0001508655 2026-05-14 2026-05-14 iso4217:USD false 0001508655 TX 8-K 2026-05-14 Sixth Street Specialty Lending, Inc. DE 001-36364 27-3380000 2100 McKinney Avenue Suite 1500 Dallas 75201 469 621-3001 false false false false Common Stock, par value $0.01 per share TSLX NYSE false On May 14, 2026, Sixth Street Specialty Lending, Inc. (the “Company”) and U.S. Bank Trust Company, National Association (the “Trustee”), entered into a Third Supplemental Indenture (the “Third Supplemental Indenture”) to the Indenture, dated as of January 16, 2024, between the Company and the Trustee (the “Base Indenture”; and together with the Third Supplemental Indenture, the “Indenture”), relating to the Company’s issuance, offer and sale of $300,000,000 aggregate principal amount of its 5.650% notes due 2031 (the “Notes”). 300000000 5.650% notes due 2031 The Notes will mature on August 15, 2031 and may be redeemed in whole or in part at the Company’s option at any time at the redemption prices set forth in the Third Supplemental Indenture. The Notes bear interest at a rate of 5.650% per year payable semiannually on February 15 and August 15 of each year, commencing on February 15, 2027. The Company expects to use the net proceeds of this offering to pay down debt under its revolving credit facility and for general corporate purposes, including making new investments in accordance with the Company’s investment objective and strategies. The Indenture contains certain covenants including covenants requiring the Company to comply with Section 18(a)(1)(A) as modified by Section 61(a) of the Investment Company Act of 1940, as amended, or any successor provisions, but giving effect, in either case, to any exemptive relief granted to the Company by the SEC, and to provide financial information to the holders of the Notes and the Trustee if the Company should no longer be subject to the reporting requirements under the Securities Exchange Act of 1934. These covenants are subject to important limitations and exceptions that are described in the Indenture.