---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-095174"
form_type: "8-K"
ticker: null
cik: "0001845337"
company_name: "Day One Biopharmaceuticals, Inc."
filed_at: "2026-03-06T23:59:59+00:00"
generated_at: "2026-05-15T18:56:52.736371+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Servier to acquire Day One Biopharmaceuticals for $21.50/share in all-cash deal valued at ~$2.5B

## Summary
- Acquisition at $21.50/share cash, total equity value ~$2.5B; premium of ~68% over March 5 close.
- Day One board recommends tender; transaction expected to close in Q2 2026.
- Conditions: majority of shares tendered, HSR clearance; no financing condition.
- Termination fee of $87.7M payable by Day One if it accepts a superior proposal.
- Servier to fund the acquisition from existing cash and investments.

## SEC filing metadata
- accession: 0001193125-26-095174
- form_type: 8-K
- cik: 0001845337
- company_name: Day One Biopharmaceuticals, Inc.
- filed_at: 2026-03-06T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1845337/000119312526095174/0001193125-26-095174-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1845337/000119312526095174/d108979d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-095174
- JSON: https://secwatch.observer/filing/0001193125-26-095174.json
- Plain text: https://secwatch.observer/filing/0001193125-26-095174.txt

## Key facts
- Material Agreements
  Day One Biopharmaceuticals, Inc. entered into Agreement and Plan of Merger with Servier Pharmaceuticals LLC, Servier Detroit Inc., and Servier S.A.S. (effective 2026-03-06).
  - Action: entry
  - Agreement: merger
  - Counterparty: Servier Pharmaceuticals LLC, Servier Detroit Inc., and Servier S.A.S.
  - Effective: 2026-03-06
  source text: On March 6, 2026, Servier Pharmaceuticals LLC, a Delaware limited liability company (“ Parent ”), Servier Detroit Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“ Merger Sub ”), Day One Biopharmaceuticals, Inc., a Delaware corporation (the “ Company ”), and Servier S.A.S., a French société par actions simplifiée , solely as a guarantor (“ Guarantor ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1845337/000119312526095174/0001193125-26-095174-index.htm

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