Debt

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Debt

7. Debt

Subscription Facility

On September 1, 2022, the Company entered into a revolving credit agreement (the “Subscription Facility”) with Wells Fargo Bank, National Association, as administrative agent (the “Administrative Agent”), letter of credit issuer, lead arranger, as a lender and aggregate commitments under the facility were $400 million.

Pursuant to an amendment to the Subscription Facility dated as of December 21, 2022 (the “Subscription Facility First Amendment”), the aggregate commitments under the Subscription Facility were upsized to $700 million. Pursuant to lender joinder agreements dated January 18, 2023 and January 27, 2023, the aggregate commitments under the Subscription Facility were upsized to $800 million and $850 million, respectively. Pursuant to lender joinder agreements dated March 28, 2023, the aggregate commitments

under the Subscription Facility were upsized to $1.3 billion. Pursuant to a lender joinder agreement dated April 27, 2023, the aggregate commitments under the Subscription Facility were upsized to $1.35 billion. Pursuant to a lender joinder agreement dated December 1, 2023 the aggregate commitments under the Subscription Facility were upsized to $1.5 billion (the “Maximum Commitment”). On July 3, 2024, the Company exercised its option to extend the stated maturity date to August 29, 2025. Pursuant to the second amendment to the Subscription Facility dated as of August 29, 2025 (the “Subscription Facility Second Amendment”), the aggregate commitments under the Subscription Facility were reduced to $500 million and the stated maturity date was extended to August 28, 2026.

Borrowings under the Subscription Facility bear interest, at our election at the time of drawdown, at a rate per annum equal to (i) in the case of loans denominated in dollars, at our option (a) an adjusted Daily Simple SOFR rate plus 1.80%, (b) an adjusted Term SOFR rate for the applicable interest period plus 1.80% and (c) in the case of reference rate loans, 0.80% plus the greatest of (1) a prime rate, (2) the federal funds rate plus 0.50% and (3) the adjusted Daily Simple SOFR plus 1.00%, (ii) in the case of loans denominated in euros or other alternative currencies (other than sterling), the adjusted Eurocurrency Rate for the applicable interest period plus 1.80% or (iii) in the case of loans denominated in sterling, the adjusted SONIA rate plus 1.80%. SONIA loans are subject to a credit spread adjustment of 0.0326%. Loans denominated in dollars may be converted from one rate applicable to dollar denominated loans to another at any time at our election, subject to certain conditions. The Company also will pay an unused commitment fee of 0.25% per annum on the unused commitments.

The Company may borrow amounts in U.S. dollars or certain other permitted currencies. As of December 31, 2025, the Company had outstanding debt denominated in British pounds (GBP) of 10.3 million, and Euros (EUR) of 7.3 million on its Subscription Facility, included in the outstanding principal amount in the table below. As of December 31, 2024, we had outstanding debt denominated in British pounds (GBP) of 10.3 million, and Euros (EUR) of 7.3 million on the Subscription Facility included in the Outstanding Principal amount in the table below.

The amount available for borrowing under the Subscription Facility is reduced by any of letters of credit issued through the Subscription Facility. As of December 31, 2025 and December 31, 2024, the Company had no outstanding letters of credit issued through the Subscription Facility.

The Subscription Facility includes customary events of default, as well as customary covenants, including restrictions on certain distributions and financial covenants.

As of December 31, 2025, and December 31, 2024, the Company was in compliance with the terms of the Subscription Facility.

Revolving Credit Facility

On January 19, 2023, the Company entered into a senior secured revolving credit agreement (the “Revolving Credit Facility”) with Truist Bank, as administrative agent, JPMorgan Chase Bank, N.A., Royal Bank of Canada, State Street Bank and Trust Company and Wells Fargo Bank, N.A., as joint lead arrangers, and certain other lenders.

