Announcement relating to despatch of Definitive Proxy Statement and details of Scheme Meeting and Extraordinary General Meeting

Core Viewpoint - Alkermes plc has reached an agreement to acquire Avadel Pharmaceuticals plc, with the transaction structured as a scheme of arrangement under Irish law [1][7]. Group 1: Proposed Transaction Details - The acquisition involves Alkermes acquiring the entire issued and to be issued ordinary share capital of Avadel [1]. - A proxy statement has been mailed to Avadel shareholders, detailing the terms and conditions of the Proposed Transaction [2]. - The Scheme Meeting for Avadel shareholders is scheduled for January 12, 2026, at 10:00 a.m. Irish local time, followed by an extraordinary general meeting at 10:15 a.m. [3]. Group 2: Company Background - Avadel Pharmaceuticals plc is a biopharmaceutical company focused on innovative medication solutions, with its commercial product LUMRYZ™ approved for treating narcolepsy [4].