---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-173134"
form_type: "8-K"
ticker: null
cik: "0001827087"
company_name: "Vigil Neuroscience, Inc."
filed_at: "2025-08-05T23:59:59+00:00"
generated_at: "2026-05-17T20:57:32.180488+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 1.0
calibrated_materiality_score: 1.0
confidence: "high"
source: SEC EDGAR
---

# Sanofi completes acquisition of Vigil Neuroscience for $8.00/sh + CVR

## Summary
- Merger closed Aug 5, 2025; each share of VIGL converted to $8.00 cash plus one CVR.
- CVR entitles holder to $2.00 per CVR upon first commercial sale of VG-3927 for Alzheimer's.
- Stockholders voted 35,191,885 for, 9,521 against, 133,827 abstain to adopt merger.
- All directors and officers resigned; replaced by designees of Sanofi.
- VIGL common stock trading halted; delisting and deregistration initiated.

## SEC filing metadata
- accession: 0001193125-25-173134
- form_type: 8-K
- cik: 0001827087
- company_name: Vigil Neuroscience, Inc.
- filed_at: 2025-08-05T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 1.0
- calibrated_materiality_score: 1.0
- confidence: high
- sec_items: 2.01, 3.01, 3.03, 5.01, 5.02, 5.03, 5.07, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1827087/000119312525173134/0001193125-25-173134-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1827087/000119312525173134/d904355d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-173134
- JSON: https://secwatch.observer/filing/0001193125-25-173134.json
- Plain text: https://secwatch.observer/filing/0001193125-25-173134.txt

## Key facts
- Governance Changes
  Vigil Neuroscience, Inc.: Certificate of incorporation amended and restated in its entirety pursuant to the Merger Agreement.
  - Change: charter amendment
  source text: Pursuant to the Merger Agreement, at the Effective Time, Vigil’s certificate of incorporation was amended and restated in its entirety.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1827087/000119312525173134/0001193125-25-173134-index.htm

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