Abivax Presents Business Updates and First Half 2026 Financial Results 

PARIS, France – September 21, 2026 – 10:05 PM CEST – Abivax SA (Euronext Paris: FR0012333284 – ABVX / Nasdaq – ABVX) (“Abivax” or the “Company”), a clinical-stage biotechnology company focused on developing therapeutics that harness the body’s natural regulatory mechanisms to stabilize the immune response in patients with chronic inflammatory diseases, reported today business updates and financial results for the six months ended June 30, 2026. The half-year financial statements, approved by the Company’s Board of Directors on September 18, 2026, have been reviewed by the Company’s statutory auditors, and the financial reports will be filed with the French and U.S. securities regulatory authorities on September 21, 2026. A brief presentation summarizing these business and financial updates is available on the Investor Relations section of Abivax’s website.