Alkermes plc. — Director's Dealing 2015

May 26, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2015-05-21

Reporting Person: Peterson Rebecca (SVP, Corporate Communications)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-21	Ordinary Shares	M	2500	—	Acquired	2500	Direct
2015-05-21	Ordinary Shares	F	1178	$61.80	Disposed	1322	Direct
2015-05-26	Ordinary Shares	S	1322	$60.49	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-21	Restricted Stock Unit Award	$0	M	2500	Disposed		Ordinary Shares (2500)	Direct

Footnotes

F1: This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2: Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/21/13.