X0306 4 2018-02-27 0 0001163302 UNITED STATES STEEL CORP X 0001626558 Bruno James E. 600 GRANT STREET PITTSBURGH PA 15219 0 1 0 0 Sr. VP - Automotive Solutions Common Stock 2018-02-27 4 A 0 3696 0.00 A 61860 D Common Stock 2018-02-27 4 F 0 1058 43.99 D 60802 D Common Stock 2018-02-27 4 A 0 6140 0.00 A 66942 D Common Stock 1879.541 I By 401(k) plan This line represents performance-based restricted stock units (RSUs) that were granted on February 24, 2015 and vested on February 27, 2018. 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 24, 2015. 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. /s/ Megan Bombick by power of attorney 2018-03-01