X0306 4 2020-02-06 0000004281 Arconic Inc. ARNC 0001136562 PLANT JOHN C 390 PARK AVENUE NEW YORK, NY 10022 1 1 0 0 Chairman and CEO Common Stock 2020-02-06 4 M 0 1000000 A 1028282 D Common Stock 2020-02-06 4 F 0 414138 31.40 D 614144 D Common Stock 220000 I By Trust Common Stock 80463 I By Trust Restricted Stock Unit 2020-02-06 4 M 0 1000000 0 A Common Stock 1000000 0 D Acquisition of common stock upon vesting and settlement of restricted stock units. Each restricted stock unit converted into common stock on a one-for-one basis. Represents payment of tax liability by delivering or withholding shares incident to the vesting of a stock award issued in accordance with Rule 16b-3 Grantor retained annuity trust (GRAT) of which the reporting person is the trustee and beneficiary. Revocable living trust of which the reporting person is the trustee and beneficiary, with voting and investment power. Each restricted stock unit represents a contingent right to receive one share of common stock of Arconic Inc. ("Arconic") or, at Arconic's election, cash equivalent to the fair market value thereof. These restricted stock units vested on the first anniversary of February 6, 2019, and were contingent on Mr. Plant's continued service as Chief Executive Officer through such date and subject to partial or full accelerated vesting upon the occurrence of certain events. Vested restricted stock units will be settled in shares or cash, as applicable, within 30 days following the vesting date. /s/ Margaret Lam (Assistant Secretary), by power of attorney 2020-02-07