		1	%
Total	$	1,492,766	100	%	$	2,047,115	100	%

The amount of the portfolio in each grading category may vary substantially from period to period resulting primarily from changes in the composition of the portfolio as a result of new investment, repayment and exit activities. In addition, changes in the grade of investments may be made to reflect our expectation of performance and changes in investment values.

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Results of Operations

Comparison of the Three and Nine Months Ended September 30, 2023 and 2022

Revenues

Our investment income for the three and nine months ended September 30, 2023 and 2022 was as follows:

	Three Months Ended September 30,								Nine Months Ended September 30,
	2023				2022				2023				2022
	Amount		Percentage of Total Income		Amount		Percentage of Total Income		Amount		Percentage of Total Income		Amount		Percentage of Total Income
Interest income	$	27,180	89	%	$	33,449	82	%	$	84,371	73	%	$	87,351	71	%
Paid-in-kind interest income	2,343		8	%	5,799		14	%	14,174		12	%	18,268		15	%
Fee income	586		2	%	1,061		3	%	1,712		2	%	11,520		9	%
Dividend income	334		1	%	479		1	%	14,757		13	%	6,631		5	%
Total investment income(1)	$	30,443	100	%	$	40,788	100	%	$	115,014	100	%	$	123,770	100	%

_____________________________

(1)     Such revenues represent $26,728 and $33,449 of cash income earned as well as $3,715 and $7,339 in non-cash portions relating to accretion of discount and PIK interest for the three months ended September 30, 2023 and 2022, respectively, and represent $96,356 and $100,076 of cash income earned as well as $18,658 and $23,694 in non-cash portions relating to accretion of discount and PIK interest for the nine months ended September 30, 2023 and 2022, respectively. Cash flows related to such non-cash revenues may not occur for a number of reporting periods or years after such revenues are recognized.

The level of interest income we receive is generally related to the balance of income-producing investments multiplied by the weighted average yield of our investments. We may experience volatility in the amount of interest income that we earn as the accrual status of existing portfolio investments may fluctuate due to restructuring activity in the portfolio.

The decrease in the amount of interest income for the three and nine months ended September 30, 2023 compared to the three and nine months ended September 30, 2022 was primarily due to a combination of factors including an overall decrease in the size of the investment portfolio and certain investments being placed on non-accrual.

Fee income is transaction based, and typically consists of prepayment fees and structuring fees. As such, future fee income is generally dependent on new direct origination investments and the occurrence of events at existing portfolio companies resulting in such fees. The decrease in the amount of fee income for the three and nine months ended September 30, 2023 compared to the three and nine months ended September 30, 2022 was primarily due to the decrease in prepayment activity during the period.

The increase in the amount of dividend income for the nine months ended September 30, 2023 compared to the nine months ended September 30, 2022 was primarily due to the increase in dividends paid with respect to our investments in certain common equities.

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Expenses

Our operating expenses for the three and nine months ended September 30, 2023 and 2022 were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Management fees	$	7,778	$	11,350	$	26,957	$	33,361
Administrative services expenses	1,887		1,695		4,566		4,605
Share transfer agent fees	820		768		2,365		2,216
Accounting and administrative fees	82		369		444		735
Interest expense	738		14,104		19,066		40,994
Trustees' fees	163		161		503		578
Expenses associated with our independent audit and related fees	142		213		406		436
Legal fees	708		101		945		251
Printing fees	287		73		512		482
Other	349		455		1,661		1,333
Total operating expenses	12,954		29,289		57,425		84,991
Less: Management fee offset	(63)		(208)		(337)		(2,606)
Net operating expenses before taxes	12,891		29,081		57,088		82,385
Federal and state taxes	834		17		2,150		669
Total net expenses, including federal and state taxes	$	13,725	$	29,098	$	59,238	$	83,054

The following table reflects selected expense ratios as a percent of average net assets for the three and nine months ended September 30, 2023 and 2022 (not annualized):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Ratio of operating expenses and federal and state taxes to average net assets	0.81	%	1.62	%	3.45	%	4.96	%
Ratio of management fee offset to average net assets	0.00	%	(0.01)	%	(0.02)	%	(0.15)	%
Ratio of net operating expenses and federal and state taxes to average net assets	0.81	%	1.61	%	3.43	%	4.81	%
Ratio of interest expense and federal and state taxes to average net assets	(0.09)	%	(0.78)	%	(1.23)	%	(2.41)	%
Ratio of net operating expenses, excluding certain expenses, to average net assets	0.72	%	0.83	%	2.20	%	2.40	%

Interest expense may increase or decrease our expense ratios relative to comparative periods depending on changes in benchmark interest rates such as LIBOR or SOFR, utilization rates and the terms of our financing arrangements, among other factors.

Management Fee Offset

Structuring, upfront or certain other fees received by FS/EIG Advisor or its members which were offset against management fees due to FS/EIG Advisor from us were $63 and $208 for the three months ended September 30, 2023 and 2022, respectively, and $337 and $2,606 for the nine months ended September 30, 2023 and 2022, respectively. See Note 4 to our unaudited consolidated financial statements contained in this quarterly report on Form 10-Q for a discussion of the management fee offset for the three and nine months ended September 30, 2023 and 2022.

Net Investment Income

Our net investment income totaled $16,718 ($0.04 per share) and $11,690 ($0.03 per share) for the three months ended September 30, 2023 and 2022, respectively, and $55,776 ($0.12 per share) and $40,716 ($0.09 per share) for the nine months ended September 30, 2023 and 2022, respectively.

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Net Realized Gains or Losses

Our net realized gains (losses) on investments, foreign currency, swap contracts and debt extinguishment for the three and nine months ended September 30, 2023 and 2022, were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Net realized gain (loss) on investments(1)	$	6,390	$	5,310	$	(56,305)	$	36,770
Net realized gain (loss) on foreign currency	(3)		(202)		(123)		(202)
Net realized gain (loss) on swap contracts	(138)		(812)		88		(2,620)
Net realized gain (loss) on debt extinguishment	—		—		—		(929)
Total net realized gain (loss)	$	6,249	$	4,296	$	(56,340)	$	33,019

_________________________

(1)    We sold investments and received principal repayments of $52,594 and $76,198, respectively, during the three months ended September 30, 2023 and $30,220 and $115,045, respectively, during the three months ended September 30, 2022. We sold investments and received principal repayments of $356,811 and $332,155, respectively, during the nine months ended September 30, 2023 and $300,911 and $351,756, respectively, during the nine months ended September 30, 2022.

Net Change in Unrealized Appreciation (Depreciation)

Our net change in unrealized appreciation (depreciation) on investments, swap contracts and foreign currency for the three and nine months ended September 30, 2023 and 2022 were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Net change in unrealized appreciation (depreciation) on investments	$	(49,580)	$	(70,610)	$	(84,491)	$	80,592
Net change in unrealized appreciation (depreciation) on swap contracts	(803)		3,582		400		(6)
Net change in unrealized appreciation (depreciation) on foreign currency	(7)		(59)		27		(59)
Total net change in unrealized appreciation (depreciation)	$	(50,390)	$	(67,087)	$	(84,064)	$	80,527

During the three and nine months ended September 30, 2023, the net change in unrealized appreciation (depreciation) on our investments was primarily driven by the performance of our directly originated assets. During the three and nine months ended September 30, 2022, the net change in unrealized appreciation (depreciation) on our investments was primarily driven by the performance of our directly originated assets and certain of our upstream equity/other investments and the conversion of unrealized appreciation to realized gains.

Net Increase (Decrease) in Net Assets Resulting from Operations

For the three months ended September 30, 2023 and 2022, the net increase (decrease) in net assets resulting from operations was $(27,423) ($(0.06) per share) and $(51,101) ($(0.11) per share), respectively. For the nine months ended September 30, 2023 and 2022, the net increase (decrease) in net assets resulting from operations was $(84,628) ($(0.19) per share) and $154,262 ($0.34 per share), respectively.

This “Results of Operations” section should be read in conjunction with “Energy Market Developments” above.

Financial Condition, Liquidity and Capital Resources

Overview

As of September 30, 2023, we had $289,738 in cash, which we held in custodial accounts and $420,000 in borrowings available under the Barclays Facility. As of September 30, 2023, we also had broadly syndicated investments that could be sold to create additional liquidity. As of September 30, 2023, we had three senior secured loan investments with aggregate unfunded commitments of $6,741 and unfunded commitments of $7,625 in U.S. dollars and $858 in Canadian dollars to contribute capital to Sustainable Infrastructure Investments, LLC. We maintain sufficient cash on hand, available borrowings and/or liquid securities to fund such unfunded commitments and other contractual commitments should the need arise.

We generate cash primarily from fees, interest and dividends earned from our investments as well as principal repayments and proceeds from sales of our investments. To seek to enhance our returns, we may also seek to employ leverage as market conditions permit and at the discretion of FS/EIG Advisor, but unless and until we elect otherwise, as permitted by the 1940 Act, in no event will leverage employed exceed 50% of the value of our assets, as required by the 1940 Act.

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Prior to investing in securities of portfolio companies, we invest the net proceeds from sales and paydowns of existing investments primarily in cash, cash equivalents, including money market funds, U.S. government securities, repurchase agreements and high-quality debt instruments maturing in one year or less from the time of investment, consistent with our BDC election and our election to be taxed as a RIC.

In light of difficult market conditions, we took several steps in 2020 to seek to enhance our liquidity by, among other things, suspending our share repurchase program, suspending regular cash distributions and reducing leverage by paying down borrowings. The share repurchase program and regular cash distributions currently remain suspended.

This “Financial Condition, Liquidity and Capital Resources” section should be read in conjunction with “Energy Market Developments” above and “—Financing Arrangements” below.

Financing Arrangements

The following table presents a summary of information with respect to our outstanding financing arrangements as of September 30, 2023:

Arrangement(1)	Type of Arrangement	Rate(2)	Amount Outstanding		Amount Available		Maturity Date
Barclays Facility	Repurchase	Term SOFR+3.42%	$	80,000	$	420,000	September 6, 2026
Total			$	80,000	$	420,000

______________________

(1)    The carrying amount outstanding under the facility approximates its fair value, unless otherwise noted.

(2)    The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the Collateral Obligations (such individual margins ranging from 1.90% to 4.20%, depending on the type of Collateral Obligations; subject to a floor, in the aggregate, of 3.00%).

For additional information regarding our financing arrangements, see Note 9 to our unaudited consolidated financial statements included herein.

RIC Tax Treatment and Distributions

We have elected to be treated for U.S. federal income tax purposes, and intend to qualify annually, as a RIC under Subchapter M of the Code. As a RIC, we generally do not have to pay corporate-level U.S. federal income taxes on any ordinary income or capital gains that we distribute as dividends to our shareholders. To maintain our qualification as a RIC, we must, among other things, meet certain source-of-income and asset diversification requirements. In addition, in order to maintain RIC tax treatment, we must distribute to our shareholders, for each tax year, dividends generally of an amount at least equal to 90% of our “investment company taxable income,” which is generally the sum of our net ordinary income plus the excess, if any, of realized net short-term capital gains over realized net long-term capital losses, determined without regard to any deduction for dividends paid. In addition, we may, in certain cases, satisfy the Annual Distribution Requirement by distributing dividends relating to a tax year after the close of such tax year under the “spillover dividend” provisions of Subchapter M of the Code. If we distribute a spillover dividend, such dividend will be included in a shareholder’s gross income for the tax year in which the spillover distribution is paid. We intend to make sufficient distributions to our shareholders to maintain our RIC tax treatment each tax year. We will also be subject to nondeductible U.S. federal excise taxes on certain undistributed income unless we distribute in a timely manner to our shareholders of an amount at least equal to the sum of (1) 98% of our net ordinary taxable income (taking into account certain deferrals and elections) for the calendar year, (2) 98.2% of our capital gain net income, which is the excess of capital gains over capital losses (adjusted for certain ordinary losses), for the one-year period ending October 31 of that calendar year and (3) 100% of any ordinary income and capital gain net income recognized for the preceding years that were not distributed during such years and on which we paid no U.S. federal income tax. Any distribution declared by us during October, November or December of any calendar year, payable to our shareholders of record on a specified date in such a month and actually paid during January of the following calendar year, will be treated as if it had been paid by us, as well as received by our U.S. shareholders, on December 31 of the calendar year in which the distribution was declared.

In general, when we pay regular cash distributions, we intend to declare them on a quarterly or monthly basis and pay them on a monthly basis. We will calculate each shareholder’s specific distribution amount for the period using record and declaration dates and each shareholder’s distributions will begin to accrue on the date that common shares are issued to such shareholder. From time to time, we may also pay special interim distributions in the form of cash or common shares at the discretion of our board of trustees. The timing and amount of any future distributions to shareholders are subject to applicable legal restrictions and the sole discretion of our board of trustees.

Our distribution proceeds have exceeded and in the future may exceed our earnings. Therefore, portions of the distributions that we have made represented, and may make in the future may represent, a return of capital to shareholders, which lowers their tax basis in their common shares. A return of capital generally is a return of an investor’s investment rather than a return of earnings or gains derived from our investment activities and will be made after deducting the fees and expenses payable in connection with our

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continuous public offering, including any fees payable to FS/EIG Advisor. Moreover, a return of capital will generally not be taxable, but will reduce each shareholder’s cost basis in our common shares, and will result in a higher reported capital gain or lower reported capital loss when the common shares on which such return of capital was received are sold. Each year a statement on Form 1099-DIV identifying the sources of the distributions will be mailed to our shareholders.

We intend to make any regular distributions in the form of cash, out of assets legally available for distribution. Prior to September 15, 2023, shareholders could elect to receive their cash distributions in additional common shares under our distribution reinvestment plan. Any distributions reinvested under the plan nevertheless remained taxable to a U.S. shareholder. Our distribution reinvestment plan was terminated effective as of September 15, 2023.

We expect to provide enhanced quarterly distributions to shareholders commencing in October 2023 at an annualized distribution rate of approximately 7.5% based on our estimated net asset value at the time of declaration and increasing in subsequent years until the achievement of a long-term liquidity event, subject to a maximum cap of 15% of the then-current estimated net asset value beyond 2026. We expect a portion of the distributions may represent a return of investor capital, helping to accelerate liquidity for shareholders in the near-term. FS/EIG Advisor and our board of trustees expect that future regular cash distributions to shareholders will remain suspended until such time that our board of trustees and FS/EIG Advisor believe that market conditions and our financial condition support the resumption of such distributions. Our board of trustees has and will continue to evaluate our ability to pay any distributions in the future. There can be no assurance that we will be able to pay distributions in the future. The timing and amount of any future distributions to shareholders are subject to applicable legal restrictions and the sole discretion of our board of trustees.

The following table reflects the cash distributions per share that we have declared on our common shares during the nine months ended September 30, 2023 and 2022:

	Distribution
For the Three Months Ended	Per Share		Amount
Fiscal 2022
March 31, 2022	$	0.03	$	13,426
June 30, 2022	0.03		13,465
September 30, 2022	0.03		13,504
Total	$	0.09	$	40,395
Fiscal 2023
March 31, 2023	$	0.03	$	13,584
June 30, 2023	0.03		13,624
September 30, 2023	—		—
Total	$	0.06	$	27,208

See Note 5 to our unaudited consolidated financial statements included herein for additional information regarding our distributions.

Critical Accounting Policies and Estimates

Our financial statements are prepared in conformity with GAAP, which requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Management has utilized available information, including our past history, industry standards and the current economic environment, among other factors, in forming the estimates and judgments, giving due consideration to materiality. Actual results may differ from these estimates. In addition, other companies may utilize different estimates, which may impact the comparability of our results of operations to those of companies in similar businesses. Understanding our accounting policies and the extent to which we use management judgment and estimates in applying these policies is integral to understanding our financial statements. We describe our most significant accounting policies in Note 2 to our unaudited consolidated financial statements included herein. Critical accounting policies are those that require the application of management’s most difficult, subjective or complex judgments, often because of the need to make estimates about the effect of matters that are inherently uncertain and that may change in subsequent periods. We evaluate our critical accounting estimates and judgments required by our policies on an ongoing basis and update them as necessary based on changing conditions. We have identified one of our accounting policies, valuation of portfolio investments, as critical because it involves significant judgments and assumptions about highly complex and inherently uncertain matters, and the use of reasonably different estimates and assumptions could have a material impact on our reported results of operations or financial condition. As we execute our operating plans, we will describe additional critical accounting policies in the notes to our future financial statements in addition to those discussed below.

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Valuation of Portfolio Investments

Our board of trustees is responsible for overseeing the valuation of our portfolio investments at fair value as determined in good faith pursuant to FS/EIG Advisor’s valuation policy. As permitted by Rule 2a-5 of the 1940 Act, our board of trustees has designated FS/EIG Advisor as our valuation designee, with day-to-day responsibility for implementing the portfolio valuation process set forth in FS/EIG Advisor’s valuation policy.

Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosure, or ASC Topic 820, issued by the Financial Accounting Standards Board, or the FASB, clarifies the definition of fair value and requires companies to expand their disclosure about the use of fair value to measure assets and liabilities in interim and annual periods subsequent to initial recognition. ASC Topic 820 defines fair value as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820 also establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical securities; Level 2, which includes inputs such as quoted prices for similar securities in active markets and quoted prices for identical securities where there is little or no activity in the market; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions.

FS/EIG Advisor determines the fair value of our investment portfolio each quarter. Securities that are publicly-traded with readily available market prices will be valued at the reported closing price on the valuation date. Securities that are not publicly-traded with readily available market prices will be valued at fair value as determined in good faith by FS/EIG Advisor. In connection with that determination, FS/EIG Advisor will prepare portfolio company valuations which are based on relevant inputs, including, but not limited to, indicative dealer quotes, values of like securities, recent portfolio company financial statements and forecasts, and valuations prepared by independent third-party pricing and valuation services.

With respect to investments for which market quotations are not readily available, a multi-step valuation process is undertaken each quarter, as described below:

•our quarterly fair valuation process begins with FS/EIG Advisor facilitating the delivery of updated quarterly financial and other information relating to each investment to an independent third-party pricing or valuation service;

•the independent third-party pricing or valuation service then reviews and analyzes the information, along with relevant market and economic data, and determines proposed valuations for each portfolio company or investment according to the valuation methodologies in FS/EIG Advisor’s valuation policy and communicates the information to FS/EIG Advisor in the form of a valuation range for Level 3 assets;

•FS/EIG Advisor then reviews the preliminary valuation information for each portfolio company or investment and provides feedback about the accuracy, completeness and timeliness of the valuation-related inputs considered by the independent third-party pricing or valuation service and any suggested revisions thereto prior to the independent third-party pricing or valuation service finalizing its valuation range;

•FS/EIG Advisor then provides the valuation committee with its valuation determinations and valuation-related information for each portfolio company or investment, along with any applicable supporting materials; and other information that is relevant to the fair valuation process as required by FS/EIG Advisor’s board reporting obligations; 

•the valuation committee meets with FS/EIG Advisor to receive the relevant quarterly reporting from FS/EIG Advisor and to discuss any questions from the valuation committee in connection with the valuation committee’s role in overseeing the fair valuation process; and

•following the completion of its fair value oversight activities, the valuation committee (with the assistance of FS/EIG Advisor) provides our board of trustees with a report regarding the quarterly valuation process.

Determination of fair value involves subjective judgments and estimates. Accordingly, the notes to our consolidated financial statements refer to the uncertainty with respect to the possible effect of such valuations and any change in such valuations on our consolidated financial statements. In making its determination of fair value, FS/EIG Advisor may use any independent third-party pricing or valuation services for which it has performed the appropriate level of due diligence. However, FS/EIG Advisor is not required to determine fair value in accordance with the valuation provided by any single source, and may use any relevant data, including information sourced by FS/EIG Advisor or provided by any independent third-party pricing or valuation service that FS/EIG Advisor deems to be reliable in determining fair value under the circumstances. Below is a description of factors that FS/EIG Advisor and any independent third-party valuation services may consider when determining the fair value of our investments.

The valuation methods utilized for each portfolio company may vary depending on industry and company-specific considerations. Typically, the first step is to make an assessment as to the enterprise value of the portfolio company’s business in order to establish whether the portfolio company’s enterprise value is greater than the amount of its debt as of the valuation date. This analysis helps to determine a risk profile for the applicable portfolio company and its related investments, and the appropriate

52

valuation methodology to utilize as part of the security valuation analysis. The enterprise valuation may be determined using a market or income approach.

Valuation of fixed income investments, such as loans and debt securities, depends upon a number of factors, including prevailing interest rates for like securities, expected volatility in future interest rates, call features, put features and other relevant terms of the debt. For investments without readily available market prices, FS/EIG Advisor may incorporate these factors into discounted cash flow models to arrive at fair value. Various methods may be used to determine the appropriate discount rate in a discounted cash flow model.

Other factors that may be considered include the borrower's ability to adequately service its debt, the fair market value of the borrower in relation to the face amount of its outstanding debt and the quality of collateral securing the debt investments.

For convertible debt securities, fair value generally approximates the fair value of the debt plus the fair value of an option to purchase the underlying security (i.e., the security into which the debt may convert) at the conversion price. To value such an option, a standard option pricing model may be used.

Our equity interests in portfolio companies for which there is no liquid public market are valued at fair value. Generally, the value of our equity interests in public companies for which market quotations are readily available is based upon the most recent closing public market price. Portfolio securities that carry certain restrictions on sale are typically valued at a discount from the public market value of the security.

When we receive warrants or other equity securities at nominal or no additional cost in connection with an investment in a debt security, the cost basis in the investment will be allocated between the debt securities and any such warrants or other equity securities received at the time of origination. FS/EIG Advisor subsequently values these warrants or other equity securities received at their fair value.

Swap contracts typically are valued at their daily prices obtained from an independent third party. The aggregate settlement values and notional amounts of the swap contracts are not recorded in the consolidated balance sheets. Fluctuations in the value of the swap contracts are recorded in the consolidated balance sheets as gross assets and gross liabilities and in the statements of operations as unrealized appreciation (depreciation) until closed, when they will be recorded as net realized gain (loss).

See Note 8 to our unaudited consolidated financial statements included herein for additional information regarding the fair value of our financial instruments.

Contractual Obligations

We have entered into an agreement with FS/EIG Advisor to provide us with investment advisory and administrative services. Payments for investment advisory services under the FS/EIG investment advisory agreement are equal to 1.75% of the average weekly value of our gross assets and an incentive fee based on our performance. Base management fees are generally paid on a quarterly basis in arrears. FS/EIG Advisor is reimbursed for administrative services expenses incurred on our behalf. See Note 4 to our unaudited consolidated financial statements included herein for a discussion of this agreement and for the amount of fees and expenses accrued under this agreement during the nine months ended September 30, 2023 and 2022.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk.

We are subject to financial market risks, including changes in interest rates. As of September 30, 2023, 44.1% of our portfolio investments (based on fair value) paid variable interest rates, 12.4% paid fixed interest rates, 23.5% were income producing preferred equity and equity/other investments and the remaining 20.0% consisted of non-income producing preferred equity and equity/other investments. A rise in the general level of interest rates can be expected to lead to higher interest rates applicable to any variable rate investments we hold and to declines in the value of any fixed rate investments we hold. However, many of our variable rate investments provide for an interest rate floor, which may prevent our interest income from increasing until benchmark interest rates increase beyond a threshold amount. To the extent that a substantial portion of our investments may be in variable rate investments, an increase in interest rates beyond this threshold would make it easier for us to meet or exceed the hurdle rate applicable to the subordinated incentive fee on income, and may result in a substantial increase in our net investment income and the amount of incentive fees payable to FS/EIG Advisor with respect to our increased pre-incentive fee net investment income.

Pursuant to the terms of the Barclays Facility, we borrow at a floating rate based on a benchmark interest rate. To the extent that any present or future credit facilities or other financing arrangements that we or any of our subsidiaries enter into are based on a floating interest rate, we will be subject to risks relating to changes in market interest rates. In periods of rising interest rates when we or our subsidiaries have such debt outstanding or financing arrangements in effect, our interest expense would increase, which could reduce our net investment income, especially to the extent we hold fixed rate investments.

The following table shows the effect over a twelve-month period of changes in interest rates on our interest income and net interest income, assuming no changes in the composition of our investment portfolio, including the accrual status of our investments, and our financing arrangements in effect as of September 30, 2023 (dollar amounts are presented in thousands):

Basis Point Change in Interest Rates	Increase (Decrease) in Interest Income(1)		Increase (Decrease) in Interest Expense(2)		Increase (Decrease) in Net Interest Income		Percentage Change in Net Interest Income
Down 100 basis points	$	(8,823)	$	(800)	$	(8,023)	(7.5)	%
No change	—		—		—		—
Up 100 basis points	$	5,176	$	800	$	4,376	4.1	%
Up 300 basis points	$	19,174	$	2,400	$	16,774	15.6	%
Up 500 basis points	$	33,173	$	4,000	$	29,173	27.2	%

___________________

(1)     Assumes no defaults or prepayments by portfolio companies over the next twelve months.

(2)     Assumes current debt outstanding as of September 30, 2023, and no changes over the next twelve months.

We expect that our long-term investments will be financed primarily with equity and debt. If deemed prudent, we may use interest rate risk management techniques in an effort to minimize our exposure to interest rate fluctuations. These techniques may include various interest rate hedging activities to the extent permitted by the 1940 Act. Adverse developments resulting from changes in interest rates or hedging transactions could have a material adverse effect on our business, financial condition and results of operations. During the nine months ended September 30, 2023 and 2022, we did not engage in interest rate hedging activities.

In addition, we may have risks regarding portfolio valuation and the potential inability of counterparties to meet the terms of their contracts. See “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates—Valuation of Portfolio Investments.”

Item 4. Controls and Procedures.

As required by Rule 13a-15(b) under the Exchange Act, we carried out an evaluation under the supervision and with the participation of our management, including our chief executive officer and chief financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of September 30, 2023. Based on the foregoing, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective to provide reasonable assurance that we would meet our disclosure obligations.

There was no change in our internal control over financial reporting (as defined in Rules 13a-15(f) or 15d-15(f) under the Exchange Act) that occurred during the three month period ended September 30, 2023 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

We are not currently subject to any material legal proceedings and, to our knowledge, no material legal proceedings are threatened against us. From time to time, we may be party to certain legal proceedings in the ordinary course of business, including proceedings relating to the enforcement of our rights under contracts with our portfolio companies. While the outcome of any legal proceedings cannot be predicted with certainty, we do not expect that any such proceedings will have a material effect upon our financial condition or results of operations.

Item 1A. Risk Factors.

In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the risk factors that appeared under Item 1A. “Risk Factors” in our most recent Annual Report on Form 10-K, as supplemented by our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2023 and June 30, 2023. There are no material changes from the risk factors included within our most recent Annual Report on Form 10-K, as supplemented by our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2023 and June 30, 2023.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Not applicable. See Note 3 to our unaudited consolidated financial statements contained in this quarterly report on Form 10-Q for a more detailed discussion of the terms of our share repurchase program and de minimis account liquidation.

Item 3. Defaults upon Senior Securities.

Not applicable.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

Rule 10b5-1 Trading Plans

During the fiscal quarter ended September 30, 2023, none of our trustees or executive officers adopted or terminated any contract, instruction or written plan for the purchase or sale of our securities to satisfy the affirmative defense conditions of Exchange Act Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement.”

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Item 6. Exhibits.

3.1    Third Amended and Restated Declaration of Trust of FS Energy and Power Fund. (Incorporated by reference to Exhibit 3.1 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on August 10, 2017.)

3.2    Amendment No. 1 to the Third Amended and Restated Declaration of Trust of FS Energy and Power Fund. (Incorporated by reference to Exhibit 3.2 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on August 10, 2017.)

3.3    Amendment No. 2 to the Third Amended and Restated Declaration of Trust of the Company. (Incorporated by reference to Exhibit 3.1 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on October 3, 2023.)

3.4    Second Amended and Restated Bylaws of FS Energy and Power Fund. (Incorporated by reference to Exhibit 3.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on June 1, 2017.)

3.5    Third Amended and Restated Bylaws of the Company. (Incorporated by reference to Exhibit 3.2 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on October 3, 2023.)

4.1    Second Amended and Restated Distribution Reinvestment Plan of FS Energy and Power Fund. (Incorporated by reference to Exhibit 4.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on October 17, 2016.)

4.2    Indenture, dated August 16, 2018, by and between FS Energy and Power Fund, U.S. Bank National Association, as trustee, and the guarantors named therein. (Incorporated by reference to Exhibit 4.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on August 22, 2018.)

10.1    Investment Advisory and Administrative Services Agreement, dated as of April 9, 2018, by and between FS Energy and Power Fund and FS/EIG Advisor, LLC. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on April 9, 2018.)

10.2    Custodian Agreement, dated as of November 14, 2011, by and between State Street Bank and Trust Company and FS Energy and Power Fund. (Incorporated by reference to Exhibit 10.6 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on November 14, 2011.)

10.3    Sale and Contribution Agreement, dated September 6, 2023, by and between FS Energy and Power Fund and FSSL Finance BB AssetCo LLC. (Incorporated by reference to Exhibit 10.1 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

10.4    Indenture, dated as of September 6, 2023, by and between FSSL Finance BB AssetCo LLC, Barclays Bank PLC, and Computershare Trust Company, N.A. (Incorporated by reference to Exhibit 10.2 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

10.5    FSSL Finance BB AssetCo LLC Notes Due 2033. (Incorporated by reference to Exhibit 10.3 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

10.6    Master Repurchase Agreement (September 1996 version), by and between Barclays Bank PLC and FSSL Finance BB Seller LLC, together with Annex 1 and the Master Confirmation thereto, each dated as of September 6, 2023. (Incorporated by reference to Exhibit 10.4 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

10.7    Guaranty, by FS Energy and Power Fund in favor of Barclays Bank PLC, dated as of September 6, 2023. (Incorporated by reference to Exhibit 10.5 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

10.8    Collateral Administration Agreement, by and between FSSL Finance BB AssetCo LLC, FS Energy and Power Fund and Computershare Trust Company, N.A., dated as of September 6, 2023. (Incorporated by reference to Exhibit 10.6 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

10.9    Investment Management Agreement, by and between FSSL Finance BB AssetCo LLC and FS Energy and Power Fund, dated as of September 6, 2023. (Incorporated by reference to Exhibit 10.7 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

10.10    Margining Agreement, by and between FSSL Finance BB AssetCo LLC, FS Energy and Power Fund, FSSL Finance BB Seller LLC and Barclays Bank PLC, dated as of September 6, 2023. (Incorporated by reference to Exhibit 10.8 to FS Specialty Lending Fund’s Current Report on Form 8-K filed on September 21, 2023.)

56

31.1*    Certification of Chief Executive Officer pursuant to Rule 13a-14 under the Securities Exchange Act of 1934, as amended.

31.2*    Certification of Chief Financial Officer pursuant to Rule 13a-14 under the Securities Exchange Act of 1934, as amended.

32.1*    Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS*    Inline XBRL Instance Document

101.SCH*    Inline XBRL Taxonomy Extension Schema Document

101.CAL*    Inline XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF*    Inline XBRL Taxonomy Extension Definition Linkbase Document

101.LAB*    Inline XBRL Taxonomy Extension Label Linkbase Document

101.PRE*    Inline XBRL Taxonomy Extension Presentation Linkbase Document

104    Cover Page Interactive Data File (embedded within the Inline XBRL document)

_______________

*    Filed herewith.

57

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized on November 13, 2023.

FS Specialty Lending Fund
By:	/s/ MICHAEL C. FORMAN
	Michael C. Forman Chief Executive Officer (Principal Executive Officer)
By:	/s/ EDWARD T. GALLIVAN, JR.
	Edward T. Gallivan, Jr. Chief Financial Officer (Principal Financial and Accounting Officer)

58

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Michael C. Forman, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of FS Specialty Lending Fund;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of trustees (or persons performing the equivalent functions):

a.    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 13, 2023

/s/ MICHAEL C. FORMAN

Michael C. Forman
Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Edward T. Gallivan, Jr. certify that:

1.    I have reviewed this quarterly report on Form 10-Q of FS Specialty Lending Fund;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of trustees (or persons performing the equivalent functions):

a.    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b.    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 13, 2023

/s/ EDWARD T. GALLIVAN, JR.

Edward T. Gallivan, Jr.
Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION of CEO and CFO PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of FS Specialty Lending Fund (the “Company”) for the three months ended September 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Form 10-Q”), Michael C. Forman, as Chief Executive Officer of the Company, and Edward T. Gallivan, Jr., as Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

•the Form 10-Q of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

•the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 13, 2023
	/s/ MICHAEL C. FORMAN
	Michael C. Forman Chief Executive Officer
	/s/ EDWARD T. GALLIVAN, JR.
	Edward T. Gallivan, Jr.   Chief Financial Officer

XML

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	814-00841
Entity Registrant Name	FS Specialty Lending Fund
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-6822130
Entity Address, Address Line One	201 Rouse Boulevard
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19112
City Area Code	215
Local Phone Number	495-1150
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		455,506,234
Entity Central Index Key	0001501729
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false

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Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2023		Dec. 31, 2022
Assets
Investments, at fair value		$ 1,492,766	[1],[2]	$ 2,047,115	[3],[4]
Cash		289,738		481,655
Restricted cash		2,000		0
Receivable for investments sold and repaid		776		7,022
Interest receivable		10,519		21,932
Dividends receivable		351		878
Unrealized appreciation on swap contracts		106		0
Swap income receivable		29		83
Prepaid expenses and other assets		49		96
Total assets		1,796,334		2,558,781
Liabilities
Payable for investments purchased		50,847		0
Secured note payable (net of deferred financing costs of $845 and $1,253, respectively)	[5]	0		454,671
Unrealized depreciation on swap contracts		404		698
Swap income payable		170		26
Shareholder distributions payable		0		13,543
Management fees payable		7,715		11,185
Administrative services expense payable		1,104		1,086
Interest payable		613		13,371
Trustees' fees payable		163		164
Other accrued expenses and liabilities		3,230		4,851
Total liabilities		138,873		805,033
Commitments and contingencies	[6]
Shareholders' equity
Preferred shares, $0.001 par value, 50,000,000 shares authorized, none issued and outstanding		0		0
Common shares, $0.001 par value, 700,000,000 shares authorized, 455,506,234 and 451,465,673 shares issued and outstanding, respectively		456		451
Capital in excess of par value		3,206,837		3,191,293
Accumulated earnings (deficit)		(1,549,832)		(1,437,996)
Total shareholders' equity		1,657,461		1,753,748
Total liabilities and shareholders' equity		$ 1,796,334		$ 2,558,781
Net asset value per common share at period end (in USD per share)		$ 3.64		$ 3.88
Repurchase Facility
Liabilities
Facilities payable	[5]	$ 74,627		$ 0
Credit Facilities
Liabilities
Facilities payable	[5]	0		305,438
Non-controlled/unaffiliated Investments
Assets
Investments, at fair value		1,351,411		1,786,887
Non-controlled/affiliated investments
Assets
Investments, at fair value		13,031		65,777
Controlled/affiliated investments
Assets
Investments, at fair value		$ 128,324		$ 194,451

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[5] See Note 9 for a discussion of the Company's financing arrangements.

[6] See Note 10 for a discussion of the Company's commitments and contingencies.

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023		Dec. 31, 2022
Amortized cost	$ 1,453,082	[1]	$ 1,922,940	[2]
Deferred financing costs on secured notes payable	$ 0		$ 1,253
Preferred stock, par value (in USD per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized	50,000,000		50,000,000
Preferred stock, shares issued	0		0
Preferred stock, shares outstanding	0		0
Common stock, par value (in USD per share)	$ 0.001		$ 0.001
Common stock, shares authorized	700,000,000		700,000,000
Common stock, shares issued	455,506,234		451,465,673
Common stock, shares outstanding	455,506,234		451,465,673
Repurchase Facility
Deferred financing cost on facilities payable	$ 5,373		$ 0
Credit Facilities
Deferred financing cost on facilities payable	0		238
Non-controlled/unaffiliated Investments
Amortized cost	1,256,706		1,656,169
Non-Controlled/Affiliated
Amortized cost	25,541		94,068
Controlled/affiliated
Amortized cost	$ 170,835		$ 172,703

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] Security may be an obligation of one or more entities affiliated with the named company.

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Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Investment income
Paid-in-kind interest income				$ 14,174		$ 18,268
Fee income				591		0
Total investment income		$ 30,443	$ 40,788	115,014		123,770
Operating expenses
Management fees		7,778	11,350	26,957		33,361
Administrative services expenses		1,887	1,695	4,566		4,605
Share transfer agent fees		820	768	2,365		2,216
Accounting and administrative fees		82	369	444		735
Interest expense	[1]	738	14,104	19,066		40,994
Trustees' fees		163	161	503		578
Other general and administrative expenses		1,486	842	3,524		2,502
Total operating expenses		12,954	29,289	57,425		84,991
Less: Management fee offset and waiver	[2]	(63)	(208)	(337)		(2,606)
Net expenses		12,891	29,081	57,088		82,385
Net investment income before taxes		17,552	11,707	57,926		41,385
Federal and state taxes		834	17	2,150		669
Net investment income		16,718	11,690	55,776		40,716
Realized and unrealized gain/loss
Net realized gain (loss) on investments:				(56,305)		36,770
Net realized gain (loss) on foreign currency		(3)	(202)	(123)		(202)
Net realized gain (loss) on swap contracts		(138)	(812)	88		(2,620)
Net realized gain (loss) on debt extinguishment		0	0	0		(929)
Net change in unrealized appreciation (depreciation) on investments:				(84,491)		80,592
Net change in unrealized appreciation (depreciation) on swap contracts		(803)	3,582	400		(6)
Net change in unrealized appreciation (depreciation) on foreign currency		(7)	(59)	27		(59)
Total net realized and unrealized gain (loss)		(44,141)	(62,791)	(140,404)		113,546
Net increase (decrease) in net assets resulting from operations		$ (27,423)	$ (51,101)	$ (84,628)		$ 154,262
Per share information—basic and diluted
Net increase (decrease) in net assets resulting from operations (Earnings per Share), basic (in USD per share)		$ (0.06)	$ (0.11)	$ (0.19)		$ 0.34
Net increase (decrease) in net assets resulting from operations (Earnings per Share), diluted (in USD per share)		$ (0.06)	$ (0.11)	$ (0.19)		$ 0.34
Weighted average shares outstanding, basic (in shares)		455,401,486	450,023,829	454,052,204		448,729,053
Weighted average shares outstanding, diluted (in shares)		455,401,486	450,023,829	454,052,204		448,729,053
Non-controlled/unaffiliated Investments
Investment income
Interest income		$ 26,497	$ 31,049	$ 78,286		$ 77,902
Paid-in-kind interest income		2,232	5,549	13,783		17,070
Fee income		586	1,061	1,712		4,252
Dividend income		334	479	14,757		479
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		6,553	2,930	(23,242)		(17,672)
Net change in unrealized appreciation (depreciation) on investments:		3,530	(57,812)	(36,013)		78,475
Non-Controlled/Affiliated
Investment income
Interest income		74	129	398		3,069
Paid-in-kind interest income		25	24	73	[3]	81
Fee income		0	0	0		7,268
Dividend income		0	0	0		5,417
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		(163)	718	(33,063)		41,922
Net change in unrealized appreciation (depreciation) on investments:		253	(13,142)	15,781		(11,013)
Controlled/affiliated
Investment income
Interest income		609	2,271	5,687		6,380
Paid-in-kind interest income		86	226	318	[4]	1,117
Dividend income		0	0	0		735
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		0	1,662	0		12,520
Net change in unrealized appreciation (depreciation) on investments:		$ (53,363)	$ 344	$ (64,259)		$ 13,130

[1] See Note 9 for a discussion of the Company's financing arrangements.

[2] See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.

[3] (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[4] (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

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Unaudited Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operations
Net investment income		$ 16,718	$ 11,690	$ 55,776	$ 40,716
Net realized gain (loss) on investments, foreign currency, swap contracts and debt extinguishment		6,249	4,296	(56,340)	33,019
Net change in unrealized appreciation (depreciation) on investments		(49,580)	(70,610)	(84,491)	80,592
Net change in unrealized appreciation (depreciation) on swap contracts		(803)	3,582	400	(6)
Net change in unrealized appreciation (depreciation) on foreign currency		(7)	(59)	27	(59)
Net increase (decrease) in net assets resulting from operations		(27,423)	(51,101)	(84,628)	154,262
Shareholder distributions
Distributions to shareholders	[1]	0	(13,504)	(27,208)	(40,395)
Net decrease in net assets resulting from shareholder distributions	[1]	0	(13,504)	(27,208)	(40,395)
Capital share transactions
Reinvestment of shareholder distributions	[2]	5,161	5,191	15,549	15,651
Net increase in net assets resulting from capital share transactions	[2]	5,161	5,191	15,549	15,651
Total increase (decrease) in net assets		(22,262)	(59,414)	(96,287)	129,518
Net assets at beginning of period		1,679,723		1,753,748	1,602,323
Net assets at end of period		$ 1,657,461	$ 1,731,841	$ 1,657,461	$ 1,731,841

[1] See Note 5 for a discussion of the sources of distributions paid by the Company.

[2] See Note 3 for a discussion of the Company's common share transactions.

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Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended				9 Months Ended				12 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022
Cash flows from operating activities
Net Income (Loss) Attributable to Parent		$ (27,423)		$ (51,101)		$ (84,628)		$ 154,262
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of investments						(253,471)		(373,525)
Paid-in-kind interest income						(14,174)		(18,268)
Proceeds from sales and repayments of investments						685,682		651,080
Net realized (gain) loss on investments						56,305		(36,770)
Net change in unrealized (appreciation) depreciation on investments						84,491		(80,592)
Net change in unrealized (appreciation) depreciation on swap contracts		803		(3,582)		(400)		6
Accretion of discount						(4,484)		(5,425)
Amortization of deferred financing costs and discount						2,903		5,155
(Increase) decrease in receivable for investments sold and repaid						6,246		4,958
(Increase) decrease in interest receivable						11,413		8,144
(Increase) decrease in dividends receivable						527		(864)
(Increase) decrease in swap income receivable						54		0
(Increase) decrease in prepaid expenses and other assets						47		18
Increase (decrease) in payable for investments purchased						50,847		(49,500)
Increase (decrease) in swap income payable						144		47
Increase (decrease) in management fees payable						(3,470)		676
Increase (decrease) in administrative services expense payable						18		656
Increase (decrease) in interest payable	[1]					(12,758)		(9,402)
Increase (decrease) in trustees' fees payable						(1)		(39)
Increase (decrease) in other accrued expenses and liabilities						(1,621)		(414)
Net cash provided by (used in) operating activities						523,670		250,203
Cash flows from financing activities
Shareholder distributions paid						(25,202)		(24,628)
Repayments of credit facilities	[1]					(305,676)		(10,000)
Repayments under senior secured notes	[1]					(457,075)		(31,925)
Deferred financing costs paid						(5,634)		(132)
Net cash provided by (used in) financing activities						(713,587)		(37,676)
Total increase (decrease) in cash						(189,917)		212,527
Cash at beginning of period						481,655		33,879		$ 33,879
Cash and restricted cash at end of period		$ 291,738	[2]	$ 246,406	[2]	291,738	[2]	246,406	[2]	$ 481,655
Supplemental disclosure
Non-cash reinvestment of shareholder distributions						15,549		15,651
Non-cash purchases of investments						(3,284)		(1,587)
Non-cash sales of investments						3,284		1,587
Income Taxes Paid						3,596		1,024
Credit Facilities
Cash flows from financing activities
Borrowings under debt facilities	[1]					0		29,009
Repurchase Facility
Cash flows from financing activities
Borrowings under debt facilities	[1]					$ 80,000		$ 0

[1] See Note 9 for a discussion of the Company's financing arrangements. During the nine months ended September 30, 2023 and 2022, the Company paid $28,921 and $45,241, respectively, in interest expense on the financing arrangements and Senior Secured Notes.

[2] Includes cash of $289,738 and restricted cash of $2,000. Restricted cash is the cash collateral required to be posted pursuant to the Company’s equity total return swap.

