David Joseph Gaffin - 05 Feb 2026 Form 4 Insider Report for Alkermes plc. (ALKS)

Role: EVP, CLO, Alkermes, Inc.
Signature: /s/ Shantale Greenson, attorney-in-fact for David Joseph Gaffin
Issuer symbol: ALKS
Transactions as of: 05 Feb 2026
Net transactions value: -$255,617
Form type: 4
Filing time: 06 Feb 2026, 19:11:15 UTC
Previous filing: 04 Aug 2025
Next filing: 20 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gaffin David Joseph	EVP, CLO, Alkermes, Inc.	900 WINTER STREET, WALTHAM	/s/ Shantale Greenson, attorney-in-fact for David Joseph Gaffin	06 Feb 2026	0001675905

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ALKS	Ordinary Shares	Award		+25,352	+12%		230,726	05 Feb 2026	Direct	F1
transaction	ALKS	Ordinary Shares	Tax liability	$255,617	-7,619	-3.3%	$33.55	223,107	05 Feb 2026	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	These ordinary shares were acquired by the reporting person as a result of the vesting of performance-vesting restricted stock unit awards granted to the reporting person on February 23, 2023 with a three-year performance period that ended on December 31, 2025 (the "2023 PRSUs"). The vesting of this portion of the 2023 PRSUs was triggered by the determination of achievement of certain pre-specified performance goals and application of a relative total shareholder return modifier and represents the final vesting event under the 2023 PRSUs.

Content

These ordinary shares were acquired by the reporting person as a result of the vesting of performance-vesting restricted stock unit awards granted to the reporting person on February 23, 2023 with a three-year performance period that ended on December 31, 2025 (the "2023 PRSUs"). The vesting of this portion of the 2023 PRSUs was triggered by the determination of achievement of certain pre-specified performance goals and application of a relative total shareholder return modifier and represents the final vesting event under the 2023 PRSUs.