0001508655 2024-02-15 2024-02-15 0001508655 false 8-K 2024-02-15 Sixth Street Specialty Lending, Inc. DE 001-36364 27-3380000 2100 McKinney Avenue Suite 1500 Dallas TX 75201 469 621-3001 false false false false Common Stock, par value $0.01 per share TSLX NYSE false