---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-173860"
form_type: "8-K"
ticker: "SNSE"
cik: "0001829802"
company_name: "Sensei Biotherapeutics, Inc."
filed_at: "2023-06-23T23:59:59+00:00"
generated_at: "2026-06-13T18:22:40.901329+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.1
calibrated_materiality_score: 0.1
confidence: "high"
source: SEC EDGAR
---

# Sensei Biotherapeutics amends Rights Agreement to remove obsolete references to former stockholders

## Summary
- Amendment to Rights Agreement dated June 23, 2023 removes language about Apeiron Parties who no longer hold shares.
- No material change to rights of security holders; cleanup of obsolete provisions.
- Apeiron Parties sold all shares per Purchase Agreement dated May 23, 2023.

## SEC filing metadata
- accession: 0001193125-23-173860
- form_type: 8-K
- ticker: SNSE
- cik: 0001829802
- company_name: Sensei Biotherapeutics, Inc.
- filed_at: 2023-06-23T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.1
- calibrated_materiality_score: 0.1
- confidence: high
- sec_items: 1.01, 3.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1829802/000119312523173860/0001193125-23-173860-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1829802/000119312523173860/d526007d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-173860
- JSON: https://secwatch.observer/filing/0001193125-23-173860.json
- Plain text: https://secwatch.observer/filing/0001193125-23-173860.txt

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