Adicet Bio, Inc. Announces Closing of $98 Million Public Follow-On Offering and Exercise in Full of the Underwriters’ Option to Purchase Additional Shares

Adicet Bio, Inc. (Nasdaq: ACET), a clinical stage biotechnology company discovering and developing allogeneic gamma delta T cell therapies for autoimmune diseases and cancer, today announced the closing of its previously announced underwritten public offering of 32,379,667 shares of its common stock, which includes 5,325,000 shares sold and issued upon the exercise in full by the underwriters of their option to purchase additional shares of common stock, and, in lieu of common stock to certain investors, pre-funded warrants to purchase 8,445,333 shares of common stock. The shares of common stock were sold at a public offering price of $2.40 per share and the pre-funded warrants were sold at a public offering price of $2.3999 per pre-funded warrant, which represents the per share public offering price of each share of common stock minus the $0.0001 per share exercise price for each pre-funded warrant. The aggregate gross proceeds from the offering, before deducting underwriting discounts and commissions and offering expenses, were approximately $98.0 million. All of the securities in the offering were sold by Adicet.

Jefferies and Guggenheim Securities acted as joint book-running managers for the offering. Truist Securities also acted as a joint bookrunner. Wedbush PacGrow and JMP Securities, A Citizens Company acted as co-managers.

The securities described above were offered by Adicet pursuant to a shelf registration statement that was previously filed with, and subsequently declared effective on May 9, 2022 by, the U.S. Securities and Exchange Commission (“SEC”). A final prospectus supplement and accompanying prospectus relating to and describing the terms of the offering was filed with the SEC on January 24, 2024. Copies of the final prospectus supplement and the accompanying prospectus relating to the offered securities may be obtained from Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, New York, NY 10022, by telephone at [phone], or by email at [e-mail] or Guggenheim Securities, LLC, Attention: Equity Syndicate Department, 330 Madison Avenue, 8th Floor, New York, NY 10017, by telephone at [phone], or by email at [e-mail].

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Adicet

Adicet Bio, Inc. is a clinical stage biotechnology company discovering and developing allogeneic gamma delta T cell therapies for autoimmune diseases and cancer. Adicet is advancing a pipeline of “off-the-shelf” gamma delta T cells, engineered with chimeric antigen receptors (CARs), to facilitate durable activity in patients.

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Adicet Bio, Inc. Investor and Media Contacts Anne Bowdidge [e-mail]