0001520262 2026-02-24 2026-02-24 0001520262 true Alkermes plc. 8-K/A 2026-02-24 L2 001-35299 98-1007018 Connaught House 1 Burlington Road Dublin 4 IE D04 C5Y6 353 1-772-8000 false false false false Ordinary shares, $0.01 par value ALKS NASDAQ false Alkermes plc (the “Company”) filed a Current Report on Form 8-K on February 25, 2026 (the “Original Form 8-K”), reporting, among other items, that the Company’s board of directors (the “Board”) had appointed Blair C. Jackson, the Company’s then-current Executive Vice President, Chief Operating Officer, to serve as the Company’s Chief Executive Officer (“CEO”), effective August 1, 2026. This Amendment No. 1 on Form 8-K/A (this “Form 8-K/A”) amends and supplements Item 5.02 of the Original Form 8-K to provide information regarding additional actions taken by the Board in connection with Mr. Jackson’s appointment, including (i) information regarding the compensation awarded to Mr. Jackson, which was not yet determined at the time of filing of the Original Form 8-K and therefore excluded from the Original Form 8-K in reliance on the instructions to Item 5.02, and (ii) Mr. Jackson’s appointment as a director of the Company, effective August 1, 2026. This Form 8-K/A does not amend any other item of the Original Form 8-K.