Howmet Aerospace Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION​

Washington, D.C. 20549​

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SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material Pursuant to§240.14a-12

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HOWMET AEROSPACE INC.​

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(Name of Registrant as Specified in its Charter)​

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)​

Payment of Filing Fee (Check all boxes that apply):

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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Letter to Our Shareholders

DEAR HOWMET AEROSPACE SHAREHOLDERS:

We are pleased to invite you to attend the 2026 Annual Meeting of Shareholders (the “Annual Meeting”) of Howmet Aerospace Inc., which will be held virtually via live webcast on Tuesday, May 19, 2026, at 9:00 a.m. Eastern Time. You will be able to attend the Annual Meeting online by visitingwww.virtualshareholdermeeting.com/HWM2026.

We believe hosting a virtual Annual Meeting enables greater shareholder attendance and participation from any location around the world, improves meeting efficiency and our ability to communicate effectively with our shareholders, and reduces the cost and environmental impact of the Annual Meeting.

We are pleased to present you with our 2026 Proxy Statement (the “Proxy Statement”), which represents our continuing commitment to transparency, good governance and performance-based executive compensation, and reflects the input we have received during dialogue with our investors. We encourage you to read the Proxy Statement carefully and vote your shares in accordance with the instructions included herein.

We also encourage you to review our 2025 Annual Report for more information on the Company’s performance. We are proud of our progress and achievements in 2025 and are encouraged by the opportunities 2026 presents.

Your vote is very important to us. Whether or not you will attend and participate in the Annual Meeting, we hope that your shares are represented and voted. In advance of the Annual Meeting on May 19, 2026, please cast your vote by internet, telephone, or mail. Instructions on how to vote are found in the section entitled“Questions and Answers About the Annual Meeting and Voting” in the Proxy Statement.

Thank you for being a shareholder of Howmet Aerospace. On behalf of the Board of Directors and employees of the Company, we appreciate your continued support.

Notice of 2026 Annual Meeting

of Shareholders

MEETING INFORMATION

Logistics

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ITEMS OF BUSINESS

Shareholders will be able to virtually attend the Annual Meeting, vote their shares electronically and submit questions during the live webcast of the meeting by visitingwww.virtualshareholdermeeting.com/HWM2026 and entering their 16-digit control number. Voting now atwww.proxyvote.com will ensure your representation at the Annual Meeting regardless of whether you participate in our live webcast. If you have already voted, there is no need to vote again unless you wish to change your vote.

VOTING

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A complete list of shareholders entitled to vote at the meeting will be available for examination during the meeting atwww.virtualshareholdermeeting.com/HWM2026.