X0306 4 2021-01-04 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 2021-01-04 4 A 0 119796 0.00 A 311936.3409 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. /s/ Elliot S. Davis, Attorney-in-Fact for Robert S. Wetherbee 2021-01-06