---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-140329"
form_type: "8-K"
ticker: "SNSE"
cik: "0001829802"
company_name: "Sensei Biotherapeutics, Inc."
filed_at: "2025-06-13T23:59:59+00:00"
generated_at: "2026-05-19T08:59:29.564536+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Sensei Biotherapeutics announces 1-for-20 reverse stock split effective June 16

## Summary
- Reverse stock split at 1-for-20 ratio effective 5:00 p.m. ET on June 16, 2025.
- Authorized shares reduced from 250,000,000 to 12,500,000; par value unchanged.
- No fractional shares issued; stockholders receive cash payment in lieu.
- Common stock trades on split-adjusted basis on Nasdaq Capital Market starting June 17, 2025.
- Outstanding stock options, RSUs, and warrants proportionately adjusted.

## SEC filing metadata
- accession: 0001193125-25-140329
- form_type: 8-K
- ticker: SNSE
- cik: 0001829802
- company_name: Sensei Biotherapeutics, Inc.
- filed_at: 2025-06-13T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1829802/000119312525140329/0001193125-25-140329-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1829802/000119312525140329/d945713d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-140329
- JSON: https://secwatch.observer/filing/0001193125-25-140329.json
- Plain text: https://secwatch.observer/filing/0001193125-25-140329.txt

## Key facts
- Governance Changes
  Sensei Biotherapeutics, Inc.: Filed Certificate of Amendment for a one-for-twenty reverse stock split and reduction of authorized shares from 250,000,000 to 12,500,000 (effective 2025-06-16).
  - Change: charter amendment
  - Effective: 2025-06-16
  source text: On June 12, 2025, Sensei Biotherapeutics, Inc. (the “Company”) filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation (the “Amendment”) with the Secretary of State of the State of Delaware to effect a one-for-twenty (1-for-20) reverse stock split (the “Reverse Stock Split”) of its outstanding common stock and a reduction in the total number of authorized shares of its common stock from 250,000,000 to 12,500,000 (the “Shares Reduction”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1829802/000119312525140329/0001193125-25-140329-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.