Blair C. Jackson - 05 Feb 2026 Form 4 Insider Report for Alkermes plc. (ALKS)

Role: EVP, Chief Operating Officer
Signature: /s/ Shantale Greenson, attorney-in-fact for Blair C. Jackson
Issuer symbol: ALKS
Transactions as of: 05 Feb 2026
Net transactions value: -$289,402
Form type: 4
Filing time: 06 Feb 2026, 19:12:38 UTC
Previous filing: 28 Feb 2025
Next filing: 20 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Jackson Blair Curtis	EVP, Chief Operating Officer	900 WINTER ST., WALTHAM	/s/ Shantale Greenson, attorney-in-fact for Blair C. Jackson	06 Feb 2026	0001842348

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ALKS	Ordinary Shares	Award		+28,810	+14%		230,178	05 Feb 2026	Direct	F1
transaction	ALKS	Ordinary Shares	Tax liability	$289,402	-8,626	-3.7%	$33.55	221,552	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.