Alkermes plc. — Director's Dealing 2012

May 15, 2012

SEC Form 5 — Annual Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-03-31

Reporting Person: Pugh Gordon G (SVP, COO & CRO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-12	Ordinary Shares	G	15000	—	Disposed	11002	Direct
2012-03-12	Ordinary Shares	G	15000	—	Acquired	15000	Indirect
2012-03-12	Ordinary Shares	G	5000	—	Disposed	6002	Direct
2012-03-12	Ordinary Shares	G	5000	—	Acquired	5000	Indirect

Footnotes

F1: On March 12, 2012, the reporting person contributed 15,000 Alkermes plc ordinary shares to the Nancy E. Pugh Revocable Trust - 2012 of which the reporting person and his wife are both co-trustees and beneficiaries.

F2: On March 12, 2012, the reporting person contributed 5,000 Alkermes plc ordinary shares to the Gordon G. Pugh Revocable Trust - 2012 of which the reporting person and his wife are both co-trustees and beneficiaries.