# EDGAR Filing Document

**Accession Number:** 0001829802
**File Stem:** 9999999995-26-001978
**Filing Date:** 2026-6
**Character Count:** 1300
**Document Hash:** d436abee1ddac33ba6dee0ad6c7ceff8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-26-001978.hdr.sgml**: 20260615

**ACCESSION NUMBER**: 9999999995-26-001978

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260612

**DATE AS OF CHANGE**: 20260615

**EFFECTIVENESS DATE**: 20260612

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Sensei Biotherapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001829802
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-295362
- **FILM NUMBER:** 261088913

**BUSINESS ADDRESS:**
- **STREET 1:** 1405 RESEARCH BLVD, SUITE 125
- **CITY:** ROCKVILLE
- **STATE:** MD
- **ZIP:** 20850
- **BUSINESS PHONE:** (240) 243-8000

**MAIL ADDRESS:**
- **STREET 1:** 1405 RESEARCH BLVD, SUITE 125
- **CITY:** ROCKVILLE
- **STATE:** MD
- **ZIP:** 20850

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** June 12, 2026

**Time:** 09:00:00

**Form Type:** S-3

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**CIK:** 0001829802

**Company Name:** Sensei Biotherapeutics, Inc.

**File Number:** 333-295362