The acquisition builds on Sanofi’s $40 million strategic investment in Vigil made in June 2024. That investment granted Sanofi exclusive rights of first negotiation to license, acquire, or otherwise secure rights to develop, manufacture, and commercialize VG-3927.1
This marks Sanofi’s second acquisition of the year. In March, the company announced a deal with Dren Bio to acquire DR-020, a CD20-directed bispecific antibody in early clinical trials for refractory B-cell-mediated autoimmune diseases. Sanofi paid $600 million upfront in that transaction, with Dren eligible for up to $1.3 billion in milestone payments.2
Vigil’s CEO Highlights Synergies with Sanofi’s Platform
“We are incredibly proud of the extraordinary and diverse team at Vigil and the progress we have made in developing innovative TREM2-based therapeutics,” said Ivana Magovčević-Liebisch, PhD, JD, president, CEO, Vigil Neuroscience, in the press release. “We look forward to joining forces with Sanofi's team to leverage Sanofi’s resources, broad platform and far-reaching network to fully unlock and accelerate the development of VG-3927 for the potential treatment of Alzheimer’s disease—a devastating disease with significant unmet need.”
AD Remains a Pressing Unmet Need
According to Medical News Today, AD accounts for 60% to 80% of all dementia cases in the United States. Although most common in people over 65 years of age, the disease can also affect individuals in their 40s and 50s, and in rare cases, those in their 30s.3
Deal Structure and Closing Timeline
The transaction is expected to close in Q3 2025, pending shareholder and regulatory approvals. Notably, it excludes Vigil’s second program, VGL101, and is not expected to impact Sanofi’s financial guidance for 2025.1
“Sanofi’s complementary capabilities and commitment to bring innovative therapies to patients align with our mission and what we have passionately been working toward over the past five years,” continued Magovčević-Liebisch, in the press release. “We want to thank Vigil’s exceptional employees for their unrelenting dedication and our patient communities for their steadfast engagement, to whom I extend my deepest gratitude. Together, we look forward to following Sanofi’s journey in advancing next-generation small molecule TREM2 therapies for severe neurodegenerative diseases and potentially offering new treatment options to patients.”4
References
1. Press Release: Sanofi to acquire Vigil Neuroscience, Inc., adding a new investigational medicine to treat Alzheimer’s disease to the neurology pipeline. Sanofi. May 21, 2025. Accessed May 22, 2025. https://www.sanofi.com/en/media-room/press-releases/2025/2025-05-21-23-15-31-3086232
2. Sanofi Bolsters Immunology Pipeline with Acquisition of Dren Bio’s DR-0201 for Up to $1.9 Billion. PharmExec. March 20, 2025. Accessed May 22, 2025. https://www.pharmexec.com/view/sanofi-bolsters-immunology-pipeline-acquisition-dren-bio-dr-0201-1-9-billion
3. What to know about Alzheimer’s disease. MedicalNewsToday. Accessed May 22, 2025. https://www.medicalnewstoday.com/articles/159442
4. Vigil Neuroscience Enters into Definitive Merger Agreement to be Acquired by Sanofi. GlobeNewswire. May 21, 2025. Accessed May 22, 2025. https://www.globenewswire.com/news-release/2025/05/21/3086234/0/en/Vigil-Neuroscience-Enters-into-Definitive-Merger-Agreement-to-be-Acquired-by-Sanofi.html