Sanofi completes the acquisition of Vigil Neuroscience, Inc.

Paris, August 6, 2025. Sanofi announces the completion of its acquisition of Vigil Neuroscience, Inc. (“Vigil”). This acquisition strengthens Sanofi’s early-stage pipeline in neurology with VG-3927, a novel, oral, small-molecule TREM2 agonist, which will be evaluated in a phase 2 clinical study in patients with Alzheimer’s disease. In addition, the acquisition of Vigil’s preclinical pipeline will further strengthen Sanofi’s research in various neurodegenerative diseases.

In June 2024, Sanofi made a $40 million strategic investment in Vigil that included the exclusive right of first negotiation for an exclusive license, grant, or transfer of rights to research, develop, manufacture, and commercialize VG-3927.

Under the terms of the acquisition agreement, Sanofi and Vigil have agreed to the following: 

• Sanofi acquired all outstanding common shares of Vigil for $8 per share in cash at closing, representing an equity value of approximately $470 million (on a fully diluted basis)
• In addition, Vigil’s shareholders received a non-transferrable contingent value right (CVR) per Vigil share, which entitles its holder to receive a deferred cash payment of $2, conditioned upon the first commercial sale of VG-3927.

VGL101, Vigil’s second clinical program, was not acquired by Sanofi. As previously communicated, the acquisition of Vigil is not expected to impact Sanofi's financial guidance for 2025.