Pharma BD Deal Intelligence
Sanofi's Vaccine Lineup Gets a Shot in the Arm With $2.2B Dynavax Acquisition. William Blair analyst Matt Phipps noted the acquisition makes strategic sense,…
Big Pharma Dealmakers Joined by Spunky Group of Biotech Buyers in Q4. The roundup positions Sanofi's $2.2B Dynavax acquisition as one of the headline Q4…
Official Sanofi completion press release for the Dynavax acquisition, Feb 10, 2026.
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Sanofi acquired Dynavax Technologies in an all-cash tender offer of $15.50 per share (~$2.2B equity value; a 39% premium to the Dec 23, 2025 close), announced Dec 24, 2025 and completed Feb 10, 2026. The deal adds Dynavax’s marketed adult hepatitis B vaccine HEPLISAV-B — differentiated by a 2-dose, 1-month regimen — plus a Phase 1/2 shingles candidate (Z-1018) to Sanofi’s adult-immunization portfolio. Funded with available cash.
| Deal | Year | Value | Outcome |
|---|---|---|---|
| Sanofi SA / Dynavax Technologies (this deal) | 2025 | $2.2B | 67 |
| Sanofi SA / Regeneron Pharmaceuticals, Inc. | 2007 | $1.0B | 97 |
| Sanofi SA / Synthelabo S.A. | 1998 | $11.0B | 84 |
| Sanofi SA / Genzyme Corporation | 2011 | $20.1B | 84 |
| Sanofi SA / Amunix Pharmaceuticals Inc. | 2021 | $1.2B | 76 |
| Sanofi SA / Genzyme Corporation | 2010 | $18.5B | 75 |
| Sanofi SA / Translate Bio Inc. | 2018 | $805M | 73 |
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