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Unaudited Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Statement of Cash Flows [Abstract]
Interest expense paid	$ 28,921	$ 45,241
Cash	289,738
Restricted cash	$ 2,000

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Unaudited Consolidated Schedule of Investments $ in Thousands		9 Months Ended		12 Months Ended
		Sep. 30, 2023 USD ($) MMBTU $ / shares $ / MMBTU $ / bbl shares bbl		Dec. 31, 2022 USD ($) MMBTU $ / shares $ / MMBTU $ / MBbls shares bbl		Dec. 31, 2021 USD ($)
Percent of net assets		90.10%	[1]	116.70%	[2]
Liabilities in excess of other assets percentage		9.90%	[1]	(16.70%)	[2]
Amortized Cost		$ 1,453,082	[1]	$ 1,922,940	[2]
Investments, at fair value		1,492,766	[1],[3]	2,047,115	[2],[4]
Assets (liabilities) in excess of other liabilities (assets)		164,695	[1],[3],[5]	(293,367)	[2],[4],[6]
Net Assets		1,657,461	[1],[3]	1,753,748	[2],[4]
Unrealized depreciation		(404)		(698)
Total Commodity Fixed Price Swaps
Unrealized depreciation	[7]			(698)
Unrealized appreciation	[7]			$ 0
Unrealized depreciation	[8],[9]	$ (368)
Total Commodity Fixed Price Swaps—Crude Oil
Notional amount, volume | bbl		39,290	[9]	168,511	[7]
Weighted average price		80.00	[9]	80.00	[7]
Unrealized depreciation		$ (404)	[8],[9]	$ (572)	[7],[10]
Unrealized appreciation	[7],[10]			0
Unrealized depreciation		$ (404)		$ (572)
Total Commodity Fixed Price Swaps—Natural Gas
Notional amount, energy | MMBTU		52,626	[9]	314,818	[7]
Weighted average price | $ / MMBTU		3.80	[9]	3.80	[7]
Unrealized depreciation	[7],[10]			$ (126)
Unrealized appreciation		$ 36	[8],[9]	0	[7],[10]
Unrealized depreciation		0		(126)
Total Equity Total Return Swaps
Notional		$ 2,897
Number of shares | shares		547,479
Unrealized appreciation	[8]	$ 70
Unrealized depreciation		$ 0		$ 0
Interest rate	[11]	1.15%
Net Senior Secured Loans—First Lien
Percent of net assets		38.10%	[1]	40.30%	[2]
Amortized Cost		$ 675,016	[1]	$ 702,842	[2]
Investments, at fair value		631,307	[1],[3]	706,646	[2],[4]
Total Senior Secured Loans—First Lien
Amortized Cost		681,757	[1]	727,228	[2]
Investments, at fair value		638,048	[1],[3]	731,032	[2],[4]
Unfunded Loan Commitments
Amortized Cost		(6,741)	[1]	(24,386)	[2]
Investments, at fair value		$ (6,741)	[1],[3]	$ (24,386)	[2],[4]
Net Senior Secured Loans—Second Lien
Percent of net assets		4.20%	[1]	8.20%	[2]
Amortized Cost		$ 70,267	[1]	$ 143,153	[2]
Investments, at fair value		$ 69,599	[1],[3]	143,270	[2],[4]
Unfunded Loan Commitments
Amortized Cost	[2]			(1,505)
Investments, at fair value	[2],[4]			(1,505)
Total Senior Secured Loans—Second Lien
Amortized Cost	[2]			144,658
Investments, at fair value	[2],[4]			$ 144,775
Senior Secured Bonds
Percent of net assets		2.00%	[1]	0.60%	[2]
Amortized Cost		$ 33,385	[1]	$ 10,064	[2]
Investments, at fair value		$ 32,681	[1],[3]	$ 10,074	[2],[4]
Unsecured Debt
Percent of net assets		6.60%	[1]	13.70%	[2]
Amortized Cost		$ 108,367	[1]	$ 253,675	[2]
Investments, at fair value		$ 109,302	[1],[3]	$ 241,418	[2],[4]
Preferred Equity
Percent of net assets		15.60%	[1]	22.80%	[2]
Amortized Cost		$ 252,450	[1]	$ 425,182	[2]
Investments, at fair value		$ 259,205	[1],[3]	$ 400,414	[2],[4]
Sustainable Infrastructure Investments, LLC
Percent of net assets		3.00%	[1]	2.90%	[2]
Amortized Cost		$ 54,514	[1]	$ 54,514	[2]
Investments, at fair value		$ 49,192	[1],[3]	$ 51,098	[2],[4]
Equity/Other
Percent of net assets		20.60%	[1]	28.20%	[2]
Amortized Cost		$ 259,083	[1]	$ 333,510	[2]
Investments, at fair value		$ 341,480	[1],[3]	$ 494,195	[2],[4]
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Variable Rate	[1],[11],[12],[13],[14]	4.00%
PIK Rate	[1],[11],[12],[13],[14]	3.00%
Max PIK Rate	[1],[11],[12],[13],[14]	3.00%
Floor Rate	[1],[11],[12],[13],[14]	1.50%
Principal amount	[1],[12],[13],[14],[15]	$ 22,970
Amortized Cost	[1],[12],[13],[14]	20,881
Investments, at fair value	[1],[3],[12],[13],[14]	$ 22,878
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Variable Rate	[2],[16],[17],[18]			4.00%
PIK Rate	[2],[16],[17],[18]			3.00%
Max PIK Rate	[2],[16],[17],[18]			3.00%
Floor Rate	[2],[16],[17],[18],[19]			1.50%
Principal amount	[2],[16],[17],[18],[20]			$ 22,734
Amortized Cost	[2],[16],[17],[18]			20,082
Investments, at fair value	[2],[4],[16],[17],[18]			$ 23,519
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Variable Rate	[2],[16],[17],[18],[21]			4.00%
PIK Rate	[2],[16],[17],[18],[21]			3.00%
Max PIK Rate	[2],[16],[17],[18],[21]			3.00%
Floor Rate	[2],[16],[17],[18],[19],[21]			1.50%
Principal amount	[2],[16],[17],[18],[20],[21]			$ 5,359
Amortized Cost	[2],[16],[17],[18],[21]			5,359
Investments, at fair value	[2],[4],[16],[17],[18],[21]			$ 5,545
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Energy—Power
Strike price (in dollars per share) | $ / shares	[1],[12],[13],[14],[22]	$ 1.00
Number of Shares | shares	[1],[12],[13],[14],[22]	35
Amortized Cost	[1],[12],[13],[14],[22]	$ 2,652
Investments, at fair value	[1],[3],[12],[13],[14],[22]	$ 187
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Power
Strike price (in dollars per share) | $ / shares	[2],[16],[18],[23],[24],[25]			$ 1.00
Number of Shares | shares	[2],[16],[17],[18],[24],[25]			35
Amortized Cost	[2],[16],[17],[18],[24],[25]			$ 2,652
Investments, at fair value	[2],[4],[16],[17],[18],[24],[25]			$ 1,630
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Energy—Service & Equipment
Number of Shares | shares	[1],[12],[22]	6,944,444
Amortized Cost	[1],[12],[22]	$ 6,944
Investments, at fair value	[1],[3],[12],[22]	$ 1,521
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Service & Equipment
Number of Shares | shares	[2],[16],[24],[25]			6,944,444
Amortized Cost	[2],[16],[24],[25]			$ 6,944
Investments, at fair value	[2],[4],[16],[24],[25]			$ 1,219
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Energy—Service & Equipment
Number of Shares | shares	[1],[12],[22]	28,942,003
Amortized Cost	[1],[12],[22]	$ 1,447
Investments, at fair value	[1],[3],[12],[22]	$ 11,027
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Service & Equipment
Number of Shares | shares	[2],[16],[24],[25]			28,942,003
Amortized Cost	[2],[16],[24],[25]			$ 1,447
Investments, at fair value	[2],[4],[16],[24],[25]			$ 8,321
Investment, Identifier [Axis]: Acrisure LLC, Insurance
Variable Rate	[1],[11],[26],[27]	5.75%
Floor Rate	[1],[11],[26],[27]	1.00%
Principal amount	[1],[15],[26],[27]	$ 11,191
Amortized Cost	[1],[26],[27]	11,271
Investments, at fair value	[1],[3],[26],[27]	$ 11,275
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Variable Rate	[2],[16],[25]			7.50%
Floor Rate	[2],[16],[19],[25]			1.50%
Principal amount	[2],[16],[20],[25]			$ 20,000
Amortized Cost	[2],[16],[25]			19,848
Investments, at fair value	[2],[4],[16],[25]			$ 20,138
Investment, Identifier [Axis]: Aethon United BR LP, Energy—Upstream
Rate	[1],[11]	8.30%
Principal amount	[1],[15]	$ 40,500
Amortized Cost	[1]	40,500
Investments, at fair value	[1],[3]	$ 40,219
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Rate	[2],[25]			8.30%
Principal amount	[2],[20],[25]			$ 40,500
Amortized Cost	[2],[25]			40,500
Investments, at fair value	[2],[4],[25]			40,221
Investment, Identifier [Axis]: AirSwift Holdings, Ltd., Common Equity, Commercial & Professional Services
Number of Shares | shares	[1],[12],[14],[22]	3,750,000
Amortized Cost	[1],[12],[14],[22]	$ 6,029
Investments, at fair value	[1],[3],[12],[14],[22]	3,075
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC
Investments, at fair value		$ 0		$ 8,436	[28]	$ 7,782	[28]
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
PIK Rate	[2],[16],[23],[25]			8.00%
Max PIK Rate	[2],[16],[23],[25]			8.00%
Principal amount	[2],[16],[20],[23],[25]			$ 8,436
Amortized Cost	[2],[16],[23],[25]			8,436
Investments, at fair value	[2],[4],[16],[23],[25]			$ 8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
PIK Rate	[2],[16],[21],[23]			8.00%
Max PIK Rate	[2],[16],[21],[23]			8.00%
Principal amount	[2],[16],[20],[21],[23]			$ 2,500
Amortized Cost	[2],[16],[21],[23]			2,500
Investments, at fair value	[2],[4],[16],[21],[23]			2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Variable Rate	[1],[11],[26],[27]	4.75%
Floor Rate	[1],[11],[26],[27]	0.50%
Principal amount	[1],[15],[26],[27]	$ 5,500
Amortized Cost	[1],[26],[27]	5,429
Investments, at fair value	[1],[3],[26],[27]	$ 5,431
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Variable Rate	[1],[11],[26]	3.75%
Floor Rate	[1],[11],[26]	0.50%
Principal amount	[1],[15],[26]	$ 9,954
Amortized Cost	[1],[26]	9,638
Investments, at fair value	[1],[3],[26]	9,631
Investment, Identifier [Axis]: Allied Wireline Services, LLC
Investments, at fair value		37,176		63,888		46,339
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity
Investments, at fair value		$ 0		$ 10,463		0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Energy—Service & Equipment
Number of Shares | shares	[1],[12],[22],[29],[30]	48,400
Amortized Cost	[1],[12],[22],[29],[30]	$ 1,527
Investments, at fair value	[1],[3],[12],[22],[29],[30]	$ 0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Service & Equipment
Number of Shares | shares	[2],[16],[23],[24],[25],[31]			48,400
Amortized Cost	[2],[16],[23],[24],[25],[31]			$ 1,527
Investments, at fair value	[2],[4],[16],[23],[24],[25],[31]			$ 10,463
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
PIK Rate	[1],[11],[12],[22],[26],[30],[32]	10.00%
Max PIK Rate	[1],[11],[12],[22],[26],[30],[32]	10.00%
Principal amount	[1],[12],[15],[22],[26],[30],[32]	$ 70,277
Amortized Cost	[1],[12],[22],[26],[30],[32]	70,277
Investments, at fair value	[1],[3],[12],[22],[26],[30],[32]	37,176
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
PIK Rate	[2],[16],[23],[25]			10.00%
Max PIK Rate	[2],[16],[23],[25]			10.00%
Principal amount	[2],[16],[20],[23],[25]			$ 63,888
Amortized Cost	[2],[16],[23],[25]			63,888
Investments, at fair value	[2],[4],[16],[23],[25]			63,888
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants
Investments, at fair value		$ 0		$ 0		0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Energy—Service & Equipment
Number of Shares | shares	[1],[12],[22],[29],[30]	22,000
Amortized Cost	[1],[12],[22],[29],[30]	$ 0
Investments, at fair value	[1],[3],[12],[22],[29],[30]	$ 0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Service & Equipment
Number of Shares | shares	[2],[16],[23],[24],[25],[31]			22,000
Amortized Cost	[2],[16],[23],[24],[25],[31]			$ 0
Investments, at fair value	[2],[4],[16],[23],[24],[25],[31]			$ 0
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Rate	[2],[18],[25]			6.30%
Principal amount	[2],[18],[20],[25]			$ 3,098
Amortized Cost	[2],[18],[25]			3,168
Investments, at fair value	[2],[4],[18],[25]			$ 2,840
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Energy—Upstream
Number of Shares | shares	[1],[12]	126,632,117
Amortized Cost	[1],[12]	$ 351
Investments, at fair value	[1],[3],[12]	$ 472
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Upstream
Number of Shares | shares	[2],[16],[24],[25]			126,632,117
Amortized Cost	[2],[16],[24],[25]			$ 351
Investments, at fair value	[2],[4],[16],[24],[25]			$ 858
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Energy—Upstream
Number of Shares | shares	[1],[12],[22],[29]	1,486,929
Amortized Cost	[1],[12],[22],[29]	$ 44,700
Investments, at fair value	[1],[3],[12],[22],[29]	$ 41,357
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Upstream
Number of Shares | shares	[2],[16],[24],[25],[31]			148,692,948
Amortized Cost	[2],[16],[24],[25],[31]			$ 44,700
Investments, at fair value	[2],[4],[16],[24],[25],[31]			$ 52,340
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Variable Rate	[1],[11],[26]	3.75%
Floor Rate	[1],[11],[26]	0.50%
Principal amount	[1],[15],[26]	$ 9,949
Amortized Cost	[1],[26]	8,565
Investments, at fair value	[1],[3],[26]	$ 8,986
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Variable Rate	[1],[11],[26],[27]	4.75%
Floor Rate	[1],[11],[26],[27]	0.50%
Principal amount	[1],[15],[26],[27]	$ 14,975
Amortized Cost	[1],[26],[27]	15,035
Investments, at fair value	[1],[3],[26],[27]	$ 14,992
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Variable Rate	[2]			4.00%
Principal amount	[2],[20]			$ 39,259
Amortized Cost	[2]			38,085
Investments, at fair value	[2],[4]			$ 39,137
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Variable Rate	[1],[11]	5.50%
Principal amount	[1],[15]	$ 997
Amortized Cost	[1]	783
Investments, at fair value	[1],[3]	$ 808
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Variable Rate	[2]			4.00%
Floor Rate	[2],[19]			1.00%
Principal amount	[2],[20]			$ 14,286
Amortized Cost	[2]			14,146
Investments, at fair value	[2],[4]			$ 14,155
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Energy—Power
Variable Rate	[1],[11],[26]	3.75%
Principal amount	[1],[15],[26]	$ 23,172
Amortized Cost	[1],[26]	22,519
Investments, at fair value	[1],[3],[26]	$ 21,136
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Variable Rate	[2]			3.75%
Principal amount	[2],[20]			$ 23,601
Amortized Cost	[2]			22,760
Investments, at fair value	[2],[4]			$ 21,935
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Common Equity, Service & Equipment
Number of Shares | shares	[2],[16],[24],[25]			4,302,293
Amortized Cost	[2],[16],[24],[25]			$ 3,950
Investments, at fair value	[2],[4],[16],[24],[25]			$ 0
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Participation Option, Service & Equipment
Number of Shares | shares	[2],[16],[24],[25]			25,000,000
Amortized Cost	[2],[16],[24],[25]			$ 1,289
Investments, at fair value	[2],[4],[16],[24],[25]			$ 0
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Variable Rate	[2],[16],[24],[25],[33]			9.00%
Floor Rate	[2],[16],[19],[24],[25],[33]			1.00%
Principal amount	[2],[16],[20],[24],[25],[33]			$ 7,500
Amortized Cost	[2],[16],[24],[25],[33]			6,563
Investments, at fair value	[2],[4],[16],[24],[25],[33]			$ 3,713
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 1
Variable Rate	[1],[11],[12],[26]	6.75%
Floor Rate	[1],[11],[12],[26]	1.00%
Principal amount	[1],[12],[15],[26]	$ 20,968
Amortized Cost	[1],[12],[26]	20,968
Investments, at fair value	[1],[3],[12],[26]	$ 20,968
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 2
Variable Rate	[1],[11],[12],[34]	6.75%
Floor Rate	[1],[11],[12],[34]	1.00%
Principal amount	[1],[12],[15],[34]	$ 2,688
Amortized Cost	[1],[12],[34]	2,688
Investments, at fair value	[1],[3],[12],[34]	$ 2,688
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 3
Variable Rate	[1],[11],[12],[34]	6.75%
Floor Rate	[1],[11],[12],[34]	1.00%
Principal amount	[1],[12],[15],[34]	$ 1,344
Amortized Cost	[1],[12],[34]	1,344
Investments, at fair value	[1],[3],[12],[34]	$ 1,344
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Variable Rate	[1],[11],[12],[26]	7.65%
Floor Rate	[1],[11],[12],[26]	1.00%
Principal amount	[1],[12],[15],[26]	$ 36,000
Amortized Cost	[1],[12],[26]	35,513
Investments, at fair value	[1],[3],[12],[26]	$ 35,377
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Variable Rate	[2],[16],[25]			7.65%
Floor Rate	[2],[16],[19],[25]			1.00%
Principal amount	[2],[16],[20],[25]			$ 39,000
Amortized Cost	[2],[16],[25]			38,440
Investments, at fair value	[2],[4],[16],[25]			$ 38,240
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Variable Rate	[2]			4.25%
Floor Rate	[2],[19]			1.00%
Principal amount	[2],[20]			$ 31,575
Amortized Cost	[2]			30,712
Investments, at fair value	[2],[4]			$ 31,384
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Variable Rate	[1],[9],[11],[12],[35]	8.50%
Principal amount	[1],[9],[12],[15],[35]	$ 100,000
Amortized Cost	[1],[9],[12],[35]	3,907
Investments, at fair value	[1],[3],[9],[12],[35]	$ 4,275
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Rate	[2],[7],[16],[36]			12.90%
Principal amount	[2],[7],[16],[20],[36]			$ 100,000
Amortized Cost	[2],[7],[16],[36]			11,081
Investments, at fair value	[2],[4],[7],[16],[36]			$ 20,683
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Variable Rate	[2]			5.25%
Principal amount	[2],[20]			$ 26,882
Amortized Cost	[2]			26,609
Investments, at fair value	[2],[4]			$ 26,075
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Variable Rate	[2],[16],[25]			6.25%
Floor Rate	[2],[16],[19],[25]			0.80%
Principal amount	[2],[16],[20],[25]			$ 37,000
Amortized Cost	[2],[16],[25]			36,601
Investments, at fair value	[2],[4],[16],[25]			$ 36,656
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Rate	[2],[18]			8.00%
Principal amount	[2],[18],[20]			$ 11,400
Amortized Cost	[2],[18]			11,400
Investments, at fair value	[2],[4],[18]			$ 10,920
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Rate	[2],[25]			5.80%
Principal amount	[2],[20],[25]			$ 24,299
Amortized Cost	[2],[25]			25,388
Investments, at fair value	[2],[4],[25]			$ 23,306
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Variable Rate	[1],[11],[26],[27]	3.50%
Floor Rate	[1],[11],[26],[27]	0.80%
Principal amount	[1],[15],[26],[27]	$ 9,975
Amortized Cost	[1],[26],[27]	9,950
Investments, at fair value	[1],[3],[26],[27]	$ 9,936
Investment, Identifier [Axis]: FR BR Holdings LLC, Energy—Midstream
Variable Rate	[1],[11],[12]	6.50%
Principal amount	[1],[12],[15]	$ 80,582
Amortized Cost	[1],[12]	80,261
Investments, at fair value	[1],[3],[12]	$ 80,405
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Variable Rate	[2],[16],[25]			6.50%
Principal amount	[2],[16],[20],[25]			$ 81,582
Amortized Cost	[2],[16],[25]			80,371
Investments, at fair value	[2],[4],[16],[25]			$ 81,361
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Variable Rate	[1],[11],[12],[26]	7.50%
Floor Rate	[1],[11],[12],[26]	0.50%
Principal amount	[1],[12],[15],[26]	$ 17,122
Amortized Cost	[1],[12],[26]	16,916
Investments, at fair value	[1],[3],[12],[26]	$ 17,267
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Variable Rate	[2],[16]			7.50%
Floor Rate	[2],[16],[19]			0.50%
Principal amount	[2],[16],[20]			$ 17,347
Amortized Cost	[2],[16]			17,103
Investments, at fair value	[2],[4],[16]			$ 17,406
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Variable Rate	[1],[11],[26],[27]	50000.00%
Floor Rate	[1],[11],[26],[27]	1.00%
Principal amount	[1],[15],[26],[27]	$ 9,957
Amortized Cost	[1],[26],[27]	9,760
Investments, at fair value	[1],[3],[26],[27]	$ 9,849
Investment, Identifier [Axis]: GIP II Blue Holding LP, Energy—Midstream
Variable Rate	[1],[11],[26]	4.50%
Floor Rate	[1],[11],[26]	1.00%
Principal amount	[1],[15],[26]	$ 3,137
Amortized Cost	[1],[26]	3,100
Investments, at fair value	[1],[3],[26]	3,151
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Variable Rate	[2]			4.50%
Floor Rate	[2],[19]			1.00%
Principal amount	[2],[20]			$ 5,918
Amortized Cost	[2]			5,842
Investments, at fair value	[2],[4]			5,877
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity
Investments, at fair value		$ 1,413		$ 5,044		0
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Energy—Midstream
Number of Shares | shares	[1],[12],[22],[29],[37]	105,785
Amortized Cost	[1],[12],[22],[29],[37]	$ 6,681
Investments, at fair value	[1],[3],[12],[22],[29],[37]	$ 1,413
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Midstream
Number of Shares | shares	[2],[16],[24],[25],[31],[38]			105,785
Amortized Cost	[2],[16],[24],[25],[31],[38]			$ 6,681
Investments, at fair value	[2],[4],[16],[24],[25],[31],[38]			$ 5,044
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Variable Rate		7.80%
Principal amount	[1],[12],[14],[15]	$ 13,951
Amortized Cost	[1],[12],[14]	13,871
Investments, at fair value	[1],[3],[12],[14]	$ 13,263
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Variable Rate	[2],[16],[18]			7.75%
Principal amount	[2],[16],[18],[20]			$ 14,648
Amortized Cost	[2],[16],[18]			14,556
Investments, at fair value	[2],[4],[16],[18]			$ 14,010
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Variable Rate	[2]			5.00%
Floor Rate	[2],[19]			0.80%
Principal amount	[2],[20]			$ 7,432
Amortized Cost	[2]			7,305
Investments, at fair value	[2],[4]			$ 7,385
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Variable Rate	[2]			5.00%
Floor Rate	[2],[19]			0.80%
Principal amount	[2],[20]			$ 163
Amortized Cost	[2]			160
Investments, at fair value	[2],[4]			$ 162
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 1
Number of Shares | shares	[1],[12],[22]	2,785,562
Amortized Cost	[1],[12],[22]	$ 2,786
Investments, at fair value	[1],[3],[12],[22]	$ 0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2
PIK Rate	[1],[11],[12],[22],[32]	9.00%
Max PIK Rate	[1],[11],[12],[22],[32]	9.00%
Number of Shares | shares	[1],[12],[22],[32]	19,526
Amortized Cost	[1],[12],[22],[32]	$ 12,493
Investments, at fair value	[1],[3],[12],[22],[32]	$ 9,494
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Industrials 1
Number of Shares | shares	[2],[16],[24],[25]			2,785,562
Amortized Cost	[2],[16],[24],[25]			$ 2,786
Investments, at fair value	[2],[4],[16],[24],[25]			$ 0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Industrials 2
PIK Rate	[2],[16],[24],[25],[33]			9.00%
Max PIK Rate	[2],[16],[24],[25],[33]			9.00%
Number of Shares | shares	[2],[16],[24],[25],[33]			18,296
Amortized Cost	[2],[16],[24],[25],[33]			$ 12,493
Investments, at fair value	[2],[4],[16],[24],[25],[33]			$ 9,377
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Variable Rate	[1],[11],[12],[26]	7.00%
Floor Rate	[1],[11],[12],[26]	0.50%
Principal amount	[1],[12],[15],[26]	$ 14,703
Amortized Cost	[1],[12],[26]	14,511
Investments, at fair value	[1],[3],[12],[26]	$ 14,587
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Variable Rate	[2],[16]			7.25%
Floor Rate	[2],[16],[19]			0.50%
Principal amount	[2],[16],[20]			$ 14,963
Amortized Cost	[2],[16]			14,752
Investments, at fair value	[2],[4],[16]			14,819
Investment, Identifier [Axis]: Great Western Petroleum, LLC
Investments, at fair value				0		58,055
Investment, Identifier [Axis]: Great Western Petroleum, LLC, Common Equity
Investments, at fair value				$ 0		40,731
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Variable Rate	[1],[11],[26]	4.00%
Floor Rate	[1],[11],[26]	0.50%
Principal amount	[1],[15],[26]	$ 9,975
Amortized Cost	[1],[26]	9,975
Investments, at fair value	[1],[3],[26]	$ 9,999
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Rate	[1],[11],[26],[27]	8.50%
Principal amount	[1],[15],[26],[27]	$ 15,000
Amortized Cost	[1],[26],[27]	13,577
Investments, at fair value	[1],[3],[26],[27]	$ 13,050
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
PIK Rate	[2],[16]			16.50%
Max PIK Rate	[2],[16]			16.50%
Principal amount	[2],[16],[20]			$ 30,391
Amortized Cost	[2],[16]			31,075
Investments, at fair value	[2],[4],[16]			$ 31,007
Investment, Identifier [Axis]: Hammerhead Resources Inc., Energy—Upstream
PIK Rate	[1],[11],[12],[14]	12.00%
Max PIK Rate	[1],[11],[12],[14]	12.00%
Principal amount	[1],[12],[14],[15]	$ 39,458
Amortized Cost	[1],[12],[14]	39,366
Investments, at fair value	[1],[3],[12],[14]	39,459
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Variable Rate	[2],[16],[18],[25]			12.00%
Max PIK Rate	[2],[16],[18],[25]			12.00%
Principal amount	[2],[16],[18],[20],[25]			$ 35,118
Amortized Cost	[2],[16],[18],[25]			34,961
Investments, at fair value	[2],[4],[16],[18],[25]			35,118
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity
Investments, at fair value		$ 675		$ 810		2,836
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Energy—Upstream
Number of Shares | shares	[1],[12],[22],[37]	135,062
Amortized Cost	[1],[12],[22],[37]	$ 14,418
Investments, at fair value	[1],[3],[12],[22],[37]	$ 675
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Upstream
Number of Shares | shares	[2],[24],[25],[38]			135,062
Amortized Cost	[2],[24],[25],[38]			$ 15,059
Investments, at fair value	[2],[4],[24],[25],[38]			810
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Variable Rate	[1],[11],[26]	5.00%
Principal amount	[1],[15],[26]	$ 21,000
Amortized Cost	[1],[26]	20,370
Investments, at fair value	[1],[3],[26]	20,297
Investment, Identifier [Axis]: Limetree Bay Energy, LLC
Investments, at fair value				0		3,166
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units
Investments, at fair value		$ 0		$ 1,885		6,046
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units, Midstream
Number of Shares | shares	[2],[16],[24],[25],[38]			76,938,973
Amortized Cost	[2],[16],[24],[25],[38]			$ 21,458
Investments, at fair value	[2],[4],[16],[24],[25],[38]			$ 1,885
Investment, Identifier [Axis]: MB Precision Investment Holdings LLC, Class A-2 Units, Industrials
Number of Shares | shares	[2],[16],[24],[25],[31]			1,426,110
Amortized Cost	[2],[16],[24],[25],[31]			$ 490
Investments, at fair value	[2],[4],[16],[24],[25],[31]			0
Investment, Identifier [Axis]: MECO IV Holdco, LLC
Investments, at fair value				0		22,745
Investment, Identifier [Axis]: MECO IV Holdco, LLC, Class A-1 Units
Investments, at fair value				$ 0		4,181
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Energy—Upstream
Number of Shares | shares	[1],[12],[29]	503,176
Amortized Cost	[1],[12],[29]	$ 138,208
Investments, at fair value	[1],[3],[12],[29]	$ 250,421
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Upstream
Number of Shares | shares	[2],[16],[25],[31]			503,176
Amortized Cost	[2],[16],[25],[31]			$ 138,208
Investments, at fair value	[2],[4],[16],[25],[31]			$ 312,372
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, LP, Consumer Discretionary Distribution & Retail
Variable Rate	[1],[11],[26],[27]	4.00%
Floor Rate	[1],[11],[26],[27]	0.80%
Principal amount	[1],[15],[26],[27]	$ 14,944
Amortized Cost	[1],[26],[27]	14,849
Investments, at fair value	[1],[3],[26],[27]	$ 14,925
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Variable Rate	[2]			3.75%
Floor Rate	[2],[19]			0.80%
Principal amount	[2],[20]			$ 7,920
Amortized Cost	[2]			7,886
Investments, at fair value	[2],[4]			$ 7,862
Investment, Identifier [Axis]: Meritage Midstream Services II, LLC, Energy—Midstream
Variable Rate	[1],[11],[12]	6.75%
Floor Rate	[1],[11],[12]	1.00%
Principal amount	[1],[12],[15]	$ 21,759
Amortized Cost	[1],[12]	21,361
Investments, at fair value	[1],[3],[12]	$ 22,409
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Energy—Upstream
Rate	[1],[11]	7.50%
Principal amount	[1],[15]	$ 11,693
Amortized Cost	[1]	10,635
Investments, at fair value	[1],[3]	$ 11,340
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Rate	[2],[25]			7.50%
Principal amount	[2],[20],[25]			$ 11,693
Amortized Cost	[2],[25]			10,358
Investments, at fair value	[2],[4],[25]			$ 10,561
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Rate	[1],[11],[12],[14],[22],[26],[32]	14.20%
Number of Shares | shares	[1],[12],[14],[22],[26],[32]	156,250
Amortized Cost	[1],[12],[14],[22],[26],[32]	$ 157,633
Investments, at fair value	[1],[3],[12],[14],[22],[26],[32]	$ 139,911
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Rate	[2],[16],[18],[24],[25],[33]			14.20%
Number of Shares | shares	[2],[16],[18],[24],[25],[33]			156,250
Amortized Cost	[2],[16],[18],[24],[25],[33]			$ 157,633
Investments, at fair value	[2],[4],[16],[18],[24],[25],[33]			$ 125,000
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Midstream
Strike price (in dollars per share) | $ / shares	[2],[16],[18],[24],[25]			$ 13.56
Number of Shares | shares	[2],[16],[18],[24],[25]			546,880
Amortized Cost	[2],[16],[18],[24],[25]			$ 630
Investments, at fair value	[2],[4],[16],[18],[24],[25]			$ 3
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Energy—Midstream
Strike price (in dollars per share) | $ / shares	[1],[12],[14],[22]	$ 14.54
Number of Shares | shares	[1],[12],[14],[22]	2,187,500
Amortized Cost	[1],[12],[14],[22]	$ 3,083
Investments, at fair value	[1],[3],[12],[14],[22]	$ 695
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Midstream
Strike price (in dollars per share) | $ / shares	[2],[16],[18],[24],[25]			$ 14.54
Number of Shares | shares	[2],[16],[18],[24],[25]			2,187,500
Amortized Cost	[2],[16],[18],[24],[25]			$ 3,083
Investments, at fair value	[2],[4],[16],[18],[24],[25]			$ 10
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike:$13.56, Energy—Midstream
Strike price (in dollars per share) | $ / shares	[1],[12],[14],[22]	$ 13.56
Number of Shares | shares	[1],[12],[14],[22]	546,880
Amortized Cost	[1],[12],[14],[22]	$ 630
Investments, at fair value	[1],[3],[12],[14],[22]	$ 168
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Energy—Midstream
Strike price (in dollars per share) | $ / shares	[1],[12],[14],[22]	$ 16.27
Number of Shares | shares	[1],[12],[14],[22]	781,250
Amortized Cost	[1],[12],[14],[22]	$ 576
Investments, at fair value	[1],[3],[12],[14],[22]	$ 173
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Midstream
Strike price (in dollars per share) | $ / shares	[2],[16],[18],[24],[25]			$ 16.27
Number of Shares | shares	[2],[16],[18],[24],[25]			781,250
Amortized Cost	[2],[16],[18],[24],[25]			$ 576
Investments, at fair value	[2],[4],[16],[18],[24],[25]			$ 2
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Energy—Midstream
Strike price (in dollars per share) | $ / shares	[1],[12],[14],[22]	$ 17.45
Number of Shares | shares	[1],[12],[14],[22]	3,125,000
Amortized Cost	[1],[12],[14],[22]	$ 2,623
Investments, at fair value	[1],[3],[12],[14],[22]	$ 662
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Midstream
Strike price (in dollars per share) | $ / shares	[2],[16],[18],[24],[25]			$ 17.45
Number of Shares | shares	[2],[16],[18],[24],[25]			3,125,000
Amortized Cost	[2],[16],[18],[24],[25]			$ 2,623
Investments, at fair value	[2],[4],[16],[18],[24],[25]			$ 8
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Rate	[2],[18]			3.90%
Principal amount	[2],[18],[20]			$ 19,125
Amortized Cost	[2],[18]			18,668
Investments, at fair value	[2],[4],[18]			$ 14,401
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Rate	[1],[11],[14],[26],[27]	10.80%
Principal amount	[1],[14],[15],[26],[27]	$ 10,000
Amortized Cost	[1],[14],[26],[27]	9,809
Investments, at fair value	[1],[3],[14],[26],[27]	$ 9,851
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Variable Rate	[1],[11],[12]	9.00%
Floor Rate	[1],[11],[12]	1.50%
Principal amount	[1],[12],[15]	$ 20,000
Amortized Cost	[1],[12]	19,400
Investments, at fair value	[1],[3],[12]	$ 19,400
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Rate	[2],[16],[18],[25]			12.80%
Number of Shares | shares	[2],[16],[18],[25]			2,640,311
Amortized Cost	[2],[16],[18],[25]			$ 73,114
Investments, at fair value	[2],[4],[16],[18],[25]			$ 83,590
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Variable Rate	[2],[16]			5.25%
Floor Rate	[2],[16],[19]			1.00%
Principal amount	[2],[16],[20]			$ 18,659
Amortized Cost	[2],[16]			18,579
Investments, at fair value	[2],[4],[16]			$ 18,847
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Variable Rate	[2],[16],[21]			5.25%
Floor Rate	[2],[16],[19],[21]			1.00%
Principal amount	[2],[16],[20],[21]			$ 11,341
Amortized Cost	[2],[16],[21]			11,341
Investments, at fair value	[2],[4],[16],[21]			$ 11,455
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Variable Rate	[2],[25]			3.25%
Floor Rate	[2],[19],[25]			0.50%
Principal amount	[2],[20],[25]			$ 32,357
Amortized Cost	[2],[25]			32,220
Investments, at fair value	[2],[4],[25]			$ 32,026
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 1
Variable Rate	[1],[11],[26]	4.75%
Floor Rate	[1],[11],[26]	0.80%
Principal amount	[1],[15],[26]	$ 5,760
Amortized Cost	[1],[26]	5,712
Investments, at fair value	[1],[3],[26]	$ 5,761
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 2
Variable Rate	[1],[11],[26]	4.75%
Floor Rate	[1],[11],[26]	0.80%
Principal amount	[1],[15],[26]	$ 43,579
Amortized Cost	[1],[26]	43,217
Investments, at fair value	[1],[3],[26]	43,585
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Variable Rate	[2]			4.75%
Floor Rate	[2],[19]			0.80%
Principal amount	[2],[20]			$ 5,760
Amortized Cost	[2]			5,708
Investments, at fair value	[2],[4]			$ 5,700
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Variable Rate	[2]			4.75%
Floor Rate	[2],[19]			0.80%
Principal amount	[2],[20]			$ 43,910
Amortized Cost	[2]			43,513
Investments, at fair value	[2],[4]			$ 43,285
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Variable Rate	[2],[16],[25]			6.75%
Floor Rate	[2],[16],[19],[25]			1.50%
Principal amount	[2],[16],[20],[25]			$ 13,545
Amortized Cost	[2],[16],[25]			13,528
Investments, at fair value	[2],[4],[16],[25]			$ 13,394
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Variable Rate	[2],[16],[21]			6.75%
Floor Rate	[2],[16],[19],[21]			1.50%
Principal amount	[2],[16],[20],[21]			$ 1,505
Amortized Cost	[2],[16],[21]			1,505
Investments, at fair value	[2],[4],[16],[21]			1,488
Investment, Identifier [Axis]: Permian Production Holdings, LLC
Investments, at fair value		4,840		4,767		7,889
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity
Investments, at fair value		$ 6,103		$ 11,420		8,829
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Energy—Upstream
Number of Shares | shares	[1],[12],[22],[29],[37]	1,968,861
Amortized Cost	[1],[12],[22],[29],[37]	$ 5
Investments, at fair value	[1],[3],[12],[22],[29],[37]	$ 6,103
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Upstream
Number of Shares | shares	[2],[16],[25],[31],[38]			1,968,861
Amortized Cost	[2],[16],[25],[31],[38]			$ 5
Investments, at fair value	[2],[4],[16],[25],[31],[38]			$ 11,420
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Rate	[1],[11],[12],[37]	7.00%
PIK Rate	[1],[11],[12],[37]	2.00%
Max PIK Rate	[1],[11],[12],[37]	2.00%
Principal amount	[1],[12],[15],[37]	$ 4,840
Amortized Cost	[1],[12],[37]	4,437
Investments, at fair value	[1],[3],[12],[37]	$ 4,840
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Rate	[2],[16],[25],[38]			7.00%
PIK Rate	[2],[16],[25],[38]			2.00%
Max PIK Rate	[2],[16],[25],[38]			2.00%
Principal amount	[2],[16],[20],[25],[38]			$ 4,767
Amortized Cost	[2],[16],[25],[38]			4,266
Investments, at fair value	[2],[4],[16],[25],[38]			$ 4,767
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Rate	[2]			7.80%
Principal amount	[2],[20]			$ 26,365
Amortized Cost	[2]			27,511
Investments, at fair value	[2],[4]			$ 25,703
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Rate	[2],[25]			5.90%
Principal amount	[2],[20],[25]			$ 5,200
Amortized Cost	[2],[25]			5,257
Investments, at fair value	[2],[4],[25]			$ 4,473
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Variable Rate	[1],[11],[26],[27]	3.50%
Principal amount	[1],[15],[26],[27]	$ 9,974
Amortized Cost	[1],[26],[27]	9,971
Investments, at fair value	[1],[3],[26],[27]	$ 9,940
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Energy—Midstream
Variable Rate	[1],[11],[12],[26]	6.75%
Floor Rate	[1],[11],[12],[26]	1.00%
Principal amount	[1],[12],[15],[26]	$ 9,370
Amortized Cost	[1],[12],[26]	9,340
Investments, at fair value	[1],[3],[12],[26]	$ 9,759
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Variable Rate	[2],[16]			6.75%
Floor Rate	[2],[16],[19]			1.00%
Principal amount	[2],[16],[20]			$ 9,370
Amortized Cost	[2],[16]			9,304
Investments, at fair value	[2],[4],[16]			$ 9,310
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Variable Rate	[2],[16],[21]			6.75%
Floor Rate	[2],[16],[19],[21]			1.00%
Principal amount	[2],[16],[20],[21]			$ 2,477
Amortized Cost	[2],[16],[21]			2,477
Investments, at fair value	[2],[4],[16],[21]			$ 2,461
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Rate	[1],[11],[12],[22],[32]	6.00%
PIK Rate	[1],[11],[12],[22],[32]	9.50%
Max PIK Rate	[1],[11],[12],[22],[32]	9.50%
Principal amount	[1],[12],[15],[22],[32]	$ 13,297
Amortized Cost	[1],[12],[22],[32]	12,329
Investments, at fair value	[1],[3],[12],[22],[32]	$ 8,561
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
PIK Rate	[1],[11],[12],[22],[32]	10.00%
Max PIK Rate	[1],[11],[12],[22],[32]	10.00%
Principal amount	[1],[12],[15],[22],[32]	$ 4,015
Amortized Cost	[1],[12],[22],[32]	3,827
Investments, at fair value	[1],[3],[12],[22],[32]	$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Rate	[1],[11],[12],[34]	10.00%
Principal amount	[1],[12],[15],[34]	$ 2,709
Amortized Cost	[1],[12],[34]	2,709
Investments, at fair value	[1],[3],[12],[34]	$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Rate	[2],[16],[21]			10.00%
Principal amount	[2],[16],[20],[21]			$ 2,709
Amortized Cost	[2],[16],[21]			2,709
Investments, at fair value	[2],[4],[16],[21]			$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Rate	[2],[16],[25]			6.00%
PIK Rate	[2],[16],[25]			9.50%
Max PIK Rate	[2],[16],[25]			9.50%
Principal amount	[2],[16],[20],[25]			$ 12,121
Amortized Cost	[2],[16],[25]			12,121
Investments, at fair value	[2],[4],[16],[25]			$ 9,997
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
PIK Rate	[2],[16],[25]			10.00%
Max PIK Rate	[2],[16],[25]			10.00%
Principal amount	[2],[16],[20],[25]			$ 3,643
Amortized Cost	[2],[16],[25]			3,643
Investments, at fair value	[2],[4],[16],[25]			$ 0
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Energy—Power
Variable Rate	[1],[11],[12],[26]	6.00%
Floor Rate	[1],[11],[12],[26]	0.50%
Principal amount	[1],[12],[15],[26]	$ 57,869
Amortized Cost	[1],[12],[26]	57,133
Investments, at fair value	[1],[3],[12],[26]	$ 53,702
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Variable Rate	[2],[16]			6.00%
Floor Rate	[2],[16],[19]			0.50%
Principal amount	[2],[16],[20]			$ 58,459
Amortized Cost	[2],[16]			57,508
Investments, at fair value	[2],[4],[16]			$ 58,443
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Variable Rate	[1],[11],[26],[27]	4.00%
Floor Rate	[1],[11],[26],[27]	1.00%
Principal amount	[1],[15],[26],[27]	$ 9,975
Amortized Cost	[1],[26],[27]	10,012
Investments, at fair value	[1],[3],[26],[27]	9,996
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Rate	[2],[18]			9.30%
Principal amount	[2],[18],[20]			$ 29,772
Amortized Cost	[2],[18]			29,633
Investments, at fair value	[2],[4],[18]			29,678
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity
Investments, at fair value		$ 0		$ 41,851		48,356
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity, Upstream
Number of Shares | shares	[2],[16],[18],[25],[38],[39]			9,599,928
Amortized Cost	[2],[16],[18],[25],[38],[39]			$ 46,599
Investments, at fair value	[2],[4],[16],[18],[25],[38],[39]			$ 41,851
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Variable Rate	[1],[11],[26]	3.50%
Floor Rate	[1],[11],[26]	0.50%
Principal amount	[1],[15],[26]	$ 9,975
Amortized Cost	[1],[26]	9,883
Investments, at fair value	[1],[3],[26]	$ 9,889
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Rate	[1],[11],[12],[26]	6.30%
Principal amount	[1],[12],[15],[26]	$ 10,419
Amortized Cost	[1],[12],[26]	9,999
Investments, at fair value	[1],[3],[12],[26]	$ 9,780
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Rate	[2],[16]			6.30%
Principal amount	[2],[16],[20]			$ 10,526
Amortized Cost	[2],[16]			10,064
Investments, at fair value	[2],[4],[16]			$ 10,074
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Rate	[2],[16],[24],[25],[31],[33]			13.10%
Number of Shares | shares	[2],[16],[24],[25],[31],[33]			70,297
Amortized Cost	[2],[16],[24],[25],[31],[33]			$ 99,766
Investments, at fair value	[2],[4],[16],[24],[25],[31],[33]			$ 83,647
Investment, Identifier [Axis]: SilverBow Resources, Inc., Energy—Upstream
Variable Rate	[1],[11],[12],[14]	7.50%
Floor Rate	[1],[11],[12],[14]	1.00%
Principal amount	[1],[12],[14],[15]	$ 14,250
Amortized Cost	[1],[12],[14]	14,217
Investments, at fair value	[1],[3],[12],[14]	$ 14,250
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Variable Rate	[2],[16],[18],[25]			7.50%
Floor Rate	[2],[16],[18],[19],[25]			1.00%
Principal amount	[2],[16],[18],[20],[25]			$ 14,250
Amortized Cost	[2],[16],[18],[25]			14,199
Investments, at fair value	[2],[4],[16],[18],[25]			$ 14,322
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Energy—Upstream
Variable Rate	[1],[11],[12],[14],[26]	5.75%
Floor Rate	[1],[11],[12],[14],[26]	1.50%
Principal amount	[1],[12],[14],[15],[26]	$ 18,000
Amortized Cost	[1],[12],[14],[26]	17,866
Investments, at fair value	[1],[3],[12],[14],[26]	18,284
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Variable Rate	[2],[16],[18],[25]			6.50%
Floor Rate	[2],[16],[18],[19],[25]			1.50%
Principal amount	[2],[16],[18],[20],[25]			$ 19,500
Amortized Cost	[2],[16],[18],[25]			19,318
Investments, at fair value	[2],[4],[16],[18],[25]			$ 19,256
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Rate	[2],[18],[25]			5.00%
Principal amount	[2],[18],[20],[25]			$ 7,590
Amortized Cost	[2],[18],[25]			7,837
Investments, at fair value	[2],[4],[18],[25]			6,461
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC 2
Investments, at fair value		49,192		51,098		50,770
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Principal amount	[1],[12],[14],[15],[22],[30]	60,603
Amortized Cost	[1],[12],[14],[22],[30]	54,514
Investments, at fair value	[1],[3],[12],[14],[22],[30]	$ 49,192
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Principal amount	[2],[6],[16],[23]			60,603
Amortized Cost	[2],[6],[16],[23]			54,514
Investments, at fair value	[2],[4],[6],[16],[23]			$ 51,098
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Limited, Common Equity, Service & Equipment
Number of Shares | shares	[2],[16],[18],[24],[25],[40]			3,750,000
Amortized Cost	[2],[16],[18],[24],[25],[40]			$ 6,029
Investments, at fair value	[2],[4],[16],[18],[24],[25],[40]			$ 3,131
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Variable Rate	[1],[11],[26]	5.50%
Floor Rate	[1],[11],[26]	1.00%
Principal amount	[1],[15],[26]	$ 10,240
Amortized Cost	[1],[26]	9,612
Investments, at fair value	[1],[3],[26]	9,844
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Rate	[2],[25]			6.00%
Principal amount	[2],[20],[25]			$ 19,761
Amortized Cost	[2],[25]			19,676
Investments, at fair value	[2],[4],[25]			18,480
Investment, Identifier [Axis]: Telpico, LLC, Common Equity
Investments, at fair value		$ 0		$ 0		0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Energy—Upstream
Number of Shares | shares	[1],[12],[22],[29],[37]	50
Amortized Cost	[1],[12],[22],[29],[37]	$ 0
Investments, at fair value	[1],[3],[12],[22],[29],[37]	$ 0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Upstream
Number of Shares | shares	[2],[16],[24],[25],[31],[38]			50
Amortized Cost	[2],[16],[24],[25],[31],[38]			$ 0
Investments, at fair value	[2],[4],[16],[24],[25],[31],[38]			$ 0
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Energy—Upstream
Number of Shares | shares	[1],[12],[22],[29]	50
Amortized Cost	[1],[12],[22],[29]	$ 7,571
Investments, at fair value	[1],[3],[12],[22],[29]	$ 4,790
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Upstream
Number of Shares | shares	[2],[16],[24],[25],[31]			50
Amortized Cost	[2],[16],[24],[25],[31]			$ 7,571
Investments, at fair value	[2],[4],[16],[24],[25],[31]			$ 6,801
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Variable Rate	[1],[11],[12],[26]	7.50%
Max PIK Rate	[1],[11],[12],[26]	9.50%
Floor Rate	[1],[11],[12],[26]	1.00%
Principal amount	[1],[12],[15],[26]	$ 20,537
Amortized Cost	[1],[12],[26]	20,537
Investments, at fair value	[1],[3],[12],[26]	$ 19,972
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Variable Rate	[2],[16],[25]			7.50%
Max PIK Rate	[2],[16],[25]			9.50%
Floor Rate	[2],[16],[19],[25]			1.00%
Principal amount	[2],[16],[20],[25]			$ 20,537
Amortized Cost	[2],[16],[25]			20,537
Investments, at fair value	[2],[4],[16],[25]			$ 20,537
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Variable Rate	[2]			4.25%
Floor Rate	[2],[19]			1.00%
Principal amount	[2],[20]			$ 28,436
Amortized Cost	[2]			28,484
Investments, at fair value	[2],[4]			$ 28,418
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Variable Rate	[1],[11],[26]	4.00%
Floor Rate	[1],[11],[26]	0.80%
Principal amount	[1],[15],[26]	$ 9,962
Amortized Cost	[1],[26]	9,245
Investments, at fair value	[1],[3],[26]	$ 9,493
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Energy—Midstream
Number of Shares | shares	[1],[14]	84,779
Amortized Cost	[1],[14]	$ 1,617
Investments, at fair value	[1],[3],[14]	$ 2,023
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Midstream
Number of Shares | shares	[2],[18],[24],[25]			84,779
Amortized Cost	[2],[18],[24],[25]			$ 1,617
Investments, at fair value	[2],[4],[18],[24],[25]			$ 1,655
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Rate	[1],[11],[12],[14],[26]	9.80%
Number of Shares | shares	[1],[12],[14],[26]	79,336
Amortized Cost	[1],[12],[14],[26]	$ 78,091
Investments, at fair value	[1],[3],[12],[14],[26]	$ 98,773
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Rate	[2],[16]			9.80%
Number of Shares | shares	[2],[16]			79,336
Amortized Cost	[2],[16]			$ 77,943
Investments, at fair value	[2],[4],[16]			$ 90,479
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Energy—Midstream
Strike price (in dollars per share) | $ / shares	[1],[12],[14],[22]	$ 19.59
Number of Shares | shares	[1],[12],[14],[22]	1,586,719
Amortized Cost	[1],[12],[14],[22]	$ 714
Investments, at fair value	[1],[3],[12],[14],[22]	9,552
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Midstream
Strike price (in dollars per share) | $ / shares	[2],[16],[18],[24],[25]			$ 19.59
Number of Shares | shares	[2],[16],[18],[24],[25]			1,586,719
Amortized Cost	[2],[16],[18],[24],[25]			$ 714
Investments, at fair value	[2],[4],[16],[18],[24],[25]			5,711
Investment, Identifier [Axis]: Warren Resources, Inc.
Investments, at fair value		23,763		23,584		23,688
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity
Investments, at fair value		$ 18,193		$ 36,982		$ 25,854
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Energy—Upstream
Number of Shares | shares	[1],[12],[22],[30]	4,415,749
Amortized Cost	[1],[12],[22],[30]	$ 20,754
Investments, at fair value	[1],[3],[12],[22],[30]	$ 18,193
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Upstream
Number of Shares | shares	[2],[16],[23],[24],[25]			4,415,749
Amortized Cost	[2],[16],[23],[24],[25]			$ 20,754
Investments, at fair value	[2],[4],[16],[23],[24],[25]			$ 36,982
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Variable Rate	[1],[11],[12],[26],[30]	9.00%
PIK Rate	[1],[11],[12],[26],[30]	1.00%
Max PIK Rate	[1],[11],[12],[26],[30]	1.00%
Floor Rate	[1],[11],[12],[26],[30]	1.00%
Principal amount	[1],[12],[15],[26],[30]	$ 23,763
Amortized Cost	[1],[12],[26],[30]	23,763
Investments, at fair value	[1],[3],[12],[26],[30]	$ 23,763
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Variable Rate	[2],[16],[23]			9.00%
PIK Rate	[2],[16],[23]			1.00%
Max PIK Rate	[2],[16],[23]			1.00%
Floor Rate	[2],[16],[19],[23]			1.00%
Principal amount	[2],[16],[20],[23]			$ 23,584
Amortized Cost	[2],[16],[23]			23,584
Investments, at fair value	[2],[4],[16],[23]			$ 23,584
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Variable Rate	[1],[11],[12],[26]	9.85%
Floor Rate	[1],[11],[12],[26]	1.80%
Principal amount	[1],[12],[15],[26]	$ 42,938
Amortized Cost	[1],[12],[26]	42,938
Investments, at fair value	[1],[3],[12],[26]	$ 41,839
Investment, Identifier [Axis]: Wattbridge Inc., Power
Variable Rate	[2],[16]			7.85%
Floor Rate	[2],[16],[19]			1.80%
Principal amount	[2],[16],[20]			$ 42,500
Amortized Cost	[2],[16]			42,500
Investments, at fair value	[2],[4],[16]			$ 41,880

