Abivax Announces Trading Resumption of its Ordinary Shares on Euronext Paris

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 the trading resumption of its ordinary shares on Euronext in Paris as from 4:20 p.m. CEST.

Trading of the ordinary shares of Abivax was halted at the request of the Company on October 20, 2023 from 9:00 a.m. CEST in connection with its previously announced 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.

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

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.