X0306 4 2021-01-04 0 0001018963 ALLEGHENY TECHNOLOGIES INC ATI 0001332656 Powers Elizabeth C 1000 SIX PPG PLACE PITTSBURGH PA 15222 0 1 0 0 Senior VP, CHRO Common Stock, par value $0.10 per share 2021-01-04 4 A 0 40431 0.00 A 148594.8309 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. This amount includes 1,923.024448 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,611 units, which represent interests in the Company's stock fund. /s/ Elliot S. Davis, Attorney-in-Fact for Elizabeth C. Powers 2021-01-06