Alkermes plc. — Director's Dealing 2021

May 21, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2021-05-20

Reporting Person: MITCHELL PAUL J (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-20	Ordinary Shares	M	6104	—	Acquired	14104	Direct
2021-05-20	Ordinary Shares	F	2930	$21.92	Disposed	11174	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-20	Restricted Stock Unit Award	$0	M	6104	Disposed		Ordinary Shares (6104)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	7000	Indirect

Footnotes

F1: The reporting person and his wife are co-trustees of The Paul J. Mitchell Trust and the reporting person is also a beneficiary of The Paul J. Mitchell Trust originally established on November 19, 2014 and amended and restated on September 8, 2017 ("The Paul J. Mitchell Trust").

F2: This restricted stock unit award vested in full on 5/20/2021.