Exhibit 99.1 Abivax Announces Full Year 2024 Financial Results PARIS, France – March 24, 2025 – 8:30 AM CET – Abivax SA (Euronext Paris: FR0012333284 – ABVX / Nasdaq: ABVX) ("Abivax" or the "Company"), a clinical-stage biotechnology company focused on developing innovative therapies for chronic inflammatory diseases, announced today its full-year financial results, as of December 31, 2024. The 2024 financial statements, approved by the Company's Board of Directors on March 20, 2025, have been audited by the ...