X0306 4 2016-11-28 0 0001163302 UNITED STATES STEEL CORP X 0001308357 Filho Mario Longhi 600 GRANT STREET, 61ST FLOOR PITTSBURGH PA 15219 1 1 0 0 President & CEO Common Stock 2016-11-28 4 M 0 176040 25.00 A 492276 D Common Stock 2016-11-28 4 S 0 176040 32.25 D 316236 D Common Stock 2016-11-28 4 M 0 101160 24.285 A 417396 D Common Stock 2016-11-28 4 S 0 101160 32.24 D 316236 D Common Stock 9196 I By Trust Common Stock 4586.861 I By 401(k) Common Stock 25.00 2016-11-28 4 M 0 176040 0.00 D 2016-09-01 2023-09-01 Common Stock 176040 0 D Common Stock 24.285 2016-11-28 4 M 0 101160 0.00 D 2016-05-27 2024-05-27 Common Stock 101160 50580 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.56, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes 1 and 2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions ranging in price from $32.00 to $32.46, inclusive. The options vested in three equal installments on Sept. 1, 2014, 2015 and 2016. The options vest in three equal installments on May 27, 2015, 2016 and 2017. /s/ Arden T. Phillips by Power of Attorney 2016-11-30