The aggregate commitments under the Revolving Credit Facility were $600 million and included an uncommitted accordion feature that allows the Company, under certain circumstances, to increase the size of the Revolving Credit Facility up to $1 billion. On February 28, 2023, the aggregate commitments under the Revolving Credit Facility were upsized to $700 million. On July 27, 2023, the aggregate commitments under the Revolving Credit Facility were upsized to $725 million. Pursuant to the first amendment to the Revolving Credit Facility dated February 8, 2024, the aggregate commitments under the Revolving Credit Facility were upsized to $1.0 billion and the stated maturity date was extended to February 8, 2029. On April 8, 2024, the aggregate commitments under the Revolving Credit Facility were upsized to $1.2 billion. On May 23, 2024, pursuant to the second amendment, the aggregate commitments under the Revolving Credit Facility were upsized to $1.375 billion, which included a term loan commitment of $100 million, due at the stated maturity. On June 27, 2024, the aggregate commitments under the Revolving Credit Facility were upsized to $1.425 billion. On December 18, 2024, the aggregate commitments under the Revolving Credit Facility were upsized to $1.55 billion, which included a term loan commitment of an additional $50 million, due at the stated maturity. On January 17, 2025, the aggregate commitments under the Revolving Credit Facility were upsized to $1.65 billion, due at the stated maturity. On March 4, 2025, pursuant to the third amendment, the aggregate commitments under the Revolving Credit Facility were upsized to $2.28 billion and the stated maturity was extended to March 4, 2030. On August 26, 2025, the aggregate commitments under the Revolving Credit Facility were upsized to $2.425 billion, which included a term loan commitment of an additional $50 million, due at the stated maturity. On September 23, 2025, pursuant to the fourth amendment, the aggregate commitments under the Revolving Credit Facility were upsized to $2.675 billion, due at the stated maturity. The Revolving Credit Facility includes an uncommitted accordion feature that allows the Company, under certain circumstances, to increase the size of the Revolving Credit Facility to up to $3.42 billion. The Revolving Credit Facility will mature on March 4, 2030.

Borrowings under the Revolving Credit Facility, including amounts drawn in respect of letters of credit, bear interest, at our election at the time of drawdown, at a rate per annum equal to (i) in the case of loans denominated in dollars, at our option (a) adjusted

Term SOFR plus 1.525%, 1.65% or 1.775%, based on certain borrowing base conditions and (b) an alternative base rate plus 0.525%, 0.65% or 0.775%, based on certain borrowing base conditions, (ii) in the case of loans denominated in other permitted currencies at the relevant rate specified plus 0.525%, 0.65% or 0.775%, based on certain borrowing base conditions, plus in the case of amounts denominated in certain other permitted currencies, an adjustment. We also will pay an unused commitment fee of 0.325% per annum on the unused commitments.

The Revolving Credit Facility is guaranteed by Sixth Street LP Holding II, LLC and SSLP Lending, LLC. The Revolving Credit Facility is secured by a perfected first-priority security interest in substantially all the portfolio investments held by us and each guarantor. Proceeds from borrowings may be used for general corporate purposes, including the funding of portfolio investments.

The Revolving Credit Facility includes customary events of default, as well as customary covenants, including restrictions on certain distributions and financial covenants. In accordance with the terms of the Revolving Credit Agreement, the financial covenants require:

•an asset coverage ratio of no less than 2 to 1 on the last day of any fiscal quarter;

•shareholders’ equity of at least $2.42 billion plus 25% of the net proceeds of the sale of equity interests after March 4, 2025; and

•minimum asset coverage ratio of no less than 1.5 to 1 with respect to (i) the consolidated assets of the Company and the subsidiary guarantors (including certain limitations on the contribution of equity in financing subsidiaries) to (ii) the secured debt of the Company and its subsidiary guarantors (the “Obligor Asset Coverage Ratio”).

The Revolving Credit Facility also contains certain additional concentration limits in connection with the calculation of the borrowing base, based on the Obligor Asset Coverage Ratio.

The Company may borrow amounts in U.S. dollars or certain other permitted currencies. As of December 31, 2025, the Company had outstanding debt denominated in British pounds (GBP) of 244.7 million, Canadian dollars (CAD) of 142.0 million, Euros (EUR) of 974.5 million and Swedish Krona (SEK) of 218.0 million on its Revolving Credit Facility, included in the outstanding principal amount in the table below. As of December 31, 2024, the Company had outstanding debt denominated in British pounds (GBP) of 299.2 million, Euros (EUR) of 640.1 million and Swedish Krona (SEK) of 80.2 million on its Revolving Credit Facility, included in the outstanding principal amount in the table below.

