SEC Form 8-K filed by Vigil Neuroscience Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 16, 2025

VIGIL NEUROSCIENCE, INC.

(Exact name of registrant as specified in its charter)

(857) 254-4445

(Registrant’s telephone number, including area code)

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

As previously disclosed, on May 21, 2025, Vigil Neuroscience, Inc., a Delaware corporation (the “Company” or “Vigil”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Sanofi, a French société anonyme (“Parent” or “Sanofi”), and Vesper Acquisition Sub Inc., a Delaware corporation and a wholly-owned subsidiary of Parent (“Merger Sub”), pursuant to which Merger Sub will merge with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly-owned subsidiary of Parent.

The completion of the Merger is conditioned upon, among other things, the expiration or termination of the required waiting period applicable to the consummation of the Merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Waiting Period”). The HSR Waiting Period expired at 11:59 p.m., Eastern Time, on July 16, 2025.

The completion of the Merger remains subject to the satisfaction or waiver of other customary closing conditions specified in the Merger Agreement, including the adoption of the Merger Agreement by the Company’s stockholders. As previously disclosed, the special stockholder meeting to consider adoption of the Merger Agreement has been scheduled to be held virtually on August 4, 2025, at 8:30 a.m., Eastern Time.

Forward Looking Statements

This communication includes certain disclosures that contain express or implied forward-looking statements related to Sanofi, Vigil and the acquisition of Vigil by Sanofi that are made pursuant to the safe harbor provisions of the federal securities laws, including, without limitation, express or implied forward-looking statements regarding: Vigil’s strategy, business plans and focus; the potential therapeutic benefit of the Company’s product candidates, including iluzanebart and VG-3927; the return of VGL101 to Amgen, Inc. (the “VGL101 Return”); the progress and timing of the clinical development of Vigil’s product candidates and programs; beliefs about observations made analyzing preclinical study and clinical trial data to date; and the future operations and performance of Sanofi and Vigil. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including all statements regarding the intent, belief or current expectation of the companies and members of their senior management teams. Words such as “will,” “could,” “would,” “should,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “predict,” “project,” “potential,” “continue,” “target,” variations of such words, and similar expressions are intended to identify such forward-looking statements, although not all forward-looking statements contain these identifying words. Examples of such forward-looking statements include, but are not limited to, express or implied:

These statements are based on current beliefs, judgments and assumptions based upon information currently available to Sanofi and Vigil management and utilized to develop plans, estimates and projections. By their very nature, forward-looking statements involve inherent risks and uncertainties, both general and specific. Sanofi and Vigil each caution that a number of important factors, including those described in this document, could cause actual results to differ materially from those contemplated in any forward-looking statements.

Factors that may affect future results and may cause these forward-looking statements to be inaccurate include, but are not limited to: the occurrence of any event, change or other circumstance that could give rise to the termination of the transaction; the possibility that competing offers will be made; the possibility that various closing conditions

for the transaction may not be satisfied or waived, including that a governmental entity may prohibit, delay or refuse to grant approval for the consummation of the transaction (or only grant approval subject to adverse conditions or limitations) or the receipt of the requisite approval of Vigil’s stockholders; the possibility that the proposed transaction may not be completed in the time frame expected by Sanofi and Vigil, or at all; the possibility that the VGL101 Return may not be completed in the anticipated time frame or at all; failure to realize the anticipated benefits of the proposed transaction in the time frame expected, or at all; the effects of the transaction on relationships with employees, other business partners or governmental entities; potential adverse reactions or changes to business relationships resulting from the announcement or completion of the proposed transaction; significant or unexpected costs, charges or expenses resulting from the proposed transaction; negative effects of this announcement or the consummation of the proposed transaction on the market price of Sanofi’s shares or Vigil’s common stock and/or Sanofi’s or Vigil’s operating results; potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the difficulty of predicting the timing or outcome of regulatory approvals or actions; the risks related to non-achievement of the contingent value right (“CVR”) milestone and that holders of the CVRs will not receive payments in respect of the CVRs; other business effects, including the effects of industry, economic or political conditions outside of Vigil’s or Sanofi’s control; potentially significant political, trade or regulatory developments and other circumstances beyond Vigil’s control, including government shutdowns, layoffs, voluntary resignations and reorganizations, new legislation and executive orders, trade disputes and tariffs; transaction costs; actual or contingent liabilities; risk of litigation and/or regulatory actions related to the proposed transaction; the outcome of any legal proceedings that may be instituted against the parties and others related to the proposed transaction; adverse impacts on business, operating results or financial condition in the future due to pandemics, epidemics or outbreaks and their impact on Sanofi’s and Vigil’s respective businesses, operations, supply chain, patient enrollment and retention, clinical trials, strategy, goals and anticipated milestone; government-mandated or market-driven price decreases for Sanofi’s or Vigil’s products; introduction of competing products; reliance on information technology; Sanofi’s or Vigil’s ability to successfully market current and new products; Sanofi’s, Vigil’s and their collaborators’ ability to continue to conduct research and clinical programs; Vigil’s ability to successfully demonstrate the efficacy and safety of its product candidates, the therapeutic potential of its product candidates and the preclinical or clinical results for its product candidates, which may not support further development of such product candidates; comments, feedback and actions of regulatory agencies; exposure to product liability and legal proceedings and investigations; and other risks and uncertainties detailed from time to time in Vigil’s periodic reports filed with the U.S. Securities and Exchange Commission (the “SEC”) and Vigil’s other filings with the SEC.

Any forward-looking statements speak only as of the date of this communication and are made based on the current beliefs, judgments and assumptions based upon information currently available to Sanofi’s and Vigil’s management. Forward-looking statements contained in this announcement are made as of this date, and Sanofi and Vigil undertake no duty to update such information except as required under applicable law. Readers should not rely upon the information on this page as current or accurate after its publication date.

Additional Information And Where To Find It

In connection with the proposed transaction between Vigil and Sanofi, Vigil has filed with the SEC a proxy statement on Schedule 14A (the “Proxy Statement”) relating to a special meeting of its stockholders. Additionally, Vigil may file other relevant materials with the SEC in connection with the proposed transaction. VIGIL’S STOCKHOLDERS AND OTHER INVESTORS ARE URGED TO READ THE PROXY STATEMENT AND ANY OTHER RELEVANT MATERIALS FILED OR THAT WILL BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE MATERIALS AND DOCUMENTS INCORPORATED BY REFERENCE THEREIN, CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION AND RELATED MATTERS. The Proxy Statement has been mailed or otherwise made available to Vigil’s securityholders. Investors and securityholders are able to obtain a copy of the Proxy Statement as well as other filings containing information about the proposed transaction that are filed by Vigil or Sanofi with the SEC, free of charge on EDGAR at www.sec.gov.

Participants in the Solicitation

Vigil and certain of its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Vigil in respect of the proposed transaction and any other matters to be voted on at the special meeting. Information about Vigil’s directors and executive officers, including a description of their interests, by security holdings or otherwise, in the proposed transaction is included in the Proxy Statement. Vigil stockholders may obtain additional information regarding the participants in the solicitation of proxies in connection with the proposed transaction by reading the Proxy Statement and any other relevant documents that are filed or will be filed with the SEC relating to the proposed transaction. You may obtain free copies of these document using the sources indicated above.

Internet Posting of Information

Vigil routinely posts information that may be important to investors in the “Investors” section of its website at https://www.vigilneuro.com. The Company encourages investors and potential investors to consult our website regularly for important information about Vigil.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.