Sixth Street Specialty Lending, Inc.

, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 and shall

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers . Resignation

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year. On November 4, 2025, the Board amended and restated the Company’s Bylaws, effective as

, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, and shall

Financial Statements and Exhibits (d) Exhibits: Exhibit Number Description 3.1 Third Amended and Restated Bylaws dated November 4, 2025 (incorporated by referen