X0306 4 2017-02-28 0 0001163302 UNITED STATES STEEL CORP X 0001204586 BURRITT DAVID B 600 GRANT STREET PITTSBURGH PA 15219 0 1 0 0 Exec. VP and CFO Common Stock 2017-02-28 4 A 0 51165 0.00 A 183278 D Common Stock 2017-02-28 4 F 0 24606 39.27 D 158672 D Common Stock 2017-02-28 4 A 0 14010 0.00 A 172682 D Common Stock 6760.05 I By 401(k) plan Common Stock Option 39.27 2017-02-28 4 A 0 30020 0.00 A 2027-02-28 Common Stock 30020 30020 D This line represents performance-based restricted stock units (RSUs) that were granted on February 25, 2014 and vested on February 28, 2017. Performance awards vest depending upon the performance of U. S. Steel's common stock performance vs. that of a peer group over a three-year period. This line reflects the tax withholding on the vesting of performance based restricted stock units (RSUs) that were granted on February 25, 2014. This line reflects the grant of RSUs. RSUs vest ratably over three years, one-third on each of the first, second and third grant date anniversaries. RSUs are payable in stock only. This line reflects the grant of stock options to purchase U. S. Steel common stock. Option grants vest ratably over three years, one-third on each of the first, second and third grant date anniversaries. /s/ Arden T. Phillips by power of attorney 2017-03-02