Form 4 Filing for Alkermes plc.

Cato T. Laurencin, a director at Alkermes plc., reported several transactions on May 20-21, 2026. On May 20, Laurencin acquired 11,538 non-qualified stock options with an exercise price of $36.98 and 5,409 restricted stock units (RSUs). On May 21, 6,142 RSUs vested and were disposed of, with the value noted as $0.00 per share, as each RSU represents a contingent right to one ordinary share. Additionally, on May 21, there were two non-derivative transactions involving ordinary shares: the acquisition of 6,142 shares and the disposal of 1,475 shares at a price of $36.95 per share. Following these transactions, Laurencin holds 35,244 ordinary shares directly.