Alkermes plc. - Director's Dealing 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2026-02-18

Reporting Person: Hopkinson Craig C. (EVP R&D, Chief Medical Officer)

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-18	Ordinary Shares	M	8897	—	Acquired	84535	Direct
2026-02-18	Ordinary Shares	F	3504	$32.02	Disposed	81031	Direct
2026-02-19	Ordinary Shares	M	7673	—	Acquired	88704	Direct
2026-02-19	Ordinary Shares	F	3407	$32.00	Disposed	85297	Direct

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-18	Restricted Stock Unit Award	$	M	8897	Disposed		Ordinary Shares (8897)	Direct
2026-02-19	Restricted Stock Unit Award	$	M	7673	Disposed		Ordinary Shares (7673)	Direct

F1: Each restricted stock unit represents a contingent right to receive one ordinary share.

F2: This award is fully vested in accordance with its terms.

F3: Shares subject to the restricted stock unit award vest in four equal annual installments, commencing on 2/19/2026.