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Press Release: Sanofi completes the acquisition of Vigil Neuroscience, Inc.

1. Sanofi acquires Vigil Neuroscience, enhancing its neurology pipeline. 2. Vigil's VG-3927 is for Alzheimer’s, entering phase 2 trials. 3. Acquisition valued at approximately $470 million, with cash payment per share. 4. Sanofi's financial guidance for 2025 remains unaffected by the acquisition. 5. Vigil's second clinical program, VGL101, was not included in the deal.

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Why Bullish?

Sanofi’s strategic acquisition strengthens its R&D capabilities, similar to past successful acquisitions. The focus on Alzheimer’s positions SNY well in a growing market segment.

How important is it?

The acquisition directly affects SNY’s product pipeline and strategic positioning in neurology, essential for future growth.

Why Long Term?

The benefits from this acquisition may take time to materialize, following clinical trial results. Long-term improvements in pipeline value can increase SNY’s market position.

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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. About Sanofi Sanofi is an R&D driven, AI-powered biopharma company committed to improving people’s lives and delivering compelling growth. We apply our deep understanding of the immune system to invent medicines and vaccines that treat and protect millions of people around the world, with an innovative pipeline that could benefit millions more. Our team is guided by one purpose: we chase the miracles of science to improve people’s lives; this inspires us to drive progress and deliver positive impact for our people and the communities we serve, by addressing the most urgent healthcare, environmental, and societal challenges of our time.Sanofi is listed on EURONEXT: SAN and NASDAQ: SNY Media RelationsSandrine Guendoul | +33 6 25 09 14 25 | sandrine.guendoul@sanofi.comEvan Berland | +1 215 432 0234 | evan.berland@sanofi.comLéo Le Bourhis | +33 6 75 06 43 81 | leo.lebourhis@sanofi.comVictor Rouault | +33 6 70 93 71 40 | victor.rouault@sanofi.comTimothy Gilbert | +1 516 521 2929 | timothy.gilbert@sanofi.comLéa Ubaldi | +33 6 30 19 66 46 | lea.ubaldi@sanofi.com Investor RelationsThomas Kudsk Larsen | +44 7545 513 693 | thomas.larsen@sanofi.comAlizé Kaisserian | +33 6 47 04 12 11 | alize.kaisserian@sanofi.comFelix Lauscher | +1 908 612 7239 | felix.lauscher@sanofi.comKeita Browne | +1 781 249 1766 | keita.browne@sanofi.comNathalie Pham | +33 7 85 93 30 17 | nathalie.pham@sanofi.comTarik Elgoutni | +1 617 710 3587 | tarik.elgoutni@sanofi.comThibaud Châtelet | +33 6 80 80 89 90 | thibaud.chatelet@sanofi.comYun Li | +33 6 84 00 90 72 | yun.li3@sanofi.com Sanofi forward-looking statementsThis press release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995, as amended. Forward-looking statements are statements that are not historical facts. These statements include projections and estimates and their underlying assumptions, statements regarding plans, objectives, intentions, and expectations with respect to future financial results, events, operations, services, product development and potential, and statements regarding future performance. Forward-looking statements are generally identified by the words “expects”, “anticipates”, “believes”, “intends”, “estimates”, “plans” and similar expressions. Although Sanofi’s management believes that the expectations reflected in such forward-looking statements are reasonable, investors are cautioned that forward-looking information and statements are subject to various risks and uncertainties, many of which are difficult to predict and generally beyond the control of Sanofi, that could cause actual results and developments to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. These risks and uncertainties include among other things, the uncertainties inherent in research and development, future clinical data and analysis, including post marketing, decisions by regulatory authorities, such as the FDA or the EMA, regarding whether and when to approve any drug, device or biological application that may be filed for any such product candidates as well as their decisions regarding labelling and other matters that could affect the availability or commercial potential of such product candidates, the fact that product candidates if approved may not be commercially successful, the future approval and commercial success of therapeutic alternatives, Sanofi’s ability to benefit from external growth opportunities, to complete related transactions and/or obtain regulatory clearances, risks associated with intellectual property and any related pending or future litigation and the ultimate outcome of such litigation, trends in exchange rates and prevailing interest rates, volatile economic and market conditions, cost containment initiatives and subsequent changes thereto, and the impact that global crises may have on us, our customers, suppliers, vendors, and other business partners, and the financial condition of any one of them, as well as on our employees and on the global economy as a whole. The risks and uncertainties also include the uncertainties discussed or identified in the public filings with the SEC and the AMF made by Sanofi, including those listed under “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements” in Sanofi’s annual report on Form 20-F for the year ended December 31, 2024. Other than as required by applicable law, Sanofi does not undertake any obligation to update or revise any forward-looking information or statements. All trademarks mentioned in this press release are the property of the Sanofi group. Press Release

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