Company: SNSE
Filing Date: 2025-04-11
Form Type: DEF 14A
Source: 0000950170-25-053033
Chunk: 2

Company: Sensei Biotherapeutics, Inc.
Filing Date: 2025-04-11
Form: DEF 14A
Chunk 2
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 at www.proxypush.com/SNSE and during the Annual Meeting at www.proxydocs.com/SNSE, (2) by telephone by calling the toll-free number (866) 284-5317, or (3) if you elected to receive printed proxy materials by mail, by marking, dating, and signing your proxy card and returning it in the accompanying postage-paid envelope. Even if you have voted by proxy, you may still vote online if you attend the virtual Annual Meeting. Please note, however, that if your shares are held of record by a broker, bank, or other nominee and you wish to vote online at the Annual Meeting, you must obtain a proxy issued in your name from that record holder. |

Table of Contents

|                                                                                                                                                                 | Page |
| PROXY STATEMENT:                                                                                                                                                |      |
| QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS AND VOTING                                                                                                    |    1 |
| PROPOSAL 1-ELECTION OF DIRECTORS                                                                                                                                |    7 |
| PROPOSAL 2-RATIFICATION OF SELECTION OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMPROPOSAL 3-APPROVAL OF REVERSE STOCK SPLIT AND AUTHORIZED SHARES REDUCTION | 1516 |
| EXECUTIVE OFFICERS                                                                                                                                              |   24 |
| SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT                                                                                                  |   25 |
| SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE                                                                                                         |   27 |
| EXECUTIVE COMPENSATION                                                                                                                                          |   28 |
| DIRECTOR COMPENSATION                                                                                                                                           |   34 |
| SECURITIES AUTHORIZED FOR ISSUANCE UNDER EQUITY COMPENSATION PLANS                                                                                              |   36 |
| TRANSACTIONS WITH RELATED PERSONS                                                                                                                               |   37 |
| HOUSEHOLDING OF PROXY MATERIALS                                                                                                                                 |   39 |
| OTHER MATTERS                                                                                                                                                   |   40 |
| Appendix A – Form of Amendment to Certificate of Incorporation with Respect to Proposal 3                                                                       |  A-1 |

<div align='center'>SENSEI BIOTHERAPEUTICS, INC.

1405 Research Boulevard, Suite 125

Rockville, Maryland 28510

PROXY STATEMENT

For The 2025 Annual Meeting of Stockholders

To Be Held on May 21, 2025

QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS AND