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] Security may be an obligation of one or more entities affiliated with the named company.

[3] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[5] Includes the effect of swap contracts.

[6] Includes the effect of swap contracts.

[7] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[8] Represents the amounts the Company would pay or receive under each swap contract if it were to settle on September 30, 2023 (see Note 6).

[9] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[10] Represents the amounts the Company would pay or receive under each swap contract if it were to settle on December 31, 2022 (see Note 6).

[11] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023, the Secured Overnight Financing Rate, or SOFR, or S, was 5.40% and the Overnight Bank Funding Rate, or OBFR, was 5.32%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

[12] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[13] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[14] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of September 30, 2023, 76.5% of the Company’s total assets represented qualifying assets.

[15] Denominated in U.S. dollars, unless otherwise noted.

[16] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[17] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[18] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.

[19] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2022, the three-month London Interbank Offered Rate, or LIBOR, or L, was 4.77% and the Secured Overnight Financing Rate, or SOFR, or S, was 4.59%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

[20] Denominated in U.S. dollars, unless otherwise noted.

[21] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[22] Security is non-income producing.

[23] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Dividend Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC(4) $7,782 $654 $— $— $— $8,436 $— $654 $— Allied Wireline Services, LLC46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC22,745 455 (23,200)— — — — 455 — Warren Resources, Inc.23,688 237 (341)— — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC50,770 — — — 328 51,098 — — 735 Equity/OtherAllied Wireline Services, LLC, Common Equity— — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants— — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units4,181 — (18,060)15,899 (2,020)— — — — Warren Resources, Inc., Common Equity25,854 — — — 11,128 36,982 — — — $181,359 $7,154 $(41,601)$15,899 $31,640 $194,451 $2,936 $7,154 $735  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK and dividend income presented for the year ended December 31, 2022. (4)    Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[24] Security is non-income producing.

[25] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).

[26] Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).

[27] Security or portion thereof unsettled as of September 30, 2023.

[28] Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[29] Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

[30] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $8,436 $138 $(8,574)$— $— $— $256 $139 Allied Wireline Services, LLC63,888 6,389 — — (33,101)37,176 2,910 — Warren Resources, Inc.23,584 23,882 (23,703)— — 23,763 2,521 179 Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC51,098 — — — (1,906)49,192 — — Equity/OtherAllied Wireline Services, LLC, Common Equity10,463 — — — (10,463)— — — Allied Wireline Services, LLC, Warrants— — — — — — — — Warren Resources, Inc., Common Equity36,982 — — — (18,789)18,193 — — $194,451 $30,409 $(32,277)$— $(64,259)$128,324 $5,687 $318  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[31] Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

[32] Security was on non-accrual status as of September 30, 2023.

[33] Security was on non-accrual status as of December 31, 2022.

[34] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[35] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[36] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[37] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First LienPermian Production Holdings, LLC$4,767 $171 $— $— $(98)$4,840 $398 $73 Equity/OtherGWP Midstream Holdco, LLC, Common Equity5,044 — — — (3,631)1,413 — — Harvest Oil & Gas Corp., Common Equity810 — (641)— 506 675 — — Limetree Bay Energy, LLC, Class A Units1,885 246 — (21,704)19,573 — — — Permian Production Holdings, LLC, Common Equity11,420 — — — (5,317)6,103 — — Ridgeback Resources Inc., Common Equity41,851 — (35,240)(11,359)4,748 — — — Telpico, LLC, Common Equity— — — — — — — — $65,777 $417 $(35,881)$(33,063)$15,781 $13,031 $398 $73  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[38] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Senior Secured Loans—First LienLimetree Bay Energy, LLC$3,166 $— $(1,587)$(12,756)$11,177 $— $— $— $— $— Permian Production Holdings, LLC7,889 697 (3,674)551 (696)4,767 570 105 — — Senior Secured BondsGreat Western Petroleum, LLC58,055 96 (55,096)1,087 (4,142)— 2,649 — 7,268 — Equity/OtherGreat Western Petroleum, LLC, Common Equity40,731 — (84,871)54,081 (9,941)— — — — — GWP Midstream Holdco, LLC, Common Equity— 6,681 — — (1,637)5,044 — — — — Harvest Oil & Gas Corp., Common Equity2,836 — (743)— (1,283)810 — — — — Limetree Bay Energy, LLC, Class A Units6,046 1,795 — — (5,956)1,885 — — — — Permian Production Holdings, LLC, Common Equity8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity48,356 — (12,559)173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity— — — — — — — — — — $175,908 $9,273 $(158,530)$43,136 $(4,010)$65,777 $3,219 $105 $7,268 $5,417  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

[39] Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

[40] Investment denominated in British pounds. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

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Unaudited Consolidated Schedule of Investments (Parenthetical) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended			12 Months Ended
		Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Qualifying assets, percent of total assets		76.50%			76.50%			77.50%
Unfunded commitment with amortized cost								$ 2,500
Investment company, financial commitment fair value								2,500
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				$ 2,047,115
Net realized gain (loss) on investments:					(56,305)		$ 36,770
Net change in unrealized appreciation (depreciation) on investments:					(84,491)		80,592
Fair Value, ending balance		$ 1,492,766	[3],[4]		1,492,766	[3],[4]		2,047,115	[1],[2]
Paid-in-kind interest income					14,174		18,268
Fee income					591		0
Non-Controlled/Affiliated
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					65,777		175,908	175,908
Gross Additions					417	[5]		9,273	[6]
Gross Reductions					(35,881)	[7]		(158,530)	[8]
Net realized gain (loss) on investments:		(163)		$ 718	(33,063)		41,922	43,136
Net change in unrealized appreciation (depreciation) on investments:		253		(13,142)	15,781		(11,013)	(4,010)
Fair Value, ending balance		13,031			13,031			65,777
Interest Income					398	[9]		3,219	[10]
Paid-in-kind interest income		25		24	73	[9]	81	105	[10]
Fee income		0		0	0		7,268	7,268	[10]
Dividend income		0		0	0		5,417	5,417
Controlled/affiliated
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					194,451		181,359	181,359
Gross Additions					30,409	[11]		7,154	[12]
Gross Reductions					(32,277)	[13]		(41,601)	[14]
Net realized gain (loss) on investments:		0		1,662	0		12,520	15,899
Net change in unrealized appreciation (depreciation) on investments:		(53,363)		344	(64,259)		13,130	31,640
Fair Value, ending balance		128,324			128,324			194,451
Interest Income					5,687	[15]		2,936	[16]
Paid-in-kind interest income		86		226	318	[15]	1,117	7,154	[16]
Dividend income		$ 0		$ 0	$ 0		735	$ 735	[16]
London Interbank Offered Rate (LIBOR)
Derivative [Line Items]
Investment, variable rate								4.77%
Overnight Bank Funding Rate
Derivative [Line Items]
Investment, variable rate		5.32%			5.32%
Secured Overnight Financing Rate
Derivative [Line Items]
Investment, variable rate		5.40%			5.40%			4.59%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[18],[19]	$ 22,878			$ 22,878
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[21],[22]				23,519
Fair Value, ending balance	[1],[2],[20],[21],[22]							$ 23,519
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[21],[22],[23]				5,545
Fair Value, ending balance	[1],[2],[20],[21],[22],[23]							5,545
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[18],[19],[24]	187			187
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[21],[22],[25],[26]				1,630
Fair Value, ending balance	[1],[2],[20],[21],[22],[25],[26]							1,630
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24]	1,521			1,521
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26]				1,219
Fair Value, ending balance	[1],[2],[20],[25],[26]							1,219
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24]	11,027			11,027
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26]				8,321
Fair Value, ending balance	[1],[2],[20],[25],[26]							8,321
Investment, Identifier [Axis]: Acrisure LLC, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	11,275			11,275
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				20,138
Fair Value, ending balance	[1],[2],[20],[26]							20,138
Investment, Identifier [Axis]: Aethon United BR LP, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4]	40,219			40,219
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[26]				40,221
Fair Value, ending balance	[1],[2],[26]							40,221
Investment, Identifier [Axis]: AirSwift Holdings, Ltd., Common Equity, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24]	3,075			3,075
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[29]				8,436		7,782	7,782
Gross Additions					138	[11]		654	[12],[29]
Gross Reductions					(8,574)	[13]		0	[14],[29]
Net realized gain (loss) on investments:					0			0	[29]
Net change in unrealized appreciation (depreciation) on investments:					0			0	[29]
Fair Value, ending balance		0			0			8,436	[29]
Interest Income					256	[15]		0	[16],[29]
Paid-in-kind interest income					139	[15]		654	[16],[29]
Dividend income	[16],[29]							0
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26],[30]				8,436
Fair Value, ending balance	[1],[2],[20],[26],[30]							8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[23],[30]				2,500
Fair Value, ending balance	[1],[2],[20],[23],[30]							2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	5,431			5,431
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	9,631			9,631
Investment, Identifier [Axis]: Allied Wireline Services, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					63,888		46,339	46,339
Gross Additions					6,389	[11]		5,808	[12]
Gross Reductions					0	[13]		0	[14]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					(33,101)			11,741
Fair Value, ending balance		37,176			37,176			63,888
Interest Income					2,910	[15]		316	[16]
Paid-in-kind interest income					0	[15]		5,808	[16]
Dividend income	[16]							0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					10,463		0	0
Gross Additions					0	[11]		0	[12]
Gross Reductions					0	[13]		0	[14]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					(10,463)			10,463
Fair Value, ending balance		0			0			10,463
Interest Income					0	[15]		0	[16]
Paid-in-kind interest income					0	[15]		0	[16]
Dividend income	[16]							0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[31],[32]	0			0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[30],[33]				10,463
Fair Value, ending balance	[1],[2],[20],[25],[26],[30],[33]							10,463
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[27],[32],[34]	37,176			37,176
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26],[30]				63,888
Fair Value, ending balance	[1],[2],[20],[26],[30]							63,888
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					0		0	0
Gross Additions					0	[11]		0	[12]
Gross Reductions					0	[13]		0	[14]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					0			0
Fair Value, ending balance		0			0			0
Interest Income					0	[15]		0	[16]
Paid-in-kind interest income					0	[15]		0	[16]
Dividend income	[16]							0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[31],[32]	0			0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[30],[33]				0
Fair Value, ending balance	[1],[2],[20],[25],[26],[30],[33]							0
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[22],[26]				2,840
Fair Value, ending balance	[1],[2],[22],[26]							2,840
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17]	472			472
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26]				858
Fair Value, ending balance	[1],[2],[20],[25],[26]							858
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[31]	41,357			41,357
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[33]				52,340
Fair Value, ending balance	[1],[2],[20],[25],[26],[33]							52,340
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	8,986			8,986
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	14,992			14,992
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				39,137
Fair Value, ending balance	[1],[2]							39,137
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4]	808			808
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				14,155
Fair Value, ending balance	[1],[2]							14,155
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	21,136			21,136
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				21,935
Fair Value, ending balance	[1],[2]							21,935
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Common Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26]				0
Fair Value, ending balance	[1],[2],[20],[25],[26]							0
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Participation Option, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26]				0
Fair Value, ending balance	[1],[2],[20],[25],[26]							0
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[35]				3,713
Fair Value, ending balance	[1],[2],[20],[25],[26],[35]							3,713
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	20,968			20,968
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[36]	2,688			2,688
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[36]	1,344			1,344
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	35,377			35,377
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				38,240
Fair Value, ending balance	[1],[2],[20],[26]							38,240
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				31,384
Fair Value, ending balance	[1],[2]							31,384
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[37],[38]	4,275			4,275
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[39],[40]				20,683
Fair Value, ending balance	[1],[2],[20],[39],[40]							20,683
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				26,075
Fair Value, ending balance	[1],[2]							26,075
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				36,656
Fair Value, ending balance	[1],[2],[20],[26]							36,656
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[22]				10,920
Fair Value, ending balance	[1],[2],[22]							10,920
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[26]				23,306
Fair Value, ending balance	[1],[2],[26]							23,306
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	9,936			9,936
Investment, Identifier [Axis]: FR BR Holdings LLC, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17]	80,405			80,405
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				81,361
Fair Value, ending balance	[1],[2],[20],[26]							81,361
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	17,267			17,267
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				17,406
Fair Value, ending balance	[1],[2],[20]							17,406
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	9,849			9,849
Investment, Identifier [Axis]: GIP II Blue Holding LP, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	3,151			3,151
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				5,877
Fair Value, ending balance	[1],[2]							5,877
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					5,044		0	0
Gross Additions					0	[5]		6,681	[6]
Gross Reductions					0	[7]		0	[8]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					(3,631)			(1,637)
Fair Value, ending balance		1,413			1,413			5,044
Interest Income					0	[9]		0	[10]
Paid-in-kind interest income					0	[9]		0	[10]
Fee income	[10]							0
Dividend income								0
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[31],[41]	1,413			1,413
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[33],[42]				5,044
Fair Value, ending balance	[1],[2],[20],[25],[26],[33],[42]							5,044
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19]	13,263			13,263
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22]				14,010
Fair Value, ending balance	[1],[2],[20],[22]							14,010
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				7,385
Fair Value, ending balance	[1],[2]							7,385
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				162
Fair Value, ending balance	[1],[2]							162
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24]	0			0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[34]	9,494			9,494
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Industrials 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26]				0
Fair Value, ending balance	[1],[2],[20],[25],[26]							0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Industrials 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[35]				9,377
Fair Value, ending balance	[1],[2],[20],[25],[26],[35]							9,377
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	14,587			14,587
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				14,819
Fair Value, ending balance	[1],[2],[20]							14,819
Investment, Identifier [Axis]: Great Western Petroleum, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					0		58,055	58,055
Gross Additions	[6]							96
Gross Reductions	[8]							(55,096)
Net realized gain (loss) on investments:								1,087
Net change in unrealized appreciation (depreciation) on investments:								(4,142)
Fair Value, ending balance								0
Interest Income	[10]							2,649
Paid-in-kind interest income	[10]							0
Fee income	[10]							7,268
Dividend income								0
Investment, Identifier [Axis]: Great Western Petroleum, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					0		40,731	40,731
Gross Additions	[6]							0
Gross Reductions	[8]							(84,871)
Net realized gain (loss) on investments:								54,081
Net change in unrealized appreciation (depreciation) on investments:								(9,941)
Fair Value, ending balance								0
Interest Income	[10]							0
Paid-in-kind interest income	[10]							0
Fee income	[10]							0
Dividend income								0
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	9,999			9,999
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	13,050			13,050
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				31,007
Fair Value, ending balance	[1],[2],[20]							31,007
Investment, Identifier [Axis]: Hammerhead Resources Inc., Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19]	39,459			39,459
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[26]				35,118
Fair Value, ending balance	[1],[2],[20],[22],[26]							35,118
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					810		2,836	2,836
Gross Additions					0	[5]		0	[6]
Gross Reductions					(641)	[7]		(743)	[8]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					506			(1,283)
Fair Value, ending balance		675			675			810
Interest Income					0	[9]		0	[10]
Paid-in-kind interest income					0	[9]		0	[10]
Fee income	[10]							0
Dividend income								0
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[41]	675			675
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[25],[26],[42]				810
Fair Value, ending balance	[1],[2],[25],[26],[42]							810
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	20,297			20,297
Investment, Identifier [Axis]: Limetree Bay Energy, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					0		3,166	3,166
Gross Additions	[6]							0
Gross Reductions	[8]							(1,587)
Net realized gain (loss) on investments:								(12,756)
Net change in unrealized appreciation (depreciation) on investments:								11,177
Fair Value, ending balance								0
Interest Income	[10]							0
Paid-in-kind interest income	[10]							0
Fee income	[10]							0
Dividend income								0
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					1,885		6,046	6,046
Gross Additions					246	[5]		1,795	[6]
Gross Reductions					0	[7]		0	[8]
Net realized gain (loss) on investments:					(21,704)			0
Net change in unrealized appreciation (depreciation) on investments:					19,573			(5,956)
Fair Value, ending balance		0			0			1,885
Interest Income					0	[9]		0	[10]
Paid-in-kind interest income					0	[9]		0	[10]
Fee income	[10]							0
Dividend income								0
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[42]				1,885
Fair Value, ending balance	[1],[2],[20],[25],[26],[42]							1,885
Investment, Identifier [Axis]: MB Precision Investment Holdings LLC, Class A-2 Units, Industrials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[33]				0
Fair Value, ending balance	[1],[2],[20],[25],[26],[33]							0
Investment, Identifier [Axis]: MECO IV Holdco, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					0		22,745	22,745
Gross Additions	[12]							455
Gross Reductions	[14]							(23,200)
Net realized gain (loss) on investments:								0
Net change in unrealized appreciation (depreciation) on investments:								0
Fair Value, ending balance								0
Interest Income	[16]							0
Paid-in-kind interest income	[16]							455
Dividend income	[16]							0
Investment, Identifier [Axis]: MECO IV Holdco, LLC, Class A-1 Units
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					0		4,181	4,181
Gross Additions	[12]							0
Gross Reductions	[14]							(18,060)
Net realized gain (loss) on investments:								15,899
Net change in unrealized appreciation (depreciation) on investments:								(2,020)
Fair Value, ending balance								0
Interest Income	[16]							0
Paid-in-kind interest income	[16]							0
Dividend income	[16]							0
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[31]	250,421			250,421
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26],[33]				312,372
Fair Value, ending balance	[1],[2],[20],[26],[33]							312,372
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, LP, Consumer Discretionary Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	14,925			14,925
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				7,862
Fair Value, ending balance	[1],[2]							7,862
Investment, Identifier [Axis]: Meritage Midstream Services II, LLC, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17]	22,409			22,409
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4]	11,340			11,340
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[26]				10,561
Fair Value, ending balance	[1],[2],[26]							10,561
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24],[27],[34]	139,911			139,911
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[25],[26],[35]				125,000
Fair Value, ending balance	[1],[2],[20],[22],[25],[26],[35]							125,000
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[25],[26]				3
Fair Value, ending balance	[1],[2],[20],[22],[25],[26]							3
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24]	695			695
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[25],[26]				10
Fair Value, ending balance	[1],[2],[20],[22],[25],[26]							10
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike:$13.56, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24]	168			168
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24]	173			173
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[25],[26]				2
Fair Value, ending balance	[1],[2],[20],[22],[25],[26]							2
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24]	662			662
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[25],[26]				8
Fair Value, ending balance	[1],[2],[20],[22],[25],[26]							8
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[22]				14,401
Fair Value, ending balance	[1],[2],[22]							14,401
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[19],[27],[28]	9,851			9,851
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17]	19,400			19,400
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[26]				83,590
Fair Value, ending balance	[1],[2],[20],[22],[26]							83,590
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				18,847
Fair Value, ending balance	[1],[2],[20]							18,847
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[23]				11,455
Fair Value, ending balance	[1],[2],[20],[23]							11,455
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[26]				32,026
Fair Value, ending balance	[1],[2],[26]							32,026
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	5,761			5,761
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	43,585			43,585
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				5,700
Fair Value, ending balance	[1],[2]							5,700
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				43,285
Fair Value, ending balance	[1],[2]							43,285
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				13,394
Fair Value, ending balance	[1],[2],[20],[26]							13,394
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[23]				1,488
Fair Value, ending balance	[1],[2],[20],[23]							1,488
Investment, Identifier [Axis]: Permian Production Holdings, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					4,767		7,889	7,889
Gross Additions					171	[5]		697	[6]
Gross Reductions					0	[7]		(3,674)	[8]
Net realized gain (loss) on investments:					0			551
Net change in unrealized appreciation (depreciation) on investments:					(98)			(696)
Fair Value, ending balance		4,840			4,840			4,767
Interest Income					398	[9]		570	[10]
Paid-in-kind interest income					73	[9]		105	[10]
Fee income	[10]							0
Dividend income								0
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					11,420		8,829	8,829
Gross Additions					0	[5]		4	[6]
Gross Reductions					0	[7]		0	[8]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					(5,317)			2,587
Fair Value, ending balance		6,103			6,103			11,420
Interest Income					0	[9]		0	[10]
Paid-in-kind interest income					0	[9]		0	[10]
Fee income	[10]							0
Dividend income								1,726
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[31],[41]	6,103			6,103
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26],[33],[42]				11,420
Fair Value, ending balance	[1],[2],[20],[26],[33],[42]							11,420
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[41]	4,840			4,840
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26],[42]				4,767
Fair Value, ending balance	[1],[2],[20],[26],[42]							4,767
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				25,703
Fair Value, ending balance	[1],[2]							25,703
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[26]				4,473
Fair Value, ending balance	[1],[2],[26]							4,473
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	9,940			9,940
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	9,759			9,759
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				9,310
Fair Value, ending balance	[1],[2],[20]							9,310
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[23]				2,461
Fair Value, ending balance	[1],[2],[20],[23]							2,461
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[34]	8,561			8,561
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[34]	0			0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[36]	0			0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[23]				0
Fair Value, ending balance	[1],[2],[20],[23]							0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				9,997
Fair Value, ending balance	[1],[2],[20],[26]							9,997
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				0
Fair Value, ending balance	[1],[2],[20],[26]							0
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	53,702			53,702
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				58,443
Fair Value, ending balance	[1],[2],[20]							58,443
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27],[28]	9,996			9,996
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[22]				29,678
Fair Value, ending balance	[1],[2],[22]							29,678
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					41,851		48,356	48,356
Gross Additions					0	[5]		0	[6]
Gross Reductions					(35,240)	[7]		(12,559)	[8]
Net realized gain (loss) on investments:					(11,359)			173
Net change in unrealized appreciation (depreciation) on investments:					4,748			5,881
Fair Value, ending balance		0			0			41,851
Interest Income					0	[9]		0	[10]
Paid-in-kind interest income					0	[9]		0	[10]
Fee income	[10]							0
Dividend income								3,691
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[26],[42],[43]				41,851
Fair Value, ending balance	[1],[2],[20],[22],[26],[42],[43]							41,851
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	9,889			9,889
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	9,780			9,780
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				10,074
Fair Value, ending balance	[1],[2],[20]							10,074
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[33],[35]				83,647
Fair Value, ending balance	[1],[2],[20],[25],[26],[33],[35]							83,647
Investment, Identifier [Axis]: SilverBow Resources, Inc., Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19]	14,250			14,250
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[26]				14,322
Fair Value, ending balance	[1],[2],[20],[22],[26]							14,322
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[27]	18,284			18,284
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[26]				19,256
Fair Value, ending balance	[1],[2],[20],[22],[26]							19,256
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[22],[26]				6,461
Fair Value, ending balance	[1],[2],[22],[26]							6,461
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					51,098		50,770	50,770
Gross Additions					0	[11]		0	[12]
Gross Reductions					0	[13]		0	[14]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					(1,906)			328
Fair Value, ending balance		49,192			49,192			51,098
Interest Income					0	[15]		0	[16]
Paid-in-kind interest income					0	[15]		0	[16]
Dividend income	[16]							735
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24],[32]	49,192			49,192
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[30],[44]				51,098
Fair Value, ending balance	[1],[2],[20],[30],[44]							51,098
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Limited, Common Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[25],[26],[45]				3,131
Fair Value, ending balance	[1],[2],[20],[22],[25],[26],[45]							3,131
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	9,844			9,844
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[26]				18,480
Fair Value, ending balance	[1],[2],[26]							18,480
Investment, Identifier [Axis]: Telpico, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					0		0	0
Gross Additions					0	[5]		0	[6]
Gross Reductions					0	[7]		0	[8]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					0			0
Fair Value, ending balance		0			0			0
Interest Income					0	[9]		0	[10]
Paid-in-kind interest income					0	[9]		0	[10]
Fee income	[10]							0
Dividend income								0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[31],[41]	0			0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[33],[42]				0
Fair Value, ending balance	[1],[2],[20],[25],[26],[33],[42]							0
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[31]	4,790			4,790
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[33]				6,801
Fair Value, ending balance	[1],[2],[20],[25],[26],[33]							6,801
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	19,972			19,972
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[26]				20,537
Fair Value, ending balance	[1],[2],[20],[26]							20,537
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2]				28,418
Fair Value, ending balance	[1],[2]							28,418
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[27]	9,493			9,493
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[19]	2,023			2,023
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[22],[25],[26]				1,655
Fair Value, ending balance	[1],[2],[22],[25],[26]							1,655
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[27]	98,773			98,773
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				90,479
Fair Value, ending balance	[1],[2],[20]							90,479
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[19],[24]	9,552			9,552
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[22],[25],[26]				5,711
Fair Value, ending balance	[1],[2],[20],[22],[25],[26]							5,711
Investment, Identifier [Axis]: Warren Resources, Inc.
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					23,584		23,688	23,688
Gross Additions					23,882	[11]		237	[12]
Gross Reductions					(23,703)	[13]		(341)	[14]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					0			0
Fair Value, ending balance		23,763			23,763			23,584
Interest Income					2,521	[15]		2,620	[16]
Paid-in-kind interest income					179	[15]		237	[16]
Dividend income	[16]							0
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance					36,982		$ 25,854	25,854
Gross Additions					0	[11]		0	[12]
Gross Reductions					0	[13]		0	[14]
Net realized gain (loss) on investments:					0			0
Net change in unrealized appreciation (depreciation) on investments:					(18,789)			11,128
Fair Value, ending balance		18,193			18,193			36,982
Interest Income					0	[15]		0	[16]
Paid-in-kind interest income					0	[15]		0	[16]
Dividend income	[16]							0
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[24],[32]	18,193			18,193
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[25],[26],[30]				36,982
Fair Value, ending balance	[1],[2],[20],[25],[26],[30]							36,982
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27],[32]	23,763			23,763
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20],[30]				23,584
Fair Value, ending balance	[1],[2],[20],[30]							23,584
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[3],[4],[17],[27]	$ 41,839			41,839
Investment, Identifier [Axis]: Wattbridge Inc., Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[2],[20]				$ 41,880
Fair Value, ending balance	[1],[2],[20]							$ 41,880

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[5] (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

[6] Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

[7] (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

[8] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

[9] (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[10] Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

[11] (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

[12] Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category.

[13] (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

[14] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category.

[15] (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[16] Interest, PIK and dividend income presented for the year ended December 31, 2022.

[17] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[18] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[19] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of September 30, 2023, 76.5% of the Company’s total assets represented qualifying assets.

[20] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[21] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[22] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.

[23] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[24] Security is non-income producing.

[25] Security is non-income producing.

[26] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).

[27] Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).

[28] Security or portion thereof unsettled as of September 30, 2023.

[29] Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[30] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Dividend Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC(4) $7,782 $654 $— $— $— $8,436 $— $654 $— Allied Wireline Services, LLC46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC22,745 455 (23,200)— — — — 455 — Warren Resources, Inc.23,688 237 (341)— — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC50,770 — — — 328 51,098 — — 735 Equity/OtherAllied Wireline Services, LLC, Common Equity— — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants— — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units4,181 — (18,060)15,899 (2,020)— — — — Warren Resources, Inc., Common Equity25,854 — — — 11,128 36,982 — — — $181,359 $7,154 $(41,601)$15,899 $31,640 $194,451 $2,936 $7,154 $735  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK and dividend income presented for the year ended December 31, 2022. (4)    Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[31] Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

[32] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $8,436 $138 $(8,574)$— $— $— $256 $139 Allied Wireline Services, LLC63,888 6,389 — — (33,101)37,176 2,910 — Warren Resources, Inc.23,584 23,882 (23,703)— — 23,763 2,521 179 Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC51,098 — — — (1,906)49,192 — — Equity/OtherAllied Wireline Services, LLC, Common Equity10,463 — — — (10,463)— — — Allied Wireline Services, LLC, Warrants— — — — — — — — Warren Resources, Inc., Common Equity36,982 — — — (18,789)18,193 — — $194,451 $30,409 $(32,277)$— $(64,259)$128,324 $5,687 $318  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[33] Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

[34] Security was on non-accrual status as of September 30, 2023.

[35] Security was on non-accrual status as of December 31, 2022.

[36] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[37] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[38] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[39] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[40] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[41] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First LienPermian Production Holdings, LLC$4,767 $171 $— $— $(98)$4,840 $398 $73 Equity/OtherGWP Midstream Holdco, LLC, Common Equity5,044 — — — (3,631)1,413 — — Harvest Oil & Gas Corp., Common Equity810 — (641)— 506 675 — — Limetree Bay Energy, LLC, Class A Units1,885 246 — (21,704)19,573 — — — Permian Production Holdings, LLC, Common Equity11,420 — — — (5,317)6,103 — — Ridgeback Resources Inc., Common Equity41,851 — (35,240)(11,359)4,748 — — — Telpico, LLC, Common Equity— — — — — — — — $65,777 $417 $(35,881)$(33,063)$15,781 $13,031 $398 $73  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[42] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Senior Secured Loans—First LienLimetree Bay Energy, LLC$3,166 $— $(1,587)$(12,756)$11,177 $— $— $— $— $— Permian Production Holdings, LLC7,889 697 (3,674)551 (696)4,767 570 105 — — Senior Secured BondsGreat Western Petroleum, LLC58,055 96 (55,096)1,087 (4,142)— 2,649 — 7,268 — Equity/OtherGreat Western Petroleum, LLC, Common Equity40,731 — (84,871)54,081 (9,941)— — — — — GWP Midstream Holdco, LLC, Common Equity— 6,681 — — (1,637)5,044 — — — — Harvest Oil & Gas Corp., Common Equity2,836 — (743)— (1,283)810 — — — — Limetree Bay Energy, LLC, Class A Units6,046 1,795 — — (5,956)1,885 — — — — Permian Production Holdings, LLC, Common Equity8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity48,356 — (12,559)173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity— — — — — — — — — — $175,908 $9,273 $(158,530)$43,136 $(4,010)$65,777 $3,219 $105 $7,268 $5,417  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

[43] Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

[44] Includes the effect of swap contracts.

[45] Investment denominated in British pounds. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

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Principal Business and Organization

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Principal Business and Organization

Principal Business and Organization

FS Specialty Lending Fund, or the Company, was formed as a Delaware statutory trust under the Delaware Statutory Trust Act on September 16, 2010 and formally commenced investment operations on July 18, 2011. Prior to September 29, 2023, the Company’s name was FS Energy and Power Fund. The Company is an externally managed, non-diversified, closed-end management investment company that has elected to be regulated as a business development company, or BDC, under the Investment Company Act of 1940, as amended, or the 1940 Act. In addition, the Company has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a regulated investment company, or RIC, as defined under Subchapter M of the Internal Revenue Code of 1986, as amended, or the Code. The Company has various wholly-owned financing subsidiaries, including special-purpose financing subsidiaries and subsidiaries through which it holds or expects to hold interests in certain portfolio companies. The unaudited consolidated financial statements include both the Company’s accounts and the accounts of its wholly-owned subsidiaries as of September 30, 2023. All significant intercompany transactions have been eliminated in consolidation. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes.

On May 15, 2023, the Company announced that its board of trustees approved the Company’s transition from an investment policy of investing primarily in energy companies to a diversified credit investment policy of investing across private and public credit in a broader set of industries, sectors and sub-sectors. The Company notified its shareholders of the new policy, which became effective on September 29, 2023.

The Company’s current investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation by investing primarily in private and public credit in a broad set of industries, sectors and sub-sectors. The Company’s current investment policy is to invest primarily in a portfolio of secured and unsecured floating and fixed rate loans, bonds and other types of credit instruments, which, under normal circumstances, will represent at least 80% of the Company’s total assets.

Prior to September 29, 2023, the Company’s investment objectives were to generate current income and long-term capital appreciation by investing primarily in privately-held U.S. companies in the energy and power industry. Prior to September 29, 2023, the Company’s investment policy was to invest, under normal circumstances, at least 80% of its total assets in securities of energy and power related, or Energy, companies. The Company considers Energy companies to be those companies that engage in the exploration, development, production, gathering, transportation, processing, storage, refining, distribution, mining, generation or marketing of natural gas, natural gas liquids, crude oil, refined products, coal or power, including those companies that provide equipment or services to companies engaged in any of the foregoing.

The Company commenced transitioning the Company’s portfolio holdings away from Energy investments in May 2023, while remaining in compliance with the Company’s then-current investment policy. The Company’s allocation to Energy investments is expected to decline over time through the natural course of maturities, repayments and sales activity and by growing the total size of the portfolio through leverage facilities. The pace of the portfolio rotation is dependent upon a number of factors, including the turnover of concentrated illiquid Energy investments, performance of underlying portfolio companies, high yield and energy market conditions, the Company’s access to borrowings and the amount and pace of the payment of enhanced distributions to shareholders, among others.

The Company is managed by FS/EIG Advisor, LLC, or FS/EIG Advisor, pursuant to an investment advisory and administrative services agreement, dated as of April 9, 2018, or the FS/EIG investment advisory agreement. FS/EIG Advisor oversees the management of the Company’s operations and is responsible for making investment decisions with respect to the Company’s portfolio. FS/EIG Advisor is jointly operated by an affiliate of Franklin Square Holdings, L.P. (which does business as FS Investments) and EIG Asset Management, LLC, or EIG.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting PoliciesBasis of Presentation: The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP, for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. For a more complete discussion of significant accounting policies and certain other information, the Company’s interim unaudited consolidated financial statements should be read in conjunction with its audited consolidated financial statements as of and for the year ended December 31, 2022 included in the Company’s annual report on Form 10-K. Operating results for the nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023. The December 31, 2022 consolidated balance sheet and consolidated schedule of investments are derived from the Company's audited consolidated financial statements as of and for the year ended December 31, 2022. The Company is considered an investment company under GAAP and follows the accounting and reporting guidance applicable to investment companies under Accounting Standards Codification Topic 946, Financial Services—

Investment Companies. The Company has evaluated the impact of subsequent events through the date the unaudited consolidated financial statements were issued and filed with the Securities and Exchange Commission, or the SEC.

Use of Estimates: The preparation of the unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Many of the amounts have been rounded, and all amounts are in thousands, except share and per share amounts.

Capital Gains Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, the incentive fee on capital gains is determined and payable in arrears as of the end of each calendar year (or upon termination of such agreement). Such fee equals 20.0% of the Company’s “incentive fee capital gains,” which are the Company’s realized capital gains on a cumulative basis from inception, calculated as of the end of the applicable period, computed net of all realized capital losses and unrealized capital depreciation on a cumulative basis, less the aggregate amount of any previously paid incentive fees on capital gains. The Company will accrue for the incentive fee on capital gains, which, if earned, will be paid annually. The Company will accrue the incentive fee on capital gains based on net realized and unrealized gains; however, the fee payable to FS/EIG Advisor will be based on realized gains and no such fee will be payable with respect to unrealized gains unless and until such gains are actually realized. For the nine months ended September 30, 2023 and 2022, the Company did not accrue any amount of capital gains incentive fee.

Subordinated Income Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, FS/EIG Advisor may also be entitled to receive a subordinated incentive fee on income. The subordinated incentive fee on income under the FS/EIG investment advisory agreement is calculated and payable quarterly in arrears and equals 20.0% of the Company’s “pre-incentive fee net investment income” for the immediately preceding quarter subject to a hurdle rate, expressed as a rate of return on adjusted capital, equal to 1.625% per quarter, or an annualized hurdle rate of 6.5%. As a result, FS/EIG Advisor will not earn this incentive fee for any quarter until the Company’s pre-incentive fee net investment income for such quarter exceeds the hurdle rate of 1.625%. For purposes of this fee, “adjusted capital” means cumulative gross proceeds generated from sales of the Company’s common shares (including proceeds from its distribution reinvestment plan) reduced for distributions from non-liquidating dispositions of the Company’s investments paid to shareholders and amounts paid for share repurchases pursuant to the Company’s share repurchase program. Once the Company’s pre-incentive fee net investment income in any quarter exceeds the hurdle rate, FS/EIG Advisor will be entitled to a “catch-up” fee equal to the amount of the Company’s pre-incentive fee net investment income in excess of the hurdle rate, until the Company’s pre-incentive fee net investment income for such quarter equals 2.031%, or 8.125% annually, of adjusted capital. This “catch-up” feature will allow FS/EIG Advisor to recoup the fees foregone as a result of the existence of the hurdle rate. Thereafter, FS/EIG Advisor will be entitled to receive 20.0% of the Company’s pre-incentive fee net investment income. For the nine months ended September 30, 2023 and 2022, the Company did not accrue any amount of subordinated incentive fee on income.

