X0306 4 2020-08-06 0000004281 Howmet Aerospace Inc. HWM 0001136562 PLANT JOHN C 201 ISABELLA STREET SUITE 200 PITTSBURGH PA 15212 1 1 0 0 Chairman and Co-CEO Common Stock 2020-08-06 4 M 0 608332 17.28 A 1028600 D Common Stock 2020-08-06 4 F 0 256260 17.28 D 772340 D Common Stock 500463 I By Trust Restricted Stock Unit 2020-08-06 4 M 0 486666 0.0 D Common Stock 486666 3828332 D Restricted Stock Unit 2020-08-06 4 M 0 60833 0 D Common Stock 60833 3767499 D Restricted Stock Unit 2020-08-06 4 M 0 60833 0.0 D Common Stock 60833 3706666 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 August 6, 2020, upon satisfaction of the condition of the continued employment of Mr. Plant as Chief Executive Officer of Howmet Aerospace Inc. (Howmet) through such date. These restricted stock units vested on August 6, 2020, upon satisfaction of the conditions that the Spinoff Date (as defined in the Letter Agreement, by and between Howmet and Mr. Plant, dated as of August 1, 2019 (the Letter Agreement) has occurred prior to August 6, 2020, and the continued employment of Mr. Plant as Chief Executive Officer of Howmet through such date. These restricted stock units vested on August 6, 2020, upon satisfaction of the conditions that Howmet's common stock achieve an Average Price (as defined in the Letter Agreement and, to take into account the separation of the Company, as set forth in the Employee Matters Agreement, dated as of March 31, 2020, by and between Howmet and Arconic Corporation ) of $32 per share, and the continued employment of Mr. Plant as Chief Executive Officer of Howmet through such date. /s/ Margaret Lam (Assistant Secretary), by power of attorney 2020-08-10