X0306 4 2017-02-23 0 0001018963 ALLEGHENY TECHNOLOGIES INC ATI 0001572385 WETHERBEE ROBERT S 1000 SIX PPG PLACE PITTSBURGH PA 15222 0 1 0 0 EVP, ATI Flat-Rolled Products Common Stock, $0.10 par value 2017-02-23 4 A 0 15741 0.00 A 77383.2449 D Common Stock, $0.10 par value 2017-02-27 4 F 0 2758 19.65 A 74625.2449 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. Shares withheld for payment of taxes on restricted stock units awarded on February 27, 2016. One-third of such restricted stock units vested by their terms on February 27, 2017. 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 February 27, 2017. /s/ Elliot S. Davis, Attorney-in-Fact for Robert S. Wetherbee 2017-02-27