Reclassifications: Certain amounts in the unaudited consolidated financial statements for the nine months ended September 30, 2022 may have been reclassified to conform to the classifications used to prepare the unaudited consolidated financial statements for the nine months ended September 30, 2023.

Revenue Recognition: Security transactions are accounted for on the trade date. The Company records interest income on an accrual basis to the extent that it expects to collect such amounts. The Company records dividend income on the ex-dividend date. Distributions received from limited liability company, or LLC, and limited partnership, or LP, investments are evaluated to determine if the distribution should be recorded as dividend income or a return of capital. The Company does not accrue as a receivable interest or dividends on loans and securities if it has reason to doubt its ability to collect such income. The Company’s policy is to place investments on non-accrual status when there is reasonable doubt that interest income will be collected. The Company considers many factors relevant to an investment when placing it on or removing it from non-accrual status including, but not limited to, the delinquency status of the investment, economic and business conditions, the overall financial condition of the underlying investment, the value of the underlying collateral, bankruptcy status, if any, and any other facts or circumstances relevant to the investment. If there is reasonable doubt that the Company will receive any previously accrued interest, then the accrued interest will be written-off. Payments received on non-accrual investments may be recognized as income or applied to principal depending upon the collectability of the remaining principal and interest. Non-accrual investments may be restored to accrual status when principal and interest become current and are likely to remain current based on the Company’s judgment.

Loan origination fees, original issue discount and market discount are capitalized and the Company amortizes such amounts as interest income over the respective term of the loan or security. Upon the prepayment of a loan or security, any unamortized loan origination fees and original issue discount are recorded as interest income. Structuring and other non-recurring upfront fees are recorded as fee income when earned. The Company records prepayment premiums on loans and securities as fee income when it earns such amounts. For the nine months ended September 30, 2023 and 2022, the Company recognized $591 and $0, respectively, in structuring or other upfront fee revenue.

Net Realized Gains or Realized Losses on Extinguishment of Debt: Upon the repayment of debt obligations which are deemed to be extinguishments, the difference between the principal amount due at maturity and the amount repaid on the extinguishment of debt is recognized as a gain or loss.

Derivative Instruments: The Company’s derivative instruments may include fixed price swaps and equity total return swaps. The Company recognizes all derivative instruments as assets or liabilities at fair value in its consolidated financial statements. Derivative contracts entered into by the Company are not designated as hedging instruments for accounting purposes, and as a result, the Company presents changes in fair value through net change in unrealized appreciation (depreciation) on swap contracts in the consolidated statements of operations. Realized gains and losses of the derivative instruments are included in net realized gain (loss) on swap contracts in the consolidated statements of operations.

Recent Accounting Pronouncements: In March 2020, the FASB issued Accounting Standards Update No. 2020-04, Reference Rate Reform (Topic 848), or ASU 2020-04, which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. In January 2021, the FASB issued Accounting Standards Update No. 2021-01, Reference Rate Reform (Topic 848), or ASU 2021-01, which expanded the scope of Topic 848 to include derivative instruments impacted by discounting transition. ASU 2020-04 and ASU 2021-01 are effective for all entities through December 31, 2022. The expedients and exceptions provided by the amendments do not apply to contract modifications and hedging relationships entered into or evaluated after December 31, 2022, except for hedging transactions as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. In December 2022, the FASB issued Accounting Standards Update No. 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, or ASU 2022-06, which deferred the sunset date of this guidance to December 31, 2024. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

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Share Transactions

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Share Transactions

Share Transactions

Below is a summary of transactions with respect to the Company’s common shares during the nine months ended September 30, 2023 and 2022:

	Nine Months Ended September 30,
	2023			2022
	Shares	Amount		Shares	Amount
Reinvestment of Distributions(1)	4,040,561	$	15,549	4,040,233	$	15,651
Proceeds from Share Transactions	4,040,561	$	15,549	4,040,233	$	15,651

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(1)    On September 15, 2023, the Company's second amended and restated distribution reinvestment plan terminated.

On July 19, 2023, the Company’s board of trustees, including the independent trustees, approved the termination of the Company’s second amended and restated distribution reinvestment plan with respect to distributions declared by the Company’s board of trustees on the Company’s common shares, effective as of September 15, 2023. After this date, all shareholders will receive any subsequent distributions in cash.

On February 25, 2020, the Company received exemptive relief from the SEC permitting it to offer multiple classes of common shares. While the Company has no present intention to recommence a public offering of its common shares, the Company could do so in the future.

Share Repurchase Program

In March 2020, in light of difficult market conditions and in an effort to preserve liquidity in the Company, the Company’s board of trustees determined to suspend for an indefinite period of time the Company’s share repurchase program and will reassess the Company’s ability to recommence such program in future periods.

Prior to its suspension, the Company intended to conduct quarterly tender offers pursuant to its share repurchase program. The Company's board of trustees will consider the following factors, among others, in making its determination regarding whether to cause the Company to offer to repurchase common shares and under what terms:

•    the effect of such repurchases on the Company’s qualification as a RIC (including the consequences of any necessary asset sales);

•    the liquidity of the Company's assets (including fees and costs associated with disposing of assets);

•    the Company’s investment plans and working capital requirements;

•    the relative economies of scale with respect to the Company’s size;

•    the Company’s history in repurchasing common shares or portions thereof; and

•    the condition of the securities markets.

Historically, the Company limited the number of common shares to be repurchased during any calendar year to the lesser of (i) the number of common shares the Company can repurchase with the proceeds it receives from the issuance of common shares under the Company’s distribution reinvestment plan and (ii) 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter. On May 5, 2017, the board of trustees of the Company further amended the share repurchase program. As amended, the Company limited the maximum number of common shares to be repurchased for any repurchase offer to the greater of (A) the number of common shares that the Company can repurchase with the proceeds it has received from the sale of common shares under its distribution reinvestment plan during the twelve-month period ending on the date the applicable repurchase offer expires (less the amount of proceeds used to repurchase common shares on each previous repurchase date for repurchase offers conducted during such twelve-month period) (this limitation is referred to as the twelve-month repurchase limitation) and (B) the number of common shares that the Company can repurchase with the proceeds the Company receives from the sale of common shares under its distribution reinvestment plan during the three-month period ending on the date the applicable repurchase offer expires (this limitation is referred to as the three-month repurchase limitation). In addition to this limitation, the maximum number of common shares to be repurchased for any repurchase offer has also been limited to 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter. As a result, the maximum number of common shares to be repurchased for any repurchase offer would not exceed the lesser of (i) 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter, and (ii) whichever is greater of the twelve-month repurchase limitation described in clause (A) above and the three-month repurchase limitation described in clause (B) above.

Historically, pursuant to the Company's share repurchase program, the Company offered to repurchase common shares at a price equal to the price at which common shares were issued pursuant to the Company’s distribution reinvestment plan on the distribution date coinciding with the applicable share repurchase date. The price at which common shares were issued under the Company’s distribution reinvestment plan was determined by the Company’s board of trustees or a committee thereof, in its sole discretion, and was (i) not less than the net asset value per common share as determined in good faith by the Company’s board of trustees or a committee thereof, in its sole discretion, immediately prior to the payment date of the distribution and (ii) not more than 2.5% greater than the net asset value per common share as of such date. The Company’s board of trustees may amend, suspend or terminate the share repurchase program at any time, upon 30 days’ notice. The Company did not repurchase any shares pursuant to its share repurchase program during the nine months ended September 30, 2023 and 2022. The Company's distribution reinvestment plan was terminated effective September 15, 2023.

In order to minimize the expense of supporting small accounts and provide additional liquidity to shareholders of the Company holding small accounts after completion of a regular quarterly share repurchase offer, the Company reserves the right to repurchase the shares of and liquidate any investor’s account if the balance of such account is less than the Company’s $5 minimum initial investment, unless the account balance has fallen below the minimum solely as a result of a decline in the Company’s net asset value per share. The Company will provide or will cause to be provided 30 days’ prior written notice to potentially affected investors, which notice may be included in regular quarterly repurchase offer materials, of any such repurchase. Historically, any such repurchases were made at the Company’s most recent price at which the Company’s shares were issued pursuant to its distribution reinvestment plan. There were no de minimis account liquidations during the nine months ended September 30, 2023 and 2022.

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Related Party Transactions

9 Months Ended

Sep. 30, 2023

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

Compensation of the Investment Adviser

Pursuant to the FS/EIG investment advisory agreement, FS/EIG Advisor is entitled to an annual base management fee based on the average weekly value of the Company’s gross assets (gross assets equals total assets as set forth on the Company’s consolidated balance sheets) during the most recently completed calendar quarter and an incentive fee based on the Company’s performance. The base management fee is payable quarterly in arrears, and is calculated at an annual rate of 1.75% of the average weekly value of the Company’s gross assets. See Note 2 for a discussion of the capital gains and subordinated income incentive fees that FS/EIG Advisor may be entitled to under the FS/EIG investment advisory agreement.

FS/EIG Advisor may receive structuring or other upfront fees from portfolio companies in which FS/EIG Advisor has caused the Company to invest. FS/EIG Advisor has agreed to offset the amount of any structuring, upfront or certain other fees received by FS/EIG Advisor or its members against the management fees payable by the Company under the FS/EIG investment advisory agreement. During the nine months ended September 30, 2023 and 2022, $337 and $2,606, respectively, of structuring, upfront or certain other fees received by FS/EIG Advisor or its members were offset against management fees.

Pursuant to the FS/EIG investment advisory agreement, FS/EIG Advisor oversees the Company’s day-to-day operations, including the provision of general ledger accounting, fund accounting, legal services, investor relations, certain government and regulatory affairs activities and other administrative services. FS/EIG Advisor also performs, or oversees the performance of, the Company’s corporate operations and required administrative services, which includes being responsible for the financial records that the Company is required to maintain and preparing reports for the Company’s shareholders and reports filed with the SEC.

The Company reimburses FS/EIG Advisor for expenses necessary to perform services related to the Company’s administration and operations, including FS/EIG Advisor’s allocable portion of the compensation and/or related expenses of certain personnel of FS Investments and EIG providing administrative services to the Company on behalf of FS/EIG Advisor, and for transactional expenses for prospective investments, such as fees and expenses associated with performing due diligence reviews of investments that do not close, often referred to as “broken deal” costs. The Company reimburses FS/EIG Advisor no less than quarterly for expenses necessary to perform services related to the Company’s administration and operations. The amount of this reimbursement is set at the lesser of (1) FS/EIG Advisor’s actual costs incurred in providing such services and (2) the amount that the Company estimates it would be required to pay alternative service providers for comparable services in the same geographic location. FS/EIG Advisor allocates the cost of such services to the Company based on factors such as time allocations and other reasonable metrics. The Company’s board of trustees reviews the methodology employed in determining how the expenses are allocated to the Company and assesses the reasonableness of such reimbursements for expenses allocated to the Company based on the breadth, depth and quality of such services as compared to the estimated cost to the Company of obtaining similar services from third-party providers known to be available. In addition, the Company’s board of trustees considers whether any single third-party service provider would be capable of providing all such services at comparable cost and quality. Finally, the Company’s board of trustees, among other things, compares the total amount paid to FS/EIG Advisor for such services as a percentage of the Company’s net assets to the same ratio as reported by other comparable BDCs. The Company does not reimburse FS/EIG Advisor for any services for which it receives a separate fee, or for rent, depreciation, utilities, capital equipment or other administrative items allocated to a controlling person of FS/EIG Advisor.

The following table describes the fees and expenses accrued under the FS/EIG investment advisory agreement during the three and nine months ended September 30, 2023 and 2022:

			Three Months Ended September 30,				Nine Months Ended September 30,
Related Party	Source Agreement	Description	2023		2022		2023		2022
FS/EIG Advisor	FS/EIG investment advisory agreement	Base Management Fee(1)	$	7,715	$	11,142	$	26,620	$	30,755
FS/EIG Advisor	FS/EIG investment advisory agreement	Administrative Services Expenses(2)	$	1,887	$	1,695	$	4,566	$	4,605

_________________________

(1)    During the nine months ended September 30, 2023 and 2022, $30,090 and $30,079, respectively, in base management fees were paid to FS/EIG Advisor. The base management fee amount shown in the table above is shown net of $63 and $208 in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees for the three months ended September 30, 2023 and 2022, respectively, and $337 and $2,606 in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees for the nine months ended September 30, 2023 and 2022, respectively. As of September 30, 2023, $7,715 in base management fees were payable to FS/EIG Advisor.

(2)    During the nine months ended September 30, 2023 and 2022, $2,386 and $1,999, respectively, of the accrued administrative services expenses related to the allocation of costs of administrative personnel for services rendered to the Company by FS/EIG Advisor and the remainder related to other reimbursable expenses. The Company paid $4,017 and $3,284 in administrative services expenses to FS/EIG Advisor, or its affiliates, during the nine months ended September 30, 2023 and 2022, respectively.

Potential Conflicts of Interest

The members of the senior management and investment teams of FS/EIG Advisor serve or may serve as officers, directors or principals of entities that operate in the same or a related line of business as the Company does, or of investment vehicles managed by the same personnel. The officers, managers and other personnel of FS/EIG Advisor may serve in similar or other capacities for the investment advisers to future investment vehicles affiliated with FS Investments or EIG. In serving in these multiple and other capacities, they may have obligations to other clients or investors in those entities, the fulfillment of which may not be in the Company’s best interests or in the best interest of the Company’s shareholders. The Company’s investment objectives may overlap with the investment objectives of such investment funds, accounts or other investment vehicles. For additional information regarding potential conflicts of interest, see the Company’s annual report on Form 10-K for the year ended December 31, 2022.

Exemptive Relief

As a BDC, the Company is subject to certain regulatory restrictions in making its investments. For example, BDCs generally are not permitted to co-invest with certain affiliated entities in transactions originated by the BDC or its affiliates in the absence of an exemptive order from the SEC. However, BDCs are permitted to, and may, simultaneously co-invest in transactions where price is the only negotiated term. In an order dated June 4, 2013, or the Order, the SEC granted exemptive relief permitting the Company, subject to the satisfaction of certain conditions, to co-invest in certain privately negotiated investment transactions with certain affiliates of its former investment adviser, including FS KKR Capital Corp., or collectively the Company’s co-investment affiliates. Effective April 9, 2018, or the JV Effective Date, and in connection with the transition of advisory services to a joint advisory relationship with EIG, the Company’s board of trustees authorized and directed that the Company (i) withdraw from the Order, except with respect to any transaction in which the Company participated in reliance on the Order prior to the JV Effective Date, and (ii) rely on an exemptive relief order dated April 10, 2018, granted to EIG and its affiliates which permits the Company to participate in co-investment transactions with certain other EIG advised funds, or the EIG Order.

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Distributions

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Distributions

Distributions

The following table reflects the cash distributions per share that the Company declared on its common shares during the nine months ended September 30, 2023 and 2022:

	Distribution
For the Three Months Ended	Per Share		Amount
Fiscal 2022
March 31, 2022	$	0.03	$	13,426
June 30, 2022	0.03		13,465
September 30, 2022	0.03		13,504
Total	$	0.09	$	40,395
Fiscal 2023
March 31, 2023	$	0.03	$	13,584
June 30, 2023	0.03		13,624
September 30, 2023	—		—
Total	$	0.06	$	27,208

The Company expects to provide enhanced quarterly distributions to shareholders. On October 18, 2023, the Company’s board of trustees declared the initial enhanced cash distribution of $0.0683 per share for the third quarter of 2023, which represents an annualized distribution rate of approximately 7.5% based on the Company’s estimated net asset value as of September 30, 2023. The enhanced distributions are expected to be paid quarterly and increase in subsequent years until the achievement of a long-term liquidity event, subject to a maximum cap of 15% of the Company’s then-current estimated net asset value beyond 2026. The Company expects a portion of the distributions may represent a return of investor capital, helping to accelerate liquidity for shareholders in the near-term. There can be no assurance that the Company will be able to pay distributions in the future. The timing and amount of any future distributions to shareholders are subject to applicable legal restrictions and the sole discretion of the Company’s board of trustees.

Historically, the Company had an “opt in” distribution reinvestment plan for its shareholders. As a result, if the Company made a cash distribution, its shareholders would receive distributions in cash unless they specifically “opted in” to the distribution reinvestment plan so as to have their cash distributions reinvested in additional common shares. However, certain state authorities or regulators may have imposed restrictions from time to time that may have prevented or limited a shareholder's ability to participate in the distribution reinvestment plan. The Company's distribution reinvestment plan was terminated effective as of September 15, 2023.

Under the prior distribution reinvestment plan, cash distributions to participating shareholders would be reinvested in additional common shares at a purchase price determined by the Company’s board of trustees, or a committee thereof, in its sole discretion, that was (i) not less than the net asset value per common share as determined in good faith by the Company’s board of trustees or a committee thereof, in its sole discretion, immediately prior to the payment of the distribution and (ii) not more than 2.5% greater than the net asset value per common share as of such date. Any distributions reinvested under the plan would remain taxable to a U.S. shareholder.

The Company may fund its cash distributions to shareholders from any sources of funds legally available to it, including proceeds from the sale of the Company’s common shares, borrowings, net investment income from operations, capital gains proceeds from the sale of assets and non-capital gains proceeds from the sale of assets, dividends or other distributions paid to the Company on account of preferred and common equity investments in portfolio companies. The Company has not established limits on the amount of funds it may use from available sources to make distributions. The Company's distribution proceeds have exceeded and in the future may exceed its earnings. Therefore, portions of the distributions that the Company has made represented, and may make in the future may represent, a return of capital to shareholders, which lowers their tax basis in their common shares. A return of capital generally is a return of a shareholder’s investment rather than a return of earnings or gains derived from the Company’s investment activities. Each year a statement on Form 1099-DIV identifying the sources of the distributions (i.e., paid from ordinary income, paid from net capital gains on the sale of securities, and/or a return of capital, which is a nontaxable distribution) will be mailed to the Company’s shareholders. There can be no assurance that the Company will be able to pay distributions at a specific rate or at all.

The following table reflects the sources of the cash distributions on a tax basis that the Company declared on its common shares during the nine months ended September 30, 2023 and 2022:

	Nine Months Ended September 30,
	2023				2022
Source of Distribution	Distribution Amount		Percentage		Distribution Amount		Percentage
Net investment income(1)	$	27,208	100	%	$	40,395	100	%
Short-term capital gains proceeds from the sale of assets	—		—		—		—
Long-term capital gains proceeds from the sale of assets	—		—		—		—
Total	$	27,208	100	%	$	40,395	100	%

_________________________

(1)    During the nine months ended September 30, 2023 and 2022, 83.8% and 80.9%, respectively, of the Company's gross investment income was attributable to cash income earned, 12.3% and 14.7%, respectively, was attributable to paid-in-kind, or PIK, interest and 3.9% and 4.4%, respectively, was attributable to non-cash accretion of discount.

In the past, the Company has experienced restructurings and defaults and may experience such events again in the future. Any restructuring or default may have an impact on the level of income received by the Company.

The determination of the tax attributes of the Company’s distributions is made annually as of the end of the Company’s fiscal year based upon the Company’s taxable income for the full year and distributions paid for the full year. Therefore, a determination made on a quarterly basis may not be representative of the actual tax attributes of the Company's distributions for a full year. The actual tax characteristics of distributions to shareholders are reported to shareholders annually on Form 1099-DIV.

Net capital losses may be carried forward indefinitely, and their character is retained as short-term or long-term. As of September 30, 2023, the Company had short-term and long-term capital loss carryforwards available to offset future realized capital gains of $73,519 and $1,451,516, respectively.

As of September 30, 2023 and December 31, 2022, for federal income tax purposes, the gross unrealized appreciation on the Company’s investments, swap contracts and unrealized gain on foreign currency was $203,031 and $334,635, respectively, and the gross unrealized depreciation on the Company’s investments, swap contracts and unrealized loss on foreign currency was $262,695 and $512,206, respectively.

The aggregate cost of the Company’s investments for federal income tax purposes totaled $1,552,114 and $2,223,943 as of September 30, 2023 and December 31, 2022, respectively. The aggregate net unrealized appreciation (depreciation) on a tax basis was $(59,348) and $(176,828) as of September 30, 2023 and December 31, 2022, respectively.

As of September 30, 2023 and December 31, 2022, the Company had deferred tax assets of $151,115 and $145,383, respectively, resulting from interest expense disallowance, net operating losses and capital losses of the Company's wholly-owned taxable subsidiaries. As of September 30, 2023 and December 31, 2022, the Company had deferred tax liabilities of $3,129 and $28,753, respectively, resulting from unrealized appreciation on investments held by the Company's wholly-owned taxable subsidiaries. As of September 30, 2023 and December 31, 2022, certain wholly-owned taxable subsidiaries anticipated that they would be unable to fully utilize their deferred tax assets, therefore the deferred tax assets were offset by valuation allowances of $147,986 and $116,630, respectively. For the nine months ended September 30, 2023, the Company did not record a provision for taxes related to its wholly-owned taxable subsidiaries. For the year ended December 31, 2022, the Company recorded a provision for taxes related to its wholly-owned taxable subsidiaries of $1,207 related to current taxes.

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Financial Instruments

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Financial Instruments

The Company may trade in financial instruments with off-balance sheet risk in the normal course of its investing activities. During the nine months ended September 30, 2023 and 2022, the Company utilized commodity fixed price swaps to economically hedge certain risks against natural gas and crude oil price exposure related to certain investments in the Company's portfolio. On September 20, 2023, the Company entered into an equity total return swap to obtain exposure to a security without owning such security. While the use of these derivative instruments limits the downside risk of adverse price movements, their use also limits future revenues from upward price movements.

Fixed Price Swaps

A fixed price swap is a contract between two parties in which settlements are made at a specified time based on the difference between the fixed price specified in the contract and the referenced settlement price. When the referenced settlement price is less than the price specified in the contract, the Company receives an amount from the counterparty based on the price difference multiplied by the volume. Similarly, when the referenced settlement price exceeds the price specified in the contract, the Company pays the counterparty an amount based on the price difference multiplied by the volume.

The Company's fixed price swaps are settled monthly and the settlement prices contained in these fixed price swaps are based on commodity exchanges; the NYMEX Henry Hub for natural gas and the ICE Brent for oil. Gas volumes are measured in one million British thermal units, or MMBtus, and oil volumes are measured in barrels, or Bbls. The changes in the value of the fixed price swaps are recorded as unrealized appreciation or depreciation on swap contracts in the consolidated balance sheets. The Company's fixed price swaps settle monthly and the changes in the value of the fixed price swaps are recorded as realized gains or losses in the consolidated statements of operations. The primary underlying risk exposure through the use of fixed price swaps is commodity price risk of the underlying commodity, such as natural gas and crude oil.

Total Return Swaps

A total return swap is a contract in which there is an exchange of cash flows whereby one party agrees to make periodic payments based on the total return (distributions plus capital gains/losses) of an underlying instrument in exchange for fixed or floating rate interest payments. If the total return of the instrument or index underlying the transaction exceeds or falls short of the offsetting fixed or floating interest rate obligation, the Company receives payment from or makes a payment to the counterparty. Total return swaps are entered into to obtain exposure to a security or market without owning such security or investing directly in such market or to exchange the risk/return of one market with another market.

On September 20, 2023, the Company entered into an equity total return swap, or equity TRS, with Nomura Global Financial Products Inc., or Nomura. Under the equity TRS, the Company obtains the economic benefit of owning shares of FS Credit Opportunities Corp., or FSCO, an investment company registered under the 1940 Act, without actually owning them, and Nomura will receive an interest-type payment in return. The investment adviser to FSCO is wholly-owned by Franklin Square Holdings, L.P., which is also the majority owner of FS/EIG Advisor.

The Company's equity TRS is marked-to-market daily and the change in market value is recorded as unrealized appreciation or depreciation on swap contracts in the consolidated balance sheets. Pursuant to its terms, the Company's equity TRS settles monthly and a realized gain or loss is recorded in the consolidated statements of operations equal to the difference between the value of the shares underlying the equity TRS at the time the swap was entered into or the previous settlement date and the value as of the current settlement date. Any dividends received by Nomura as holder of the FSCO shares are paid to the Company. The equity TRS has a term of three years, but it could be terminated earlier in whole or in part following the occurrence of certain prescribed events agreed to between Nomura and the Company. The primary underlying risk exposure through the use of equity total return swaps is equity market risk.

During the nine months ended September 30, 2023, the average monthly notional volume of commodity fixed price swaps—crude oil and commodity fixed price swaps—natural gas outstanding were 109,764 Bbls and 198,215 MMBtus, respectively. The average notional amount of the equity total return swap from the initial trade date of September 25, 2023 through September 30, 2023 was $1,721.

The following table presents the fair value of open swap contracts (which are not considered to be hedging instruments for accounting purposes) as of September 30, 2023 and December 31, 2022:

	September 30, 2023 (Unaudited)				December 31, 2022
Instrument	Asset(1)		Liability(2)		Asset(1)		Liability(2)
Commodity Fixed Price Swaps—Crude Oil	$	—	$	(404)	$	—	$	(572)
Commodity Fixed Price Swaps—Natural Gas	36		—		—		(126)
Equity Total Return Swaps	70		—		—		—
Total	$	106	$	(404)	$	—	$	(698)

______________

(1)    Reflected on the Company's consolidated balance sheets as: Unrealized appreciation on swap contracts.

(2)    Reflected on the Company's consolidated balance sheets as: Unrealized depreciation on swap contracts.

The effect of swap contracts (which are not considered to be hedging instruments for accounting purposes) on the Company's statements of operations for the nine months ended September 30, 2023 and 2022 was as follows:

	Net Realized Gains (Losses)(1)				Net Change in Unrealized Appreciation (Depreciation)(2)
	Nine Months Ended September 30,				Nine Months Ended September 30,
Instrument	2023		2022		2023		2022
Commodity Fixed Price Swaps—Crude Oil	$	(259)	$	(1,968)	$	168	$	672
Commodity Fixed Price Swaps—Natural Gas	348		(652)		162		(678)
Equity Total Return Swaps	(1)		—		70		—
Total	$	88	$	(2,620)	$	400	$	(6)

______________

(1)    Reflected on the Company's consolidated statements of operations as: Net realized gain (loss) on swap contracts.

(2)    Reflected on the Company's consolidated statements of operations as: Net change in unrealized appreciation (depreciation) on swap contracts.

Offsetting of Derivative Instruments

The Company has derivative instruments that are subject to master netting agreements. These agreements include provisions to offset positions with the same counterparty in the event of default by one of the parties. The Company’s unrealized appreciation and depreciation on derivative instruments are reported as gross assets and liabilities, respectively, in the consolidated balance sheets.

The following tables present the Company’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement and net of any collateral received or pledged by the Company for such assets and liabilities as of September 30, 2023 and December 31, 2022:

	As of September 30, 2023 (Unaudited)
Counterparty	Derivative Assets		Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)		Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	$	36	$	(404)	$	(368)	—	—		$	(368)
Nomura Global Financial Products Inc.	$	70	—		$	70	—	$	(70)	—

	As of December 31, 2022
Counterparty	Derivative Assets	Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)	Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	—	$	(698)	$	(698)	—	—	$	(698)

______________

(1)    In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization.

(2)    Net amount of derivative assets and liabilities represents the net amount due from the counterparty to the Company and the net amount due from the Company to the counterparty, respectively, in the event of default.

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Investment Portfolio

9 Months Ended

Sep. 30, 2023

Schedule of Investments [Abstract]

Investment Portfolio

Investment Portfolio

The following table summarizes the composition of the Company’s investment portfolio at cost and fair value as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)						December 31, 2022
	Amortized Cost(1)		Fair Value		Percentage of Portfolio		Amortized Cost(1)		Fair Value		Percentage of Portfolio
Senior Secured Loans—First Lien	$	675,016	$	631,307	42	%	$	702,842	$	706,646	35	%
Senior Secured Loans—Second Lien	70,267		69,599		5	%	143,153		143,270		7	%
Senior Secured Bonds	33,385		32,681		2	%	10,064		10,074		0	%
Unsecured Debt	108,367		109,302		7	%	253,675		241,418		12	%
Preferred Equity	252,450		259,205		18	%	425,182		400,414		20	%
Sustainable Infrastructure Investments, LLC	54,514		49,192		3	%	54,514		51,098		2	%
Equity/Other	259,083		341,480		23	%	333,510		494,195		24	%
Total	$	1,453,082	$	1,492,766	100	%	$	1,922,940	$	2,047,115	100	%

______________

(1)    Amortized cost represents the original cost adjusted for the amortization of premiums and/or accretion of discounts, as applicable, on investments.

In general, under the 1940 Act, the Company would be presumed to “control” a portfolio company if it owned more than 25% of its voting securities or it had the power to exercise control over the management or policies of a portfolio company, and would be an “affiliated person” of a portfolio company if it owned 5% or more of its voting securities.

As of September 30, 2023, the Company held investments in four portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control.” As of September 30, 2023, the Company held investments in three portfolio companies of which it is deemed to “control.” For additional information with respect to such portfolio companies, see footnotes (s) and (t) to the unaudited consolidated schedule of investments as of September 30, 2023 in this quarterly report on Form 10-Q.

As of December 31, 2022, the Company held investments in six portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control.” As of December 31, 2022, the Company held investments in three portfolio

companies of which it is deemed to “control.” For additional information with respect to such portfolio companies, see footnotes (t) and (u) to the consolidated schedule of investments as of December 31, 2022 in this quarterly report on Form 10-Q.

The Company’s investment portfolio may contain loans or bonds that are in the form of lines of credit or revolving credit facilities, or other investments, pursuant to which the Company may be required to provide funding when requested by portfolio companies in accordance with the terms of the underlying agreements. As of September 30, 2023, the Company had three senior secured loan investments with aggregate unfunded commitments of $6,741 and unfunded commitments of $7,625 in U.S. dollars and $858 in Canadian dollars to contribute capital to Sustainable Infrastructure Investments, LLC. As of December 31, 2022, the Company had six senior secured loan investments with aggregate unfunded commitments of $25,891 and unfunded commitments of $7,625 in U.S dollars and $858 in Canadian dollars to contribute capital to Sustainable Infrastructure Investments, LLC. The Company maintains sufficient cash on hand, available borrowings and/or liquid securities to fund such unfunded commitments should the need arise.

The table below describes investments by industry classification and enumerates the percentage, by fair value, of the total portfolio assets in such industries as of September 30, 2023 and December 31, 2022:

	September 30, 2023 (Unaudited)				December 31, 2022
Industry Classification	Fair Value		Percentage of Portfolio		Fair Value		Percentage of Portfolio
Energy—Upstream	$	533,790	36	%	$	854,974	42	%
Energy—Midstream	423,991		28	%	646,488		32	%
Energy—Power	194,940		13	%	386,007		19	%
Consumer Services	51,022		3	%	—		—
Energy—Service & Equipment(1)	49,724		3	%	96,040		5	%
Capital Goods	29,821		2	%	—		—
Consumer Discretionary Distribution & Retail	27,975		2	%	—		—
Commercial & Professional Services(1)	22,062		2	%	12,508		0	%
Household & Personal Products	20,297		1	%	—		—
Financial Services	19,939		1	%	—		—
Pharmaceuticals, Biotechnology & Life Sciences	19,400		1	%	—		—
Insurance	11,275		1	%	—		—
Transportation	9,851		1	%	—		—
Automobiles & Components	9,849		1	%	—		—
Consumer Staples Distribution & Retail	9,844		1	%	—		—
Health Care Equipment & Services	9,794		1	%	—		—
Sustainable Infrastructure Investments, LLC(2)	49,192		3	%	51,098		2	%
Total	$	1,492,766	100	%	$	2,047,115	100	%

_____________________

(1)    FS/EIG Advisor monitors the industry classification of the Company’s investments and may from time to time reclassify such investments if it determines such reclassification is appropriate. During the nine months ended September 30, 2023, two investments had their industry re-classified from Energy—Industrials to Commercial & Professional Services, and one investment had its industry re-classified from Energy—Service & Equipment to Commercial & Professional Services.

(2)    Sustainable Infrastructure Investments, LLC is generally comprised of midstream and renewables assets in the Energy sector.

Sustainable Infrastructure Investments, LLC

Sustainable Infrastructure Investments, LLC, or SIIJV, is a joint venture between the Company and Imperial Sustainable Infrastructure Investments, LLC, or Imperial, a subsidiary of Imperial Capital Asset Management, LLC, or ICAM. The joint venture is governed pursuant to the terms of an amended and restated limited liability company agreement of SIIJV, dated as of January 2, 2020, between the Company and Imperial, or the SIIJV Agreement. The SIIJV Agreement requires the Company and Imperial to provide capital to SIIJV of up to $67,629 in U.S. dollars and $5,430 in Canadian dollars in the aggregate where the Company and Imperial would provide 87.5% and 12.5%, respectively, of the committed capital. Pursuant to the terms of the SIIJV Agreement, the Company and Imperial each have 50% voting control of SIIJV and are required to agree on all investment decisions as well as all other significant actions for SIIJV. SIIJV invests in senior secured loans (both first lien and second lien) to middle market companies,

broadly syndicated loans and other midstream, renewables and power assets. As administrative agent of SIIJV, the Company performs certain day-to-day management responsibilities on behalf of SIIJV and is entitled to a fee in the annual amount of 0.25% of SIIJV’s net assets under administration, calculated and payable quarterly in arrears. As of September 30, 2023, the Company and Imperial funded approximately $62,300 to SIIJV, of which $54,514 was from the Company. The Company does not consolidate SIIJV in its consolidated financial statements.

On January 2, 2020, Seine Funding, LLC, or Seine Funding, a wholly-owned subsidiary of SIIJV, entered into a credit facility, as amended, or the Seine Funding Facility, with certain financial institutions as lender, agent, collateral agent, collateral administrator, and collateral custodian, and SIIJV, as collateral manager. The Seine Funding Facility provides for borrowings in U.S. dollars and certain agreed upon foreign currencies in an aggregate principal amount of up to $634,103 on a committed basis, which may be increased under certain circumstances at the request of Seine Funding and with the consent of the lender and agent. The end of the reinvestment period for the Seine Funding Facility was on December 31, 2020. The maturity date for the Seine Funding Facility is the earlier of (i) the latest maturity date among the assets securing the facility and (ii) the first date, after the end of the reinvestment period, on which all assets securing the facility are paid in full. Under the Seine Funding Facility, borrowings bear interest at the rate of three-month LIBOR (or the relevant reference rate for any foreign currency borrowings) (subject to a 0% floor) plus 1.20% per annum. Borrowings under the Seine Funding Facility are secured by a first priority security interest in substantially all of the assets of Seine Funding. As of September 30, 2023, total outstanding borrowings under the Seine Funding Facility were $195,734.

Below is a summary of SIIJV's portfolio, followed by a listing of the individual loans in SIIJV's portfolio as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)			December 31, 2022
Total investments(1)	$	192,881		$	274,088
Weighted average current interest rate on debt investments(2)	7.35		%	6.96		%
Number of portfolio assets in SIIJV	8			9
Largest investment in a single portfolio company(1)	$	57,784		$	73,707

_____________________

(1)    At cost.

(2)    Computed as the (a) annual stated interest rate on accruing debt, divided by (b) total debt at par amount.

Sustainable Infrastructure Investments, LLC Portfolio

As of September 30, 2023

(Unaudited)

Portfolio Company(a)(f)	Footnotes	Energy Industry	Rate(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Lien—100.0%
Blue Heron Intermediate Holdco I, LLC		Midstream	S+188	4/22/24	$	30,958	$	30,958	$	31,004
Cedar Creek II LLC		Renewables	S+188	11/18/23	8,160		8,160		8,166
Copper Mountain Solar 3, LLC		Renewables	S+188	5/31/25	17,105		17,105		17,209
FLNG Liquefaction 2, LLC		Midstream	S+150	12/31/26	26,972		26,972		26,835
Meikle Wind Energy, LP	(e)	Renewables	C+150	5/12/24	C$	15,431	11,872		11,405
NES Hercules Class B Member, LLC		Renewables	S+163	1/31/28	$	24,176	24,176		24,596
ST EIP Holdco LLC		Midstream	S+250	11/5/24	57,784		57,784		57,577
Top of the World Wind Energy LLC		Renewables	S+213	12/1/28	15,854		15,854		16,137
Total Senior Secured Loans—First Lien							192,881		192,929
TOTAL INVESTMENTS—100.0%							$	192,881	$	192,929

Sustainable Infrastructure Investments, LLC Portfolio

As of December 31, 2022

Portfolio Company(a)(f)	Footnotes	Industry	Rate(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Lien—100.0%
Alianca Transportadora de Gas Participacoes S.A.		Midstream	L+260	5/23/27	$	73,707	$	73,707	$	74,601
Blue Heron Intermediate Holdco I, LLC		Midstream	L+188	4/22/24	31,832		31,832		31,885
Cedar Creek II LLC		Renewables	L+188	11/18/23	8,710		8,710		8,722
Copper Mountain Solar 3, LLC		Renewables	L+175	5/31/25	17,804		17,804		17,879
FLNG Liquefaction 2, LLC		Midstream	L+150	12/31/26	28,170		28,170		27,990
Meikle Wind Energy, LP	(e)	Renewables	C+150	5/12/24	C$	16,030	12,332		11,873
NES Hercules Class B Member, LLC		Renewables	L+150	1/31/28	$	24,487	24,487		24,954
ST EIP Holdco LLC		Midstream	L+250	11/5/24	58,673		58,673		58,288
Top of the World Wind Energy LLC		Renewables	L+188	12/1/28	18,373		18,373		18,866
Total Senior Secured Loans—First Lien							274,088		275,058
TOTAL INVESTMENTS—100.0%							$	274,088	$	275,058

_____________________

Percentages are shown as a percentage of total investments.

(a)    Security may be an obligation of one or more entities affiliated with the named company.

(b)    Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023 and December 31, 2022, the three-month LIBOR, or L, was 5.66% and 4.77%, respectively, the Canadian Dollar Offered Rate, or C, was 5.51% and 4.94%, respectively, and the SOFR, or S, was 5.40% and 4.59%, respectively.

(c)    Denominated in U.S. dollars unless otherwise noted.

(d)    Security is classified as Level 3 and fair value is determined in accordance with the Company’s valuation process.

(e)    Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of September 30, 2023 and December 31, 2022.

(f)    Security or portion thereof is held within Seine Funding and is pledged as collateral supporting the amounts outstanding under the Seine Funding Facility.

Below is selected balance sheet information for SIIJV as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)		December 31, 2022
Selected Balance Sheet Information
Total investments, at fair value	$	192,929	$	275,058
Cash and other assets	78,241		10,380
Total assets	$	271,170	$	285,438
Debt	$	195,734	$	213,583
Other liabilities	3,159		3,358
Total liabilities	198,893		216,941
Member's equity	$	72,277	$	68,497

Below is selected statement of operations information for SIIJV for the three and nine months ended September 30, 2023 and 2022:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Selected Statement of Operations Information
Total investment income	$	5,272	$	3,313	$	15,083	$	7,386
Expenses
Interest expense	3,410		1,201		9,870		3,352
Administrative services	46		42		134		123
Custodian and accounting fees	58		23		161		127
Professional services	70		25		170		76
Other	11		44		31		44
Total expenses	3,595		1,335		10,366		3,722
Net investment income	1,677		1,978		4,717		3,664
Net realized and unrealized gain (loss)	(2,273)		836		(937)		(1,180)
Net increase (decrease) in net assets resulting from operations	$	(596)	$	2,814	$	3,780	$	2,484

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Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair Value of Financial Instruments

Under existing accounting guidance, fair value is defined as the price that the Company would receive upon selling an investment or pay to transfer a liability in an orderly transaction to a market participant in the principal or most advantageous market for the investment. This accounting guidance emphasizes valuation techniques that maximize the use of observable market inputs and minimize the use of unobservable inputs. Inputs refer broadly to the assumptions that market participants would use in pricing an asset or liability, including assumptions about risk. Inputs may be observable or unobservable. Observable inputs are inputs that reflect the assumptions market participants would use in pricing an asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the assumptions market participants would use in pricing an asset or liability developed based on the best information available in the circumstances. The Company classifies the inputs used to measure these fair values into the following hierarchy as defined by current accounting guidance:

Level 1: Inputs that are quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2: Inputs that are quoted prices for similar assets or liabilities in active markets.

Level 3: Inputs that are unobservable for an asset or liability.

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

As of September 30, 2023 and December 31, 2022, the Company’s investments were categorized as follows in the fair value hierarchy:

Valuation Inputs	September 30, 2023  (Unaudited)		December 31, 2022
Level 1—Price quotations in active markets	$	2,023	$	2,465
Level 2—Significant other observable inputs	313,384		450,445
Level 3—Significant unobservable inputs	1,177,359		1,594,205
Total	$	1,492,766	$	2,047,115

As of September 30, 2023 and December 31, 2022, the Company’s swap contracts were categorized as follows in the fair value hierarchy:

	September 30, 2023  (Unaudited)				December 31, 2022
Valuation Inputs	Assets		Liabilities		Assets		Liabilities
Level 1—Price quotations in active markets	$	—	$	—	$	—	$	—
Level 2—Significant other observable inputs	106		404		—		698
Level 3—Significant unobservable inputs	—		—		—		—
Total	$	106	$	404	$	—	$	698

The Company’s board of trustees is responsible for overseeing the valuation of the Company’s portfolio investments at fair value as determined in good faith pursuant to FS/EIG Advisor’s valuation policy. The Company’s board of trustees has designated FS/EIG Advisor with day-to-day responsibility for implementing the portfolio valuation process set forth in FS/EIG Advisor’s valuation policy.

The Company’s investments consist primarily of investments that were acquired directly from the issuer. Debt investments, for which broker quotes or pricing information from third-party pricing services are not generally available, are valued by FS/EIG Advisor with the assistance of independent valuation firms, which determine a valuation range of fair value for such investments by considering, among other factors, the borrower’s ability to adequately service its debt, prevailing interest rates for like investments, call features, anticipated prepayments and other relevant terms of the investments. Except as described below, the Company’s investment in SIIJV and all of the Company’s preferred equity and equity/other investments are also valued by independent valuation firms, which determine the fair value of such investments by considering, among other factors, contractual rights ascribed to such investments, as well as various income scenarios and multiples of earnings before interest, taxes, depreciation and amortization, or EBITDA, cash flows, net income, revenues or, in limited instances, book value, PV-10 multiples or liquidation value. An investment that is newly issued and purchased near the date of the financial statements is valued at cost if FS/EIG Advisor determines that the cost of such investment is the best indication of its fair value. Such investments described above are typically classified as Level 3 within the fair value hierarchy. Investments that are traded on an active public market are valued at their closing price as of the date of the financial statements and are classified as Level 1 within the fair value hierarchy. Except as described above, FS/EIG Advisor typically values the Company’s other investments by using the midpoint of the prevailing bid and ask prices from dealers on the date of the relevant period end, which are provided by an independent third-party pricing service and screened for validity by such service and are typically classified as Level 2 within the fair value hierarchy. In determining the fair values of fixed price swaps, FS/EIG Advisor utilizes an industry-standard pricing model that considers various inputs including quoted forward prices for commodities, time value and current market and contractual prices for the underlying instruments. The fair value of the equity total return swap is determined daily based on the market price of the underlying asset. These assumptions are observable in the marketplace or can be corroborated by active markets or broker quotes and are typically classified as Level 2 within the fair value hierarchy.

FS/EIG Advisor periodically benchmarks the bid and ask prices it receives from the third-party pricing service and/or dealers and independent valuation firms, as applicable, against the actual prices at which the Company purchases and sells its investments. Based on the results of the benchmark analysis and the experience of the Company’s management in purchasing and selling these investments, FS/EIG Advisor believes that these prices are reliable indicators of fair value. FS/EIG Advisor reviewed the valuation determinations made with respect to these investments in a manner consistent with FS/EIG Advisor’s valuation policy.

The following is a reconciliation for the nine months ended September 30, 2023 and 2022 of investments for which significant unobservable inputs (Level 3) were used in determining fair value:

	For the Nine Months Ended September 30, 2023
	Senior Secured Loans—First Lien		Senior Secured Loans—Second Lien		Senior Secured Bonds		Unsecured Debt		Preferred Equity		Sustainable Infrastructure Investments, LLC		Equity/Other		Total
Fair value at beginning of period	$	443,245	$	143,270	$	10,074	$	54,374	$	400,414	$	51,098	$	491,730	$	1,594,205
Accretion of discount (amortization of premium)	1,369		710		38		105		1,230		—		—		3,452
Net realized gain (loss)	(2,864)		(52)		4		8		(11,847)		—		(34,851)		(49,602)
Net change in unrealized appreciation (depreciation)	(47,570)		(785)		(229)		416		31,523		(1,906)		(78,656)		(97,207)
Purchases	65,317		—		—		—		—		—		246		65,563
Paid-in-kind interest	9,834		—		—		4,340		—		—		—		14,174
Sales and repayments	(76,948)		(73,544)		(107)		(1,500)		(162,115)		—		(39,822)		(354,036)
Transfers into Level 3(1)	—		—		—		—		—		—		810		810
Transfers out of Level 3	—		—		—		—		—		—		—		—
Fair value at end of period	$	392,383	$	69,599	$	9,780	$	57,743	$	259,205	$	49,192	$	339,457	$	1,177,359
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	$	(50,106)	$	(591)	$	(229)	$	416	$	25,880	$	(1,906)	$	(108,706)	$	(135,242)

	For the Nine Months Ended September 30, 2022
	Senior Secured Loans—First Lien		Senior Secured Loans—Second Lien		Senior Secured Bonds		Unsecured Debt		Preferred Equity		Sustainable Infrastructure Investments, LLC		Equity/Other		Total
Fair value at beginning of period	$	414,075	$	84,083	$	10,371	$	104,659	$	497,288	$	50,770	$	460,236	$	1,621,482
Accretion of discount (amortization of premium)	1,426		194		36		105		3,473		—		—		5,234
Net realized gain (loss)	(12,186)		446		—		(27,541)		1,329		—		64,960		27,008
Net change in unrealized appreciation (depreciation)	26,048		(201)		(212)		34,394		(9,441)		1,277		82,667		134,532
Purchases	110,486		110,150		—		19,800		—		—		16,052		256,488
Paid-in-kind interest	9,627		537		—		7,916		188		—		—		18,268
Sales and repayments	(122,163)		(49,577)		—		(84,415)		(61,186)		—		(104,518)		(421,859)
Transfers into Level 3(1)	58,705		—		—		—		—		—		2,836		61,541
Transfers out of Level 3	—		—		—		—		—		—		—		—
Fair value at end of period	$	486,018	$	145,632	$	10,195	$	54,918	$	431,651	$	52,047	$	522,233	$	1,702,694
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	$	16,286	$	22	$	(212)	$	(293)	$	(6,787)	$	1,277	$	83,316	$	93,609

______________

(1)    Changes in inputs or methodologies used for valuing investments may result in transfers into or out of levels within the fair value hierarchy. Transfers between levels of the fair value hierarchy are deemed to have occurred at the beginning of the reporting period. For the nine months ended September 30, 2023 and 2022, transfers into Level 3 were due to decreased price transparency.

The valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements as of September 30, 2023 and December 31, 2022 were as follows:

Type of Investment	Fair Value at September 30, 2023 (Unaudited)		Valuation Technique(1)	Unobservable Input	Range	Weighted Average
Senior Secured Loans—First Lien	$	358,949	Market Comparables	Market Yield (%)	8.8%-21.3%	13.6%
				EBITDA Multiples (x)	3.9x-7.7x	5.4x
	4,275		Discounted Cash Flow	Discount Rate (%)	9.0%-14.0%	11.5%
	19,400		Cost
	9,759		Other(2)
Senior Secured Loans—Second Lien	69,599		Market Comparables	Market Yield (%)	12.7%-14.5%	13.6%
Senior Secured Bonds	9,780		Market Comparables	Market Yield (%)	7.8%-8.8%	8.3%
Unsecured Debt	18,284		Market Comparables	Market Yield (%)	10.8%-11.8%	11.3%
	39,459		Other(2)
Preferred Equity	259,205		Market Comparables	Market Yield (%)	11.0%-26.8%	20.1%
				EBITDA Multiples (x)	13.3x-14.3x	13.8x
				Net Aircraft Book Value Multiple (x)	1.0x-1.0x	1.0x
Sustainable Infrastructure Investments, LLC	49,192		Discounted Cash Flow	Discount Rate (%)	13.5%-14.5%	14.0%
Equity/Other	308,680		Market Comparables	EBITDA Multiples (x)	2.8x-14.3x	6.1x
				Production Multiples (Mboe/d)	$26,591.0-$29,529.0	$28,060.0
				Proved Reserves Multiples (Mmboe)	$5.6-$6.2	$5.9
				Production Multiples (MMcfe/d)	$3,000.0-$3,600.0	$3,300.0
				Proved Reserves Multiples (Bcfe)	0.7x-0.7x	0.7x
				PV-10 Multiples (x)	0.3x-0.9x	0.8x
	2,478		Discounted Cash Flow	Discount Rate (%)	8.0%-35.0%	11.7%
	11,250		Option Valuation Model	Volatility (%)	27.2%-65.0%	36.4%
	17,049		Other(2)
Total	$	1,177,359

Type of Investment	Fair Value at December 31, 2022		Valuation Technique(1)	Unobservable Input	Range	Weighted Average
Senior Secured Loans—First Lien	$	413,268	Market Comparables	Market Yield (%)	8.5%-21.8%	12.3%
				EBITDA Multiples (x)	5.0x-7.5x	6.3x
	29,977		Discounted Cash Flow	Discount Rate (%)	11.5%-19.5%	15.4%
Senior Secured Loans—Second Lien	143,270		Market Comparables	Market Yield (%)	10.3%-14.3%	11.8%
Senior Secured Bonds	10,074		Market Comparables	Market Yield (%)	6.9%-7.9%	7.4%
Unsecured Debt	19,256		Market Comparables	Market Yield (%)	10.3%-11.3%	10.8%
	35,118		Other(2)
Preferred Equity	316,767		Market Comparables	Market Yield (%)	8.8%-30.3%	19.0%
				EBITDA Multiples (x)	9.5x-10.5x	10.0x
				Net Aircraft Book Value Multiple (x)	1.0x-1.0x	1.0x
	83,647		Discounted Cash Flow	Discount Rate (%)	11.3%-12.3%	11.8%
Sustainable Infrastructure Investments, LLC	51,098		Discounted Cash Flow	Discount Rate (%)	13.5%-14.5%	14.0%
Equity/Other	481,623		Market Comparables	EBITDA Multiples (x)	1.8x-10.5x	5.4x
				Production Multiples (Mboe/d)	$27,946.0-$37,500.0	$30,265.3
				Proved Reserves Multiples (Mmboe)	$6.9-$10.3	$7.6
				Production Multiples (MMcfe/d)	$3,400.0-$3,700.0	$3,550.0
				Proved Reserves Multiples (Bcfe)	0.8x-0.9x	0.8x
				PV-10 Multiples (x)	0.5x-0.9x	0.8x
	2,488		Discounted Cash Flow	Discount Rate (%)	8.0%-33.0%	23.8%
	5,734		Option Valuation Model	Volatility (%)	31.5%-55.1%	36.6%
	1,885		Other(2)
Total	$	1,594,205

______________

(1)    For investments utilizing a market comparables valuation technique, a significant increase (decrease) in the market yield, in isolation, would result in a significantly lower (higher) fair value measurement, and a significant increase (decrease) in any of the valuation multiples, in isolation, would result in a significantly higher (lower) fair value measurement. For investments utilizing a discounted cash flow valuation technique, a significant increase (decrease) in the discount rate, in isolation, would result in a significantly lower (higher) fair value measurement. For investments utilizing an option valuation model valuation technique, a significant increase (decrease) in the volatility, in isolation, would result in a significantly higher (lower) fair value measurement.

(2)    Fair valued based on expected outcome of proposed corporate transactions, the expected value of the liquidation preference of the investment or other factors.

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Financing Arrangements

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Financing Arrangements

Financing Arrangements

The following tables present a summary of information with respect to the Company’s outstanding financing arrangements as of September 30, 2023 and December 31, 2022. For additional information regarding these financing arrangements, see the notes to the Company’s audited consolidated financial statements contained in its annual report on Form 10-K for the year ended December 31, 2022. Any significant changes to the Company’s financing arrangements during the nine months ended September 30, 2023 are discussed below.

	As of September 30, 2023  (Unaudited)
Arrangement(1)	Type of Arrangement	Rate(2)	Amount Outstanding		Amount Available		Maturity Date
Barclays Facility	Repurchase	Term SOFR+3.42%	$	80,000	$	420,000	September 6, 2026
Total			$	80,000	$	420,000

	As of December 31, 2022
Arrangement(1)	Type of Arrangement	Rate(4)	Amount Outstanding		Amount Available		Maturity Date
JPMorgan Facility	Term Loan	L+3.00%	$	305,676	$	—	February 16, 2023(5)
Senior Secured Notes(3)	Bond	7.50%	457,075		—		August 15, 2023(6)
Total			$	762,751	$	—

______________________

(1)    The carrying amount outstanding under the facility approximates its fair value, unless otherwise noted.

(2)    The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the Collateral Obligations (such individual margins ranging from 1.90% to 4.20%, depending on the type of Collateral Obligations; subject to a floor, in the aggregate, of 3.00%).

(3)    As of December 31, 2022, the fair value of the Senior Secured Notes was approximately $458,908. This valuation is considered a Level 2 valuation within the fair value hierarchy.

(4)    LIBOR was subject to a 0.00% floor.

(5)    On February 14, 2023, the Company repaid and terminated the JPMorgan Facility.

(6)    On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.

For the nine months ended September 30, 2023 and 2022, the components of total interest expense for the Company's financing arrangements were as follows:

	Nine Months Ended September 30,
	2023						2022
Arrangement(1)	Direct Interest Expense(2)		Amortization of Deferred Financing Costs and Discount		Total Interest Expense		Direct Interest Expense(2)		Amortization of Deferred Financing Costs and Discount		Total Interest Expense
Barclays Facility	$	613	$	125	$	738	$	—	$	—	$	—
JPMorgan Facility(3)	2,790		238		3,028		9,458		1,830		11,288
Senior Secured Notes(4)	12,760		2,540		15,300		26,381		3,325		29,706
Total	$	16,163	$	2,903	$	19,066	$	35,839	$	5,155	$	40,994

___________________

(1)     Borrowings of each of the Company's wholly-owned special-purpose financing subsidiaries are considered borrowings of the Company for purposes of complying with the asset coverage requirements applicable to BDCs under the 1940 Act.

(2)     Direct interest expense includes the effect of non-usage fees, administration fees and make-whole fees, if any.

(3)     On February 14, 2023, the Company repaid and terminated the JPMorgan Facility.

(4)    On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.

The Company’s average borrowings and weighted average interest rate for the period from January 1, 2023 to May 15, 2023, the date on which the Company redeemed 100% of the issued and outstanding Senior Secured Notes, were $557,446 and 7.49%, respectively. The Company had no outstanding borrowings during the period from May 15, 2023 to September 5, 2023. The Company’s average borrowings and weighted average interest rate, including the effect of non-usage fees, for the period from September 6, 2023 (the date on which the Company entered into the Barclays Facility) to September 30, 2023, were $80,000 and 11.03%, respectively. As of September 30, 2023, the Company’s effective interest rate on borrowings, including the effect of non-usage fees, was 8.90%.

The Company’s average borrowings and weighted average interest rate, including the effect of non-usage fees, for the nine months ended September 30, 2022 were $770,774 and 7.01%, respectively. As of September 30, 2022, the Company’s effective interest rate on borrowings was 6.93%.

Under its financing arrangements, the Company made certain representations and warranties and was required to comply with various covenants, reporting requirements and other customary requirements for similar financing arrangements. The Company was in compliance with all covenants required by its financing arrangements as of September 30, 2023 and December 31, 2022.

Barclays Facility

On September 6, 2023, the Company, through two wholly-owned, special purpose financing subsidiaries, FSSL Finance BB AssetCo LLC, or FSSL Finance BB AssetCo, and FSSL Finance BB Seller LLC, or FSSL Finance BB Seller, entered into a financing arrangement with Barclays Bank PLC, or Barclays, pursuant to which up to $500,000 will be made available to fund investments in loans and other corporate securities, or together, the Collateral Obligations, and for other general corporate purposes, or the Barclays Facility.

The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the Collateral Obligations (such individual margins ranging from 1.90% to 4.20%, depending on the type of Collateral Obligations; subject to a floor, in the aggregate, of 3.00%).

Pursuant to the financing arrangement, the Company may contribute Collateral Obligations from time to time to FSSL Finance BB AssetCo, pursuant to a Sale and Contribution Agreement, dated as of September 6, 2023, between the Company and FSSL Finance BB AssetCo, or the Sale and Contribution Agreement. The assets held by FSSL Finance BB AssetCo secure the obligations of FSSL Finance BB AssetCo under the notes, or the Notes, issued by FSSL Finance BB AssetCo to FSSL Finance BB Seller, pursuant to an indenture, dated as of September 6, 2023, with Computershare Trust Company, N.A., or Computershare, as trustee, or the Indenture.

Principal on the Notes will be due and payable on the stated maturity date of July 1, 2033, and the Notes do not bear interest. Pursuant to the Indenture, FSSL Finance BB AssetCo has made certain representations and warranties and is required to comply with various covenants, reporting requirements and other customary requirements for similar transactions. The Indenture contains events of default customary for similar transactions, including, without limitation: (a) failure to make principal payments on the Notes at their stated maturity or any earlier redemption date or to make interest payments on the Notes; (b) failure to disburse amounts in accordance with the priority of payments; (c) occurrence of certain bankruptcy and insolvency events with respect to FSSL Finance BB AssetCo; and (d) occurrence of a Repurchase Date under the Repurchase Agreement (defined below) as a result of an event of default with respect to FSSL Finance BB Seller. FSSL Finance BB Seller acquired and subscribed for the Notes pursuant to a Subscription Agreement, dated as of September 6, 2023, between FSSL Finance BB AssetCo and FSSL Finance BB Seller as the investor.

On September 6, 2023, FSSL Finance BB Seller entered into a Master Confirmation in respect of Repurchase Transaction with Barclays, or the Confirmation, which supplements and is subject to the Master Repurchase Agreement, dated as of September 6, 2023, between FSSL Finance BB Seller and Barclays, or the Master Repurchase Agreement, and such Master Repurchase Agreement, as supplemented and evidenced by the Confirmation, or the Repurchase Agreement. Pursuant to the Repurchase Agreement, on September 6, 2023, Barclays purchased the Notes held by FSSL Finance BB Seller for an initial purchase price of $80,000, which price may, subject to satisfaction of certain conditions, increase from time to time up to the maximum aggregate purchase price of $500,000. The scheduled Repurchase Date is September 6, 2026.

Pursuant to the Repurchase Agreement, FSSL Finance BB Seller has made certain representations and warranties and is required to comply with various covenants, reporting requirements and other customary requirements for similar transactions. The Repurchase Agreement contains events of default customary for similar financing transactions, including, without limitation: (a) failure to pay the repurchase price upon the applicable payment dates; (b) failure to pay the financing fees and make-whole amounts when due; (c) failure to post collateral as required; (d) occurrence of an event of default under the Indenture, (e) occurrence of insolvency events with respect to FSSL Finance BB Seller; (f) cross default by the Company with respect to its indebtedness above a certain threshold amount and (g) financial covenant breach by the Company.

On September 6, 2023, Notes in an aggregate principal amount of $80,000 were purchased by FSSL Finance BB Seller from FSSL Finance BB AssetCo and subsequently sold to Barclays under the Barclays Facility for aggregate proceeds of $74,502. The carrying amount outstanding under the Barclays Facility approximates its fair value. The Company funded the purchase of Notes by FSSL Finance BB Seller through a capital contribution to FSSL Finance BB Seller. The Notes issued by FSSL Finance BB AssetCo and purchased by FSSL Finance BB Seller eliminate in consolidation on the Company's financial statements.

The Company incurred costs of $5,498 in connection with obtaining the Barclays Facility, which the Company has recorded as deferred financing costs on its consolidated balance sheet and amortizes to interest expense over the life of the Barclays Facility. As of September 30, 2023, $5,373 of such deferred financing costs had yet to be amortized to interest expense.

JPMorgan Facility

On August 16, 2018, the Company entered into that certain Senior Secured Credit Agreement, by and among the Company, the lenders party thereto, JPMorgan Chase Bank, N.A., or JPMorgan, as administrative agent and collateral agent, and the other parties signatory thereto, or as amended, the JPMorgan Facility. On February 14, 2023, the Company repaid and terminated the JPMorgan Facility. Prior to the termination of the JPMorgan Facility, $305,676 aggregate principal amount of loans were outstanding to the Company and such loans accrued interest at a rate equal to LIBOR (subject to a 0.00% floor) plus 3.00% per annum. The Company incurred certain customary costs and expenses in connection with the termination of the JPMorgan Facility.

7.500% Senior Secured Notes due 2023

On August 16, 2018, the Company, U.S. Bank National Association, or U.S Bank, as trustee, and certain subsidiaries of the Company, entered into an Indenture relating to the Company’s issuance of $500,000 aggregate principal amount of its 7.500% Senior Secured Notes due 2023, or the Senior Secured Notes. On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023. The Company incurred certain customary costs and expenses in connection with the redemption of the Senior Secured Notes.

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Commitment and Contingencies

9 Months Ended

Sep. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company enters into contracts that contain a variety of indemnification provisions. The Company’s maximum exposure under these arrangements is unknown; however, the Company has not had prior claims or losses pursuant to these contracts. FS/EIG Advisor has reviewed the Company’s existing contracts and expects the risk of loss to the Company to be remote.

The Company is not currently subject to any material legal proceedings and, to the Company’s knowledge, no material legal proceedings are threatened against the Company. From time to time, the Company may be a party to certain legal proceedings in the ordinary course of business, including proceedings relating to the enforcement of the Company’s rights under contracts with its portfolio companies. While the outcome of any legal proceedings cannot be predicted with certainty, the Company does not expect that any such proceedings will have a material effect upon its financial condition or results of operations.

See Note 4 for a discussion of the Company’s commitments to FS/EIG Advisor and its affiliates (including FS Investments) and Note 7 for a discussion of the Company’s unfunded commitments.

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Financial Highlights

9 Months Ended

Sep. 30, 2023

Investment Company [Abstract]

Financial Highlights

Financial Highlights

The following is a schedule of financial highlights of the Company for the nine months ended September 30, 2023 and the year ended December 31, 2022:

	Nine Months Ended September 30, 2023 (Unaudited)			Year Ended December 31, 2022
Per Share Data:(1)
Net asset value, beginning of period	$	3.88		$	3.59
Results of operations(2)
Net investment income	0.12			0.16
Net realized gain (loss) and unrealized appreciation (depreciation)	(0.30)			0.25
Net increase (decrease) in net assets resulting from operations	(0.18)			0.41
Shareholder distributions(3)
Distributions from net investment income	(0.06)			(0.12)
Net decrease in net assets resulting from shareholder distributions	(0.06)			(0.12)
Capital share transactions
Issuance of common shares(4)	—			—
Net increase (decrease) in net assets resulting from capital share transactions	—			—
Net asset value, end of period	$	3.64		$	3.88
Shares outstanding, end of period	455,506,234			451,465,673
Total return(5)	(4.70)		%	11.39		%
Total return (without assuming reinvestment of distributions)(5)	(4.64)		%	11.29		%
Ratio/Supplemental Data:
Net assets, end of period	$	1,657,461		$	1,753,748
Ratio of net investment income to average net assets(6)(7)	4.30		%	4.02		%
Ratio of total operating expenses to average net assets(6)	4.60		%	6.78		%
Ratio of management fee offset to average net assets(6)	(0.02)		%	(0.15)		%
Ratio of net operating expenses to average net assets(6)	4.58		%	6.63		%
Ratio of interest expense to average net assets(6)	1.47		%	3.21		%
Ratio of federal and state taxes to average net assets(6)	0.17		%	0.13		%
Portfolio turnover(8)	14.79		%	16.15		%
Total amount of senior securities outstanding, exclusive of treasury securities	$	80,000		$	762,751
Asset coverage per unit(9)	21.72			3.30

_________________________

(1)    Per share data may be rounded in order to recompute the ending net asset value per share.

(2)    The per share data was derived by using the weighted average shares outstanding during the applicable period.

(3)    The per share data for distributions reflects the actual amount of distributions paid per share during the applicable period.

(4)    The issuance of common shares on a per share basis reflects the incremental net asset value changes as a result of the issuance of common shares pursuant to the Company’s distribution reinvestment plan. The issuance of common shares at a price that is greater than the net asset value per share results in an increase in net asset value per share.

(5)    The total return for each period presented was calculated based on the change in net asset value during the applicable period, including the impact of distributions reinvested in accordance with the Company’s distribution reinvestment plan. Following the termination of the Company’s distribution reinvestment plan effective September 15, 2023, the total return for each period presented subsequent to the effective date was calculated based on the change in net asset value during the applicable period, assuming the reinvestment of all distributions at the Company’s net asset value per share as of the period end date. The total return (without assuming reinvestment of distributions) for each period presented was calculated by taking the net asset value per share as of the end of the applicable period, adding the cash distributions per share which were declared during the applicable period and dividing the total by the net asset value per share at the beginning of the applicable period. The total returns do not consider the effect of any sales commissions or charges that may be incurred in connection with the sale of the Company’s common shares. The total returns include the effect of the issuance of common shares at a net offering price that is greater than net asset value per share, which causes an increase in net asset value per share. The historical calculations of total returns in the table should not be considered representations of the Company’s future total returns, which may be greater or less than the returns shown in the table due to a number of factors, including the Company’s ability or inability to make investments in companies that meet its investment criteria, the interest rates payable on the debt securities the Company acquires, the level of the Company’s expenses, variations in and the timing of the recognition of realized and unrealized gains or losses, the degree to which the Company encounters competition in its markets and general economic conditions. As a result of these factors, results for any previous period should not be relied upon as being indicative of performance in future periods. The total return calculations set forth above represent the total returns on the Company’s investment portfolio during the applicable period and do not represent actual returns to shareholders.

(6)    Weighted average net assets during the applicable period are used for this calculation. Ratios for the nine months ended September 30, 2023 are annualized. Annualized ratios for the nine months ended September 30, 2023 are not necessarily indicative of the ratios that may be expected for the year ending December 31, 2023.

(7)    If FS/EIG Advisor had not agreed to offset the amount of any structuring, upfront or certain other fees it or its members received against the management fee payable by the Company, the ratio of net investment income to average net assets would have been 4.28% and 3.87% for the nine months ended September 30, 2023 and the year ended December 31, 2022, respectively. See Note 4 for a discussion of the management fee offset with FS/EIG Advisor.

(8)    Portfolio turnover for the nine months ended September 30, 2023 is not annualized.

(9)    Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness.

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Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss) Attributable to Parent	$ (27,423)	$ (51,101)	$ (84,628)	$ 154,262

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Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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N-2 - USD ($)
$ / shares in Units, $ in Thousands

9 Months Ended

Sep. 30, 2023

Dec. 31, 2022

Dec. 31, 2021

Cover [Abstract]

Entity Central Index Key

0001501729

Amendment Flag

false

Securities Act File Number

814-00841

Document Type

10-Q

Entity Registrant Name

FS Specialty Lending Fund

Entity Address, Address Line One

201 Rouse Boulevard

Entity Address, City or Town

Philadelphia

Entity Address, State or Province

PA

Entity Address, Postal Zip Code

19112

City Area Code

215

Local Phone Number

495-1150

Entity Emerging Growth Company

false

Financial Highlights [Abstract]

Senior Securities Amount

$ 80,000

$ 762,751

General Description of Registrant [Abstract]

Investment Objectives and Practices [Text Block]

On May 15, 2023, we announced that our board of trustees approved our transition from an investment policy of investing primarily in Energy companies to a diversified credit investment policy of investing across private and public credit in a broader set of industries, sectors and sub-sectors. We commenced transitioning our portfolio holdings away from Energy investments in May 2023, while remaining in compliance with our then-current investment policy. Following a shareholder notice period, the new policy became effective on September 29, 2023. Our allocation to Energy investments is expected to decline over time through the natural course of maturities, repayments and sales activity and by growing the total size of the portfolio through leverage facilities. The pace of the portfolio rotation is dependent upon a number of factors, including the turnover of concentrated illiquid Energy investments, performance of underlying portfolio companies, high yield and energy market conditions, our access to borrowings and the amount and pace of the payment of enhanced distributions to shareholders, among others.

Our current investment policy is to invest primarily in a portfolio of secured and unsecured floating and fixed rate loans, bonds and other types of credit instruments, which, under normal circumstances, will represent at least 80% of our total assets. This investment policy may not be changed without at least 60 days’ prior notice to holders of our common shares of any such change.

Our current investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation. We intend to pursue our investment objectives by investing in both direct originations and broadly syndicated investments of secured and unsecured floating and fixed rate loans, bonds and other types of credit instruments. Investing in both direct originations and broadly syndicated investments allows us to be dynamic in our pursuit of opportunities across changing economic and credit cycles. We intend to focus on the following investment categories in an effort to generate returns for our investors with an acceptable level of risk.

•    Direct Originations: Direct lending and innovative capital structure solutions to both sponsored and non-sponsored companies, typically based in the U.S. and operating within the middle market. These investments may include both debt and equity components.

•    Broadly Syndicated Loan and Bond Transactions: Opportunistic investments into primary and secondary market, broadly syndicated loans and bonds. Broadly syndicated loans and bonds are generally more liquid than our directly originated investments and provide a complement to our less liquid strategies.

In the case of broadly syndicated investments, we generally intend to capitalize on market inefficiencies by investing in loans, bonds, and other asset classes where the market price of such investment reflects a lower value than we believe is warranted based on our fundamental analysis, providing us with an opportunity to earn an attractive return on our investment.

However, we may pursue other investment opportunities if we believe they are in our best interests and consistent with our investment objectives.

Prior to September 29, 2023, our investment policy was to invest, under normal circumstances, at least 80% of our total assets in securities of Energy companies and our investment objectives were to generate current income and long-term capital appreciation. We pursued our previous investment objectives by focusing on the following seven investment themes: (i) basin-on-basin competition in U.S. shale, (ii) globalization of natural gas, (iii) coal retirements and the evolving energy generation mix, (iv) renewables focused on power grid parity, (v) export infrastructure for emerging U.S. producers, (vi) market liberalization opening new markets and (vii) midstream infrastructure connecting new supplies. However, we could pursue other investment opportunities if we believed they were in our best interests and consistent with our then-current investment objectives.

The majority of our portfolio is comprised of income-oriented securities, which principally refers to debt securities and income-oriented preferred and common equity interests, of privately-held Energy companies within the United States although we expect our portfolio to shift away from investments in privately-held Energy companies as we transition to a diversified credit strategy. Generally, in the long-term we expect to invest primarily in directly originated investments and primary market transactions, as this will provide us with the ability to tailor investments to best match a project’s or company’s needs with our investment objectives. We intend to weight our portfolio towards senior secured debt, which we believe offers opportunities for superior risk-adjusted returns and income generation. Our debt investments may take the form of corporate or project loans or bonds, may be secured or unsecured and may, in some cases, be accompanied by yield enhancements. These yield enhancements are typically expected to include warrants, options, net profits interests, cash flow participations or other forms of equity participation that can provide additional consideration or “upside” in a transaction. A portion of our portfolio may be comprised of derivatives, including the use of total return swaps, credit default swaps and other commodity swap contracts. In connection with certain of our debt investments or any restructuring of these debt investments, we may on occasion receive equity interests, including warrants or options, as additional consideration or otherwise in connection with a restructuring. FS/EIG Advisor will seek to tailor our investment focus as market conditions evolve.

Our future financial condition, results of operations and cash flows may be impacted by the transition to a new investment policy.

NAV Per Share

$ 3.64

$ 3.88

$ 3.59

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Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP, for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. For a more complete discussion of significant accounting policies and certain other information, the Company’s interim unaudited consolidated financial statements should be read in conjunction with its audited consolidated financial statements as of and for the year ended December 31, 2022 included in the Company’s annual report on Form 10-K. Operating results for the nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023. The December 31, 2022 consolidated balance sheet and consolidated schedule of investments are derived from the Company's audited consolidated financial statements as of and for the year ended December 31, 2022. The Company is considered an investment company under GAAP and follows the accounting and reporting guidance applicable to investment companies under Accounting Standards Codification Topic 946, Financial Services—Investment Companies. The Company has evaluated the impact of subsequent events through the date the unaudited consolidated financial statements were issued and filed with the Securities and Exchange Commission, or the SEC.
Use of Estimates	Use of Estimates: The preparation of the unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Many of the amounts have been rounded, and all amounts are in thousands, except share and per share amounts.
Capital Gains Incentive Fee and Subordinated Income Incentive Fee	Capital Gains Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, the incentive fee on capital gains is determined and payable in arrears as of the end of each calendar year (or upon termination of such agreement). Such fee equals 20.0% of the Company’s “incentive fee capital gains,” which are the Company’s realized capital gains on a cumulative basis from inception, calculated as of the end of the applicable period, computed net of all realized capital losses and unrealized capital depreciation on a cumulative basis, less the aggregate amount of any previously paid incentive fees on capital gains. The Company will accrue for the incentive fee on capital gains, which, if earned, will be paid annually. The Company will accrue the incentive fee on capital gains based on net realized and unrealized gains; however, the fee payable to FS/EIG Advisor will be based on realized gains and no such fee will be payable with respect to unrealized gains unless and until such gains are actually realized.Subordinated Income Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, FS/EIG Advisor may also be entitled to receive a subordinated incentive fee on income. The subordinated incentive fee on income under the FS/EIG investment advisory agreement is calculated and payable quarterly in arrears and equals 20.0% of the Company’s “pre-incentive fee net investment income” for the immediately preceding quarter subject to a hurdle rate, expressed as a rate of return on adjusted capital, equal to 1.625% per quarter, or an annualized hurdle rate of 6.5%. As a result, FS/EIG Advisor will not earn this incentive fee for any quarter until the Company’s pre-incentive fee net investment income for such quarter exceeds the hurdle rate of 1.625%. For purposes of this fee, “adjusted capital” means cumulative gross proceeds generated from sales of the Company’s common shares (including proceeds from its distribution reinvestment plan) reduced for distributions from non-liquidating dispositions of the Company’s investments paid to shareholders and amounts paid for share repurchases pursuant to the Company’s share repurchase program. Once the Company’s pre-incentive fee net investment income in any quarter exceeds the hurdle rate, FS/EIG Advisor will be entitled to a “catch-up” fee equal to the amount of the Company’s pre-incentive fee net investment income in excess of the hurdle rate, until the Company’s pre-incentive fee net investment income for such quarter equals 2.031%, or 8.125% annually, of adjusted capital. This “catch-up” feature will allow FS/EIG Advisor to recoup the fees foregone as a result of the existence of the hurdle rate. Thereafter, FS/EIG Advisor will be entitled to receive 20.0% of the Company’s pre-incentive fee net investment income.
Reclassifications	Reclassifications: Certain amounts in the unaudited consolidated financial statements for the nine months ended September 30, 2022 may have been reclassified to conform to the classifications used to prepare the unaudited consolidated financial statements for the nine months ended September 30, 2023
Revenue Recognition	Revenue Recognition: Security transactions are accounted for on the trade date. The Company records interest income on an accrual basis to the extent that it expects to collect such amounts. The Company records dividend income on the ex-dividend date. Distributions received from limited liability company, or LLC, and limited partnership, or LP, investments are evaluated to determine if the distribution should be recorded as dividend income or a return of capital. The Company does not accrue as a receivable interest or dividends on loans and securities if it has reason to doubt its ability to collect such income. The Company’s policy is to place investments on non-accrual status when there is reasonable doubt that interest income will be collected. The Company considers many factors relevant to an investment when placing it on or removing it from non-accrual status including, but not limited to, the delinquency status of the investment, economic and business conditions, the overall financial condition of the underlying investment, the value of the underlying collateral, bankruptcy status, if any, and any other facts or circumstances relevant to the investment. If there is reasonable doubt that the Company will receive any previously accrued interest, then the accrued interest will be written-off. Payments received on non-accrual investments may be recognized as income or applied to principal depending upon the collectability of the remaining principal and interest. Non-accrual investments may be restored to accrual status when principal and interest become current and are likely to remain current based on the Company’s judgment.Loan origination fees, original issue discount and market discount are capitalized and the Company amortizes such amounts as interest income over the respective term of the loan or security. Upon the prepayment of a loan or security, any unamortized loan origination fees and original issue discount are recorded as interest income. Structuring and other non-recurring upfront fees are recorded as fee income when earned. The Company records prepayment premiums on loans and securities as fee income when it earns such amounts.
Net Realized Gains or Realized Losses on Extinguishment of Debt	Net Realized Gains or Realized Losses on Extinguishment of Debt: Upon the repayment of debt obligations which are deemed to be extinguishments, the difference between the principal amount due at maturity and the amount repaid on the extinguishment of debt is recognized as a gain or loss.
Derivative Instruments	Derivative Instruments: The Company’s derivative instruments may include fixed price swaps and equity total return swaps. The Company recognizes all derivative instruments as assets or liabilities at fair value in its consolidated financial statements. Derivative contracts entered into by the Company are not designated as hedging instruments for accounting purposes, and as a result, the Company presents changes in fair value through net change in unrealized appreciation (depreciation) on swap contracts in the consolidated statements of operations. Realized gains and losses of the derivative instruments are included in net realized gain (loss) on swap contracts in the consolidated statements of operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements: In March 2020, the FASB issued Accounting Standards Update No. 2020-04, Reference Rate Reform (Topic 848), or ASU 2020-04, which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. In January 2021, the FASB issued Accounting Standards Update No. 2021-01, Reference Rate Reform (Topic 848), or ASU 2021-01, which expanded the scope of Topic 848 to include derivative instruments impacted by discounting transition. ASU 2020-04 and ASU 2021-01 are effective for all entities through December 31, 2022. The expedients and exceptions provided by the amendments do not apply to contract modifications and hedging relationships entered into or evaluated after December 31, 2022, except for hedging transactions as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. In December 2022, the FASB issued Accounting Standards Update No. 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, or ASU 2022-06, which deferred the sunset date of this guidance to December 31, 2024. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

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Share Transactions (Tables)

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Schedule of Common Stock Transactions

Below is a summary of transactions with respect to the Company’s common shares during the nine months ended September 30, 2023 and 2022:

	Nine Months Ended September 30,
	2023			2022
	Shares	Amount		Shares	Amount
Reinvestment of Distributions(1)	4,040,561	$	15,549	4,040,233	$	15,651
Proceeds from Share Transactions	4,040,561	$	15,549	4,040,233	$	15,651

______________

(1)    On September 15, 2023, the Company's second amended and restated distribution reinvestment plan terminated.

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Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2023

Related Party Transactions [Abstract]

Schedule of the Fees and Expenses Accrued Under Investment Advisory Agreement

The following table describes the fees and expenses accrued under the FS/EIG investment advisory agreement during the three and nine months ended September 30, 2023 and 2022:

			Three Months Ended September 30,				Nine Months Ended September 30,
Related Party	Source Agreement	Description	2023		2022		2023		2022
FS/EIG Advisor	FS/EIG investment advisory agreement	Base Management Fee(1)	$	7,715	$	11,142	$	26,620	$	30,755
FS/EIG Advisor	FS/EIG investment advisory agreement	Administrative Services Expenses(2)	$	1,887	$	1,695	$	4,566	$	4,605

_________________________

(1)    During the nine months ended September 30, 2023 and 2022, $30,090 and $30,079, respectively, in base management fees were paid to FS/EIG Advisor. The base management fee amount shown in the table above is shown net of $63 and $208 in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees for the three months ended September 30, 2023 and 2022, respectively, and $337 and $2,606 in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees for the nine months ended September 30, 2023 and 2022, respectively. As of September 30, 2023, $7,715 in base management fees were payable to FS/EIG Advisor.

(2)    During the nine months ended September 30, 2023 and 2022, $2,386 and $1,999, respectively, of the accrued administrative services expenses related to the allocation of costs of administrative personnel for services rendered to the Company by FS/EIG Advisor and the remainder related to other reimbursable expenses. The Company paid $4,017 and $3,284 in administrative services expenses to FS/EIG Advisor, or its affiliates, during the nine months ended September 30, 2023 and 2022, respectively.

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Distributions (Tables)

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Schedule of Cash Distributions Paid on Common Stock Including Tax Basis

The following table reflects the cash distributions per share that the Company declared on its common shares during the nine months ended September 30, 2023 and 2022:

	Distribution
For the Three Months Ended	Per Share		Amount
Fiscal 2022
March 31, 2022	$	0.03	$	13,426
June 30, 2022	0.03		13,465
September 30, 2022	0.03		13,504
Total	$	0.09	$	40,395
Fiscal 2023
March 31, 2023	$	0.03	$	13,584
June 30, 2023	0.03		13,624
September 30, 2023	—		—
Total	$	0.06	$	27,208

The following table reflects the sources of the cash distributions on a tax basis that the Company declared on its common shares during the nine months ended September 30, 2023 and 2022:

	Nine Months Ended September 30,
	2023				2022
Source of Distribution	Distribution Amount		Percentage		Distribution Amount		Percentage
Net investment income(1)	$	27,208	100	%	$	40,395	100	%
Short-term capital gains proceeds from the sale of assets	—		—		—		—
Long-term capital gains proceeds from the sale of assets	—		—		—		—
Total	$	27,208	100	%	$	40,395	100	%

_________________________

(1)    During the nine months ended September 30, 2023 and 2022, 83.8% and 80.9%, respectively, of the Company's gross investment income was attributable to cash income earned, 12.3% and 14.7%, respectively, was attributable to paid-in-kind, or PIK, interest and 3.9% and 4.4%, respectively, was attributable to non-cash accretion of discount.

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Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fixed Price Swap Positions

The following table presents the fair value of open swap contracts (which are not considered to be hedging instruments for accounting purposes) as of September 30, 2023 and December 31, 2022:

	September 30, 2023 (Unaudited)				December 31, 2022
Instrument	Asset(1)		Liability(2)		Asset(1)		Liability(2)
Commodity Fixed Price Swaps—Crude Oil	$	—	$	(404)	$	—	$	(572)
Commodity Fixed Price Swaps—Natural Gas	36		—		—		(126)
Equity Total Return Swaps	70		—		—		—
Total	$	106	$	(404)	$	—	$	(698)

______________

(1)    Reflected on the Company's consolidated balance sheets as: Unrealized appreciation on swap contracts.

(2)    Reflected on the Company's consolidated balance sheets as: Unrealized depreciation on swap contracts.

Schedule of Realized and Unrealized Gain (Loss) on Derivative Instruments

The effect of swap contracts (which are not considered to be hedging instruments for accounting purposes) on the Company's statements of operations for the nine months ended September 30, 2023 and 2022 was as follows:

	Net Realized Gains (Losses)(1)				Net Change in Unrealized Appreciation (Depreciation)(2)
	Nine Months Ended September 30,				Nine Months Ended September 30,
Instrument	2023		2022		2023		2022
Commodity Fixed Price Swaps—Crude Oil	$	(259)	$	(1,968)	$	168	$	672
Commodity Fixed Price Swaps—Natural Gas	348		(652)		162		(678)
Equity Total Return Swaps	(1)		—		70		—
Total	$	88	$	(2,620)	$	400	$	(6)

______________

(1)    Reflected on the Company's consolidated statements of operations as: Net realized gain (loss) on swap contracts.

(2)    Reflected on the Company's consolidated statements of operations as: Net change in unrealized appreciation (depreciation) on swap contracts.

Schedule of Offsetting Liabilities

The following tables present the Company’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement and net of any collateral received or pledged by the Company for such assets and liabilities as of September 30, 2023 and December 31, 2022:

	As of September 30, 2023 (Unaudited)
Counterparty	Derivative Assets		Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)		Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	$	36	$	(404)	$	(368)	—	—		$	(368)
Nomura Global Financial Products Inc.	$	70	—		$	70	—	$	(70)	—

	As of December 31, 2022
Counterparty	Derivative Assets	Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)	Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	—	$	(698)	$	(698)	—	—	$	(698)

______________

(1)    In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization.

(2)    Net amount of derivative assets and liabilities represents the net amount due from the counterparty to the Company and the net amount due from the Company to the counterparty, respectively, in the event of default.

Schedule of Offsetting Assets

The following tables present the Company’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement and net of any collateral received or pledged by the Company for such assets and liabilities as of September 30, 2023 and December 31, 2022:

	As of September 30, 2023 (Unaudited)
Counterparty	Derivative Assets		Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)		Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	$	36	$	(404)	$	(368)	—	—		$	(368)
Nomura Global Financial Products Inc.	$	70	—		$	70	—	$	(70)	—

	As of December 31, 2022
Counterparty	Derivative Assets	Derivative Liabilities		Net Value of Derivatives		Non-Cash Collateral (Received) Pledged(1)	Cash Collateral (Received) Pledged(1)	Net Amount of Derivative Assets (Liabilities)(2)
BP Energy Co.	—	$	(698)	$	(698)	—	—	$	(698)

______________

(1)    In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization.

(2)    Net amount of derivative assets and liabilities represents the net amount due from the counterparty to the Company and the net amount due from the Company to the counterparty, respectively, in the event of default.

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Investment Portfolio (Tables)

9 Months Ended

Sep. 30, 2023

Schedule of Investments [Abstract]

Schedule of Investments

The following table summarizes the composition of the Company’s investment portfolio at cost and fair value as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)						December 31, 2022
	Amortized Cost(1)		Fair Value		Percentage of Portfolio		Amortized Cost(1)		Fair Value		Percentage of Portfolio
Senior Secured Loans—First Lien	$	675,016	$	631,307	42	%	$	702,842	$	706,646	35	%
Senior Secured Loans—Second Lien	70,267		69,599		5	%	143,153		143,270		7	%
Senior Secured Bonds	33,385		32,681		2	%	10,064		10,074		0	%
Unsecured Debt	108,367		109,302		7	%	253,675		241,418		12	%
Preferred Equity	252,450		259,205		18	%	425,182		400,414		20	%
Sustainable Infrastructure Investments, LLC	54,514		49,192		3	%	54,514		51,098		2	%
Equity/Other	259,083		341,480		23	%	333,510		494,195		24	%
Total	$	1,453,082	$	1,492,766	100	%	$	1,922,940	$	2,047,115	100	%

______________

(1)    Amortized cost represents the original cost adjusted for the amortization of premiums and/or accretion of discounts, as applicable, on investments.

The table below describes investments by industry classification and enumerates the percentage, by fair value, of the total portfolio assets in such industries as of September 30, 2023 and December 31, 2022:

	September 30, 2023 (Unaudited)				December 31, 2022
Industry Classification	Fair Value		Percentage of Portfolio		Fair Value		Percentage of Portfolio
Energy—Upstream	$	533,790	36	%	$	854,974	42	%
Energy—Midstream	423,991		28	%	646,488		32	%
Energy—Power	194,940		13	%	386,007		19	%
Consumer Services	51,022		3	%	—		—
Energy—Service & Equipment(1)	49,724		3	%	96,040		5	%
Capital Goods	29,821		2	%	—		—
Consumer Discretionary Distribution & Retail	27,975		2	%	—		—
Commercial & Professional Services(1)	22,062		2	%	12,508		0	%
Household & Personal Products	20,297		1	%	—		—
Financial Services	19,939		1	%	—		—
Pharmaceuticals, Biotechnology & Life Sciences	19,400		1	%	—		—
Insurance	11,275		1	%	—		—
Transportation	9,851		1	%	—		—
Automobiles & Components	9,849		1	%	—		—
Consumer Staples Distribution & Retail	9,844		1	%	—		—
Health Care Equipment & Services	9,794		1	%	—		—
Sustainable Infrastructure Investments, LLC(2)	49,192		3	%	51,098		2	%
Total	$	1,492,766	100	%	$	2,047,115	100	%

_____________________

(1)    FS/EIG Advisor monitors the industry classification of the Company’s investments and may from time to time reclassify such investments if it determines such reclassification is appropriate. During the nine months ended September 30, 2023, two investments had their industry re-classified from Energy—Industrials to Commercial & Professional Services, and one investment had its industry re-classified from Energy—Service & Equipment to Commercial & Professional Services.

(2)    Sustainable Infrastructure Investments, LLC is generally comprised of midstream and renewables assets in the Energy sector.

