X0306 4 2019-02-27 0 0001018963 ALLEGHENY TECHNOLOGIES INC ATI 0001572385 WETHERBEE ROBERT S 1000 SIX PPG PLACE PITTSBURGH PA 15222 0 1 0 0 President and CEO Common Stock, par value $0.10 per share 2019-02-27 4 A 0 30763 29.255 A 96866.3409 D Common Stock, par value $0.10 per share 2019-02-27 4 F 0 1842 29.255 D 95024.3409 D Common Stock, par value $0.10 per share 2019-02-28 4 M 0 23678 28.92 A 118702.3409 D Common Stock, par value $0.10 per share 2019-02-28 4 F 0 10367 28.92 D 108335.3409 D Award of restricted stock units granted on February 27, 2019, 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 February 27, 2019. Shares withheld for payment of taxes on performance/restricted stock granted in 2014 that vested on February 27, 2019. Settlement of performance-vested restricted stock units that were granted in 2016, the vesting of which was contingent upon the Issuer's achievement of specified performance criteria during the period from January 1, 2016 through December 31, 2018 (the "2016-2018 PSUs"). The Issuer's partial achievement of such performance criteria was certified, and a corresponding portion of the shares underlying the 2016-2018 PSUs became payable, as of February 28, 2019. 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 28, 2019. Shares withheld for payment of taxes in connection with the February 28, 2019 settlement of the 2016-2018 PSUs. /s/ Elliot S. Davis, Attorney-in-Fact for Robert S. Wetherbee 2019-03-01