The Revolving Credit Facility also provides for the issuance of letters of credit up to an aggregate amount of $100 million. As of December 31, 2025 and 2024, the Company had $32.0 million and $5.9 million, respectively, in outstanding letters of credit issued through the Revolving Credit Facility. The amount available for borrowing under the Revolving Credit Facility is reduced by any letters of credit issued through the Revolving Credit Facility.

The Revolving Credit Facility includes customary events of default (with customary cure and notice provisions).

As of December 31, 2025, and December 31, 2024, the Company was in compliance with the terms of the Revolving Credit Facility.

2029 Notes

In March 2024, the Company issued $600 million aggregate principal amount of unsecured notes that mature on March 11, 2029 (the “2029 Notes”). The principal amount of the 2029 Notes is payable at maturity. The 2029 Notes bear interest at a rate of 6.50% per year, payable semi-annually commencing on September 11, 2024, and may be redeemed in whole or in part at the Company’s option at any time at par plus a “make whole” premium. Total proceeds from the issuance of the 2029 Notes, net of underwriting discounts, offering costs and original issue discount, were $586.0 million. The Company used the net proceeds of the 2029 Notes to repay outstanding indebtedness under the Revolving Credit Facility and Subscription Facility.

In June 2024, the Company issued an additional $150 million aggregate principal amount of unsecured notes that mature on March 11, 2029. The additional 2029 Notes are a further issuance of, fungible with, rank equally in right of payment with and have the same terms (other than the issue date and the public offering price) as the initial issuance of the 2029 Notes. Total proceeds from the issuance of the additional 2029 Notes, net of underwriting discounts, offering costs and original issue premium were $147.8 million. The Company used the net proceeds of the 2029 Notes to repay outstanding indebtedness under the Revolving Credit Facility and Subscription Facility.

The Company entered into two interest rate swaps to align the interest rates of its liabilities with the Company’s investment portfolio, which consists of predominately floating rate loans. The notional amount of the two interest rates swaps is $600.0 million

and $150.0 million, respectively, each of which matures on March 11, 2029, matching the maturity date of the 2029 Notes. As a result of the swap, the Company’s effective interest rate on the 2029 Notes is SOFR plus 2.45% (on a weighted average basis). The interest expense related to the 2029 Notes is offset by proceeds received from the interest rate swaps designated as a hedge. The swap adjusted interest expense is included as a component of interest expense on the Company’s Consolidated Statements of Operations. As of December 31, 2025 and December 31, 2024, the effective hedge interest rate swaps had a fair value of $15.1 million and $(1.1) million, respectively, which is offset within interest expense by an equal, but opposite, fair value change for the hedged risk on the 2029 Notes.

January 2030 Notes

In September 2024, the Company issued $600 million aggregate principal amount of unsecured notes that mature on January 15, 2030 (the “January 2030 Notes”). The principal amount of the January 2030 Notes is payable at maturity. The January 2030 Notes bear interest at a rate of 5.75% per year, payable semi-annually commencing on January 15, 2025, and may be redeemed in whole or in part at the Company’s option at any time at par plus a “make whole” premium. Total proceeds from the issuance of the January 2030 Notes, net of underwriting discounts, offering costs and original issue discount, were $591.7 million. The Company used the net proceeds of the January 2030 Notes to repay outstanding indebtedness under the Revolving Credit Facility and Subscription Facility.

In connection with the issuance of the January 2030 Notes, the Company entered into an interest rate swap to align the interest rate of its liability with the Company’s investment portfolio, which consists of predominately floating rate loans. The notional amount of the interest rate swap is $600.0 million which matures on January 15, 2030, matching the maturity date of the January 2030 Notes. As a result of the swap, the Company’s effective interest rate on the January 2030 Notes is SOFR plus 2.55%. The interest expense related to the January 2030 Notes is offset by proceeds received from the interest rate swaps designated as a hedge. The swap adjusted interest expense is included as a component of interest expense on the Company’s Consolidated Statements of Operations. As of December 31, 2025 and December 31, 2024, the effective hedge interest rate swaps had a fair value of $(5.2) million and $(24.1) million, respectively, which is offset within interest expense by an equal, but opposite, fair value change for the hedged risk on the January 2030 Notes.

