DEFA14A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐		Preliminary Proxy Statement
☐		Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐		Definitive Proxy Statement
☒		Definitive Additional Materials
☐		Soliciting Material under § 240.14a-12

Sensei Biotherapeutics, Inc.

(Name of Registrant as Specified In Its Charter)

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

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

☒		No fee required
☐		Fee paid previously with preliminary materials
☐		Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

sensei BIO P.O. BOX 8016, CARY, NC 27512-9903 Your vote matters! Scan QR for digital voting Sensei Biotherapeutics, Inc. Annual Meeting of Stockholders Tuesday, June 11, 2024 9:00 AM, Eastern Time Annual Meeting to be held live webcast - please visit www.proxydocs.com/SNSE for more details. You must register to attend the meeting online and/or participate at www.proxydocs.com/SNSE For a convenient way to view proxy materials, VOTE, and obtain directions to attend the meeting go to www.proxydocs.com/SNSE To vote your proxy while visiting this site, you will need the 12 digit control number in the box below. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. This is not a ballot. You cannot use this notice to vote your shares. We encourage you to access and review all of the important information contained in the proxy materials before voting. Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the internet. If you want to receive a paper or e-mail copy of the proxy material, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year's meeting, you must make this request on or before May 31, 2024. Meeting Materials: Notice of Meeting and Proxy Statement & Annual Report on Form 10-K Important Notice Regarding the Availability of Proxy Materials for the Stockholders Meeting To Be Held On June 11, 2024 For Stockholders of record as of April 22, 2024 To order paper materials, use one of the following methods. R Internet: www.investorelections.com/SNSE Call: 1-866-648-8133 Email: [email protected] * If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions OR other inquiries should be included with your e-mail requesting material. Your control number Have the 12 digit control number located in the box above available when you access the website and follow the instructions. SEE REVERSE FOR FULL AGENDA Copyright © 2024 BetaNXT, Inc. or its affiliates. All Rights Reserved

sensei BIO THE BOARD OF DIRECTORS RECOMMENDS A VOTE: FOR ON PROPOSALS 1 AND 2 1. 2. Sensei Biotherapeutics, Inc. Annual Meeting of Stockholders PROPOSAL To elect the three Board's nominees to the Board of Directors to hold office until the 2027 Annual Meeting of Stockholders. 1.01 Jessie English 1.02 James Peyer 1.03 Thomas Ricks Ratification of selection by the Audit Committee of the Board of Directors of Deloitte & Touche LLP as the independent registered public accounting firm of the Company for the year ending December 31, 2024. 3. To conduct any other business properly brought before the meeting.

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