Schedule of Nonconsolidated Subsidiary Portfolio

Below is a summary of SIIJV's portfolio, followed by a listing of the individual loans in SIIJV's portfolio as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)			December 31, 2022
Total investments(1)	$	192,881		$	274,088
Weighted average current interest rate on debt investments(2)	7.35		%	6.96		%
Number of portfolio assets in SIIJV	8			9
Largest investment in a single portfolio company(1)	$	57,784		$	73,707

_____________________

(1)    At cost.

(2)    Computed as the (a) annual stated interest rate on accruing debt, divided by (b) total debt at par amount.

Sustainable Infrastructure Investments, LLC Portfolio

As of September 30, 2023

(Unaudited)

Portfolio Company(a)(f)	Footnotes	Energy Industry	Rate(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Lien—100.0%
Blue Heron Intermediate Holdco I, LLC		Midstream	S+188	4/22/24	$	30,958	$	30,958	$	31,004
Cedar Creek II LLC		Renewables	S+188	11/18/23	8,160		8,160		8,166
Copper Mountain Solar 3, LLC		Renewables	S+188	5/31/25	17,105		17,105		17,209
FLNG Liquefaction 2, LLC		Midstream	S+150	12/31/26	26,972		26,972		26,835
Meikle Wind Energy, LP	(e)	Renewables	C+150	5/12/24	C$	15,431	11,872		11,405
NES Hercules Class B Member, LLC		Renewables	S+163	1/31/28	$	24,176	24,176		24,596
ST EIP Holdco LLC		Midstream	S+250	11/5/24	57,784		57,784		57,577
Top of the World Wind Energy LLC		Renewables	S+213	12/1/28	15,854		15,854		16,137
Total Senior Secured Loans—First Lien							192,881		192,929
TOTAL INVESTMENTS—100.0%							$	192,881	$	192,929

Sustainable Infrastructure Investments, LLC Portfolio

As of December 31, 2022

Portfolio Company(a)(f)	Footnotes	Industry	Rate(b)	Maturity	Principal Amount(c)		Amortized Cost		Fair Value(d)
Senior Secured Loans—First Lien—100.0%
Alianca Transportadora de Gas Participacoes S.A.		Midstream	L+260	5/23/27	$	73,707	$	73,707	$	74,601
Blue Heron Intermediate Holdco I, LLC		Midstream	L+188	4/22/24	31,832		31,832		31,885
Cedar Creek II LLC		Renewables	L+188	11/18/23	8,710		8,710		8,722
Copper Mountain Solar 3, LLC		Renewables	L+175	5/31/25	17,804		17,804		17,879
FLNG Liquefaction 2, LLC		Midstream	L+150	12/31/26	28,170		28,170		27,990
Meikle Wind Energy, LP	(e)	Renewables	C+150	5/12/24	C$	16,030	12,332		11,873
NES Hercules Class B Member, LLC		Renewables	L+150	1/31/28	$	24,487	24,487		24,954
ST EIP Holdco LLC		Midstream	L+250	11/5/24	58,673		58,673		58,288
Top of the World Wind Energy LLC		Renewables	L+188	12/1/28	18,373		18,373		18,866
Total Senior Secured Loans—First Lien							274,088		275,058
TOTAL INVESTMENTS—100.0%							$	274,088	$	275,058

_____________________

Percentages are shown as a percentage of total investments.

(a)    Security may be an obligation of one or more entities affiliated with the named company.

(b)    Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023 and December 31, 2022, the three-month LIBOR, or L, was 5.66% and 4.77%, respectively, the Canadian Dollar Offered Rate, or C, was 5.51% and 4.94%, respectively, and the SOFR, or S, was 5.40% and 4.59%, respectively.

(c)    Denominated in U.S. dollars unless otherwise noted.

(d)    Security is classified as Level 3 and fair value is determined in accordance with the Company’s valuation process.

(e)    Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of September 30, 2023 and December 31, 2022.

(f)    Security or portion thereof is held within Seine Funding and is pledged as collateral supporting the amounts outstanding under the Seine Funding Facility.

Below is selected balance sheet information for SIIJV as of September 30, 2023 and December 31, 2022:

	September 30, 2023  (Unaudited)		December 31, 2022
Selected Balance Sheet Information
Total investments, at fair value	$	192,929	$	275,058
Cash and other assets	78,241		10,380
Total assets	$	271,170	$	285,438
Debt	$	195,734	$	213,583
Other liabilities	3,159		3,358
Total liabilities	198,893		216,941
Member's equity	$	72,277	$	68,497

Below is selected statement of operations information for SIIJV for the three and nine months ended September 30, 2023 and 2022:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Selected Statement of Operations Information
Total investment income	$	5,272	$	3,313	$	15,083	$	7,386
Expenses
Interest expense	3,410		1,201		9,870		3,352
Administrative services	46		42		134		123
Custodian and accounting fees	58		23		161		127
Professional services	70		25		170		76
Other	11		44		31		44
Total expenses	3,595		1,335		10,366		3,722
Net investment income	1,677		1,978		4,717		3,664
Net realized and unrealized gain (loss)	(2,273)		836		(937)		(1,180)
Net increase (decrease) in net assets resulting from operations	$	(596)	$	2,814	$	3,780	$	2,484

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Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of Fair Value Hierarchy of Investments

As of September 30, 2023 and December 31, 2022, the Company’s investments were categorized as follows in the fair value hierarchy:

Valuation Inputs	September 30, 2023  (Unaudited)		December 31, 2022
Level 1—Price quotations in active markets	$	2,023	$	2,465
Level 2—Significant other observable inputs	313,384		450,445
Level 3—Significant unobservable inputs	1,177,359		1,594,205
Total	$	1,492,766	$	2,047,115

Schedule of Fair Value Hierarchy of Assets and Liabilities

As of September 30, 2023 and December 31, 2022, the Company’s swap contracts were categorized as follows in the fair value hierarchy:

	September 30, 2023  (Unaudited)				December 31, 2022
Valuation Inputs	Assets		Liabilities		Assets		Liabilities
Level 1—Price quotations in active markets	$	—	$	—	$	—	$	—
Level 2—Significant other observable inputs	106		404		—		698
Level 3—Significant unobservable inputs	—		—		—		—
Total	$	106	$	404	$	—	$	698

Schedule of Fair Value of Assets Rollforward

The following is a reconciliation for the nine months ended September 30, 2023 and 2022 of investments for which significant unobservable inputs (Level 3) were used in determining fair value:

	For the Nine Months Ended September 30, 2023
	Senior Secured Loans—First Lien		Senior Secured Loans—Second Lien		Senior Secured Bonds		Unsecured Debt		Preferred Equity		Sustainable Infrastructure Investments, LLC		Equity/Other		Total
Fair value at beginning of period	$	443,245	$	143,270	$	10,074	$	54,374	$	400,414	$	51,098	$	491,730	$	1,594,205
Accretion of discount (amortization of premium)	1,369		710		38		105		1,230		—		—		3,452
Net realized gain (loss)	(2,864)		(52)		4		8		(11,847)		—		(34,851)		(49,602)
Net change in unrealized appreciation (depreciation)	(47,570)		(785)		(229)		416		31,523		(1,906)		(78,656)		(97,207)
Purchases	65,317		—		—		—		—		—		246		65,563
Paid-in-kind interest	9,834		—		—		4,340		—		—		—		14,174
Sales and repayments	(76,948)		(73,544)		(107)		(1,500)		(162,115)		—		(39,822)		(354,036)
Transfers into Level 3(1)	—		—		—		—		—		—		810		810
Transfers out of Level 3	—		—		—		—		—		—		—		—
Fair value at end of period	$	392,383	$	69,599	$	9,780	$	57,743	$	259,205	$	49,192	$	339,457	$	1,177,359
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	$	(50,106)	$	(591)	$	(229)	$	416	$	25,880	$	(1,906)	$	(108,706)	$	(135,242)

	For the Nine Months Ended September 30, 2022
	Senior Secured Loans—First Lien		Senior Secured Loans—Second Lien		Senior Secured Bonds		Unsecured Debt		Preferred Equity		Sustainable Infrastructure Investments, LLC		Equity/Other		Total
Fair value at beginning of period	$	414,075	$	84,083	$	10,371	$	104,659	$	497,288	$	50,770	$	460,236	$	1,621,482
Accretion of discount (amortization of premium)	1,426		194		36		105		3,473		—		—		5,234
Net realized gain (loss)	(12,186)		446		—		(27,541)		1,329		—		64,960		27,008
Net change in unrealized appreciation (depreciation)	26,048		(201)		(212)		34,394		(9,441)		1,277		82,667		134,532
Purchases	110,486		110,150		—		19,800		—		—		16,052		256,488
Paid-in-kind interest	9,627		537		—		7,916		188		—		—		18,268
Sales and repayments	(122,163)		(49,577)		—		(84,415)		(61,186)		—		(104,518)		(421,859)
Transfers into Level 3(1)	58,705		—		—		—		—		—		2,836		61,541
Transfers out of Level 3	—		—		—		—		—		—		—		—
Fair value at end of period	$	486,018	$	145,632	$	10,195	$	54,918	$	431,651	$	52,047	$	522,233	$	1,702,694
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	$	16,286	$	22	$	(212)	$	(293)	$	(6,787)	$	1,277	$	83,316	$	93,609

______________

(1)    Changes in inputs or methodologies used for valuing investments may result in transfers into or out of levels within the fair value hierarchy. Transfers between levels of the fair value hierarchy are deemed to have occurred at the beginning of the reporting period. For the nine months ended September 30, 2023 and 2022, transfers into Level 3 were due to decreased price transparency.

Schedule of Valuation Techniques and Significant Unobservable Inputs Used in Recurring Level 3 Fair Value

The valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements as of September 30, 2023 and December 31, 2022 were as follows:

Type of Investment	Fair Value at September 30, 2023 (Unaudited)		Valuation Technique(1)	Unobservable Input	Range	Weighted Average
Senior Secured Loans—First Lien	$	358,949	Market Comparables	Market Yield (%)	8.8%-21.3%	13.6%
				EBITDA Multiples (x)	3.9x-7.7x	5.4x
	4,275		Discounted Cash Flow	Discount Rate (%)	9.0%-14.0%	11.5%
	19,400		Cost
	9,759		Other(2)
Senior Secured Loans—Second Lien	69,599		Market Comparables	Market Yield (%)	12.7%-14.5%	13.6%
Senior Secured Bonds	9,780		Market Comparables	Market Yield (%)	7.8%-8.8%	8.3%
Unsecured Debt	18,284		Market Comparables	Market Yield (%)	10.8%-11.8%	11.3%
	39,459		Other(2)
Preferred Equity	259,205		Market Comparables	Market Yield (%)	11.0%-26.8%	20.1%
				EBITDA Multiples (x)	13.3x-14.3x	13.8x
				Net Aircraft Book Value Multiple (x)	1.0x-1.0x	1.0x
Sustainable Infrastructure Investments, LLC	49,192		Discounted Cash Flow	Discount Rate (%)	13.5%-14.5%	14.0%
Equity/Other	308,680		Market Comparables	EBITDA Multiples (x)	2.8x-14.3x	6.1x
				Production Multiples (Mboe/d)	$26,591.0-$29,529.0	$28,060.0
				Proved Reserves Multiples (Mmboe)	$5.6-$6.2	$5.9
				Production Multiples (MMcfe/d)	$3,000.0-$3,600.0	$3,300.0
				Proved Reserves Multiples (Bcfe)	0.7x-0.7x	0.7x
				PV-10 Multiples (x)	0.3x-0.9x	0.8x
	2,478		Discounted Cash Flow	Discount Rate (%)	8.0%-35.0%	11.7%
	11,250		Option Valuation Model	Volatility (%)	27.2%-65.0%	36.4%
	17,049		Other(2)
Total	$	1,177,359

Type of Investment	Fair Value at December 31, 2022		Valuation Technique(1)	Unobservable Input	Range	Weighted Average
Senior Secured Loans—First Lien	$	413,268	Market Comparables	Market Yield (%)	8.5%-21.8%	12.3%
				EBITDA Multiples (x)	5.0x-7.5x	6.3x
	29,977		Discounted Cash Flow	Discount Rate (%)	11.5%-19.5%	15.4%
Senior Secured Loans—Second Lien	143,270		Market Comparables	Market Yield (%)	10.3%-14.3%	11.8%
Senior Secured Bonds	10,074		Market Comparables	Market Yield (%)	6.9%-7.9%	7.4%
Unsecured Debt	19,256		Market Comparables	Market Yield (%)	10.3%-11.3%	10.8%
	35,118		Other(2)
Preferred Equity	316,767		Market Comparables	Market Yield (%)	8.8%-30.3%	19.0%
				EBITDA Multiples (x)	9.5x-10.5x	10.0x
				Net Aircraft Book Value Multiple (x)	1.0x-1.0x	1.0x
	83,647		Discounted Cash Flow	Discount Rate (%)	11.3%-12.3%	11.8%
Sustainable Infrastructure Investments, LLC	51,098		Discounted Cash Flow	Discount Rate (%)	13.5%-14.5%	14.0%
Equity/Other	481,623		Market Comparables	EBITDA Multiples (x)	1.8x-10.5x	5.4x
				Production Multiples (Mboe/d)	$27,946.0-$37,500.0	$30,265.3
				Proved Reserves Multiples (Mmboe)	$6.9-$10.3	$7.6
				Production Multiples (MMcfe/d)	$3,400.0-$3,700.0	$3,550.0
				Proved Reserves Multiples (Bcfe)	0.8x-0.9x	0.8x
				PV-10 Multiples (x)	0.5x-0.9x	0.8x
	2,488		Discounted Cash Flow	Discount Rate (%)	8.0%-33.0%	23.8%
	5,734		Option Valuation Model	Volatility (%)	31.5%-55.1%	36.6%
	1,885		Other(2)
Total	$	1,594,205

______________

(1)    For investments utilizing a market comparables valuation technique, a significant increase (decrease) in the market yield, in isolation, would result in a significantly lower (higher) fair value measurement, and a significant increase (decrease) in any of the valuation multiples, in isolation, would result in a significantly higher (lower) fair value measurement. For investments utilizing a discounted cash flow valuation technique, a significant increase (decrease) in the discount rate, in isolation, would result in a significantly lower (higher) fair value measurement. For investments utilizing an option valuation model valuation technique, a significant increase (decrease) in the volatility, in isolation, would result in a significantly higher (lower) fair value measurement.

(2)    Fair valued based on expected outcome of proposed corporate transactions, the expected value of the liquidation preference of the investment or other factors.

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Financing Arrangements (Tables)

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Schedule of Outstanding Financing Arrangements

The following tables present a summary of information with respect to the Company’s outstanding financing arrangements as of September 30, 2023 and December 31, 2022. For additional information regarding these financing arrangements, see the notes to the Company’s audited consolidated financial statements contained in its annual report on Form 10-K for the year ended December 31, 2022. Any significant changes to the Company’s financing arrangements during the nine months ended September 30, 2023 are discussed below.

	As of September 30, 2023  (Unaudited)
Arrangement(1)	Type of Arrangement	Rate(2)	Amount Outstanding		Amount Available		Maturity Date
Barclays Facility	Repurchase	Term SOFR+3.42%	$	80,000	$	420,000	September 6, 2026
Total			$	80,000	$	420,000

	As of December 31, 2022
Arrangement(1)	Type of Arrangement	Rate(4)	Amount Outstanding		Amount Available		Maturity Date
JPMorgan Facility	Term Loan	L+3.00%	$	305,676	$	—	February 16, 2023(5)
Senior Secured Notes(3)	Bond	7.50%	457,075		—		August 15, 2023(6)
Total			$	762,751	$	—

______________________

(1)    The carrying amount outstanding under the facility approximates its fair value, unless otherwise noted.

(2)    The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the Collateral Obligations (such individual margins ranging from 1.90% to 4.20%, depending on the type of Collateral Obligations; subject to a floor, in the aggregate, of 3.00%).

(3)    As of December 31, 2022, the fair value of the Senior Secured Notes was approximately $458,908. This valuation is considered a Level 2 valuation within the fair value hierarchy.

(4)    LIBOR was subject to a 0.00% floor.

(5)    On February 14, 2023, the Company repaid and terminated the JPMorgan Facility.

(6)    On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.

Schedule of Interest Expense

For the nine months ended September 30, 2023 and 2022, the components of total interest expense for the Company's financing arrangements were as follows:

	Nine Months Ended September 30,
	2023						2022
Arrangement(1)	Direct Interest Expense(2)		Amortization of Deferred Financing Costs and Discount		Total Interest Expense		Direct Interest Expense(2)		Amortization of Deferred Financing Costs and Discount		Total Interest Expense
Barclays Facility	$	613	$	125	$	738	$	—	$	—	$	—
JPMorgan Facility(3)	2,790		238		3,028		9,458		1,830		11,288
Senior Secured Notes(4)	12,760		2,540		15,300		26,381		3,325		29,706
Total	$	16,163	$	2,903	$	19,066	$	35,839	$	5,155	$	40,994

___________________

(1)     Borrowings of each of the Company's wholly-owned special-purpose financing subsidiaries are considered borrowings of the Company for purposes of complying with the asset coverage requirements applicable to BDCs under the 1940 Act.

(2)     Direct interest expense includes the effect of non-usage fees, administration fees and make-whole fees, if any.

(3)     On February 14, 2023, the Company repaid and terminated the JPMorgan Facility.

(4)    On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.

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Financial Highlights (Tables)

9 Months Ended

Sep. 30, 2023

Investment Company [Abstract]

Schedule of Financial Highlights

The following is a schedule of financial highlights of the Company for the nine months ended September 30, 2023 and the year ended December 31, 2022:

	Nine Months Ended September 30, 2023 (Unaudited)			Year Ended December 31, 2022
Per Share Data:(1)
Net asset value, beginning of period	$	3.88		$	3.59
Results of operations(2)
Net investment income	0.12			0.16
Net realized gain (loss) and unrealized appreciation (depreciation)	(0.30)			0.25
Net increase (decrease) in net assets resulting from operations	(0.18)			0.41
Shareholder distributions(3)
Distributions from net investment income	(0.06)			(0.12)
Net decrease in net assets resulting from shareholder distributions	(0.06)			(0.12)
Capital share transactions
Issuance of common shares(4)	—			—
Net increase (decrease) in net assets resulting from capital share transactions	—			—
Net asset value, end of period	$	3.64		$	3.88
Shares outstanding, end of period	455,506,234			451,465,673
Total return(5)	(4.70)		%	11.39		%
Total return (without assuming reinvestment of distributions)(5)	(4.64)		%	11.29		%
Ratio/Supplemental Data:
Net assets, end of period	$	1,657,461		$	1,753,748
Ratio of net investment income to average net assets(6)(7)	4.30		%	4.02		%
Ratio of total operating expenses to average net assets(6)	4.60		%	6.78		%
Ratio of management fee offset to average net assets(6)	(0.02)		%	(0.15)		%
Ratio of net operating expenses to average net assets(6)	4.58		%	6.63		%
Ratio of interest expense to average net assets(6)	1.47		%	3.21		%
Ratio of federal and state taxes to average net assets(6)	0.17		%	0.13		%
Portfolio turnover(8)	14.79		%	16.15		%
Total amount of senior securities outstanding, exclusive of treasury securities	$	80,000		$	762,751
Asset coverage per unit(9)	21.72			3.30

_________________________

(1)    Per share data may be rounded in order to recompute the ending net asset value per share.

(2)    The per share data was derived by using the weighted average shares outstanding during the applicable period.

(3)    The per share data for distributions reflects the actual amount of distributions paid per share during the applicable period.

(4)    The issuance of common shares on a per share basis reflects the incremental net asset value changes as a result of the issuance of common shares pursuant to the Company’s distribution reinvestment plan. The issuance of common shares at a price that is greater than the net asset value per share results in an increase in net asset value per share.

(5)    The total return for each period presented was calculated based on the change in net asset value during the applicable period, including the impact of distributions reinvested in accordance with the Company’s distribution reinvestment plan. Following the termination of the Company’s distribution reinvestment plan effective September 15, 2023, the total return for each period presented subsequent to the effective date was calculated based on the change in net asset value during the applicable period, assuming the reinvestment of all distributions at the Company’s net asset value per share as of the period end date. The total return (without assuming reinvestment of distributions) for each period presented was calculated by taking the net asset value per share as of the end of the applicable period, adding the cash distributions per share which were declared during the applicable period and dividing the total by the net asset value per share at the beginning of the applicable period. The total returns do not consider the effect of any sales commissions or charges that may be incurred in connection with the sale of the Company’s common shares. The total returns include the effect of the issuance of common shares at a net offering price that is greater than net asset value per share, which causes an increase in net asset value per share. The historical calculations of total returns in the table should not be considered representations of the Company’s future total returns, which may be greater or less than the returns shown in the table due to a number of factors, including the Company’s ability or inability to make investments in companies that meet its investment criteria, the interest rates payable on the debt securities the Company acquires, the level of the Company’s expenses, variations in and the timing of the recognition of realized and unrealized gains or losses, the degree to which the Company encounters competition in its markets and general economic conditions. As a result of these factors, results for any previous period should not be relied upon as being indicative of performance in future periods. The total return calculations set forth above represent the total returns on the Company’s investment portfolio during the applicable period and do not represent actual returns to shareholders.

(6)    Weighted average net assets during the applicable period are used for this calculation. Ratios for the nine months ended September 30, 2023 are annualized. Annualized ratios for the nine months ended September 30, 2023 are not necessarily indicative of the ratios that may be expected for the year ending December 31, 2023.

(7)    If FS/EIG Advisor had not agreed to offset the amount of any structuring, upfront or certain other fees it or its members received against the management fee payable by the Company, the ratio of net investment income to average net assets would have been 4.28% and 3.87% for the nine months ended September 30, 2023 and the year ended December 31, 2022, respectively. See Note 4 for a discussion of the management fee offset with FS/EIG Advisor.

(8)    Portfolio turnover for the nine months ended September 30, 2023 is not annualized.

(9)    Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness.

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Principal Business and Organization (Details)	Sep. 29, 2023	Sep. 28, 2023
Debt and Other Credit Investments
Schedule of Investments [Line Items]
Percentage of investments total assets	80.00%
Energy Investment
Schedule of Investments [Line Items]
Percentage of investments total assets		80.00%

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Fee income	$ 591	$ 0
Investment Advisory Agreement - Incentive Rate, Realized Capital Gains | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee (in percent)	20.00%
Investment Advisory Agreement - Incentive Rate, Quarterly In Arrears Catch-up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee (in percent)	20.00%
Investment Advisory Agreement - Incentive Rate, Quarterly Catch-up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee (in percent)	1.625%
Investment Advisory Agreement - Incentive Rate, Annualized Hurdle Rate | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee (in percent)	6.50%
Investment Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee (in percent)	2.031%
Investment Advisory Agreement - Incentive Rate, Annualized Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee (in percent)	8.125%

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Share Transactions - Schedule of Common Stock Transactions (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity [Abstract]
Reinvestment of Distributions (in shares)				4,040,561	4,040,233
Reinvestment of Distributions	[1]	$ 5,161	$ 5,191	$ 15,549	$ 15,651
Proceeds from Share Transactions (in shares)				4,040,561	4,040,233
Proceeds from Share Transactions				$ 15,549	$ 15,651

[1] See Note 3 for a discussion of the Company's common share transactions.

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Share Transactions - Narrative (Details) - Distribution Reinvestment Plan - USD ($) $ in Thousands			9 Months Ended
	May 05, 2017	May 04, 2017	Sep. 30, 2023
Class of Stock [Line Items]
Weighted average number of common shares outstanding in prior year	10.00%	10.00%
Weighted average number of common shares outstanding	2.50%	2.50%
Distribution reinvestment plan term	12 months
Distribution reinvestment plan term expiree	3 months
Share distribution not more than net asset value per common share			2.50%
Termination period			30 days
Minimum investment threshold			$ 5
Written notice period			30 days

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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Investment company, contractual fee waived	[1]	$ 63	$ 208	$ 337	$ 2,606
Investment Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Management and service fees, base rate				1.75%
Investment company, contractual fee waived		$ 63	$ 208	$ 337	$ 2,606

[1] See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.

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Related Party Transactions - Schedule of the Fees and Expenses Accrued (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Administrative services expenses		$ 1,887	$ 1,695	$ 4,566	$ 4,605
Management fees		7,778	11,350	26,957	33,361
Investment company, contractual fee waived	[1]	63	208	337	2,606
Management fees payable		7,715		7,715		$ 11,185
Affiliated Entity | Investment Advisory Agreement
Related Party Transaction [Line Items]
Base management fee		7,715	11,142	26,620	30,755
Management fees				30,090	30,079
Investment company, contractual fee waived		63	208	337	2,606
Management fees payable		7,715		7,715
Accounting and administrative fees				2,386	1,999
Payment for administrative services expenses				4,017	3,284
Affiliated Entity | Administrative Services Expense
Related Party Transaction [Line Items]
Administrative services expenses		$ 1,887	$ 1,695	$ 4,566	$ 4,605

[1] See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.

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Distributions - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended				12 Months Ended
	Sep. 30, 2023		Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022		Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022
Income Tax Disclosure [Abstract]
Distributions (in USD per share)	$ 0		$ 0.03	$ 0.03	$ 0.03		$ 0.03	$ 0.03	$ 0.06		$ 0.09		$ 0.12
Amount	$ 0	[1]	$ 13,624	$ 13,584	$ 13,504	[1]	$ 13,465	$ 13,426	$ 27,208	[1]	$ 40,395	[1]

[1] See Note 5 for a discussion of the sources of distributions paid by the Company.

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Distributions - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended						9 Months Ended		12 Months Ended
	Oct. 18, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Investment Company, Changes in Net Assets [Line Items]
Distributions (in USD per share)		$ 0	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.06	$ 0.09	$ 0.12
Net asset value common share percentage								2.50%
Short-term and long-term capital loss carryforwards		$ (73,519)						$ (73,519)		$ (1,451,516)
Unrealized appreciation		203,031						203,031		334,635
Unrealized depreciation		262,695						262,695		512,206
Income tax purposes		1,552,114						1,552,114		2,223,943
Net unrealized appreciation (depreciation)		(59,348)						(59,348)		(176,828)
Subsidiaries
Investment Company, Changes in Net Assets [Line Items]
Deferred tax asset		151,115						151,115		145,383
Deferred tax liability		3,129						3,129		28,753
Deferred tax asset offset by valuation allowance		$ 147,986						147,986		116,630
Current income tax								$ 0		$ 1,207
Subsequent Event
Investment Company, Changes in Net Assets [Line Items]
Distributions (in USD per share)	$ 0.0683
Annualized distribution rate	7.50%
Maximum cap on annualized distribution rate	15.00%

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Distributions - Cash Distributions on Common Stock (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended
	Sep. 30, 2023	[1]	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	[1]	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023		Sep. 30, 2022
Distribution Amount
Net investment income									$ 27,208		$ 40,395
Short-term capital gains proceeds from the sale of assets									0		0
Long-term capital gains proceeds from the sale of assets									0		0
Total	$ 0		$ 13,624	$ 13,584	$ 13,504		$ 13,465	$ 13,426	$ 27,208	[1]	$ 40,395	[1]
Percentage
Net investment income									100.00%		100.00%
Short-term capital gains proceeds from the sale of assets									0.00%		0.00%
Long-term capital gains proceeds from the sale of assets									0.00%		0.00%
Total									100.00%		100.00%
Gross investment income attributable to cash income earned									83.80%		80.90%
Gross investment income attributable to paid-in-kind interest									12.30%		14.70%
Gross investment income attributable to non-cash accretion of discount									3.90%		4.40%

[1] See Note 5 for a discussion of the sources of distributions paid by the Company.

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Financial Instruments - Narrative (Details)	9 Months Ended
	Sep. 30, 2023 USD ($) MMBTU bbl
Commodity Fixed Price Swaps—Crude Oil
Derivative [Line Items]
Notional volume of fixed price swap contracts-crude oil | bbl	109,764
Commodity Fixed Price Swaps—Natural Gas
Derivative [Line Items]
Notional volume of fixed price swap contracts-natural gas | MMBTU	198,215
Equity Total Return Swaps
Derivative [Line Items]
Term of contract	3 years
Average monthly notional amount | $	$ 1,721,000

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Financial Instruments - Fair Value of Open Swap Contracts (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative Assets	$ 106	$ 0
Derivative Liabilities	(404)	(698)
Commodity Fixed Price Swaps—Crude Oil
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(404)	(572)
Commodity Fixed Price Swaps—Natural Gas
Derivative [Line Items]
Derivative Assets	36	0
Derivative Liabilities	0	(126)
Equity Total Return Swaps
Derivative [Line Items]
Derivative Assets	70	0
Derivative Liabilities	$ 0	$ 0

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Financial Instruments - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)	$ (138)	$ (812)	$ 88	$ (2,620)
Net Change in Unrealized Appreciation (Depreciation)	$ (803)	$ 3,582	400	(6)
Commodity Fixed Price Swaps—Crude Oil
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)			(259)	(1,968)
Net Change in Unrealized Appreciation (Depreciation)			168	672
Commodity Fixed Price Swaps—Natural Gas
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)			348	(652)
Net Change in Unrealized Appreciation (Depreciation)			162	(678)
Equity Total Return Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)			(1)	0
Net Change in Unrealized Appreciation (Depreciation)			$ 70	$ 0

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Financial Instruments - Derivative Assets and Liabilities by Counterparty (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 106	$ 0
Derivative Liabilities	(404)	(698)
BP Energy Co
Derivatives, Fair Value [Line Items]
Derivative Assets	36	0
Derivative Liabilities	(404)	(698)
Net Value of Derivatives	(368)	(698)
Non-Cash Collateral (Received) Pledged	0	0
Cash Collateral (Received) Pledged	0	0
Net Amount of Derivative Assets (Liabilities)	(368)	$ (698)
Nomura Global Financial Products Inc.
Derivatives, Fair Value [Line Items]
Derivative Assets	70
Derivative Liabilities	0
Net Value of Derivatives	70
Non-Cash Collateral (Received) Pledged	0
Cash Collateral (Received) Pledged	(70)
Net Amount of Derivative Assets (Liabilities)	$ 0

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Investment Portfolio - Schedule Of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023		Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost	$ 1,453,082	[1]	$ 1,922,940	[2]
Fair Value	1,492,766	[1],[3]	2,047,115	[2],[4]
Net Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Amortized Cost	675,016	[1]	702,842	[2]
Fair Value	631,307	[1],[3]	706,646	[2],[4]
Net Senior Secured Loans—Second Lien
Schedule of Investments [Line Items]
Amortized Cost	70,267	[1]	143,153	[2]
Fair Value	69,599	[1],[3]	143,270	[2],[4]
Senior Secured Bonds
Schedule of Investments [Line Items]
Amortized Cost	33,385	[1]	10,064	[2]
Fair Value	32,681	[1],[3]	10,074	[2],[4]
Unsecured Debt
Schedule of Investments [Line Items]
Amortized Cost	108,367		253,675
Fair Value	109,302		241,418
Preferred Equity
Schedule of Investments [Line Items]
Amortized Cost	252,450	[1]	425,182	[2]
Fair Value	259,205	[1],[3]	400,414	[2],[4]
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Amortized Cost	54,514	[1]	54,514	[2]
Fair Value	49,192	[1],[3]	51,098	[2],[4]
Equity/Other
Schedule of Investments [Line Items]
Amortized Cost	259,083		333,510
Fair Value	$ 341,480		$ 494,195
Percentage of Portfolio | Customer Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	100.00%		100.00%
Percentage of Portfolio | Customer Concentration Risk | Net Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Percentage of Portfolio	42.00%		35.00%
Percentage of Portfolio | Customer Concentration Risk | Net Senior Secured Loans—Second Lien
Schedule of Investments [Line Items]
Percentage of Portfolio	5.00%		7.00%
Percentage of Portfolio | Customer Concentration Risk | Senior Secured Bonds
Schedule of Investments [Line Items]
Percentage of Portfolio	2.00%		0.00%
Percentage of Portfolio | Customer Concentration Risk | Unsecured Debt
Schedule of Investments [Line Items]
Percentage of Portfolio	7.00%		12.00%
Percentage of Portfolio | Customer Concentration Risk | Preferred Equity
Schedule of Investments [Line Items]
Percentage of Portfolio	18.00%		20.00%
Percentage of Portfolio | Customer Concentration Risk | Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Percentage of Portfolio	3.00%		2.00%
Percentage of Portfolio | Customer Concentration Risk | Equity/Other
Schedule of Investments [Line Items]
Percentage of Portfolio	23.00%		24.00%

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] Security may be an obligation of one or more entities affiliated with the named company.

[3] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

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Investment Portfolio - Narrative (Details) $ in Thousands, $ in Thousands				9 Months Ended
		Jan. 02, 2020 USD ($)	Jan. 02, 2020 CAD ($)	Sep. 30, 2023 USD ($) company investment	Sep. 30, 2023 CAD ($) company investment	Dec. 31, 2022 USD ($) company investment	Dec. 31, 2022 CAD ($) company investment
Schedule of Investments [Line Items]
Unfunded commitment with amortized cost						$ 2,500
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4],[5]			$ 22,970
Floor rate	[2],[3],[4],[5],[6]			1.50%	1.50%
Variable rate	[2],[3],[4],[5],[6]			4.00%	4.00%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[10],[11]					$ 22,734
Floor rate	[8],[9],[10],[11],[12]					1.50%	1.50%
Variable rate	[8],[9],[10],[11]					4.00%	4.00%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[10],[11],[13]					$ 5,359
Floor rate	[8],[9],[10],[11],[12],[13]					1.50%	1.50%
Variable rate	[8],[9],[10],[11],[13]					4.00%	4.00%
Investment, Identifier [Axis]: Acrisure LLC, Insurance
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 11,191
Floor rate	[3],[6],[14],[15]			1.00%	1.00%
Variable rate	[3],[6],[14],[15]			5.75%	5.75%
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					$ 20,000
Floor rate	[8],[9],[12],[16]					1.50%	1.50%
Variable rate	[8],[9],[16]					7.50%	7.50%
Investment, Identifier [Axis]: Aethon United BR LP, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[3]			$ 40,500
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[16]					$ 40,500
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16],[17]					8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[13],[17]					2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 5,500
Floor rate	[3],[6],[14],[15]			0.50%	0.50%
Variable rate	[3],[6],[14],[15]			4.75%	4.75%
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 9,954
Floor rate	[3],[6],[14]			0.50%	0.50%
Variable rate	[3],[6],[14]			3.75%	3.75%
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14],[18],[19],[20]			$ 70,277
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16],[17]					63,888
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[11],[16]					3,098
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 9,949
Floor rate	[3],[6],[14]			0.50%	0.50%
Variable rate	[3],[6],[14]			3.75%	3.75%
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 14,975
Floor rate	[3],[6],[14],[15]			0.50%	0.50%
Variable rate	[3],[6],[14],[15]			4.75%	4.75%
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 39,259
Variable rate	[9]					4.00%	4.00%
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	[1],[3]			$ 997
Variable rate	[3],[6]			5.50%	5.50%
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 14,286
Floor rate	[9],[12]					1.00%	1.00%
Variable rate	[9]					4.00%	4.00%
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 23,172
Variable rate	[3],[6],[14]			3.75%	3.75%
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 23,601
Variable rate	[9]					3.75%	3.75%
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16],[21],[22]					$ 7,500
Floor rate	[8],[9],[12],[16],[21],[22]					1.00%	1.00%
Variable rate	[8],[9],[16],[21],[22]					9.00%	9.00%
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 1
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 20,968
Floor rate	[2],[3],[6],[14]			1.00%	1.00%
Variable rate	[2],[3],[6],[14]			6.75%	6.75%
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 2
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[23]			$ 2,688
Floor rate	[2],[3],[6],[23]			1.00%	1.00%
Variable rate	[2],[3],[6],[23]			6.75%	6.75%
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 3
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[23]			$ 1,344
Floor rate	[2],[3],[6],[23]			1.00%	1.00%
Variable rate	[2],[3],[6],[23]			6.75%	6.75%
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 36,000
Floor rate	[2],[3],[6],[14]			1.00%	1.00%
Variable rate	[2],[3],[6],[14]			7.65%	7.65%
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					$ 39,000
Floor rate	[8],[9],[12],[16]					1.00%	1.00%
Variable rate	[8],[9],[16]					7.65%	7.65%
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 31,575
Floor rate	[9],[12]					1.00%	1.00%
Variable rate	[9]					4.25%	4.25%
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[24],[25]			$ 100,000
Variable rate	[2],[3],[6],[24],[25]			8.50%	8.50%
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[26],[27]					$ 100,000
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 26,882
Variable rate	[9]					5.25%	5.25%
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					$ 37,000
Floor rate	[8],[9],[12],[16]					0.80%	0.80%
Variable rate	[8],[9],[16]					6.25%	6.25%
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[11]					$ 11,400
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[16]					24,299
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 9,975
Floor rate	[3],[6],[14],[15]			0.80%	0.80%
Variable rate	[3],[6],[14],[15]			3.50%	3.50%
Investment, Identifier [Axis]: FR BR Holdings LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 80,582
Variable rate	[2],[3],[6]			6.50%	6.50%
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					$ 81,582
Variable rate	[8],[9],[16]					6.50%	6.50%
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 17,122
Floor rate	[2],[3],[6],[14]			0.50%	0.50%
Variable rate	[2],[3],[6],[14]			7.50%	7.50%
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					$ 17,347
Floor rate	[8],[9],[12]					0.50%	0.50%
Variable rate	[8],[9]					7.50%	7.50%
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 9,957
Floor rate	[3],[6],[14],[15]			1.00%	1.00%
Variable rate	[3],[6],[14],[15]			50000.00%	50000.00%
Investment, Identifier [Axis]: GIP II Blue Holding LP, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 3,137
Floor rate	[3],[6],[14]			1.00%	1.00%
Variable rate	[3],[6],[14]			4.50%	4.50%
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 5,918
Floor rate	[9],[12]					1.00%	1.00%
Variable rate	[9]					4.50%	4.50%
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[5]			$ 13,951
Variable rate				7.80%	7.80%
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[11]					$ 14,648
Variable rate	[8],[9],[11]					7.75%	7.75%
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 7,432
Floor rate	[9],[12]					0.80%	0.80%
Variable rate	[9]					5.00%	5.00%
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 163
Floor rate	[9],[12]					0.80%	0.80%
Variable rate	[9]					5.00%	5.00%
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 14,703
Floor rate	[2],[3],[6],[14]			0.50%	0.50%
Variable rate	[2],[3],[6],[14]			7.00%	7.00%
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					$ 14,963
Floor rate	[8],[9],[12]					0.50%	0.50%
Variable rate	[8],[9]					7.25%	7.25%
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 9,975
Floor rate	[3],[6],[14]			0.50%	0.50%
Variable rate	[3],[6],[14]			4.00%	4.00%
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 15,000
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					$ 30,391
Investment, Identifier [Axis]: Hammerhead Resources Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[5]			39,458
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[11],[16]					$ 35,118
Variable rate	[8],[9],[11],[16]					12.00%	12.00%
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 21,000
Variable rate	[3],[6],[14]			5.00%	5.00%
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, LP, Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 14,944
Floor rate	[3],[6],[14],[15]			0.80%	0.80%
Variable rate	[3],[6],[14],[15]			4.00%	4.00%
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 7,920
Floor rate	[9],[12]					0.80%	0.80%
Variable rate	[9]					3.75%	3.75%
Investment, Identifier [Axis]: Meritage Midstream Services II, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 21,759
Floor rate	[2],[3],[6]			1.00%	1.00%
Variable rate	[2],[3],[6]			6.75%	6.75%
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[3]			$ 11,693
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[16]					$ 11,693
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Schedule of Investments [Line Items]
Principal amount	[7],[9],[11]					19,125
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Schedule of Investments [Line Items]
Principal amount	[1],[3],[5],[14],[15]			10,000
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 20,000
Floor rate	[2],[3],[6]			1.50%	1.50%
Variable rate	[2],[3],[6]			9.00%	9.00%
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					$ 18,659
Floor rate	[8],[9],[12]					1.00%	1.00%
Variable rate	[8],[9]					5.25%	5.25%
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[13]					$ 11,341
Floor rate	[8],[9],[12],[13]					1.00%	1.00%
Variable rate	[8],[9],[13]					5.25%	5.25%
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[16]					$ 32,357
Floor rate	[9],[12],[16]					0.50%	0.50%
Variable rate	[9],[16]					3.25%	3.25%
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 1
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 5,760
Floor rate	[3],[6],[14]			0.80%	0.80%
Variable rate	[3],[6],[14]			4.75%	4.75%
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 2
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 43,579
Floor rate	[3],[6],[14]			0.80%	0.80%
Variable rate	[3],[6],[14]			4.75%	4.75%
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 5,760
Floor rate	[9],[12]					0.80%	0.80%
Variable rate	[9]					4.75%	4.75%
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 43,910
Floor rate	[9],[12]					0.80%	0.80%
Variable rate	[9]					4.75%	4.75%
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					$ 13,545
Floor rate	[8],[9],[12],[16]					1.50%	1.50%
Variable rate	[8],[9],[16]					6.75%	6.75%
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[13]					$ 1,505
Floor rate	[8],[9],[12],[13]					1.50%	1.50%
Variable rate	[8],[9],[13]					6.75%	6.75%
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[28]			$ 4,840
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16],[29]					$ 4,767
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount	[7],[9]					26,365
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount	[7],[9],[16]					5,200
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 9,974
Variable rate	[3],[6],[14],[15]			3.50%	3.50%
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 9,370
Floor rate	[2],[3],[6],[14]			1.00%	1.00%
Variable rate	[2],[3],[6],[14]			6.75%	6.75%
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					$ 9,370
Floor rate	[8],[9],[12]					1.00%	1.00%
Variable rate	[8],[9]					6.75%	6.75%
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[13]					$ 2,477
Floor rate	[8],[9],[12],[13]					1.00%	1.00%
Variable rate	[8],[9],[13]					6.75%	6.75%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[18],[19]			$ 13,297
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[18],[19]			4,015
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[23]			2,709
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[13]					$ 2,709
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					12,121
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					3,643
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 57,869
Floor rate	[2],[3],[6],[14]			0.50%	0.50%
Variable rate	[2],[3],[6],[14]			6.00%	6.00%
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					$ 58,459
Floor rate	[8],[9],[12]					0.50%	0.50%
Variable rate	[8],[9]					6.00%	6.00%
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14],[15]			$ 9,975
Floor rate	[3],[6],[14],[15]			1.00%	1.00%
Variable rate	[3],[6],[14],[15]			4.00%	4.00%
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[11]					$ 29,772
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 9,975
Floor rate	[3],[6],[14]			0.50%	0.50%
Variable rate	[3],[6],[14]			3.50%	3.50%
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 10,419
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					10,526
Investment, Identifier [Axis]: SilverBow Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[5]			$ 14,250
Floor rate	[2],[3],[5],[6]			1.00%	1.00%
Variable rate	[2],[3],[5],[6]			7.50%	7.50%
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[11],[16]					$ 14,250
Floor rate	[8],[9],[11],[12],[16]					1.00%	1.00%
Variable rate	[8],[9],[11],[16]					7.50%	7.50%
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[5],[14]			$ 18,000
Floor rate	[2],[3],[5],[6],[14]			1.50%	1.50%
Variable rate	[2],[3],[5],[6],[14]			5.75%	5.75%
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[11],[16]					$ 19,500
Floor rate	[8],[9],[11],[12],[16]					1.50%	1.50%
Variable rate	[8],[9],[11],[16]					6.50%	6.50%
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[11],[16]					$ 7,590
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[5],[18],[20]			$ 60,603
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[8],[9],[17],[30]					60,603
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 10,240
Floor rate	[3],[6],[14]			1.00%	1.00%
Variable rate	[3],[6],[14]			5.50%	5.50%
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9],[16]					19,761
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 20,537
Floor rate	[2],[3],[6],[14]			1.00%	1.00%
Variable rate	[2],[3],[6],[14]			7.50%	7.50%
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[16]					$ 20,537
Floor rate	[8],[9],[12],[16]					1.00%	1.00%
Variable rate	[8],[9],[16]					7.50%	7.50%
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[7],[9]					$ 28,436
Floor rate	[9],[12]					1.00%	1.00%
Variable rate	[9]					4.25%	4.25%
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Schedule of Investments [Line Items]
Principal amount	[1],[3],[14]			$ 9,962
Floor rate	[3],[6],[14]			0.80%	0.80%
Variable rate	[3],[6],[14]			4.00%	4.00%
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14],[20]			$ 23,763
Floor rate	[2],[3],[6],[14],[20]			1.00%	1.00%
Variable rate	[2],[3],[6],[14],[20]			9.00%	9.00%
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9],[17]					$ 23,584
Floor rate	[8],[9],[12],[17]					1.00%	1.00%
Variable rate	[8],[9],[17]					9.00%	9.00%
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[14]			$ 42,938
Floor rate	[2],[3],[6],[14]			1.80%	1.80%
Variable rate	[2],[3],[6],[14]			9.85%	9.85%
Investment, Identifier [Axis]: Wattbridge Inc., Power
Schedule of Investments [Line Items]
Principal amount	[7],[8],[9]					$ 42,500
Floor rate	[8],[9],[12]					1.80%	1.80%
Variable rate	[8],[9]					7.85%	7.85%
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Aggregate sustainable infrastructure investments		$ 67,629	$ 5,430
Contributed capital to committed capital ratio		87.50%	87.50%
Percentage of voting control		50.00%	50.00%
Amount funded to joint venture				$ 62,300
Principal amount				192,881		$ 274,088
Debt				195,734		213,583
Sustainable Infrastructure Investments, LLC | Imperial
Schedule of Investments [Line Items]
Contributed capital to committed capital ratio		12.50%	12.50%
Percentage of voting control		50.00%	50.00%
Sustainable Infrastructure Investments, LLC | FS Energy And Power Fund
Schedule of Investments [Line Items]
Sustainable infrastructure investments, LLC entitled to a fee percentage		0.25%	0.25%
Amount funded to joint venture				54,514
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Alianca Transportadora de Gas Participacoes S.A., Midstream
Schedule of Investments [Line Items]
Principal amount						$ 73,707
Variable rate						2.60%	2.60%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Blue Heron Intermediate Holdco I, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount				$ 30,958		$ 31,832
Variable rate				1.88%	1.88%	1.88%	1.88%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Cedar Creek II LLC, Renewables
Schedule of Investments [Line Items]
Principal amount				$ 8,160		$ 8,710
Variable rate				1.88%	1.88%	1.88%	1.88%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Copper Mountain Solar 3, LLC, Renewables
Schedule of Investments [Line Items]
Principal amount				$ 17,105		$ 17,804
Variable rate				1.88%	1.88%	1.75%	1.75%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: FLNG Liquefaction 2, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount				$ 26,972		$ 28,170
Variable rate				1.50%	1.50%	1.50%	1.50%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Largest Portfolio Company Investment
Schedule of Investments [Line Items]
Principal amount				$ 57,784		$ 73,707
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Meikle Wind Energy, LP, Renewables
Schedule of Investments [Line Items]
Principal amount					$ 15,431		$ 16,030
Variable rate				1.50%	1.50%	1.50%	1.50%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: NES Hercules Class B Member, LLC, Renewables
Schedule of Investments [Line Items]
Principal amount				$ 24,176		$ 24,487
Variable rate				1.63%	1.63%	1.50%	1.50%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: ST EIP Holdco LLC, Midstream
Schedule of Investments [Line Items]
Principal amount				$ 57,784		$ 58,673
Variable rate				2.50%	2.50%	2.50%	2.50%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Seine Funding, LLC
Schedule of Investments [Line Items]
Principal amount		$ 634,103
Floor rate		0.00%
Variable rate		1.20%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Top of the World Wind Energy LLC, Renewables
Schedule of Investments [Line Items]
Principal amount				$ 15,854		$ 18,373
Variable rate				2.13%	2.13%	1.88%	1.88%
Senior Secured Loan
Schedule of Investments [Line Items]
Number of senior secured loan investments | investment				3	3	6	6
Unfunded commitment with amortized cost				$ 6,741		$ 25,891
Partnership Interest | Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Unfunded commitment with amortized cost				$ 7,625	$ 858	$ 7,625	$ 858
Non-Controlled/Affiliated
Schedule of Investments [Line Items]
Number of investments in portfolio companies | company				4	4	6	6
Controlled/affiliated
Schedule of Investments [Line Items]
Number of investments in portfolio companies | company				3	3	3	3

[1] Denominated in U.S. dollars, unless otherwise noted.

