X0508 4 2025-11-18 0001508655 Sixth Street Specialty Lending, Inc. TSLX 0001673990 Stanley Robert J. C/O SIXTH STREET SPECIALTY LENDING, INC. 2100 MCKINNEY AVENUE, SUITE 1500 DALLAS TX 75201 true true false false Co-CEO false Common Stock 2025-11-18 4 P false 10000 20.85 A 24907.27 D (1) Anton Brett is signing on behalf of Robert J. Stanley pursuant to a Power of Attorney dated November 18, 2025, which is attached hereto as an exhibit. Exhibit List Exhibit 24- Power of Attorney /s/ Anton Brett, on behalf of Robert J. Stanley (1) 2025-11-20