X0407 4 2023-04-25 0 0001163302 UNITED STATES STEEL CORP X 0001625756 MASCARENAS PAUL ANTHONY 600 GRANT STREET PITTSBURGH PA 15219 1 0 0 0 0 United States Steel Corporation Common Stock 2023-04-25 4 F 0 29 24.39 D 65194.685 D United States Steel Corporation Common Stock 2023-04-25 4 A 0 3691 0.00 A 68885.685 D United States Steel Corporation Common Stock 2023-04-25 4 A 0 3691 0.00 A 72576.685 D This line reflects the tax withholding on the vesting of RSUs granted on April 26, 2022, under the Corporation's Non-Employee Director Compensation Policy. Represents shares awarded pursuant to the Corporation's Non-Employee Director Compensation Policy through a transaction exempt under Rule 16b-3. Restricted stock units vest on the earlier of (i) the anniversary of the grant date and (ii) the date of the next Annual Meeting of Stockholders. RSUs are payable in stock. Represents shares awarded pursuant to the Corporation's Deferred Compensation Program for Non-Employee Directors through a transaction exempt under Rule 16b-3. Deferred stock units vest on the earlier of (i) the first anniversary of the grant date and (ii) the next annual meeting of stockholders, and remain deferred until retirement from the Board of Directors. /s/ Megan Bombick, By Power of Attorney from Paul A. Mascarenas 2023-04-27