Form 4 Filing for Alkermes plc.

On August 17, 2026, Christian Todd Nichols, SVP, Chief Commercial Officer of Alkermes plc., reported the sale of 6,912 ordinary shares for an average price of $49.1851 per share and 664 ordinary shares for an average price of $49.6526 per share. These transactions were executed under a Rule 10b5-1 trading plan. Following these sales, Mr. Nichols directly owns 102,193 ordinary shares. The sales were part of a broader transaction involving multiple sales at varying prices, with detailed information available upon request. The filing was made on Form 4.