Adicet Bio Inc — Current Report (Form 8-K)

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

Adicet Bio, Inc.

(Exact name of Registrant as Specified in Its Charter)

(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:

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 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. ☐

Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On December 26, 2025, Adicet Bio, Inc. (the “Company”) filed an amendment (the “Certificate of Amendment”) to its Restated Certificate of Incorporation, to effectuate a reverse stock split of the Company’s issued and outstanding shares of common stock, par value $0.0001 per share (the “Common Stock”).

As previously disclosed, at its 2025 Special Meeting of Stockholders held on December 19, 2025 (the “Special Meeting”), and upon the recommendation of the Company’s Board of Directors (the “Board”), the Company’s stockholders approved a certificate of amendment to effect a reverse stock split of the Common Stock at a ratio ranging from any whole number between 1-for-5 and 1-for-30, as determined by the Board in its discretion, subject to the Board’s authority to abandon such amendment (the “Charter Amendment”).

The Charter Amendment was described in detail under “Proposal No. 1: Reverse Stock Split Proposal” beginning on page 5 of the Company’s definitive proxy statement filed with the Securities and Exchange Commission on November 17, 2025 (the “Proxy Statement”) in connection with the Special Meeting. The text of the Charter Amendment was included in Appendix A of the Proxy Statement.

On December 19, 2025, the Board approved a reverse stock split of the Common Stock at a ratio of 1-for-16. Effective as of 12:01 a.m. Eastern Time on December 30, 2025, the Company filed the Charter Amendment to effect a 1-for-16 reverse stock split of its shares of Common Stock (the “Reverse Stock Split”).

As a result of the Reverse Stock Split, every 16 shares of the Company’s Common Stock issued or outstanding were automatically reclassified into one validly issued, fully-paid and non-assessable new share of Common Stock, subject to the treatment of fractional shares as described below, without any action on the part of the holders. Proportional adjustments were made to the number of shares of Common Stock awarded and available for issuance under the Company’s equity incentive plans, as well as the exercise price and the number of shares issuable upon the exercise or conversion of the Company’s outstanding stock options and other equity securities under the Company’s equity incentive plans. All outstanding warrants were also adjusted in accordance with their terms, which resulted, among other changes to the warrant terms, in proportionate adjustments being made to the number of shares issuable upon exercise of such warrants and to the exercise and redemption prices of such warrants. The shares of Common Stock outstanding following the Reverse Stock Split remain fully paid and non-assessable. The Reverse Stock Split did not affect the number of authorized shares of Common Stock or the par value of the Common Stock.

No fractional shares will be issued in connection with the Reverse Stock Split. Stockholders who would otherwise be entitled to receive fractional shares will automatically be entitled to receive cash in lieu of such fractional share.

Trading of the Common Stock on The Nasdaq Capital Market will commence on a split-adjusted basis at market open on December 30, 2025 under the existing trading symbol “ACET.” The new CUSIP number for the Company’s Common Stock following the Reverse Stock Split is 007002207.

The foregoing description of the Charter Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the certificate of amendment, a copy of which is filed as Exhibit 3.1 to this Form 8-K and is incorporated herein by reference.

Item 8.01 Other Events.

On December 26, 2025, the Company issued a press release announcing the Reverse Stock Split and other related information. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K.

Cautionary Note Regarding Forward Looking Statements

The disclosure in this Current Report on Form 8-K contains "forward-looking statements" of Adicet within the meaning of the Private Securities Litigation Reform Act of 1995 relating to the business and operations of Adicet. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. These forward-looking statements include, but are not limited to, express or implied statements regarding the Company’s expectations about the effects of the Reverse Stock Split, including the trading of the Company’s common stock on The Nasdaq Capital Market following the Reverse Stock Split.

Any forward-looking statements in this Current Report on Form 8-K are based on management's current expectations and beliefs of future events, and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements, including without limitation, the effect of global economic conditions and public health crises on the Company’s business and financial results, including with respect to disruptions to its preclinical and clinical studies, business operations, employee hiring and retention, and ability to raise additional capital; Adicet's ability to execute on its strategy including obtaining the requisite regulatory approvals on the expected timeline, if at all; that positive results, including interim results, from a preclinical or clinical study may not necessarily be predictive of the results of future or ongoing studies; that clinical studies may fail to demonstrate adequate safety and efficacy of Adicet’s product candidates, which would prevent, delay, or limit the scope of regulatory approval and commercialization; and regulatory approval processes of the U.S. Food and Drug Administration and comparable foreign regulatory authorities are lengthy, time-consuming, and inherently unpredictable; and Adicet’s ability to meet production and product release expectations. For a discussion of these and other risks and uncertainties, and other important factors, any of which could cause Adicet's actual results to differ from those contained in the forward-looking statements, see the section titled "Risk Factors" in Adicet's most recent Quarterly Report on Form 10-Q and subsequent filings with the U.S. Securities and Exchange Commission (SEC), as well as discussions of potential risks, uncertainties, and other important factors in Adicet’s other filings with the SEC. All disclosure in this Current Report on Form 8-K is as of the date of this filing, and Adicet undertakes no duty to update this information unless required by law.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

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.