SEC Form DEFA14A filed by SES AI Corporation

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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 Under Rule 14a-12

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No fee required.

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Fee computed 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

Your Vote Counts! *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V34826-P08287 Vote Virtually at the Meeting* June 7, 2024 10:00 AM EDT Virtually at: www.virtualshareholdermeeting.com/SES2024 SES AI CORPORATION 2024 Annual Meeting Vote by June 6, 2024 11:59 PM ET SES AI CORPORATION 35 CABOT ROAD WOBURN, MA 01801 You invested in SES AI CORPORATION and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on June 7, 2024. Get informed before you vote View the Notice & Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 24, 2024. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to [email protected]. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. Voting Items Board Recommends V34827-P08287 THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. To elect the two Class II director nominees to hold office until the 2027 Annual Meeting of Stockholders. For Nominees: 01) Dr. Jang Wook Choi 02) Anirvan Coomer 2. To ratify the appointment of Grant Thornton LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024. For 3. To approve, in a non-binding advisory vote, the compensation of our named executive officers. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof.