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flag Sanofi to buy Dynavax for $2.2B to boost adult vaccines, closing early 2026.

flag Sanofi has agreed to acquire vaccine developer Dynavax Technologies in a $2.2 billion all-cash deal, offering $15.50 per share, a 39% premium over Dynavax’s prior closing price. flag The acquisition, expected to close in early 2026, adds Dynavax’s marketed hepatitis B vaccine, HEPLISAV-B, and a shingles vaccine candidate in early clinical trials to Sanofi’s portfolio. flag The move aims to strengthen Sanofi’s adult immunization offerings amid recent regulatory setbacks and a push to diversify beyond its top-selling drug, Dupixent. flag The transaction is not expected to impact Sanofi’s 2025 financial guidance.

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