X0306 4 2021-09-13 0 0001675149 Alcoa Corp AA 0001758117 Reyes Timothy D. 201 ISABELLA STREET SUITE 500 PITTSBURGH PA 15212-5858 0 1 0 0 EVP & Chief Commercial Officer Common Stock, par value $0.01 per share 2021-09-13 4 M 0 7390 37.68 A 78221 D Common Stock, par value $0.01 per share 2021-09-13 4 S 0 17390 50.0249 D 60831 D Common Stock, par value $0.01 per share 604 I By Company 401(k) Plan Employee Stock Option (right to buy) 37.68 2021-09-13 4 M 0 7390 0.00 D 2018-02-02 2027-02-02 Common Stock 7390 0 D The price reported in column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $49.7300 - $50.2400. The reporting person undertakes to provide to Alcoa Corporation, any security holder of Alcoa Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote. Fluctuations in 401(k) share amounts reflect the plan's unit reporting method; units represent interests in the Company's stock fund. This option vested in equal installments over three years beginning on the date shown. Marissa P. Earnest, attorney-in-fact for Timothy D. Reyes 2021-09-15