X0306 4 2019-05-02 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 2019-05-02 4 P 0 50000 22.1386 A 50000 I By Trust These shares, which were previously reported as indirectly held in a revocable living trust, were contributed to a grantor retained annuity trust (GRAT) on March 20, 2019. The reporting person is the trustee and beneficiary of the GRAT. The price reported in column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $21.91 to $22.20. The reporting person undertakes to provide 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. /s/ Margaret Lam (Assistant Secretary), by power of attorney 2019-05-06