Sixth Street Specialty Lending : Material Event - Form 8-K

8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 7, 2023

Sixth Street Specialty Lending, Inc.

(Exact name of registrant as specified in charter)

Delaware		001-36364		27-3380000
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

2100 McKinney Avenue, Suite 1500 Dallas, TX		75201
(Address of Principal Executive Offices)		(zip code)

Registrant's telephone number, including area code: [phone]

Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencementcommunications pursuant to Rule 14d-2(b)under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencementcommunications pursuant to Rule 13e-4(c)under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, par value $0.01 per share		TSLX		The New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2of the Securities Exchange Act of 1934 (§240.12b-2of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to 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. ☐

Item 8.01 - Other Events

On August 7, 2023, Sixth Street Specialty Lending, Inc. (the "Company") entered into an underwriting agreement (the "Underwriting Agreement") by and among the Company, Sixth Street Specialty Lending Advisers, LLC (the "Adviser") and BofA Securities, Inc., as representative of the several underwriters named in Schedule 1 thereto (the "Underwriters"), in connection with the issuance and sale of $300,000,000 aggregate principal amount of the Company's 6.950% Notes due 2028 (the "Offering").

The Offering was made pursuant to the Company's effective shelf registration statement on Form N-2(Registration No. 333-269222)previously filed with the Securities and Exchange Commission, as supplemented by a preliminary prospectus supplement dated August 7, 2023 and a final prospectus supplement dated August 7, 2023.

The foregoing description of the Underwriting Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Underwriting Agreement filed with this report as Exhibit 1.1 and which is incorporated herein by reference.

Item 9.01 - Financial Statements and Exhibits

(d) Exhibits:

Exhibit Number		Description
1.1		Underwriting Agreement, dated August 7, 2023, by and among the Company, the Adviser and the Underwriters.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

		SIXTH STREET SPECIALTY LENDING, INC. (Registrant)
Date: August 10, 2023			By:		/s/ Ian Simmonds
			Ian Simmonds
			Chief Financial Officer