X0306 4/A 2020-04-03 2020-04-07 0000004281 Howmet Aerospace Inc. HWM 0001490905 Alving Amy E 201 ISABELLA STREET SUITE 200 PITTSBURGH, PA 15212 1 0 0 0 Common Stock 2020-04-03 4 A 0 3229 12.54 A 27256 D On April 1, 2020, Arconic Inc. completed the separation of its business into two independent, publicly-traded companies (the Separation): Howmet Aerospace Inc. and Arconic Corporation. This Form 4 is being amended to reflect the total number of Howmet Aerospace Inc. shares underlying equity awards held by the reporting person after reflecting the adjustment of all Arconic Inc. equity awards held by the reporting person as of the Separation to relate to Howmet Aerospace Inc. common stock in a manner intended to preserve the aggregate intrinsic value of the original awards, in accordance with the Employee Matters Agreement, as amended, between Howmet Aerospace Inc. and Arconic Corporation. /s/ Margaret Lam (Assistant Secretary), by power of attorney 2020-04-24