X0306 4 2019-03-05 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 2019-03-05 4 P 0 35000 18.6509 A 45000 I By Trust Common Stock 2019-03-06 4 P 0 35000 18.7037 A 80000 I By Trust Common Stock 2019-03-07 4 P 0 35000 18.1612 A 115000 I By Trust The amount of securities beneficially owned reflects the forfeiture of 4,450 restricted stock units in connection with the reporting person's cessation of service as Non-Executive Chairman of Arconic Inc. and appointment as Chairman and Chief Executive Officer of Arconic Inc. The acquisition of these restricted stock units was previously reported in Table I of the reporting person's Form 4 on October 24, 2018. The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The price reported in column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $18.47 to $18.75. The reporting person undertakes to provide to Arconic Inc., any security holder of Arconic Inc., 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 $18.53 to $18.94. The reporting person undertakes to provide to Arconic Inc., any security holder of Arconic Inc., 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. The price reported in column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $18.03 to $18.61. The reporting person undertakes to provide to Arconic Inc., any security holder of Arconic Inc., 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 2019-03-07