[2] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[5] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of September 30, 2023, 76.5% of the Company’s total assets represented qualifying assets.

[6] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023, the Secured Overnight Financing Rate, or SOFR, or S, was 5.40% and the Overnight Bank Funding Rate, or OBFR, was 5.32%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

[7] Denominated in U.S. dollars, unless otherwise noted.

[8] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[9] Security may be an obligation of one or more entities affiliated with the named company.

[10] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[11] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.

[12] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2022, the three-month London Interbank Offered Rate, or LIBOR, or L, was 4.77% and the Secured Overnight Financing Rate, or SOFR, or S, was 4.59%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

[13] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[14] Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).

[15] Security or portion thereof unsettled as of September 30, 2023.

[16] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).

[17] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Dividend Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC(4) $7,782 $654 $— $— $— $8,436 $— $654 $— Allied Wireline Services, LLC46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC22,745 455 (23,200)— — — — 455 — Warren Resources, Inc.23,688 237 (341)— — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC50,770 — — — 328 51,098 — — 735 Equity/OtherAllied Wireline Services, LLC, Common Equity— — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants— — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units4,181 — (18,060)15,899 (2,020)— — — — Warren Resources, Inc., Common Equity25,854 — — — 11,128 36,982 — — — $181,359 $7,154 $(41,601)$15,899 $31,640 $194,451 $2,936 $7,154 $735  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK and dividend income presented for the year ended December 31, 2022. (4)    Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[18] Security is non-income producing.

[19] Security was on non-accrual status as of September 30, 2023.

[20] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $8,436 $138 $(8,574)$— $— $— $256 $139 Allied Wireline Services, LLC63,888 6,389 — — (33,101)37,176 2,910 — Warren Resources, Inc.23,584 23,882 (23,703)— — 23,763 2,521 179 Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC51,098 — — — (1,906)49,192 — — Equity/OtherAllied Wireline Services, LLC, Common Equity10,463 — — — (10,463)— — — Allied Wireline Services, LLC, Warrants— — — — — — — — Warren Resources, Inc., Common Equity36,982 — — — (18,789)18,193 — — $194,451 $30,409 $(32,277)$— $(64,259)$128,324 $5,687 $318  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[21] Security is non-income producing.

[22] Security was on non-accrual status as of December 31, 2022.

[23] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[24] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[25] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[26] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[27] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[28] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First LienPermian Production Holdings, LLC$4,767 $171 $— $— $(98)$4,840 $398 $73 Equity/OtherGWP Midstream Holdco, LLC, Common Equity5,044 — — — (3,631)1,413 — — Harvest Oil & Gas Corp., Common Equity810 — (641)— 506 675 — — Limetree Bay Energy, LLC, Class A Units1,885 246 — (21,704)19,573 — — — Permian Production Holdings, LLC, Common Equity11,420 — — — (5,317)6,103 — — Ridgeback Resources Inc., Common Equity41,851 — (35,240)(11,359)4,748 — — — Telpico, LLC, Common Equity— — — — — — — — $65,777 $417 $(35,881)$(33,063)$15,781 $13,031 $398 $73  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[29] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Senior Secured Loans—First LienLimetree Bay Energy, LLC$3,166 $— $(1,587)$(12,756)$11,177 $— $— $— $— $— Permian Production Holdings, LLC7,889 697 (3,674)551 (696)4,767 570 105 — — Senior Secured BondsGreat Western Petroleum, LLC58,055 96 (55,096)1,087 (4,142)— 2,649 — 7,268 — Equity/OtherGreat Western Petroleum, LLC, Common Equity40,731 — (84,871)54,081 (9,941)— — — — — GWP Midstream Holdco, LLC, Common Equity— 6,681 — — (1,637)5,044 — — — — Harvest Oil & Gas Corp., Common Equity2,836 — (743)— (1,283)810 — — — — Limetree Bay Energy, LLC, Class A Units6,046 1,795 — — (5,956)1,885 — — — — Permian Production Holdings, LLC, Common Equity8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity48,356 — (12,559)173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity— — — — — — — — — — $175,908 $9,273 $(158,530)$43,136 $(4,010)$65,777 $3,219 $105 $7,268 $5,417  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

[30] Includes the effect of swap contracts.

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Investment Portfolio - Investment Portfolio, at Fair Value and Percentage (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023		Dec. 31, 2022
Schedule of Investments [Line Items]
Investments, at fair value	$ 1,492,766	[1],[2]	$ 2,047,115	[3],[4]
Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	100.00%		100.00%
Energy—Upstream
Schedule of Investments [Line Items]
Investments, at fair value	$ 533,790		$ 854,974
Energy—Upstream | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	36.00%		42.00%
Energy—Midstream
Schedule of Investments [Line Items]
Investments, at fair value	$ 423,991		$ 646,488
Energy—Midstream | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	28.00%		32.00%
Energy—Power
Schedule of Investments [Line Items]
Investments, at fair value	$ 194,940		$ 386,007
Energy—Power | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	13.00%		19.00%
Consumer Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 51,022		$ 0
Consumer Services | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	3.00%		0.00%
Energy—Service & Equipment
Schedule of Investments [Line Items]
Investments, at fair value	$ 49,724		$ 96,040
Energy—Service & Equipment | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	3.00%		5.00%
Capital Goods
Schedule of Investments [Line Items]
Investments, at fair value	$ 29,821		$ 0
Capital Goods | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	2.00%		0.00%
Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Investments, at fair value	$ 27,975		$ 0
Consumer Discretionary Distribution & Retail | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	2.00%		0.00%
Commercial & Professional Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 22,062		$ 12,508
Commercial & Professional Services | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	2.00%		0.00%
Household & Personal Products
Schedule of Investments [Line Items]
Investments, at fair value	$ 20,297		$ 0
Household & Personal Products | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Financial Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 19,939		$ 0
Financial Services | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Investments, at fair value	$ 19,400		$ 0
Pharmaceuticals, Biotechnology & Life Sciences | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Insurance
Schedule of Investments [Line Items]
Investments, at fair value	$ 11,275		$ 0
Insurance | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Transportation
Schedule of Investments [Line Items]
Investments, at fair value	$ 9,851		$ 0
Transportation | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Automobiles & Components
Schedule of Investments [Line Items]
Investments, at fair value	$ 9,849		$ 0
Automobiles & Components | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Investments, at fair value	$ 9,844		$ 0
Consumer Staples Distribution & Retail | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Health Care Equipment & Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 9,794		$ 0
Health Care Equipment & Services | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1.00%		0.00%
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Investments, at fair value	$ 49,192		$ 51,098
Sustainable Infrastructure Investments, LLC | Percentage of Portfolio | Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	3.00%		2.00%

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

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Investment Portfolio - Individual Loans in SIIJV’s portfolio (Details) $ in Thousands, $ in Thousands	Sep. 30, 2023 USD ($) portfolio_asset		Sep. 30, 2023 CAD ($) portfolio_asset		Dec. 31, 2022 USD ($) portfolio_asset		Dec. 31, 2022 CAD ($) portfolio_asset		Jan. 02, 2020 USD ($)
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Schedule of Investments [Line Items]
Principal amount	$ 22,970	[1],[2],[3],[4],[5]
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Schedule of Investments [Line Items]
Principal amount					$ 22,734	[6],[7],[8],[9],[10]
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Schedule of Investments [Line Items]
Principal amount					5,359	[6],[7],[8],[9],[10],[11]
Investment, Identifier [Axis]: Acrisure LLC, Insurance
Schedule of Investments [Line Items]
Principal amount	11,191	[1],[3],[12],[13]
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Schedule of Investments [Line Items]
Principal amount					20,000	[6],[7],[8],[14]
Investment, Identifier [Axis]: Aethon United BR LP, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	$ 40,500	[1],[3]
Weighted average current interest rate on debt investments	8.30%	[3],[15]	8.30%	[3],[15]
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Schedule of Investments [Line Items]
Principal amount					$ 40,500	[6],[8],[14]
Weighted average current interest rate on debt investments					8.30%	[8],[14]	8.30%	[8],[14]
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Schedule of Investments [Line Items]
Principal amount					$ 8,436	[6],[7],[8],[14],[16]
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Schedule of Investments [Line Items]
Principal amount					2,500	[6],[7],[8],[11],[16]
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Schedule of Investments [Line Items]
Principal amount	$ 5,500	[1],[3],[12],[13]
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Schedule of Investments [Line Items]
Principal amount	9,954	[1],[3],[12]
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Schedule of Investments [Line Items]
Principal amount	70,277	[1],[2],[3],[12],[17],[18],[19]
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Schedule of Investments [Line Items]
Principal amount					63,888	[6],[7],[8],[14],[16]
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Schedule of Investments [Line Items]
Principal amount					$ 3,098	[6],[8],[10],[14]
Weighted average current interest rate on debt investments					6.30%	[8],[10],[14]	6.30%	[8],[10],[14]
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	9,949	[1],[3],[12]
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	14,975	[1],[3],[12],[13]
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Schedule of Investments [Line Items]
Principal amount					$ 39,259	[6],[8]
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	997	[1],[3]
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Schedule of Investments [Line Items]
Principal amount					14,286	[6],[8]
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	23,172	[1],[3],[12]
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Schedule of Investments [Line Items]
Principal amount					23,601	[6],[8]
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Schedule of Investments [Line Items]
Principal amount					7,500	[6],[7],[8],[14],[20],[21]
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 1
Schedule of Investments [Line Items]
Principal amount	20,968	[1],[2],[3],[12]
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 2
Schedule of Investments [Line Items]
Principal amount	2,688	[1],[2],[3],[22]
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 3
Schedule of Investments [Line Items]
Principal amount	1,344	[1],[2],[3],[22]
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	36,000	[1],[2],[3],[12]
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount					39,000	[6],[7],[8],[14]
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Schedule of Investments [Line Items]
Principal amount					31,575	[6],[8]
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	100,000	[1],[2],[3],[23],[24]
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Schedule of Investments [Line Items]
Principal amount					$ 100,000	[6],[7],[8],[25],[26]
Weighted average current interest rate on debt investments					12.90%	[7],[8],[25],[26]	12.90%	[7],[8],[25],[26]
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount					$ 26,882	[6],[8]
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount					37,000	[6],[7],[8],[14]
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount					$ 11,400	[6],[8],[10]
Weighted average current interest rate on debt investments					8.00%	[8],[10]	8.00%	[8],[10]
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Schedule of Investments [Line Items]
Principal amount					$ 24,299	[6],[8],[14]
Weighted average current interest rate on debt investments					5.80%	[8],[14]	5.80%	[8],[14]
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	9,975	[1],[3],[12],[13]
Investment, Identifier [Axis]: FR BR Holdings LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	80,582	[1],[2],[3]
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Schedule of Investments [Line Items]
Principal amount					$ 81,582	[6],[7],[8],[14]
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	17,122	[1],[2],[3],[12]
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount					17,347	[6],[7],[8]
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Schedule of Investments [Line Items]
Principal amount	9,957	[1],[3],[12],[13]
Investment, Identifier [Axis]: GIP II Blue Holding LP, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	3,137	[1],[3],[12]
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Schedule of Investments [Line Items]
Principal amount					5,918	[6],[8]
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	13,951	[1],[2],[3],[5]
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Schedule of Investments [Line Items]
Principal amount					14,648	[6],[7],[8],[10]
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Schedule of Investments [Line Items]
Principal amount					7,432	[6],[8]
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Schedule of Investments [Line Items]
Principal amount					163	[6],[8]
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	14,703	[1],[2],[3],[12]
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount					14,963	[6],[7],[8]
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Schedule of Investments [Line Items]
Principal amount	9,975	[1],[3],[12]
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	$ 15,000	[1],[3],[12],[13]
Weighted average current interest rate on debt investments	8.50%	[3],[12],[13],[15]	8.50%	[3],[12],[13],[15]
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Schedule of Investments [Line Items]
Principal amount					30,391	[6],[7],[8]
Investment, Identifier [Axis]: Hammerhead Resources Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	$ 39,458	[1],[2],[3],[5]
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Schedule of Investments [Line Items]
Principal amount					35,118	[6],[7],[8],[10],[14]
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Schedule of Investments [Line Items]
Principal amount	21,000	[1],[3],[12]
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, LP, Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	14,944	[1],[3],[12],[13]
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Schedule of Investments [Line Items]
Principal amount					7,920	[6],[8]
Investment, Identifier [Axis]: Meritage Midstream Services II, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	21,759	[1],[2],[3]
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	$ 11,693	[1],[3]
Weighted average current interest rate on debt investments	7.50%	[3],[15]	7.50%	[3],[15]
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount					$ 11,693	[6],[8],[14]
Weighted average current interest rate on debt investments					7.50%	[8],[14]	7.50%	[8],[14]
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments	14.20%	[2],[3],[5],[12],[15],[17],[18]	14.20%	[2],[3],[5],[12],[15],[17],[18]
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments					14.20%	[7],[8],[10],[14],[20],[21]	14.20%	[7],[8],[10],[14],[20],[21]
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Schedule of Investments [Line Items]
Principal amount					$ 19,125	[6],[8],[10]
Weighted average current interest rate on debt investments					3.90%	[8],[10]	3.90%	[8],[10]
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Schedule of Investments [Line Items]
Principal amount	$ 10,000	[1],[3],[5],[12],[13]
Weighted average current interest rate on debt investments	10.80%	[3],[5],[12],[13],[15]	10.80%	[3],[5],[12],[13],[15]
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Principal amount	$ 20,000	[1],[2],[3]
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments					12.80%	[7],[8],[10],[14]	12.80%	[7],[8],[10],[14]
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Schedule of Investments [Line Items]
Principal amount					$ 18,659	[6],[7],[8]
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Schedule of Investments [Line Items]
Principal amount					11,341	[6],[7],[8],[11]
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Schedule of Investments [Line Items]
Principal amount					32,357	[6],[8],[14]
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 1
Schedule of Investments [Line Items]
Principal amount	5,760	[1],[3],[12]
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 2
Schedule of Investments [Line Items]
Principal amount	43,579	[1],[3],[12]
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Schedule of Investments [Line Items]
Principal amount					5,760	[6],[8]
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Schedule of Investments [Line Items]
Principal amount					43,910	[6],[8]
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount					13,545	[6],[7],[8],[14]
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount					1,505	[6],[7],[8],[11]
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	$ 4,840	[1],[2],[3],[27]
Weighted average current interest rate on debt investments	7.00%	[2],[3],[15],[27]	7.00%	[2],[3],[15],[27]
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount					$ 4,767	[6],[7],[8],[14],[28]
Weighted average current interest rate on debt investments					7.00%	[7],[8],[14],[28]	7.00%	[7],[8],[14],[28]
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount					$ 26,365	[6],[8]
Weighted average current interest rate on debt investments					7.80%	[8]	7.80%	[8]
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount					$ 5,200	[6],[8],[14]
Weighted average current interest rate on debt investments					5.90%	[8],[14]	5.90%	[8],[14]
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Schedule of Investments [Line Items]
Principal amount	$ 9,974	[1],[3],[12],[13]
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	9,370	[1],[2],[3],[12]
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Schedule of Investments [Line Items]
Principal amount					$ 9,370	[6],[7],[8]
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Schedule of Investments [Line Items]
Principal amount					2,477	[6],[7],[8],[11]
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Schedule of Investments [Line Items]
Principal amount	$ 13,297	[1],[2],[3],[17],[18]
Weighted average current interest rate on debt investments	6.00%	[2],[3],[15],[17],[18]	6.00%	[2],[3],[15],[17],[18]
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Schedule of Investments [Line Items]
Principal amount	$ 4,015	[1],[2],[3],[17],[18]
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Schedule of Investments [Line Items]
Principal amount	$ 2,709	[1],[2],[3],[22]
Weighted average current interest rate on debt investments	10.00%	[2],[3],[15],[22]	10.00%	[2],[3],[15],[22]
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Schedule of Investments [Line Items]
Principal amount					$ 2,709	[6],[7],[8],[11]
Weighted average current interest rate on debt investments					10.00%	[7],[8],[11]	10.00%	[7],[8],[11]
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Schedule of Investments [Line Items]
Principal amount					$ 12,121	[6],[7],[8],[14]
Weighted average current interest rate on debt investments					6.00%	[7],[8],[14]	6.00%	[7],[8],[14]
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Schedule of Investments [Line Items]
Principal amount					$ 3,643	[6],[7],[8],[14]
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	$ 57,869	[1],[2],[3],[12]
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Schedule of Investments [Line Items]
Principal amount					58,459	[6],[7],[8]
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	9,975	[1],[3],[12],[13]
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Schedule of Investments [Line Items]
Principal amount					$ 29,772	[6],[8],[10]
Weighted average current interest rate on debt investments					9.30%	[8],[10]	9.30%	[8],[10]
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	9,975	[1],[3],[12]
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	$ 10,419	[1],[2],[3],[12]
Weighted average current interest rate on debt investments	6.30%	[2],[3],[12],[15]	6.30%	[2],[3],[12],[15]
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Schedule of Investments [Line Items]
Principal amount					$ 10,526	[6],[7],[8]
Weighted average current interest rate on debt investments					6.30%	[7],[8]	6.30%	[7],[8]
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments					13.10%	[7],[8],[14],[20],[21],[29]	13.10%	[7],[8],[14],[20],[21],[29]
Investment, Identifier [Axis]: SilverBow Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	$ 14,250	[1],[2],[3],[5]
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Schedule of Investments [Line Items]
Principal amount					$ 14,250	[6],[7],[8],[10],[14]
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	18,000	[1],[2],[3],[5],[12]
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Schedule of Investments [Line Items]
Principal amount					19,500	[6],[7],[8],[10],[14]
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Schedule of Investments [Line Items]
Principal amount					$ 7,590	[6],[8],[10],[14]
Weighted average current interest rate on debt investments					5.00%	[8],[10],[14]	5.00%	[8],[10],[14]
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	60,603	[1],[2],[3],[5],[17],[19]
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Schedule of Investments [Line Items]
Principal amount					$ 60,603	[7],[8],[16],[30]
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	10,240	[1],[3],[12]
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Schedule of Investments [Line Items]
Principal amount					$ 19,761	[6],[8],[14]
Weighted average current interest rate on debt investments					6.00%	[8],[14]	6.00%	[8],[14]
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	20,537	[1],[2],[3],[12]
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount					$ 20,537	[6],[7],[8],[14]
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Schedule of Investments [Line Items]
Principal amount					$ 28,436	[6],[8]
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Schedule of Investments [Line Items]
Principal amount	$ 9,962	[1],[3],[12]
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments	9.80%	[2],[3],[5],[12],[15]	9.80%	[2],[3],[5],[12],[15]
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments					9.80%	[7],[8]	9.80%	[7],[8]
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	$ 23,763	[1],[2],[3],[12],[19]
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Schedule of Investments [Line Items]
Principal amount					$ 23,584	[6],[7],[8],[16]
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Schedule of Investments [Line Items]
Principal amount	42,938	[1],[2],[3],[12]
Investment, Identifier [Axis]: Wattbridge Inc., Power
Schedule of Investments [Line Items]
Principal amount					42,500	[6],[7],[8]
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Principal amount	$ 192,881				$ 274,088
Number of portfolio assets in SIIJV | portfolio_asset	8		8		9		9
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Alianca Transportadora de Gas Participacoes S.A., Midstream
Schedule of Investments [Line Items]
Principal amount					$ 73,707
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Blue Heron Intermediate Holdco I, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	$ 30,958				31,832
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Cedar Creek II LLC, Renewables
Schedule of Investments [Line Items]
Principal amount	8,160				8,710
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Copper Mountain Solar 3, LLC, Renewables
Schedule of Investments [Line Items]
Principal amount	17,105				17,804
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: FLNG Liquefaction 2, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	26,972				28,170
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Largest Portfolio Company Investment
Schedule of Investments [Line Items]
Principal amount	57,784				73,707
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Meikle Wind Energy, LP, Renewables
Schedule of Investments [Line Items]
Principal amount			$ 15,431				$ 16,030
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: NES Hercules Class B Member, LLC, Renewables
Schedule of Investments [Line Items]
Principal amount	24,176				24,487
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: ST EIP Holdco LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	57,784				58,673
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Seine Funding, LLC
Schedule of Investments [Line Items]
Principal amount									$ 634,103
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Top of the World Wind Energy LLC, Renewables
Schedule of Investments [Line Items]
Principal amount	$ 15,854				$ 18,373
Sustainable Infrastructure Investments, LLC | Weighted Average
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments	7.35%		7.35%		6.96%		6.96%

[1] Denominated in U.S. dollars, unless otherwise noted.

[2] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[5] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of September 30, 2023, 76.5% of the Company’s total assets represented qualifying assets.

[6] Denominated in U.S. dollars, unless otherwise noted.

[7] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[8] Security may be an obligation of one or more entities affiliated with the named company.

[9] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[10] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.

[11] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[12] Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).

[13] Security or portion thereof unsettled as of September 30, 2023.

[14] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).

[15] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023, the Secured Overnight Financing Rate, or SOFR, or S, was 5.40% and the Overnight Bank Funding Rate, or OBFR, was 5.32%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

[16] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Dividend Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC(4) $7,782 $654 $— $— $— $8,436 $— $654 $— Allied Wireline Services, LLC46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC22,745 455 (23,200)— — — — 455 — Warren Resources, Inc.23,688 237 (341)— — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC50,770 — — — 328 51,098 — — 735 Equity/OtherAllied Wireline Services, LLC, Common Equity— — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants— — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units4,181 — (18,060)15,899 (2,020)— — — — Warren Resources, Inc., Common Equity25,854 — — — 11,128 36,982 — — — $181,359 $7,154 $(41,601)$15,899 $31,640 $194,451 $2,936 $7,154 $735  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK and dividend income presented for the year ended December 31, 2022. (4)    Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[17] Security is non-income producing.

[18] Security was on non-accrual status as of September 30, 2023.

[19] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $8,436 $138 $(8,574)$— $— $— $256 $139 Allied Wireline Services, LLC63,888 6,389 — — (33,101)37,176 2,910 — Warren Resources, Inc.23,584 23,882 (23,703)— — 23,763 2,521 179 Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC51,098 — — — (1,906)49,192 — — Equity/OtherAllied Wireline Services, LLC, Common Equity10,463 — — — (10,463)— — — Allied Wireline Services, LLC, Warrants— — — — — — — — Warren Resources, Inc., Common Equity36,982 — — — (18,789)18,193 — — $194,451 $30,409 $(32,277)$— $(64,259)$128,324 $5,687 $318  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[20] Security is non-income producing.

[21] Security was on non-accrual status as of December 31, 2022.

[22] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[23] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[24] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[25] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[26] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[27] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First LienPermian Production Holdings, LLC$4,767 $171 $— $— $(98)$4,840 $398 $73 Equity/OtherGWP Midstream Holdco, LLC, Common Equity5,044 — — — (3,631)1,413 — — Harvest Oil & Gas Corp., Common Equity810 — (641)— 506 675 — — Limetree Bay Energy, LLC, Class A Units1,885 246 — (21,704)19,573 — — — Permian Production Holdings, LLC, Common Equity11,420 — — — (5,317)6,103 — — Ridgeback Resources Inc., Common Equity41,851 — (35,240)(11,359)4,748 — — — Telpico, LLC, Common Equity— — — — — — — — $65,777 $417 $(35,881)$(33,063)$15,781 $13,031 $398 $73  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[28] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Senior Secured Loans—First LienLimetree Bay Energy, LLC$3,166 $— $(1,587)$(12,756)$11,177 $— $— $— $— $— Permian Production Holdings, LLC7,889 697 (3,674)551 (696)4,767 570 105 — — Senior Secured BondsGreat Western Petroleum, LLC58,055 96 (55,096)1,087 (4,142)— 2,649 — 7,268 — Equity/OtherGreat Western Petroleum, LLC, Common Equity40,731 — (84,871)54,081 (9,941)— — — — — GWP Midstream Holdco, LLC, Common Equity— 6,681 — — (1,637)5,044 — — — — Harvest Oil & Gas Corp., Common Equity2,836 — (743)— (1,283)810 — — — — Limetree Bay Energy, LLC, Class A Units6,046 1,795 — — (5,956)1,885 — — — — Permian Production Holdings, LLC, Common Equity8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity48,356 — (12,559)173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity— — — — — — — — — — $175,908 $9,273 $(158,530)$43,136 $(4,010)$65,777 $3,219 $105 $7,268 $5,417  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

[29] Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

[30] Includes the effect of swap contracts.

