PARIS - Abivax SA (Euronext Paris: FR0012333284 - ABVX) ('Abivax' or the 'Company'), a clinical-stage biotechnology company focused on developing therapeutics that harness the body's natural regulatory mechanisms to modulate the immune response in patients with chronic inflammatory diseases, announced today that trading of its ordinary shares on the regulated market of Euronext in Paris will be temporarily halted, at the Company's request, from the opening of the market at 9:00 a.m. CEST.

This trading halt takes place in the context of the initial public offering of the Company's American Depositary Shares ('ADSs') on the Nasdaq Global Market (the 'Global Offering'), in order to allow for the confirmation of allocations to investors and for the commencement of trading of the Company's ADSs on the Nasdaq Global Market.

This suspension will be effective until a new communication is released by the Company. Trading on Euronext Paris is expected to resume today, October 20, 2023, at approximately 4:30 p.m. (CEST), which is the earliest time ADSs are expected to begin trading on the Nasdaq Global Market under the ticker symbol 'ABVX.'

About Abivax

Abivax is a clinical-stage biotechnology company focused on developing therapeutics that harness the body's natural regulatory mechanisms to modulate the immune response in patients with chronic inflammatory diseases. Based in France and the U.S., Abivax's lead drug candidate, obefazimod (ABX464), is in Phase 3 clinical trials for the treatment of moderately to severely active ulcerative colitis.

Contact:

Regina Jehle

Email: regina.jehle@abivax.com

Tel: +33 6 24 60 69 63

Forward-Looking Statements

This press release contains certain forward-looking statements with respect to the proposed Global Offering, including: the timing and completion of the trading halt on Euronext Paris. Although the Company believes its expectations are based on reasonable assumptions, these forward-looking statements are subject to numerous risks and uncertainties, which could cause actual results to differ materially from those expressed in, or implied or projected by, the forward-looking statements.

Other than as required by applicable law, the Company does not undertake any obligation to update or revise any forward-looking information or statements. This press release and the information contained herein do not constitute an offer to sell or a solicitation of an offer to buy or subscribe to shares in the Company in any country. This press release has been prepared in both French and English. In the event of any differences between the two versions of the press release, the French language version shall supersede.

Disclaimers

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

The distribution of this document may, in certain jurisdictions, be restricted by local legislations. Persons into whose possession this document comes are required to inform themselves about and to observe any such potential local restrictions.

A French listing prospectus comprising (i) the 2023 Universal Registration Document (Document d'Enregistrement Universel 2023) filed with the French Autorite des marches financiers ('AMF') on May 4, 2023, under number D.23-0394, as amended by a first amendment filed with the AMF on September 29, 2023 under number D.23-0394-A01, as completed by a second amendment to such 2023 Universal Registration Document, which will be filed with the AMF, and (ii) a Securities Note (Note d'operation), including a summary of the prospectus, will be submitted to the approval by the AMF and will be published on the AMF's website at www.amf-france.org. Following the filing of the second amendment to the 2023 Universal Registration Document with the AMF, copies of Company's 2023 Universal Registration Document, as amended, will be available free of charge at the Company's head office located at 7-11 boulevard Haussmann, 75009 Paris, France.

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