X0306 4 2018-02-20 0 0001018963 ALLEGHENY TECHNOLOGIES INC ATI 0001594792 DeCourcy Patrick J 1000 SIX PPG PLACE PITTSBURGH PA 15222 0 1 0 0 Senior VP, Finance and CFO Common Stock, $0.10 par value per share 2018-02-20 4 D 0 5923.478 0.00 D 83402.1731 D Common Stock, $0.10 par value per share 2018-02-20 4 A 0 11221 0.00 A 94623.1731 D Forfeiture of restricted shares, including accumulated dividends, granted under the 2015 Long-Term Shareholder Value Program. Award of restricted stock units, which are settled in shares of stock upon vesting. The award vests in three equal annual installments on each of the first three anniversaries of the grant date. /s/ Elliot S. Davis, Attorney-in-Fact for Patrick J. DeCourcy 2018-02-22