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Sanofi to acquire hepatitis B vaccine maker Dynavax for $2.2 billion

Sanofi will acquire Dynavax for $2.2 billion to add the adult hepatitis B vaccine HEPLISAV-B and shingles vaccine candidate Z-1018 to its portfolio, targeting a large unvaccinated adult population.

  • Sanofi agreed to acquire Dynavax Technologies for about $2.2 billion, offering $15.50 per share in cash, with the deal subject to regulatory approval.
  • Sanofi is pursuing the deal to strengthen adult immunization by adding Dynavax's marketed vaccine and the shingles candidate Z-1018, marking its second vaccines buy this year after the Vicebio acquisition.
  • HEPLISAV-B's two-dose, one-month regimen sets it apart, with Dynavax reporting $268.4 million in 2024 sales and 46% market share .
  • The Dynavax board of directors unanimously approved the transaction, the tender offer has not yet commenced, and shareholders are urged to review tender offer materials and related SEC filings.
  • Sanofi said the agreement would not affect its 2025 outlook, and completion is subject to customary closing conditions including an HSR waiting period and foreign filings; it will fund the acquisition with available cash resources.
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Sanofi to acquire hepatitis B vaccine maker Dynavax for $2.2 billion

Sanofi will buy U.S. vaccines company Dynavax Technologies for around $2.2 billion (1.9 billion euros), the French drugmaker said on Wednesday, a deal that will give it access to an approved hepatitis B vaccine.

·United Kingdom
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PR Newswire broke the news in United States on Wednesday, December 24, 2025.
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