Registration Document 2017

In application of its General Regulations, specifically Article 212-13, the Autorité des Marchés Financiers (the “AMF”) filed this Registration Document on 11 May 2017 under number R.17-043. This document may only be used in support of a financial transaction if it is accompanied by a prospectus duly approved by the AMF. It was prepared by the issuer under the responsibility of its signatories.

The registration, pursuant to the provisions of Article L. 621-8-1-I of the French Monetary and Financial Code, was performed after the AMF verified “whether the document is complete and comprehensible and the information it contains is consistent”. It does not imply that the accounting and financial information presented was authenticated by the AMF.

Copies of this registration document are available free of charge from the Company at 5 rue de la Baume, 75008 Paris, France, as well as electronically from the Company’s website (www.abivax.com) and on the website of the Autorité des Marchés Financiers (www.amf-france.org).