Alkermes plc. - Director's Dealing 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2013-01-07

Reporting Person: MITCHELL PAUL J (Director)

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-01-07	Ordinary Shares	M	11000	$9.91	Acquired	19000	Direct
2013-01-07	Ordinary Shares	M	8000	$9.91	Acquired	27000	Direct
2013-01-07	Ordinary Shares	S	19000	$21.00	Disposed	8000	Direct

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-01-07	Non Qualified Stock Option (Right to Buy)	$9.91	M	11000	Disposed	2013-04-24	Ordinary Shares (11000)	Direct
2013-01-07	Non Qualified Stock Option (Right to Buy)	$9.91	M	8000	Disposed	2013-04-24	Ordinary Shares (8000)	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.