Alkermes plc. — Director's Dealing 2012

Feb 3, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-02-01

Reporting Person: BREYER ROBERT A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-01	Common Stock	M	5000	$8.98	Acquired	63106	Direct
2012-02-01	Common Stock	S	5000	$18.99	Disposed	58106	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-01	Non Qualified Stock Option (Right to Buy)	$8.98	M	5000	Disposed	2019-10-06	Common Stock (5000)	Direct

Footnotes

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.