X0306 4 2020-12-17 0000004281 Howmet Aerospace Inc. HWM 0001136562 PLANT JOHN C 201 ISABELLA STREET SUITE 200 PITTSBURGH PA 15212-5872 1 1 0 0 Chairman and Co-CEO Common Stock 2020-12-17 4 M 0 60833 A 833173 D Common Stock 2020-12-17 4 F 0 25893 26.96 D 807280 D Common Stock 500463 I By Trust Restricted Stock Units 2020-12-17 4 M 0 60833 0 D Common Stock 60833 3645833 D 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. Shares held in grantor retained annuity trusts (GRATS), each of which the reporting person is the trustee and beneficiary. These restricted stock units vested on December 17, 2020, upon satisfaction of the conditions that an Average Price (as defined in the Letter Agreement by and between Howmet Aerospace and Mr. Plant, dated as of August 1, 2019 and, to take into account the separation of the Howmet Aerospace, as set forth in the Employee Matters Agreement, dated as of March 31, 2020, by and between Howmet Aerospace and Arconic Corporation) of $34 per share is achieved, and the continued employment of Mr. Plant as Chief Executive Officer of Howmet through such date. /s/ Margaret Lam, (Assistant Secretary) / Attorney- in-fact 2020-12-18