X0508 4 2023-12-20 0 0001163302 UNITED STATES STEEL CORP X 0001626558 Bruno James E. 600 GRANT STREET PITTSBURGH PA 15219 0 1 0 0 Sr. VP - European Solutions 0 United States Steel Corporation Common Stock 2023-12-20 4 F 0 4846 47.91 D 51702 D United States Steel Corporation Common Stock 2023-12-20 4 F 0 3590 47.91 D 48112 D United States Steel Corporation Common Stock 2023-12-20 4 A 0 45216 0.00 A 93328 D United States Steel Corporation Common Stock 2023-12-20 4 F 0 19624 47.91 D 73704 D United States Steel Corporation Common Stock 5793.364 I By 401(k) plan This line reflects the tax withholding on the vesting of restricted stock units (RSUs) that were granted in 2021. This line reflects the tax withholding on the vesting of RSUs that were granted in 2022. This line represents performance-based RSUs that were granted on February 23, 2021, and partially vested on December 20, 2023. The remaining 2021 ROCE-based performance awards vest, if at all, on February 27, 2024, based upon the satisfaction of performance criteria. This line reflects the tax withholding on the vesting of ROCE-based performance RSUs that vested on December 20, 2023. /s/ Megan Bombick, By Power of Attorney from James E. Bruno 2023-12-22