Alkermes plc. — Director's Dealing 2014

May 20, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2014-05-17

Reporting Person: FRATES JAMES M (SVP & CFO, Alkermes plc)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-05-17	Ordinary Shares	M	4350	—	Acquired	40994	Direct
2014-05-17	Ordinary Shares	F	2052	$43.59	Disposed	38942	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-05-17	Restricted Stock Unit Award	$0	M	4350	Disposed		Ordinary Shares (4350)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	4000	Indirect
Ordinary Shares	57000	Indirect

Footnotes

F1: Shares held by James M. Frates Grantor Retained Annuity Trust dated March 14, 2014 (the "GRAT"). The Reporting Person is a trustee and beneficiary of the GRAT and may be deemed to hold voting and dispositive power with regard to the reported shares held by the GRAT.

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