Alkermes plc. — Director's Dealing 2012

Jan 31, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-01-27

Reporting Person: POPS RICHARD F (Director, Director and CEO, Alkermes plc)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-01-27	Common Stock	M	25000	—	Acquired	348727	Direct
2012-01-27	Common Stock	F	8045	$19.10	Disposed	340682	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-01-27	Restricted Stock Award	$0	M	25000	Disposed	2014-05-26	Common Stock (25000)	Direct

Footnotes

F1: On May 26, 2009, the reporting person was granted a restricted stock unit award for 25,000 ordinary shares. The restricted stock unit award vests in full upon the satisfaction of certain performance criteria. In January 2012, the performance criteria were met, resulting in the full vesting of the restricted stock unit award.