July 2030 Notes

In January 2025, the Company issued $750 million aggregate principal amount of unsecured notes that mature on July 15, 2030 (the "July 2030 Notes"). The principal amount of the July 2030 Notes is payable at maturity. The July 2030 Notes bear interest at a rate of $6.125% per year, payable semi-annually commencing on July 15, 2025, and may be redeemed in whole or in part at the Company's option at anytime at par plus a "make whole" premium. Total proceeds from the issuance of the July 2030 Notes, net of underwriting discounts, offering costs and original issue discount, were $737.6 million. The Company used the net proceeds of the July 2030 Notes to repay outstanding indebtedness under the Revolving Credit Facility and Subscription Facility.

In connection with the issuance of the July 2030 Notes, the Company entered into an interest rate swap to align the interest rate of its liability with the Company's investment portfolio, which consists of predominately floating rate loans. The notional amount of the interest rate swap is $750.0 million which matures on July 15, 2030, matching the maturity date of the July 2030 Notes. As a result of the swap, the Company's effective interest rate on the July 2030 Notes is SOFR plus 2.01%. The interest expense related to the July 2030 Notes is offset by proceeds received from the interest rate swaps designed as a hedge. The swap adjusted interest expense is included as a component of interest expense on the Company's Consolidated Statements of Operations. As of December 31, 2025, the effective hedge interest rate swaps had a fair value of $21.0 million which is offset within interest expense by an equal, but opposite, fair value change for the hedged risk on the July 2030 Notes.

For the years ended December 31, 2025 and December 31, 2024, the components of interest expense related to the 2029 Notes, January 2030 Notes and July 2030 Notes were as follows:

	For the Year Ended
	December 31, 2025		December 31, 2024
Interest expense	$	127,656	$	46,734
Accretion of original issue discount		2,125		965
Amortization of deferred financing costs		5,184		1,941
Total Interest Expense	$	134,965	$	49,640

Total interest expense in the table above does not include the effect of the interest rate swaps related to the 2029 Notes, January 2030 Notes and July 2030 Notes. During the years ended December 31, 2025 and December 31, 2024, the Company received $126.9 million and $45.3 million, respectively, and paid $137.9 million and $55.1 million, respectively, related to the settlements of its interest expense in the Company's Consolidated Statement of Operations. See Note 5 for further information about the Company's interest rate swap.

As of December 31, 2025, the components of the carrying value and the stated interest rates of the 2029 Notes, January 2030 Notes and July 2030 Notes were as follows:

	December 31, 2025
	2029 Notes			January 2030 Notes			July 2030 Notes
Principal amount of debt	$	750,000		$	600,000		$	750,000
Original issue discount, net of accretion		(4,475	)		(749	)		(4,152	)
Deferred financing costs		(6,497	)		(5,817	)		(8,273	)
Fair value of an effective hedge		15,141			(5,161	)		20,952
Carrying value of debt	$	754,169		$	588,273		$	758,527
Stated interest rate		6.50	%		5.75	%		6.13	%

The stated interest rate in the tables above do not include the effect of the interest rate swaps. As of December 31, 2025, the Company's swap-adjusted interest rate on the 2029 Notes, January 2030 Notes and July 2030 Notes was SOFR plus 2.45% (on a weighted average basis), 2.55% and 2.01%, respectively.

As of December 31, 2024, the components of the carrying value and the stated interest rates of the 2029 Notes and January 2030 Notes were as follows:

	December 31, 2024
	2029 Notes			January 2030 Notes
Principal amount of debt	$	750,000		$	600,000
Original issue discount, net of accretion		(5,695	)		(909	)
Deferred financing costs		(8,486	)		(7,680	)
Fair value of an effective hedge		(1,079	)		(24,135	)
Carrying value of debt	$	734,740		$	567,276
Stated interest rate		6.50	%		5.75	%

The stated interest rate in the tables above do not include the effect of the interest rate swaps. As of December 31, 2024, the Company's swap-adjusted interest rate on the 2029 Notes and January 2030 Notes was SOFR plus 2.45% (on a weighted average basis) and 2.55%, respectively.

