CEO Brian E. Lane Forfeits 3,599 Shares of Comfort Systems USA Stock at $1,429.60 Per Share

This Form 4 filing reports that Brian E. Lane, CEO and Director of Comfort Systems USA Inc., forfeited a total of 3,599 shares of common stock on April 1, 2026. The forfeitures were related to restricted stock units (RSUs) that vested on that date. Specifically, Lane forfeited 1,146 shares from RSUs granted on March 19, 2025 (first vesting), 941 shares from RSUs granted on March 20, 2024 (second vesting), and 1,512 shares from RSUs granted on March 21, 2023 (third and final vesting). All shares were disposed at a price of $1,429.595 per share, which represents the average of the high and low stock price on April 1, 2026. Following these transactions, Lane's direct ownership decreased from 174,655 shares to 172,202 shares. The filing was signed by Rachel R. Eslicker as Attorney-in-Fact on April 3, 2026.