X0306 4 2019-05-06 0 0001018963 ALLEGHENY TECHNOLOGIES INC ATI 0001773072 Fields Kimberly A C/O ALLEGHENY TECHNOLOGIES INCORPORATED 1000 SIX PPG PLACE PITTSBURGH PA 15222 0 1 0 0 EVP, Flat Rolled Products Common Stock, $0.10 par value per share 2019-05-06 4 A 0 31471 24.89 A 31471 D Common Stock, $0.10 par value per share 2019-05-06 4 A 0 16070 24.89 A 47541 D 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. Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on March 6, 2019. Award of restricted stock units, which are settled in shares of stock upon vesting. The award vests on the third anniversary of the grant date. /s/: Amanda J. Skov, Attorney-in-Fact for Kimberly A. Fields 2019-05-08