X0306 4 2019-08-06 0000004281 Arconic Inc. ARNC 0001136562 PLANT JOHN C 390 PARK AVENUE NEW YORK, NY 10022 1 1 0 0 Chairman and CEO Common Stock 28282 D Common Stock 220000 I By Trust Common Stock 2019-08-06 4 P 0 17820 24.0971 A 67820 I By Trust Common Stock 2019-08-07 4 P 0 12643 24.1751 A 80463 I By Trust Grantor retained annuity trust (GRAT) of which the reporting person is the trustee and beneficiary. The price reported in column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $23.89 to $24.19. The reporting person undertakes to provide to Arconic Inc. ("Arconic"), any security holder of Arconic, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the range set forth in this footnote. Revocable living trust of which the reporting person is the trustee and beneficiary, with voting and investment power. The price reported in column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $24.12 to $24.20. The reporting person undertakes to provide to Arconic, any security holder of Arconic, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the range set forth in this footnote. /s/ Margaret Lam (Assistant Secretary), by power of attorney 2019-08-08