X0306 4 2018-03-14 0 0001163302 UNITED STATES STEEL CORP X 0001509500 Bradley Kevin 600 GRANT STREET PITTSBURGH PA 15219 0 1 0 0 EVP & Chief Financial Officer Common Stock 2018-03-14 4 P 0 20000 39.988 A 83495.544 D Common Stock 2563.225 I By 401(k) plan The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.949 to $40.00, 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 this footnote. /s/ Megan Bombick by power of attorney 2018-03-16