X0609 4 2026-05-11 0001508655 Sixth Street Specialty Lending, Inc. TSLX 0002112742 Bruck Ross Anthony false C/O SIXTH STREET SPECIALTY LENDING, INC. 2100 MCKINNEY AVENUE, SUITE 1500 DALLAS TX 75201 false true false false Vice President false Common Stock 2026-05-11 4 P false 8000 17.76 A 18250 D (1) Anton Brett is signing on behalf of Ross Bruck pursuant to a Power of Attorney dated February 20, 2026. /s/ Anton Brett, attorney-in fact (1) 2026-05-13