Alkermes plc. - Director's Dealing 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2013-01-31

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

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-01-31	Ordinary Shares	M	177	$14.38	Acquired	16756	Direct
2013-01-31	Ordinary Shares	M	6323	$14.38	Acquired	23079	Direct
2013-01-31	Ordinary Shares	S	6500	$23.00	Disposed	16579	Direct

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-01-31	Incentive Stock Option (Right to Buy)	$14.38	M	177	Disposed	2016-12-12	Ordinary Shares (177)	Direct
2013-01-31	Non Qualified Stock Option (Right to Buy)	$14.38	M	6323	Disposed	2016-12-12	Ordinary Shares (6323)	Direct

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

F2: This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3: These options are fully vested in accordance with their terms.