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Investment Portfolio - Sustainable Infrastructure Investments, LLC Portfolio (Details) $ in Thousands, $ in Thousands		Sep. 30, 2023 USD ($)		Sep. 30, 2023 CAD ($)		Dec. 31, 2022 USD ($)		Dec. 31, 2022 CAD ($)		Dec. 31, 2021 USD ($)		Jan. 02, 2020 USD ($)
Schedule of Investments [Line Items]
Amortized Cost		$ 1,453,082	[1]			$ 1,922,940	[2]
Investments, at fair value		$ 1,492,766	[1],[3]			$ 2,047,115	[2],[4]
Percent of net assets		90.10%	[1]	90.10%	[1]	116.70%	[2]	116.70%	[2]
London Interbank Offered Rate (LIBOR)
Schedule of Investments [Line Items]
Investment, variable rate						4.77%		4.77%
Secured Overnight Financing Rate
Schedule of Investments [Line Items]
Investment, variable rate		5.40%		5.40%		4.59%		4.59%
Net Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Amortized Cost		$ 675,016	[1]			$ 702,842	[2]
Investments, at fair value		$ 631,307	[1],[3]			$ 706,646	[2],[4]
Percent of net assets		38.10%	[1]	38.10%	[1]	40.30%	[2]	40.30%	[2]
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[7],[8]	4.00%		4.00%
Principal amount	[1],[6],[7],[8],[9]	$ 22,970
Amortized Cost	[1],[6],[7],[8]	20,881
Investments, at fair value	[1],[3],[6],[7],[8]	22,878
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Schedule of Investments [Line Items]
Variable rate	[2],[10],[11],[12]					4.00%		4.00%
Principal amount	[2],[10],[11],[12],[13]					$ 22,734
Amortized Cost	[2],[10],[11],[12]					20,082
Investments, at fair value	[2],[4],[10],[11],[12]					$ 23,519
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Schedule of Investments [Line Items]
Variable rate	[2],[10],[11],[12],[14]					4.00%		4.00%
Principal amount	[2],[10],[11],[12],[13],[14]					$ 5,359
Amortized Cost	[2],[10],[11],[12],[14]					5,359
Investments, at fair value	[2],[4],[10],[11],[12],[14]					5,545
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Energy—Power
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[7],[8],[15]	2,652
Investments, at fair value	[1],[3],[6],[7],[8],[15]	187
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Power
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[11],[12],[16],[17]					2,652
Investments, at fair value	[2],[4],[10],[11],[12],[16],[17]					1,630
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15]	6,944
Investments, at fair value	[1],[3],[6],[15]	1,521
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17]					6,944
Investments, at fair value	[2],[4],[10],[16],[17]					1,219
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15]	1,447
Investments, at fair value	[1],[3],[6],[15]	$ 11,027
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17]					1,447
Investments, at fair value	[2],[4],[10],[16],[17]					$ 8,321
Investment, Identifier [Axis]: Acrisure LLC, Insurance
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	5.75%		5.75%
Principal amount	[1],[9],[18],[19]	$ 11,191
Amortized Cost	[1],[18],[19]	11,271
Investments, at fair value	[1],[3],[18],[19]	11,275
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[17]					7.50%		7.50%
Principal amount	[2],[10],[13],[17]					$ 20,000
Amortized Cost	[2],[10],[17]					19,848
Investments, at fair value	[2],[4],[10],[17]					20,138
Investment, Identifier [Axis]: Aethon United BR LP, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[9]	40,500
Amortized Cost	[1]	40,500
Investments, at fair value	[1],[3]	40,219
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Schedule of Investments [Line Items]
Principal amount	[2],[13],[17]					40,500
Amortized Cost	[2],[17]					40,500
Investments, at fair value	[2],[4],[17]					40,221
Investment, Identifier [Axis]: AirSwift Holdings, Ltd., Common Equity, Commercial & Professional Services
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[15]	6,029
Investments, at fair value	[1],[3],[6],[8],[15]	3,075
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC
Schedule of Investments [Line Items]
Investments, at fair value		$ 0				8,436	[20]			$ 7,782	[20]
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[17],[21]					8,436
Amortized Cost	[2],[10],[17],[21]					8,436
Investments, at fair value	[2],[4],[10],[17],[21]					8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[14],[21]					2,500
Amortized Cost	[2],[10],[14],[21]					2,500
Investments, at fair value	[2],[4],[10],[14],[21]					2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	4.75%		4.75%
Principal amount	[1],[9],[18],[19]	$ 5,500
Amortized Cost	[1],[18],[19]	5,429
Investments, at fair value	[1],[3],[18],[19]	$ 5,431
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	3.75%		3.75%
Principal amount	[1],[9],[18]	$ 9,954
Amortized Cost	[1],[18]	9,638
Investments, at fair value	[1],[3],[18]	9,631
Investment, Identifier [Axis]: Allied Wireline Services, LLC
Schedule of Investments [Line Items]
Investments, at fair value		37,176				63,888				46,339
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		0				10,463				0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[22],[23]	1,527
Investments, at fair value	[1],[3],[6],[15],[22],[23]	0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[21],[24]					1,527
Investments, at fair value	[2],[4],[10],[16],[17],[21],[24]					10,463
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[1],[6],[9],[15],[18],[23],[25]	70,277
Amortized Cost	[1],[6],[15],[18],[23],[25]	70,277
Investments, at fair value	[1],[3],[6],[15],[18],[23],[25]	37,176
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[17],[21]					63,888
Amortized Cost	[2],[10],[17],[21]					63,888
Investments, at fair value	[2],[4],[10],[17],[21]					63,888
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants
Schedule of Investments [Line Items]
Investments, at fair value		0				0				0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[22],[23]	0
Investments, at fair value	[1],[3],[6],[15],[22],[23]	0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[21],[24]					0
Investments, at fair value	[2],[4],[10],[16],[17],[21],[24]					0
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Schedule of Investments [Line Items]
Principal amount	[2],[12],[13],[17]					3,098
Amortized Cost	[2],[12],[17]					3,168
Investments, at fair value	[2],[4],[12],[17]					2,840
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6]	351
Investments, at fair value	[1],[3],[6]	472
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17]					351
Investments, at fair value	[2],[4],[10],[16],[17]					858
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[22]	44,700
Investments, at fair value	[1],[3],[6],[15],[22]	$ 41,357
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[24]					44,700
Investments, at fair value	[2],[4],[10],[16],[17],[24]					$ 52,340
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	3.75%		3.75%
Principal amount	[1],[9],[18]	$ 9,949
Amortized Cost	[1],[18]	8,565
Investments, at fair value	[1],[3],[18]	$ 8,986
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	4.75%		4.75%
Principal amount	[1],[9],[18],[19]	$ 14,975
Amortized Cost	[1],[18],[19]	15,035
Investments, at fair value	[1],[3],[18],[19]	$ 14,992
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Schedule of Investments [Line Items]
Variable rate	[2]					4.00%		4.00%
Principal amount	[2],[13]					$ 39,259
Amortized Cost	[2]					38,085
Investments, at fair value	[2],[4]					$ 39,137
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Variable rate	[1],[5]	5.50%		5.50%
Principal amount	[1],[9]	$ 997
Amortized Cost	[1]	783
Investments, at fair value	[1],[3]	$ 808
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Schedule of Investments [Line Items]
Variable rate	[2]					4.00%		4.00%
Principal amount	[2],[13]					$ 14,286
Amortized Cost	[2]					14,146
Investments, at fair value	[2],[4]					$ 14,155
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Energy—Power
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	3.75%		3.75%
Principal amount	[1],[9],[18]	$ 23,172
Amortized Cost	[1],[18]	22,519
Investments, at fair value	[1],[3],[18]	$ 21,136
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Schedule of Investments [Line Items]
Variable rate	[2]					3.75%		3.75%
Principal amount	[2],[13]					$ 23,601
Amortized Cost	[2]					22,760
Investments, at fair value	[2],[4]					21,935
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17]					3,950
Investments, at fair value	[2],[4],[10],[16],[17]					0
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Participation Option, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17]					1,289
Investments, at fair value	[2],[4],[10],[16],[17]					$ 0
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Schedule of Investments [Line Items]
Variable rate	[2],[10],[16],[17],[26]					9.00%		9.00%
Principal amount	[2],[10],[13],[16],[17],[26]					$ 7,500
Amortized Cost	[2],[10],[16],[17],[26]					6,563
Investments, at fair value	[2],[4],[10],[16],[17],[26]					$ 3,713
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 1
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	6.75%		6.75%
Principal amount	[1],[6],[9],[18]	$ 20,968
Amortized Cost	[1],[6],[18]	20,968
Investments, at fair value	[1],[3],[6],[18]	$ 20,968
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 2
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[27]	6.75%		6.75%
Principal amount	[1],[6],[9],[27]	$ 2,688
Amortized Cost	[1],[6],[27]	2,688
Investments, at fair value	[1],[3],[6],[27]	$ 2,688
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services 3
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[27]	6.75%		6.75%
Principal amount	[1],[6],[9],[27]	$ 1,344
Amortized Cost	[1],[6],[27]	1,344
Investments, at fair value	[1],[3],[6],[27]	$ 1,344
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	7.65%		7.65%
Principal amount	[1],[6],[9],[18]	$ 36,000
Amortized Cost	[1],[6],[18]	35,513
Investments, at fair value	[1],[3],[6],[18]	$ 35,377
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[17]					7.65%		7.65%
Principal amount	[2],[10],[13],[17]					$ 39,000
Amortized Cost	[2],[10],[17]					38,440
Investments, at fair value	[2],[4],[10],[17]					$ 38,240
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Schedule of Investments [Line Items]
Variable rate	[2]					4.25%		4.25%
Principal amount	[2],[13]					$ 31,575
Amortized Cost	[2]					30,712
Investments, at fair value	[2],[4]					31,384
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[28],[29]	8.50%		8.50%
Principal amount	[1],[6],[9],[28],[29]	$ 100,000
Amortized Cost	[1],[6],[28],[29]	3,907
Investments, at fair value	[1],[3],[6],[28],[29]	$ 4,275
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[30],[31]					100,000
Amortized Cost	[2],[10],[30],[31]					11,081
Investments, at fair value	[2],[4],[10],[30],[31]					$ 20,683
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate	[2]					5.25%		5.25%
Principal amount	[2],[13]					$ 26,882
Amortized Cost	[2]					26,609
Investments, at fair value	[2],[4]					$ 26,075
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[17]					6.25%		6.25%
Principal amount	[2],[10],[13],[17]					$ 37,000
Amortized Cost	[2],[10],[17]					36,601
Investments, at fair value	[2],[4],[10],[17]					36,656
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[2],[12],[13]					11,400
Amortized Cost	[2],[12]					11,400
Investments, at fair value	[2],[4],[12]					10,920
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Schedule of Investments [Line Items]
Principal amount	[2],[13],[17]					24,299
Amortized Cost	[2],[17]					25,388
Investments, at fair value	[2],[4],[17]					$ 23,306
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	3.50%		3.50%
Principal amount	[1],[9],[18],[19]	$ 9,975
Amortized Cost	[1],[18],[19]	9,950
Investments, at fair value	[1],[3],[18],[19]	$ 9,936
Investment, Identifier [Axis]: FR BR Holdings LLC, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6]	6.50%		6.50%
Principal amount	[1],[6],[9]	$ 80,582
Amortized Cost	[1],[6]	80,261
Investments, at fair value	[1],[3],[6]	$ 80,405
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[17]					6.50%		6.50%
Principal amount	[2],[10],[13],[17]					$ 81,582
Amortized Cost	[2],[10],[17]					80,371
Investments, at fair value	[2],[4],[10],[17]					$ 81,361
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	7.50%		7.50%
Principal amount	[1],[6],[9],[18]	$ 17,122
Amortized Cost	[1],[6],[18]	16,916
Investments, at fair value	[1],[3],[6],[18]	$ 17,267
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate	[2],[10]					7.50%		7.50%
Principal amount	[2],[10],[13]					$ 17,347
Amortized Cost	[2],[10]					17,103
Investments, at fair value	[2],[4],[10]					$ 17,406
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	50000.00%		50000.00%
Principal amount	[1],[9],[18],[19]	$ 9,957
Amortized Cost	[1],[18],[19]	9,760
Investments, at fair value	[1],[3],[18],[19]	$ 9,849
Investment, Identifier [Axis]: GIP II Blue Holding LP, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	4.50%		4.50%
Principal amount	[1],[9],[18]	$ 3,137
Amortized Cost	[1],[18]	3,100
Investments, at fair value	[1],[3],[18]	3,151
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Schedule of Investments [Line Items]
Variable rate	[2]					4.50%		4.50%
Principal amount	[2],[13]					$ 5,918
Amortized Cost	[2]					5,842
Investments, at fair value	[2],[4]					5,877
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		1,413				5,044				0
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[22],[32]	6,681
Investments, at fair value	[1],[3],[6],[15],[22],[32]	$ 1,413
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[24],[33]					6,681
Investments, at fair value	[2],[4],[10],[16],[17],[24],[33]					$ 5,044
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Schedule of Investments [Line Items]
Variable rate		7.80%		7.80%
Principal amount	[1],[6],[8],[9]	$ 13,951
Amortized Cost	[1],[6],[8]	13,871
Investments, at fair value	[1],[3],[6],[8]	13,263
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[12]					7.75%		7.75%
Principal amount	[2],[10],[12],[13]					$ 14,648
Amortized Cost	[2],[10],[12]					14,556
Investments, at fair value	[2],[4],[10],[12]					$ 14,010
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Schedule of Investments [Line Items]
Variable rate	[2]					5.00%		5.00%
Principal amount	[2],[13]					$ 7,432
Amortized Cost	[2]					7,305
Investments, at fair value	[2],[4]					$ 7,385
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Schedule of Investments [Line Items]
Variable rate	[2]					5.00%		5.00%
Principal amount	[2],[13]					$ 163
Amortized Cost	[2]					160
Investments, at fair value	[2],[4]					162
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 1
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15]	2,786
Investments, at fair value	[1],[3],[6],[15]	0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[25]	12,493
Investments, at fair value	[1],[3],[6],[15],[25]	$ 9,494
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Industrials 1
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17]					2,786
Investments, at fair value	[2],[4],[10],[16],[17]					0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Industrials 2
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[26]					12,493
Investments, at fair value	[2],[4],[10],[16],[17],[26]					$ 9,377
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	7.00%		7.00%
Principal amount	[1],[6],[9],[18]	$ 14,703
Amortized Cost	[1],[6],[18]	14,511
Investments, at fair value	[1],[3],[6],[18]	$ 14,587
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate	[2],[10]					7.25%		7.25%
Principal amount	[2],[10],[13]					$ 14,963
Amortized Cost	[2],[10]					14,752
Investments, at fair value	[2],[4],[10]					14,819
Investment, Identifier [Axis]: Great Western Petroleum, LLC
Schedule of Investments [Line Items]
Investments, at fair value						0				58,055
Investment, Identifier [Axis]: Great Western Petroleum, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value						0				40,731
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	4.00%		4.00%
Principal amount	[1],[9],[18]	$ 9,975
Amortized Cost	[1],[18]	9,975
Investments, at fair value	[1],[3],[18]	9,999
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[9],[18],[19]	15,000
Amortized Cost	[1],[18],[19]	13,577
Investments, at fair value	[1],[3],[18],[19]	13,050
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13]					30,391
Amortized Cost	[2],[10]					31,075
Investments, at fair value	[2],[4],[10]					$ 31,007
Investment, Identifier [Axis]: Hammerhead Resources Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[6],[8],[9]	39,458
Amortized Cost	[1],[6],[8]	39,366
Investments, at fair value	[1],[3],[6],[8]	39,459
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[12],[17]					12.00%		12.00%
Principal amount	[2],[10],[12],[13],[17]					$ 35,118
Amortized Cost	[2],[10],[12],[17]					34,961
Investments, at fair value	[2],[4],[10],[12],[17]					35,118
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		675				810				2,836
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[32]	14,418
Investments, at fair value	[1],[3],[6],[15],[32]	$ 675
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[16],[17],[33]					15,059
Investments, at fair value	[2],[4],[16],[17],[33]					810
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	5.00%		5.00%
Principal amount	[1],[9],[18]	$ 21,000
Amortized Cost	[1],[18]	20,370
Investments, at fair value	[1],[3],[18]	20,297
Investment, Identifier [Axis]: Limetree Bay Energy, LLC
Schedule of Investments [Line Items]
Investments, at fair value						0				3,166
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units
Schedule of Investments [Line Items]
Investments, at fair value		0				1,885				6,046
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[33]					21,458
Investments, at fair value	[2],[4],[10],[16],[17],[33]					1,885
Investment, Identifier [Axis]: MB Precision Investment Holdings LLC, Class A-2 Units, Industrials
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[24]					490
Investments, at fair value	[2],[4],[10],[16],[17],[24]					0
Investment, Identifier [Axis]: MECO IV Holdco, LLC
Schedule of Investments [Line Items]
Investments, at fair value						0				22,745
Investment, Identifier [Axis]: MECO IV Holdco, LLC, Class A-1 Units
Schedule of Investments [Line Items]
Investments, at fair value						0				4,181
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[22]	138,208
Investments, at fair value	[1],[3],[6],[22]	$ 250,421
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[17],[24]					138,208
Investments, at fair value	[2],[4],[10],[17],[24]					$ 312,372
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, LP, Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	4.00%		4.00%
Principal amount	[1],[9],[18],[19]	$ 14,944
Amortized Cost	[1],[18],[19]	14,849
Investments, at fair value	[1],[3],[18],[19]	$ 14,925
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Schedule of Investments [Line Items]
Variable rate	[2]					3.75%		3.75%
Principal amount	[2],[13]					$ 7,920
Amortized Cost	[2]					7,886
Investments, at fair value	[2],[4]					7,862
Investment, Identifier [Axis]: Meritage Midstream Services II, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6]	6.75%		6.75%
Principal amount	[1],[6],[9]	$ 21,759
Amortized Cost	[1],[6]	21,361
Investments, at fair value	[1],[3],[6]	22,409
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[9]	11,693
Amortized Cost	[1]	10,635
Investments, at fair value	[1],[3]	11,340
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[2],[13],[17]					11,693
Amortized Cost	[2],[17]					10,358
Investments, at fair value	[2],[4],[17]					10,561
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[15],[18],[25]	157,633
Investments, at fair value	[1],[3],[6],[8],[15],[18],[25]	139,911
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[16],[17],[26]					157,633
Investments, at fair value	[2],[4],[10],[12],[16],[17],[26]					125,000
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[16],[17]					630
Investments, at fair value	[2],[4],[10],[12],[16],[17]					3
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[15]	3,083
Investments, at fair value	[1],[3],[6],[8],[15]	695
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[16],[17]					3,083
Investments, at fair value	[2],[4],[10],[12],[16],[17]					10
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike:$13.56, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[15]	630
Investments, at fair value	[1],[3],[6],[8],[15]	168
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[15]	576
Investments, at fair value	[1],[3],[6],[8],[15]	173
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[16],[17]					576
Investments, at fair value	[2],[4],[10],[12],[16],[17]					2
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[15]	2,623
Investments, at fair value	[1],[3],[6],[8],[15]	662
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[16],[17]					2,623
Investments, at fair value	[2],[4],[10],[12],[16],[17]					8
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Schedule of Investments [Line Items]
Principal amount	[2],[12],[13]					19,125
Amortized Cost	[2],[12]					18,668
Investments, at fair value	[2],[4],[12]					14,401
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Schedule of Investments [Line Items]
Principal amount	[1],[8],[9],[18],[19]	10,000
Amortized Cost	[1],[8],[18],[19]	9,809
Investments, at fair value	[1],[3],[8],[18],[19]	$ 9,851
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6]	9.00%		9.00%
Principal amount	[1],[6],[9]	$ 20,000
Amortized Cost	[1],[6]	19,400
Investments, at fair value	[1],[3],[6]	$ 19,400
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[17]					73,114
Investments, at fair value	[2],[4],[10],[12],[17]					$ 83,590
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Schedule of Investments [Line Items]
Variable rate	[2],[10]					5.25%		5.25%
Principal amount	[2],[10],[13]					$ 18,659
Amortized Cost	[2],[10]					18,579
Investments, at fair value	[2],[4],[10]					$ 18,847
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Schedule of Investments [Line Items]
Variable rate	[2],[10],[14]					5.25%		5.25%
Principal amount	[2],[10],[13],[14]					$ 11,341
Amortized Cost	[2],[10],[14]					11,341
Investments, at fair value	[2],[4],[10],[14]					$ 11,455
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Schedule of Investments [Line Items]
Variable rate	[2],[17]					3.25%		3.25%
Principal amount	[2],[13],[17]					$ 32,357
Amortized Cost	[2],[17]					32,220
Investments, at fair value	[2],[4],[17]					$ 32,026
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 1
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	4.75%		4.75%
Principal amount	[1],[9],[18]	$ 5,760
Amortized Cost	[1],[18]	5,712
Investments, at fair value	[1],[3],[18]	$ 5,761
Investment, Identifier [Axis]: Parkway Generation LLC, Energy—Power 2
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	4.75%		4.75%
Principal amount	[1],[9],[18]	$ 43,579
Amortized Cost	[1],[18]	43,217
Investments, at fair value	[1],[3],[18]	43,585
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Schedule of Investments [Line Items]
Variable rate	[2]					4.75%		4.75%
Principal amount	[2],[13]					$ 5,760
Amortized Cost	[2]					5,708
Investments, at fair value	[2],[4]					$ 5,700
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Schedule of Investments [Line Items]
Variable rate	[2]					4.75%		4.75%
Principal amount	[2],[13]					$ 43,910
Amortized Cost	[2]					43,513
Investments, at fair value	[2],[4]					$ 43,285
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Schedule of Investments [Line Items]
Variable rate	[2],[10],[17]					6.75%		6.75%
Principal amount	[2],[10],[13],[17]					$ 13,545
Amortized Cost	[2],[10],[17]					13,528
Investments, at fair value	[2],[4],[10],[17]					$ 13,394
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Schedule of Investments [Line Items]
Variable rate	[2],[10],[14]					6.75%		6.75%
Principal amount	[2],[10],[13],[14]					$ 1,505
Amortized Cost	[2],[10],[14]					1,505
Investments, at fair value	[2],[4],[10],[14]					1,488
Investment, Identifier [Axis]: Permian Production Holdings, LLC
Schedule of Investments [Line Items]
Investments, at fair value		4,840				4,767				7,889
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		6,103				11,420				8,829
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[22],[32]	5
Investments, at fair value	[1],[3],[6],[15],[22],[32]	6,103
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[17],[24],[33]					5
Investments, at fair value	[2],[4],[10],[17],[24],[33]					11,420
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[6],[9],[32]	4,840
Amortized Cost	[1],[6],[32]	4,437
Investments, at fair value	[1],[3],[6],[32]	$ 4,840
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[17],[33]					4,767
Amortized Cost	[2],[10],[17],[33]					4,266
Investments, at fair value	[2],[4],[10],[17],[33]					4,767
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount	[2],[13]					26,365
Amortized Cost	[2]					27,511
Investments, at fair value	[2],[4]					25,703
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount	[2],[13],[17]					5,200
Amortized Cost	[2],[17]					5,257
Investments, at fair value	[2],[4],[17]					$ 4,473
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	3.50%		3.50%
Principal amount	[1],[9],[18],[19]	$ 9,974
Amortized Cost	[1],[18],[19]	9,971
Investments, at fair value	[1],[3],[18],[19]	$ 9,940
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	6.75%		6.75%
Principal amount	[1],[6],[9],[18]	$ 9,370
Amortized Cost	[1],[6],[18]	9,340
Investments, at fair value	[1],[3],[6],[18]	9,759
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Schedule of Investments [Line Items]
Variable rate	[2],[10]					6.75%		6.75%
Principal amount	[2],[10],[13]					$ 9,370
Amortized Cost	[2],[10]					9,304
Investments, at fair value	[2],[4],[10]					$ 9,310
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Schedule of Investments [Line Items]
Variable rate	[2],[10],[14]					6.75%		6.75%
Principal amount	[2],[10],[13],[14]					$ 2,477
Amortized Cost	[2],[10],[14]					2,477
Investments, at fair value	[2],[4],[10],[14]					2,461
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Schedule of Investments [Line Items]
Principal amount	[1],[6],[9],[15],[25]	13,297
Amortized Cost	[1],[6],[15],[25]	12,329
Investments, at fair value	[1],[3],[6],[15],[25]	8,561
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Schedule of Investments [Line Items]
Principal amount	[1],[6],[9],[15],[25]	4,015
Amortized Cost	[1],[6],[15],[25]	3,827
Investments, at fair value	[1],[3],[6],[15],[25]	0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[6],[9],[27]	2,709
Amortized Cost	[1],[6],[27]	2,709
Investments, at fair value	[1],[3],[6],[27]	$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[14]					2,709
Amortized Cost	[2],[10],[14]					2,709
Investments, at fair value	[2],[4],[10],[14]					0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[17]					12,121
Amortized Cost	[2],[10],[17]					12,121
Investments, at fair value	[2],[4],[10],[17]					9,997
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13],[17]					3,643
Amortized Cost	[2],[10],[17]					3,643
Investments, at fair value	[2],[4],[10],[17]					$ 0
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Energy—Power
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	6.00%		6.00%
Principal amount	[1],[6],[9],[18]	$ 57,869
Amortized Cost	[1],[6],[18]	57,133
Investments, at fair value	[1],[3],[6],[18]	$ 53,702
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Schedule of Investments [Line Items]
Variable rate	[2],[10]					6.00%		6.00%
Principal amount	[2],[10],[13]					$ 58,459
Amortized Cost	[2],[10]					57,508
Investments, at fair value	[2],[4],[10]					58,443
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18],[19]	4.00%		4.00%
Principal amount	[1],[9],[18],[19]	$ 9,975
Amortized Cost	[1],[18],[19]	10,012
Investments, at fair value	[1],[3],[18],[19]	9,996
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Schedule of Investments [Line Items]
Principal amount	[2],[12],[13]					29,772
Amortized Cost	[2],[12]					29,633
Investments, at fair value	[2],[4],[12]					29,678
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		$ 0				41,851				48,356
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[17],[33],[34]					46,599
Investments, at fair value	[2],[4],[10],[12],[17],[33],[34]					41,851
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	3.50%		3.50%
Principal amount	[1],[9],[18]	$ 9,975
Amortized Cost	[1],[18]	9,883
Investments, at fair value	[1],[3],[18]	9,889
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[6],[9],[18]	10,419
Amortized Cost	[1],[6],[18]	9,999
Investments, at fair value	[1],[3],[6],[18]	$ 9,780
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Schedule of Investments [Line Items]
Principal amount	[2],[10],[13]					10,526
Amortized Cost	[2],[10]					10,064
Investments, at fair value	[2],[4],[10]					10,074
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[24],[26]					99,766
Investments, at fair value	[2],[4],[10],[16],[17],[24],[26]					$ 83,647
Investment, Identifier [Axis]: SilverBow Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[8]	7.50%		7.50%
Principal amount	[1],[6],[8],[9]	$ 14,250
Amortized Cost	[1],[6],[8]	14,217
Investments, at fair value	[1],[3],[6],[8]	$ 14,250
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[12],[17]					7.50%		7.50%
Principal amount	[2],[10],[12],[13],[17]					$ 14,250
Amortized Cost	[2],[10],[12],[17]					14,199
Investments, at fair value	[2],[4],[10],[12],[17]					$ 14,322
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Energy—Upstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[8],[18]	5.75%		5.75%
Principal amount	[1],[6],[8],[9],[18]	$ 18,000
Amortized Cost	[1],[6],[8],[18]	17,866
Investments, at fair value	[1],[3],[6],[8],[18]	18,284
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[12],[17]					6.50%		6.50%
Principal amount	[2],[10],[12],[13],[17]					$ 19,500
Amortized Cost	[2],[10],[12],[17]					19,318
Investments, at fair value	[2],[4],[10],[12],[17]					19,256
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[2],[12],[13],[17]					7,590
Amortized Cost	[2],[12],[17]					7,837
Investments, at fair value	[2],[4],[12],[17]					6,461
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC 2
Schedule of Investments [Line Items]
Investments, at fair value		49,192				51,098				50,770
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[6],[8],[9],[15],[23]	60,603
Amortized Cost	[1],[6],[8],[15],[23]	54,514
Investments, at fair value	[1],[3],[6],[8],[15],[23]	$ 49,192
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[2],[10],[21],[35]					60,603
Amortized Cost	[2],[10],[21],[35]					54,514
Investments, at fair value	[2],[4],[10],[21],[35]					51,098
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Limited, Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[16],[17],[36]					6,029
Investments, at fair value	[2],[4],[10],[12],[16],[17],[36]					3,131
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	5.50%		5.50%
Principal amount	[1],[9],[18]	$ 10,240
Amortized Cost	[1],[18]	9,612
Investments, at fair value	[1],[3],[18]	9,844
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[2],[13],[17]					19,761
Amortized Cost	[2],[17]					19,676
Investments, at fair value	[2],[4],[17]					18,480
Investment, Identifier [Axis]: Telpico, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		0				0				0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[22],[32]	0
Investments, at fair value	[1],[3],[6],[15],[22],[32]	0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[24],[33]					0
Investments, at fair value	[2],[4],[10],[16],[17],[24],[33]					0
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[22]	7,571
Investments, at fair value	[1],[3],[6],[15],[22]	$ 4,790
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[24]					7,571
Investments, at fair value	[2],[4],[10],[16],[17],[24]					$ 6,801
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	7.50%		7.50%
Principal amount	[1],[6],[9],[18]	$ 20,537
Amortized Cost	[1],[6],[18]	20,537
Investments, at fair value	[1],[3],[6],[18]	$ 19,972
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[17]					7.50%		7.50%
Principal amount	[2],[10],[13],[17]					$ 20,537
Amortized Cost	[2],[10],[17]					20,537
Investments, at fair value	[2],[4],[10],[17]					$ 20,537
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Schedule of Investments [Line Items]
Variable rate	[2]					4.25%		4.25%
Principal amount	[2],[13]					$ 28,436
Amortized Cost	[2]					28,484
Investments, at fair value	[2],[4]					28,418
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Schedule of Investments [Line Items]
Variable rate	[1],[5],[18]	4.00%		4.00%
Principal amount	[1],[9],[18]	$ 9,962
Amortized Cost	[1],[18]	9,245
Investments, at fair value	[1],[3],[18]	9,493
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[8]	1,617
Investments, at fair value	[1],[3],[8]	2,023
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[12],[16],[17]					1,617
Investments, at fair value	[2],[4],[12],[16],[17]					1,655
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[18]	78,091
Investments, at fair value	[1],[3],[6],[8],[18]	98,773
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10]					77,943
Investments, at fair value	[2],[4],[10]					90,479
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[8],[15]	714
Investments, at fair value	[1],[3],[6],[8],[15]	9,552
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[12],[16],[17]					714
Investments, at fair value	[2],[4],[10],[12],[16],[17]					5,711
Investment, Identifier [Axis]: Warren Resources, Inc.
Schedule of Investments [Line Items]
Investments, at fair value		23,763				23,584				23,688
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		18,193				36,982				$ 25,854
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[15],[23]	20,754
Investments, at fair value	[1],[3],[6],[15],[23]	$ 18,193
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[2],[10],[16],[17],[21]					20,754
Investments, at fair value	[2],[4],[10],[16],[17],[21]					$ 36,982
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18],[23]	9.00%		9.00%
Principal amount	[1],[6],[9],[18],[23]	$ 23,763
Amortized Cost	[1],[6],[18],[23]	23,763
Investments, at fair value	[1],[3],[6],[18],[23]	$ 23,763
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Schedule of Investments [Line Items]
Variable rate	[2],[10],[21]					9.00%		9.00%
Principal amount	[2],[10],[13],[21]					$ 23,584
Amortized Cost	[2],[10],[21]					23,584
Investments, at fair value	[2],[4],[10],[21]					$ 23,584
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Schedule of Investments [Line Items]
Variable rate	[1],[5],[6],[18]	9.85%		9.85%
Principal amount	[1],[6],[9],[18]	$ 42,938
Amortized Cost	[1],[6],[18]	42,938
Investments, at fair value	[1],[3],[6],[18]	41,839
Investment, Identifier [Axis]: Wattbridge Inc., Power
Schedule of Investments [Line Items]
Variable rate	[2],[10]					7.85%		7.85%
Principal amount	[2],[10],[13]					$ 42,500
Amortized Cost	[2],[10]					42,500
Investments, at fair value	[2],[4],[10]					41,880
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Principal amount		192,881				274,088
Amortized Cost		192,881				274,088
Investments, at fair value		$ 192,929				$ 275,058
Percent of net assets		100.00%		100.00%		100.00%		100.00%
Sustainable Infrastructure Investments, LLC | London Interbank Offered Rate (LIBOR)
Schedule of Investments [Line Items]
Variable rate		5.66%		5.66%		4.77%		4.77%
Sustainable Infrastructure Investments, LLC | Canadian Dollar Offer Rate
Schedule of Investments [Line Items]
Variable rate		5.51%		5.51%		4.94%		4.94%
Sustainable Infrastructure Investments, LLC | Net Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Amortized Cost		$ 192,881				$ 274,088
Investments, at fair value		$ 192,929				$ 275,058
Percent of net assets		100.00%		100.00%		100.00%		100.00%
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Alianca Transportadora de Gas Participacoes S.A., Midstream
Schedule of Investments [Line Items]
Variable rate						2.60%		2.60%
Principal amount						$ 73,707
Amortized Cost						73,707
Investments, at fair value						$ 74,601
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Blue Heron Intermediate Holdco I, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate		1.88%		1.88%		1.88%		1.88%
Principal amount		$ 30,958				$ 31,832
Amortized Cost		30,958				31,832
Investments, at fair value		$ 31,004				$ 31,885
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Cedar Creek II LLC, Renewables
Schedule of Investments [Line Items]
Variable rate		1.88%		1.88%		1.88%		1.88%
Principal amount		$ 8,160				$ 8,710
Amortized Cost		8,160				8,710
Investments, at fair value		$ 8,166				$ 8,722
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Copper Mountain Solar 3, LLC, Renewables
Schedule of Investments [Line Items]
Variable rate		1.88%		1.88%		1.75%		1.75%
Principal amount		$ 17,105				$ 17,804
Amortized Cost		17,105				17,804
Investments, at fair value		$ 17,209				$ 17,879
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: FLNG Liquefaction 2, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate		1.50%		1.50%		1.50%		1.50%
Principal amount		$ 26,972				$ 28,170
Amortized Cost		26,972				28,170
Investments, at fair value		26,835				27,990
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Largest Portfolio Company Investment
Schedule of Investments [Line Items]
Principal amount		$ 57,784				$ 73,707
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Meikle Wind Energy, LP, Renewables
Schedule of Investments [Line Items]
Variable rate		1.50%		1.50%		1.50%		1.50%
Principal amount				$ 15,431				$ 16,030
Amortized Cost		$ 11,872				$ 12,332
Investments, at fair value		$ 11,405				$ 11,873
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: NES Hercules Class B Member, LLC, Renewables
Schedule of Investments [Line Items]
Variable rate		1.63%		1.63%		1.50%		1.50%
Principal amount		$ 24,176				$ 24,487
Amortized Cost		24,176				24,487
Investments, at fair value		$ 24,596				$ 24,954
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: ST EIP Holdco LLC, Midstream
Schedule of Investments [Line Items]
Variable rate		2.50%		2.50%		2.50%		2.50%
Principal amount		$ 57,784				$ 58,673
Amortized Cost		57,784				58,673
Investments, at fair value		$ 57,577				$ 58,288
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Seine Funding, LLC
Schedule of Investments [Line Items]
Variable rate												1.20%
Principal amount												$ 634,103
Sustainable Infrastructure Investments, LLC | Investment, Identifier [Axis]: Top of the World Wind Energy LLC, Renewables
Schedule of Investments [Line Items]
Variable rate		2.13%		2.13%		1.88%		1.88%
Principal amount		$ 15,854				$ 18,373
Amortized Cost		15,854				18,373
Investments, at fair value		$ 16,137				$ 18,866

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] Security may be an obligation of one or more entities affiliated with the named company.

[3] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[5] Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of September 30, 2023, the Secured Overnight Financing Rate, or SOFR, or S, was 5.40% and the Overnight Bank Funding Rate, or OBFR, was 5.32%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.

[6] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[7] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[8] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of September 30, 2023, 76.5% of the Company’s total assets represented qualifying assets.

[9] Denominated in U.S. dollars, unless otherwise noted.

[10] Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).

[11] Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.

[12] The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.

[13] Denominated in U.S. dollars, unless otherwise noted.

[14] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[15] Security is non-income producing.

[16] Security is non-income producing.

[17] Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).

[18] Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).

[19] Security or portion thereof unsettled as of September 30, 2023.

[20] Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[21] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Dividend Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC(4) $7,782 $654 $— $— $— $8,436 $— $654 $— Allied Wireline Services, LLC46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC22,745 455 (23,200)— — — — 455 — Warren Resources, Inc.23,688 237 (341)— — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC50,770 — — — 328 51,098 — — 735 Equity/OtherAllied Wireline Services, LLC, Common Equity— — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants— — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units4,181 — (18,060)15,899 (2,020)— — — — Warren Resources, Inc., Common Equity25,854 — — — 11,128 36,982 — — — $181,359 $7,154 $(41,601)$15,899 $31,640 $194,451 $2,936 $7,154 $735  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK and dividend income presented for the year ended December 31, 2022. (4)    Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500.

[22] Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

[23] Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $8,436 $138 $(8,574)$— $— $— $256 $139 Allied Wireline Services, LLC63,888 6,389 — — (33,101)37,176 2,910 — Warren Resources, Inc.23,584 23,882 (23,703)— — 23,763 2,521 179 Sustainable Infrastructure Investments, LLCSustainable Infrastructure Investments, LLC51,098 — — — (1,906)49,192 — — Equity/OtherAllied Wireline Services, LLC, Common Equity10,463 — — — (10,463)— — — Allied Wireline Services, LLC, Warrants— — — — — — — — Warren Resources, Inc., Common Equity36,982 — — — (18,789)18,193 — — $194,451 $30,409 $(32,277)$— $(64,259)$128,324 $5,687 $318  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[24] Security held within FSEP Investments, Inc., a wholly-owned subsidiary of the Company.

[25] Security was on non-accrual status as of September 30, 2023.

[26] Security was on non-accrual status as of December 31, 2022.

[27] Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.

[28] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[29] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[30] Investment is a real property interest and is included with Senior Secured Loans—First Lien to facilitate comparison with other investments.

[31] Security held within EP Northern Investments, LLC, a wholly-owned subsidiary of the Company.

[32] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of September 30, 2023, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of September 30, 2023: Portfolio Company Fair Value at December 31, 2022 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at September 30, 2023 Interest Income(3) PIK Income(3) Senior Secured Loans—First LienPermian Production Holdings, LLC$4,767 $171 $— $— $(98)$4,840 $398 $73 Equity/OtherGWP Midstream Holdco, LLC, Common Equity5,044 — — — (3,631)1,413 — — Harvest Oil & Gas Corp., Common Equity810 — (641)— 506 675 — — Limetree Bay Energy, LLC, Class A Units1,885 246 — (21,704)19,573 — — — Permian Production Holdings, LLC, Common Equity11,420 — — — (5,317)6,103 — — Ridgeback Resources Inc., Common Equity41,851 — (35,240)(11,359)4,748 — — — Telpico, LLC, Common Equity— — — — — — — — $65,777 $417 $(35,881)$(33,063)$15,781 $13,031 $398 $73  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest and PIK income presented for the nine months ended September 30, 2023.

[33] Under the 1940 Act, the Company generally is deemed to be an “affiliated person” of a portfolio company if it owns 5% or more of the portfolio company’s voting securities and generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control”. The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions(1) Gross Reductions(2) Net Realized Gain (Loss)Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income(3) PIK Income(3) Fee Income(3) Dividend Income(3) Senior Secured Loans—First LienLimetree Bay Energy, LLC$3,166 $— $(1,587)$(12,756)$11,177 $— $— $— $— $— Permian Production Holdings, LLC7,889 697 (3,674)551 (696)4,767 570 105 — — Senior Secured BondsGreat Western Petroleum, LLC58,055 96 (55,096)1,087 (4,142)— 2,649 — 7,268 — Equity/OtherGreat Western Petroleum, LLC, Common Equity40,731 — (84,871)54,081 (9,941)— — — — — GWP Midstream Holdco, LLC, Common Equity— 6,681 — — (1,637)5,044 — — — — Harvest Oil & Gas Corp., Common Equity2,836 — (743)— (1,283)810 — — — — Limetree Bay Energy, LLC, Class A Units6,046 1,795 — — (5,956)1,885 — — — — Permian Production Holdings, LLC, Common Equity8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity48,356 — (12,559)173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity— — — — — — — — — — $175,908 $9,273 $(158,530)$43,136 $(4,010)$65,777 $3,219 $105 $7,268 $5,417  _____________ (1)    Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2)    Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3)    Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

[34] Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

[35] Includes the effect of swap contracts.

[36] Investment denominated in British pounds. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022.

XML

Investment Portfolio - Balance Sheet Information for SIIJV (Details) - USD ($) $ in Thousands	Sep. 30, 2023		Jun. 30, 2023	Dec. 31, 2022		Sep. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Schedule of Investments [Line Items]
Investments, at fair value	$ 1,492,766	[1],[2]		$ 2,047,115	[3],[4]
Total assets	1,796,334			2,558,781
Total liabilities	138,873			805,033
Total shareholders' equity	1,657,461		$ 1,679,723	1,753,748		$ 1,731,841	$ 1,602,323	$ 1,791,255
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Investments, at fair value	192,929			275,058
Cash and other assets	78,241			10,380
Total assets	271,170			285,438
Debt	195,734			213,583
Other liabilities	3,159			3,358
Total liabilities	198,893			216,941
Total shareholders' equity	$ 72,277			$ 68,497

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

XML

Investment Portfolio - Operations Information for SIIJV (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Investments [Line Items]
Total investment income		$ 30,443	$ 40,788	$ 115,014	$ 123,770
Interest expense	[1]	738	14,104	19,066	40,994
Administrative services		1,887	1,695	4,566	4,605
Custodian and accounting fees		820	768	2,365	2,216
Professional services		82	369	444	735
Net expenses		12,891	29,081	57,088	82,385
Net investment income before taxes		17,552	11,707	57,926	41,385
Net realized and unrealized gain (loss)		(44,141)	(62,791)	(140,404)	113,546
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Total investment income		5,272	3,313	15,083	7,386
Interest expense		3,410	1,201	9,870	3,352
Administrative services		46	42	134	123
Custodian and accounting fees		58	23	161	127
Professional services		70	25	170	76
Other		11	44	31	44
Net expenses		3,595	1,335	10,366	3,722
Net investment income before taxes		1,677	1,978	4,717	3,664
Net realized and unrealized gain (loss)		(2,273)	836	(937)	(1,180)
Net increase (decrease) in net assets resulting from operations		$ (596)	$ 2,814	$ 3,780	$ 2,484

[1] See Note 9 for a discussion of the Company's financing arrangements.

XML

Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023		Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	$ 1,492,766	[1],[2]	$ 2,047,115	[3],[4]
Level 1—Price quotations in active markets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	2,023		2,465
Level 2—Significant other observable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	313,384		450,445
Level 3—Significant unobservable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	$ 1,177,359		$ 1,594,205

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

XML

Fair Value of Financial Instruments - Assets and Liabilities Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 106	$ 0
Liabilities	404	698
Level 1—Price quotations in active markets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Level 2—Significant other observable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	106	0
Liabilities	404	698
Level 3—Significant unobservable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	$ 0	$ 0

XML

Fair Value of Financial Instruments - Reconciliation Fair Value, Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion of discount (amortization of premium)	$ 4,484	$ 5,425
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	1,594,205	1,621,482
Accretion of discount (amortization of premium)	3,452	5,234
Purchases	65,563	256,488
Paid-in-kind interest	14,174	18,268
Sales and repayments	(354,036)	(421,859)
Transfers into Level 3	810	61,541
Transfers out of Level 3	0	0
Fair value at end of period	1,177,359	1,702,694
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(135,242)	93,609
Total | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(49,602)	27,008
Total | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(97,207)	134,532
Senior Secured Loans—First Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	443,245	414,075
Accretion of discount (amortization of premium)	1,369	1,426
Purchases	65,317	110,486
Paid-in-kind interest	9,834	9,627
Sales and repayments	(76,948)	(122,163)
Transfers into Level 3	0	58,705
Transfers out of Level 3	0	0
Fair value at end of period	392,383	486,018
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(50,106)	16,286
Senior Secured Loans—First Lien | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(2,864)	(12,186)
Senior Secured Loans—First Lien | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(47,570)	26,048
Senior Secured Loans—Second Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	143,270	84,083
Accretion of discount (amortization of premium)	710	194
Purchases	0	110,150
Paid-in-kind interest	0	537
Sales and repayments	(73,544)	(49,577)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	69,599	145,632
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(591)	22
Senior Secured Loans—Second Lien | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(52)	446
Senior Secured Loans—Second Lien | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(785)	(201)
Senior Secured Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	10,074	10,371
Accretion of discount (amortization of premium)	38	36
Purchases	0	0
Paid-in-kind interest	0	0
Sales and repayments	(107)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	9,780	10,195
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(229)	(212)
Senior Secured Bonds | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	4	0
Senior Secured Bonds | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(229)	(212)
Unsecured Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	54,374	104,659
Accretion of discount (amortization of premium)	105	105
Purchases	0	19,800
Paid-in-kind interest	4,340	7,916
Sales and repayments	(1,500)	(84,415)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	57,743	54,918
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	416	(293)
Unsecured Debt | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	8	(27,541)
Unsecured Debt | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	416	34,394
Preferred Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	400,414	497,288
Accretion of discount (amortization of premium)	1,230	3,473
Purchases	0	0
Paid-in-kind interest	0	188
Sales and repayments	(162,115)	(61,186)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	259,205	431,651
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	25,880	(6,787)
Preferred Equity | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(11,847)	1,329
Preferred Equity | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	31,523	(9,441)
Sustainable Infrastructure Investments, LLC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	51,098	50,770
Accretion of discount (amortization of premium)	0	0
Purchases	0	0
Paid-in-kind interest	0	0
Sales and repayments	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	49,192	52,047
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(1,906)	1,277
Sustainable Infrastructure Investments, LLC | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	0
Sustainable Infrastructure Investments, LLC | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(1,906)	1,277
Equity/Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	491,730	460,236
Accretion of discount (amortization of premium)	0	0
Purchases	246	16,052
Paid-in-kind interest	0	0
Sales and repayments	(39,822)	(104,518)
Transfers into Level 3	810	2,836
Transfers out of Level 3	0	0
Fair value at end of period	339,457	522,233
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(108,706)	83,316
Equity/Other | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(34,851)	64,960
Equity/Other | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	$ (78,656)	$ 82,667

XML

Fair Value of Financial Instruments - Schedule of Valuation Techniques and Significant Unobservable Inputs Used in Recurring Level 3 Fair Value (Details) $ in Thousands	Sep. 30, 2023 USD ($) MMcfe / d MMBoe / d MMBoe Bcfe		Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 1,492,766	[1],[2]	$ 2,047,115	[3],[4]
Level 3—Significant unobservable inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	1,177,359		1,594,205
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 358,949		$ 413,268
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Market Comparables | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.088		0.085
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Market Comparables | Minimum | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	3.9		5.0
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Market Comparables | Maximum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.213		0.218
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Market Comparables | Maximum | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	7.7		7.5
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Market Comparables | Weighted Average | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.136		0.123
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Market Comparables | Weighted Average | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	5.4		6.3
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 4,275		$ 29,977
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Discounted Cash Flow | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.090		0.115
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Discounted Cash Flow | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.140		0.195
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Discounted Cash Flow | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.115		0.154
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Cost
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 19,400
Level 3—Significant unobservable inputs | Net Senior Secured Loans—First Lien | Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	9,759
Level 3—Significant unobservable inputs | Net Senior Secured Loans—Second Lien | Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 69,599		$ 143,270
Level 3—Significant unobservable inputs | Net Senior Secured Loans—Second Lien | Market Comparables | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.127		0.103
Level 3—Significant unobservable inputs | Net Senior Secured Loans—Second Lien | Market Comparables | Maximum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.145		0.143
Level 3—Significant unobservable inputs | Net Senior Secured Loans—Second Lien | Market Comparables | Weighted Average | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.136		0.118
Level 3—Significant unobservable inputs | Senior Secured Bonds | Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 9,780		$ 10,074
Level 3—Significant unobservable inputs | Senior Secured Bonds | Market Comparables | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.078		0.069
Level 3—Significant unobservable inputs | Senior Secured Bonds | Market Comparables | Maximum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.088		0.079
Level 3—Significant unobservable inputs | Senior Secured Bonds | Market Comparables | Weighted Average | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.083		0.074
Level 3—Significant unobservable inputs | Unsecured Debt | Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 18,284		$ 19,256
Level 3—Significant unobservable inputs | Unsecured Debt | Market Comparables | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.108		0.103
Level 3—Significant unobservable inputs | Unsecured Debt | Market Comparables | Maximum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.118		0.113
Level 3—Significant unobservable inputs | Unsecured Debt | Market Comparables | Weighted Average | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.113		0.108
Level 3—Significant unobservable inputs | Unsecured Debt | Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 39,459		$ 35,118
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 259,205		$ 316,767
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Minimum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.110		0.088
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Minimum | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	13.3		9.5
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Minimum | Net Aircraft Book Value Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1.0		1.0
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Maximum | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.268		0.303
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Maximum | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	14.3		10.5
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Maximum | Net Aircraft Book Value Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1.0		1.0
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Weighted Average | Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.201		0.190
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Weighted Average | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	13.8		10.0
Level 3—Significant unobservable inputs | Preferred Equity | Market Comparables | Weighted Average | Net Aircraft Book Value Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1.0		1.0
Level 3—Significant unobservable inputs | Preferred Equity | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value			$ 83,647
Level 3—Significant unobservable inputs | Preferred Equity | Discounted Cash Flow | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.113
Level 3—Significant unobservable inputs | Preferred Equity | Discounted Cash Flow | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.123
Level 3—Significant unobservable inputs | Preferred Equity | Discounted Cash Flow | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.118
Level 3—Significant unobservable inputs | Sustainable Infrastructure Investments, LLC | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 49,192		$ 51,098
Level 3—Significant unobservable inputs | Sustainable Infrastructure Investments, LLC | Discounted Cash Flow | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.135		0.135
Level 3—Significant unobservable inputs | Sustainable Infrastructure Investments, LLC | Discounted Cash Flow | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.145		0.145
Level 3—Significant unobservable inputs | Sustainable Infrastructure Investments, LLC | Discounted Cash Flow | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.140		0.140
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 308,680		$ 481,623
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Minimum | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	2.8		1.8
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Minimum | Production Multiples (Mboe/d)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	26,591,000		27,946,000
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Minimum | Proved Reserves Multiples (Mmboe)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	5,600		6,900
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Minimum | Production Multiples (MMcfe/d)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	3,000,000		3,400,000
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Minimum | Proved Reserves Multiples (Bcfe)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.7		0.8
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Minimum | PV-10 Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.3		0.5
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Maximum | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	14.3		10.5
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Maximum | Production Multiples (Mboe/d)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	29,529,000		37,500,000
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Maximum | Proved Reserves Multiples (Mmboe)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	6,200		10,300
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Maximum | Production Multiples (MMcfe/d)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	3,600,000		3,700,000
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Maximum | Proved Reserves Multiples (Bcfe)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.7		0.9
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Maximum | PV-10 Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.9		0.9
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Weighted Average | EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	6.1		5.4
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Weighted Average | Production Multiples (Mboe/d)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	28,060,000		30,265,300
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Weighted Average | Proved Reserves Multiples (Mmboe)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	5,900		7,600
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Weighted Average | Production Multiples (MMcfe/d)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	3,300,000		3,550,000
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Weighted Average | Proved Reserves Multiples (Bcfe)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.7		0.8
Level 3—Significant unobservable inputs | Equity/Other | Market Comparables | Weighted Average | PV-10 Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.8		0.8
Level 3—Significant unobservable inputs | Equity/Other | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 2,478		$ 2,488
Level 3—Significant unobservable inputs | Equity/Other | Discounted Cash Flow | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.080		0.080
Level 3—Significant unobservable inputs | Equity/Other | Discounted Cash Flow | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.350		0.330
Level 3—Significant unobservable inputs | Equity/Other | Discounted Cash Flow | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.117		0.238
Level 3—Significant unobservable inputs | Equity/Other | Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 17,049		$ 1,885
Level 3—Significant unobservable inputs | Equity/Other | Option Valuation Model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 11,250		$ 5,734
Level 3—Significant unobservable inputs | Equity/Other | Option Valuation Model | Minimum | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.272		0.315
Level 3—Significant unobservable inputs | Equity/Other | Option Valuation Model | Maximum | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.650		0.551
Level 3—Significant unobservable inputs | Equity/Other | Option Valuation Model | Weighted Average | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.364		0.366

[1] Security may be an obligation of one or more entities affiliated with the named company.

[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

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Financing Arrangements - Outstanding Financing Arrangements (Details) - USD ($) $ in Thousands			4 Months Ended	9 Months Ended	12 Months Ended
	May 15, 2023	Feb. 14, 2023	May 15, 2023	Sep. 30, 2023	Dec. 31, 2022	Aug. 16, 2018
Debt Instrument [Line Items]
Amount Outstanding				$ 80,000	$ 762,751
Amount Available				$ 420,000	0
Secured Debt | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage	100.00%
Senior Notes
Debt Instrument [Line Items]
Redemption percentage			100.00%
Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage	100.00%
Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage	100.00%
Barclays Facility | Line of Credit
Debt Instrument [Line Items]
Stated interest rate				3.42%
Amount Outstanding				$ 80,000
Amount Available				$ 420,000
Barclays Facility | Line of Credit | Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Debt instrument, variable rate floor				0.00%
JPMorgan Facility | Line of Credit
Debt Instrument [Line Items]
Amount Outstanding					305,676
Amount Available					$ 0
Debt instrument, variable rate floor		0.00%
JPMorgan Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate		3.00%			3.00%
Debt instrument, variable rate floor					0.00%
JPMorgan Facility | Line of Credit | Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Debt instrument, variable rate floor				0.00%
Senior Secured Notes | Secured Debt
Debt Instrument [Line Items]
Stated interest rate					7.50%	7.50%
Amount Outstanding					$ 457,075
Amount Available					0
Fair value					$ 458,908

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Financing Arrangements - Interest Expense (Details) - USD ($) $ in Thousands		4 Months Ended	9 Months Ended
	May 15, 2023	May 15, 2023	Sep. 30, 2023	Sep. 30, 2022
Short-Term Debt [Line Items]
Direct Interest Expense			$ 16,163	$ 35,839
Amortization of Deferred Financing Costs and Discount			2,903	5,155
Total Interest Expense			19,066	40,994
Secured Debt | Debt Instrument, Redemption, Period One
Short-Term Debt [Line Items]
Redemption percentage	100.00%
Senior Notes
Short-Term Debt [Line Items]
Redemption percentage		100.00%
Senior Notes | Debt Instrument, Redemption, Period One
Short-Term Debt [Line Items]
Redemption percentage	100.00%
Senior Notes | Debt Instrument, Redemption, Period Two
Short-Term Debt [Line Items]
Redemption percentage	100.00%
JPMorgan Facility | Line of Credit
Short-Term Debt [Line Items]
Direct Interest Expense			2,790	9,458
Amortization of Deferred Financing Costs and Discount			238	1,830
Total Interest Expense			3,028	11,288
Senior Secured Notes | Secured Debt
Short-Term Debt [Line Items]
Direct Interest Expense			12,760	26,381
Amortization of Deferred Financing Costs and Discount			2,540	3,325
Total Interest Expense			15,300	29,706
Barclays Facility | Line of Credit
Short-Term Debt [Line Items]
Direct Interest Expense			613	0
Amortization of Deferred Financing Costs and Discount			125	0
Total Interest Expense			$ 738	$ 0

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Financing Arrangements - Narrative (Details)				1 Months Ended	4 Months Ended	9 Months Ended		12 Months Ended
	Sep. 06, 2023 USD ($) subsidiary	May 15, 2023	Feb. 14, 2023 USD ($)	Sep. 30, 2023 USD ($)	May 15, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022	Aug. 16, 2018 USD ($)
Debt Instrument [Line Items]
Amount outstanding					$ 557,446,000		$ 770,774,000
Average outstanding		7.49%			7.49%		7.01%
Debt instrument, interest rate, effective percentage							6.93%
Number of finance subsidiaries | subsidiary	2
Barclays Facility | Secured Overnight Financing Rate
Debt Instrument [Line Items]
Average outstanding	3.00%
Barclays Facility | Secured Overnight Financing Rate | Minimum
Debt Instrument [Line Items]
Average outstanding	1.90%
Barclays Facility | Secured Overnight Financing Rate | Maximum
Debt Instrument [Line Items]
Average outstanding	4.20%
Senior Notes
Debt Instrument [Line Items]
Redemption percentage					100.00%
Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage		100.00%
Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage		100.00%
Line of Credit | JPMorgan Facility
Debt Instrument [Line Items]
Debt instrument, variable rate floor			0.00%
Principal amount outstanding			$ 305,676,000
Line of Credit | JPMorgan Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, variable rate floor								0.00%
Basis spread on variable rate			3.00%					3.00%
Line of Credit | JPMorgan Facility | Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Debt instrument, variable rate floor						0.00%
Line of Credit | Barclays Facility
Debt Instrument [Line Items]
Amount outstanding				$ 80,000,000
Average outstanding				11.03%		11.03%
Debt instrument, interest rate, effective percentage				8.90%		8.90%
Maximum aggregate purchase price	$ 500,000
Initial purchase price	80,000
Aggregate principal amount	80,000
Carrying amount	74,502,000
Deferred financing costs	$ 5,498,000			$ 5,373,000		$ 5,373,000
Stated interest rate				3.42%		3.42%
Line of Credit | Barclays Facility | Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Debt instrument, variable rate floor						0.00%
Secured Debt | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage		100.00%
Secured Debt | Senior Secured Notes
Debt Instrument [Line Items]
Principal amount outstanding									$ 500,000,000
Stated interest rate								7.50%	7.50%

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Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
Investment Company, Financial Highlights [Roll Forward]
Net asset value, beginning of period (in USD per Share)			$ 3.88			$ 3.59	$ 3.88	$ 3.59	$ 3.59
Results of operations
Net investment income (in USD per share)							0.12		0.16
Net realized gain (loss) and unrealized appreciation (depreciation) (in USD per share)							(0.30)		0.25
Net increase (decrease) in net assets resulting from operations (in USD per share)							(0.18)		0.41
Distribution Amount
Distributions from net investment income (in USD per share)							(0.06)		(0.12)
Net decrease in net assets resulting from shareholder distributions (in USD per share)	$ 0	$ (0.03)	$ (0.03)	$ (0.03)	$ (0.03)	$ (0.03)	(0.06)	$ (0.09)	(0.12)
Capital share transactions
Issuance of common shares (in USD per share)							0		0
Net increase (decrease) in net assets resulting from capital share transactions (in USD per share)							0		0
Net asset value, end of period (in USD per share)	$ 3.64						$ 3.64		$ 3.88
Shares outstanding, end of period (in shares)	455,506,234						455,506,234		451,465,673
Total return							(4.70%)		11.39%
Total return (without assuming reinvestment of distributions)							(4.64%)		11.29%
Ratio/Supplemental Data:
Net assets, end of period	$ 1,657,461	$ 1,679,723		$ 1,731,841			$ 1,657,461	$ 1,731,841	$ 1,753,748	$ 1,602,323	$ 1,791,255
Ratio of net investment income to average net assets							4.30%		4.02%
Ratio of total operating expenses to average net assets							4.60%		6.78%
Ratio of management fee offset to average net assets							(0.02%)		(0.15%)
Ratio of net operating expenses to average net assets							4.58%		6.63%
Ratio of interest expense to average net assets							1.47%		3.21%
Ratio of federal and state taxes to average net assets							0.17%		0.13%
Portfolio turnover							14.79%		16.15%
Total amount of senior securities outstanding, exclusive of treasury securities	$ 80,000						$ 80,000		$ 762,751
Asset coverage per unit	2172.00%						2172.00%		330.00%
Ratio of net investment income to average net assets if advisor had not agreement to offset management fee payable							4.28%		3.87%