Alkermes plc. — Director's Dealing 2016

May 23, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2016-05-21

Reporting Person: Pugh Gordon G (SVP, COO & CRO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-05-21	Ordinary Shares	M	4125	—	Acquired	11074	Direct
2016-05-21	Ordinary Shares	F	1339	$42.98	Disposed	9735	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-05-21	Restricted Stock Unit Award	$0	M	4125	Disposed		Ordinary Shares (4125)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	47781	Indirect
Ordinary Shares	6989	Indirect
Ordinary Shares	13101	Indirect

Footnotes

F1: Shares held by KAS Grantor Retained Annuity Trust dated December 16, 2014 (the "GRAT"). The Reporting Person's spouse is a trustee and beneficiary of the GRAT.

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