Alkermes plc. — Director's Dealing 2015

May 22, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2015-05-20

Reporting Person: POPS RICHARD F (Director, Director and CEO, Alkermes plc)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-20	Ordinary Shares	M	8125	—	Acquired	535173	Direct
2015-05-20	Ordinary Shares	F	3827	$62.10	Disposed	531346	Direct
2015-05-21	Ordinary Shares	M	8125	—	Acquired	539471	Direct
2015-05-21	Ordinary Shares	F	3827	$61.80	Disposed	535644	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-20	Restricted Stock Unit Award	$0	M	8125	Disposed		Ordinary Shares (8125)	Direct
2015-05-21	Restricted Stock Unit Award	$0	M	8125	Disposed		Ordinary Shares (8125)	Direct

Footnotes

F1: Includes 108 shares that were omitted from the reporting person's previously filed Forms 3, 4 and 5.

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

F3: Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/21/13.