Sixth Street Specialty Lending(TSLX) - 2025 Q2 - Quarterly Results

Exhibit 99.1 K SECOND QUARTER 2025 EARNINGS RESULTS Sixth Street Specialty Lending, Inc. Reports Second Quarter Results; Declares a Third Quarter Base Dividend Per Share of $0.46, and a Second Quarter Supplemental Dividend Per Share of $0.05. NEW YORK — July 30, 2025 — Sixth Street Specialty Lending, Inc. (NYSE: TSLX, or the "Company") today reported net investment income of $0.54 per share and net income of $0.63 per share for the second quarter ended June 30, 2025. These results correspond to an annualize ...