As of December 31, 2025, the Company was in compliance with the terms of the indentures governing the 2029 Notes, the January 2030 Notes and the July 2030 Notes. As of December 31, 2024, the Company was in compliance with the terms of the indentures governing the 2029 Notes and the January 2030 Notes.

In accordance with the 1940 Act, with certain limitations, the Company is allowed to borrow amounts such that its asset coverage, as defined in the 1940 Act, is at least 150% after such borrowing. As of December 31, 2025 and December 31, 2024, the Company’s asset coverage was 200.8% and 193.0%, respectively.

Debt obligations consisted of the following as of December 31, 2025 and December 31, 2024:

	December 31, 2025
	Aggregate Principal Amount Committed		Outstanding Principal		Amount Available (1)		Carrying Value (2)(3)
Subscription Facility	$	500,000	$	22,428	$	477,572	$	21,469
Revolving Credit Facility		2,675,000		2,025,883		617,129		2,010,387
2029 Notes		750,000		750,000		—		754,169
January 2030 Notes		600,000		600,000		—		588,273
July 2030 Notes		750,000		750,000		—		758,527
Total Debt	$	5,275,000	$	4,148,311	$	1,094,701	$	4,132,825

(1)The amount available may be subject to limitations related to the borrowing base under the Subscription Facility, Revolving Credit Facility, outstanding letters of credit issued and asset coverage requirements.

(2)The carrying values of the Subscription Facility, Revolving Credit Facility, 2029 Notes, January 2030 Notes and July 2030 Notes are presented net of the combination of deferred financing costs and original issue discounts totaling $1.0 million, $15.5 million, $11.0 million, $6.6 million and $12.4 million, respectively.

(3)The carrying value of the 2029 Notes, January 2030 Notes and July 2030 Notes are presented inclusive of an incremental $15.1 million, $(5.2) million and $21.0 million, respectively, which represents an adjustment in the carrying value of the 2029 Notes, January 2030 Notes and July 2030 Notes, resulting from a hedge accounting relationship.

	December 31, 2024
	Aggregate Principal Amount Committed		Outstanding Principal		Amount Available (1)		Carrying Value (2)(3)
Subscription Facility	$	1,500,000	$	1,496,759	$	3,241	$	1,493,740
Revolving Credit Facility		1,550,000		1,501,965		42,095		1,492,845
2029 Notes		750,000		750,000		—		734,740
January 2030 Notes		600,000		600,000		—		567,276
Total Debt	$	4,400,000	$	4,348,724	$	45,336	$	4,288,601

(1)The amount available may be subject to limitations related to the borrowing base under the Subscription Facility, the Revolving Credit Facility, outstanding letters of credit issued, and asset coverage requirements.

(2)The carrying values of the Subscription Facility, Revolving Credit Facility, 2029 Notes and January 2030 Notes are presented net deferred financing costs $3.0 million, $9.1 million, $14.2 million, and $8.6 million, respectively.

(3)The carrying value of the 2029 Notes and January 2030 Notes are presented inclusive of an incremental $(1.1) million and $(24.1) million, respectively, which represents an adjustment in the carrying value of the 2029 Notes and January 2030 Notes, resulting from a hedge accounting relationship.

For the years ended December 31, 2025, December 31, 2024 and December 31, 2023, the components of interest expense were as follows:

	For the Year Ended
	December 31, 2025			December 31, 2024			December 31, 2023
Interest expense		202,877		$	169,790			64,118
Commitment fees		5,968			3,175			3,022
Amortization of deferred financing costs		11,900			8,301			5,216
Accretion of original issue discount		2,125			966			—
Swap settlement		11,030			9,757			—
Total Interest Expense	$	233,900		$	191,989		$	72,356
Average debt outstanding (in millions)	$	3,687.3		$	2,519.0		$	876.9
Weighted average interest rate		5.8	%		7.1	%		7.3	%