Alkermes plc. — Director's Dealing 2011

Oct 31, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2011-10-28

Reporting Person: BREYER ROBERT A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-10-28	Common Stock	M	3025	$7.19	Acquired	64156	Direct
2011-10-28	Common Stock	S	3025	$18.00	Disposed	61131	Direct
2011-10-28	Common Stock	S	3025	$18.00	Disposed	58106	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-10-28	Non Qualified Stock Option (Right to Buy)	$7.19	M	3025	Disposed	2012-09-18	Common Stock (3025)	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.