Alkermes plc. — Director's Dealing 2014

May 22, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2014-05-20

Reporting Person: Ehrich Elliot (SVP, R&D & CMO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-05-20	Ordinary Shares	M	3750	—	Acquired	24742	Direct
2014-05-20	Ordinary Shares	F	1769	$43.98	Disposed	22973	Direct
2014-05-21	Ordinary Shares	S	1981	$43.9981	Disposed	20992	Direct
2014-05-21	Ordinary Shares	M	4500	—	Acquired	25492	Direct
2014-05-21	Ordinary Shares	F	2122	$44.48	Disposed	23370	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-05-20	Restricted Stock Unit Award	$0	M	3750	Disposed		Ordinary Shares (3750)	Direct
2014-05-21	Restricted Stock Unit Award	$0	M	4500	Disposed		Ordinary Shares (4500)	Direct

Footnotes

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

F2: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $43.75 to $44.26. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F3: Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/20/12.

F4: Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/21/13.