Sixth Street Specialty Lending, Inc.

For the period ended Dec 31, 2025. Filed Feb 12, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 12, 2026

TSLX$17.75-1.1%Stored close · as of Nov 10, 2026

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Contents

Item 15. Exhibits and Financial Statement Schedules

The following documents are filed as part of this Annual Report:

(1)

Financial Statements—Financial statements are included in Item 8. See the Index to the consolidated financial statements on page F-1 of this annual report on Form 10-K.

(2)

Financial Statement Schedules—None. We have omitted financial statements schedules because they are not required or are not applicable, or the required information is shown in the consolidated financial statements or notes to the consolidated financial statements included in this annual report on Form 10-K.

(3)

Exhibits—The following is a list of all exhibits filed as a part of this annual report on Form 10-K, including those incorporated by reference.

Exhibit No	Description of Exhibits
3.1	Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.2 to Amendment No. 1 to the Company’s Current Report on Form 8-K filed on June 19, 2020).
3.2	Third Amended and Restated Bylaws dated November 4, 2025 (incorporated by reference to Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q filed on November 4, 2025).
4.1	Form of Common Stock Certificate (incorporated by reference to Exhibit 4.2 to the Company’s Annual Report on Form 10-K filed on March 22, 2012).
4.2	Third Supplemental Indenture, dated as of February 3, 2021, between Sixth Street Specialty Lending, Inc. and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on February 3, 2021).
4.3	Form of 2.500% Note (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on February 3, 2021).
4.4	Fourth Supplemental Indenture, dated as of August 14, 2023, between Sixth Street Specialty Lending, Inc. and Computershare Trust Company, N.A., as successor to Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on August 14, 2023).
4.5	Form of 6.950% Note Due 2028 (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on August 14, 2023).
4.6	Indenture, dated as of January 16, 2024, between Sixth Street Specialty Lending, Inc. and U.S. Bank Trust Company, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on January 16, 2024).
4.7	First Supplemental Indenture, dated as of January 16, 2024, between Sixth Street Specialty Lending, Inc. and U.S. Bank Trust Company, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K filed on January 16, 2024).
4.8	Form of 6.125% Note Due 2029 (included in Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on January 16, 2024).
4.9	Second Supplemental Indenture, dated as of February 25, 2025, between Sixth Street Specialty Lending, Inc. and U.S. Bank Trust Company, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on February 25, 2025).
4.10	Form of 5.625% Note Due 2030 (included in Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on February 25, 2025 and incorporated by reference).
4.11	Description of Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (incorporated by reference to Exhibit 4.8 to the Company’s Annual Report on Form 10-K filed on February 15, 2024).

