Business Brief – December 24, 2025

Sanofi to acquire Dynavax for $2.2 billion – Deal announced today brings marketed hepatitis B vaccine HEPLISAV-B and phase 1/2 shingles candidate into Sanofi's pipeline. Transaction expected to close in Q1 2026. Sanofi Press Release

BP sells 65% stake in Castrol lubricants division for $6 billion – Stonepeak acquisition announced today advances BP's debt reduction program. Sale follows broader portfolio restructuring strategy. The Guardian

Solventum completes acquisition of Acera Surgical – Deal closed today for $725 million upfront plus up to $125 million in contingent payments. Expands MedSurg portfolio into synthetic tissue matrices for regenerative wound care. BioSpace

All news verified as <24h old at time of publication.