Company: SNSE
Filing Date: 2025-04-01
Form Type: PRE 14A
Source: 0000950170-25-048533
Chunk: 11

Company: Sensei Biotherapeutics, Inc.
Filing Date: 2025-04-01
Form: PRE 14A
Chunk 11
---
 |     | No effect            |     | No effect                                           |
| (1)             | This proposal is considered a “routine” matter under NYSE rules. Accordingly, if you hold your shares in street name and do not provide voting instructions to your broker, bank or other agent that holds your shares, your broker, bank or other agent has discretionary authority under NYSE rules to vote your shares on this proposal. We do not expect there to be broker-non votes on this matter. |     |                                                                                                                                                     |     |                                                                                                                                                          |     |                      |     |                                                     |

What is the quorum requirement?

A quorum of stockholders is necessary to hold a valid meeting. A quorum is present if stockholdersholdingat least a majority of the outstanding shares entitled to vote are present at the Annual Meeting virtually or represented by proxy. On the record date, there were 25,208,068 sharesoutstanding and entitled to vote.Thus, the holders of 12,604,035 shares must be present virtually or represented by proxy at the Annual Meeting to have a quorum.

<div align='center'>5</div>

Your shares will be counted towards the quorum only if you submit a valid proxy (or one is submitted on your behalf by your broker, bank or other nominee) or if you vote online at the meeting. Abstentions and broker non-votes will be counted towards the quorum requirement. If there is no quorum, either the chairman of the Annual Meeting or the holders of a majority of shares present at the Annual Meeting virtually or represented by proxy may adjourn the meeting to another date.

How can I find out the results of the voting at the Annual Meeting?

Preliminary voting results will be announced at the Annual Meeting. In addition, final voting results will be published in a current report on Form 8-K that we expect to file within four business days after the Annual Meeting.

<div align='center'>6

PROPOSAL NO. 1</div>

### ELECTION OF DIRECTORS
Our Board of Directors is divided into three classes and currently has six members. Each class consists, as nearly as possible, of one-third of the total number of directors, and each class has a three-year term. Vacancies on the Board may be filled only by persons elected by a majority of the remaining directors. A director elected by the Board to fill a vacancy in a class, including vacancies created by an increase in the number of directors, shall serve for the remainder of the full term