Dynavax Technologies (DVAX) surged 37.56% in pre-market trading after French pharmaceutical giant Sanofi announced it would acquire the company for $2.2 billion.
Sanofi will pay $15.50 per share in cash, a 39% premium over Dynavax's closing price on Tuesday. The deal, expected to close in Q1 2026, includes Dynavax's marketed adult hepatitis B vaccine (HEPLISAV-B) and a Phase 1/2 shingles candidate, bolstering Sanofi's vaccine portfolio.
The acquisition is fully funded by Sanofi's cash reserves and will not impact its 2025 financial outlook. Dynavax's board unanimously approved the deal, citing Sanofi's global scale as key to maximizing the value of its vaccine pipeline.