X0306 4 2019-02-26 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 Common Stock 2019-02-26 4 A 0 13380 0.00 A 59518 D Common Stock 2019-02-26 4 F 0 3827 23.92 D 55691 D Common Stock 2019-02-26 4 A 0 20900 0.00 A 76591 D Common Stock 2019-02-27 4 F 0 664 24.06 D 75927 D Common Stock 2161.886 I By 401(k) Plan This line represents performance-based restricted stock units (RSUs) that were granted on February 22, 2016 and vested on February 26, 2019. 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 RSUs that were granted on February 22, 2016. 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 tax withholding on the vesting RSUs that were granted on February 27, 2018. RSUs vest ratably over a three year period. /s/ Megan Bombick by Power of Attorney 2019-02-28