Exhibit No	Description of Exhibits
10.1	Form of Indemnification Agreement between the Company and certain officers and directors (incorporated by reference to Exhibit 10.3 to Amendment No. 1 to the Company’s Registration Statement on Form 10 filed on March 14, 2011).
10.2	Amended and Restated Investment Advisory and Management Agreement, dated December 12, 2011, between the Company and the Adviser (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on December 13, 2011).
10.3	Custodian Agreement dated November 29, 2012 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on December 4, 2012).
10.4	Second Amended and Restated Senior Secured Credit Agreement, dated February 27, 2014, among TPG Specialty Lending, Inc., as Borrower, the Lenders Party Hereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent, and JPMorgan Chase Bank, N.A., as Syndication Agent (incorporated by reference to Exhibit 10.20 to the Company’s Annual Report on Form 10-K filed on March 4, 2014).
10.5	Dividend Reinvestment Plan of TPG Specialty Lending, Inc. (incorporated by reference to Exhibit (e) to Pre-Effective Amendment No. 4 to the Company’s Registration Statement on Form N-2 filed on March 17, 2014).
10.6	Form of Increase Letter pursuant to the Second Amended and Restated Senior Secured Credit Agreement, dated February 27, 2014, among TPG Specialty Lending, Inc., as Borrower, the Lenders Party Hereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent, and JPMorgan Chase Bank, N.A., as Syndication Agent (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Annual Report on Form 10-Q filed on August 4, 2014).
10.7	First Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated June 3, 2014, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent and Collateral Agent (incorporated by reference to Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q filed on August 4, 2014).
10.8	Second Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated June 27, 2014, among TPG Specialty Lending, Inc., as Borrower, Morgan Stanley Bank, N.A., as a Lender, and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q filed on August 4, 2014).
10.9	Third Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated October 17, 2014, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed on November 3, 2014).
10.10	Second Amended and Restated Credit and Security Agreement, dated as of March 27, 2015, among TPG SL SPV, LLC, as Borrower, the Lenders from time to time parties thereto, Natixis, New York Branch, as Facility Agent and State Street Bank and Trust Company, as Collateral Agent (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on March 30, 2015).
10.11	Fourth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated October 2, 2015, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed on November 3, 2015).
10.12	Fifth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated December 22, 2016, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.15 to the Company’s Annual Report on Form 10-K filed on February 22, 2017).
10.13	Amended and Restated Administration Agreement, dated as of February 22, 2017 between the Company and the Adviser (incorporated by reference to Exhibit 10.16 to the Company’s Annual Report on Form 10-K filed on February 22, 2017).
10.14	Sixth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated February 20, 2018, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.16 to the Company’s Annual Report on Form 10-K filed on February 21, 2018).

Exhibit No	Description of Exhibits
10.15	Seventh Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of November 5, 2018, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed on November 6, 2018).
10.16	Eighth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of February 14, 2019, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent. (incorporated by reference to Exhibit 10.16 to the Company’s Annual Report on Form 10-K filed on February 20, 2019).
10.17	Ninth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of January 31, 2020, among TPG Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent. (incorporated by reference to Exhibit 10.17 to the Company’s Annual Report on Form 10-K filed on February 19, 2020).
10.18	Tenth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of February 5, 2021, among Sixth Street Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.18 to the Company’s Annual Report on Form 10-K filed on February 17, 2021).
10.19	Eleventh Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of December 21, 2021, among Sixth Street Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.19 to the Company’s Annual Report on Form 10-K filed on February 17, 2022).
10.20	Twelfth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of April 25, 2022, among Sixth Street Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed on May 5, 2022).
10.21	Thirteenth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of May 19, 2022, among Sixth Street Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q filed on August 2, 2022).
10.22	Fourteenth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of June 12, 2023, among Sixth Street Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed on August 3, 2023).
10.23	Fifteenth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of April 24, 2024, among Sixth Street Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed on July 31, 2024).
10.24	Sixteenth Amendment to Second Amended and Restated Senior Secured Revolving Credit Agreement, dated as of March 4, 2025, among Sixth Street Specialty Lending, Inc., as Borrower, the Lenders party thereto and Truist Bank (as successor by merger to SunTrust Bank), as Administrative Agent (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q filed on April 30, 2025).
10.25	Form of Equity Distribution Agreement, dated as of February 28, 2025, by and among Sixth Street Specialty Lending, Inc., Sixth Street Specialty Lending Advisers, LLC and the sales agent party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on February 28, 2025).
19.1	Sixth Street Specialty Lending, Inc.’s Statement of Policy on Insider Trading (incorporated by reference to the Exhibit 19.1 to the Company's Annual Report on Form 10-K filed on February 13, 2025).
21.1	Subsidiaries of Sixth Street Specialty Lending, Inc.

Exhibit No	Description of Exhibits
23.1	Consent of Independent Registered Public Accounting Firm
31.1	Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32	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.
97.1	Incentive Compensation Clawback Policy (incorporated by reference to Exhibit 97.1 to the Company’s Annual Report on Form 10-K filed on February 15, 2024).
99.1	Report of Independent Registered Public Accounting Firm on Supplemental Information.
101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

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