References in this presentation ("Presentation") to "TSLX," "we," "us," "our" and "the Company" refer to Sixth Street Specialty Lending, Inc. EARNINGS PRESENTATION Quarter Ended June 30, 2025 This Presentation includes forward-looking statements about TSLX that involve substantial risks and uncertainties. These forward-looking statements are not historical facts, but rather are based on current expectations, estimates and projections about us, our current and prospective portfolio investments, our industry, ...

Financial Performance - Net Asset Value (NAV) per share decreased slightly from $17.16 at the end of Q4 2024 to $17.04 at the end of Q1 2025[11] - Net investment income per share remained stable at $0.62 for Q1 2025, consistent with Q4 2024[11] - Adjusted net investment income per share was $0.58 in Q1 2025[11] - The annualized Return on Equity (ROE) from Net Investment Income was 14.4% for Q1 2025[10, 11] - The annualized ROE from Adjusted Net Income was 8.3% for Q1 2025[10, 11] Portfolio Composition and Activity - The fair value of investments was $3.412 billion as of March 31, 2025[8, 12, 13] - The portfolio consisted of 115 companies with an average investment size of $29.7 million[10] - First-lien debt investments accounted for 93% of the portfolio[10, 12, 23, 24] - Floating rate investments represented 97% of the portfolio[10, 12] - New investment commitments totaled $154.4 million in Q1 2025[12, 19, 20, 21] - Net repayment activity was $132.9 million in Q1 2025[21] Liquidity and Capital Structure - The company had approximately $1.013 billion of undrawn capacity on its revolving credit facility[10, 41] - Available liquidity was 5.8x greater than unfunded investment commitments[41] - Leverage at quarter-end was 1.18x, within the target range of 0.90x – 1.25x[10, 11, 13]