Alkermes plc. — Director's Dealing 2013

Mar 21, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2013-03-20

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-20	Ordinary Shares	M	18747	$8.55	Acquired	28580	Direct
2013-03-20	Ordinary Shares	S	18747	$22.7481	Disposed	9833	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-20	Employee Stock Option (Right to Buy)	$8.55	M	18747	Disposed	2019-05-26	Ordinary Shares (18747)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	5000	Indirect
Ordinary Shares	15000	Indirect

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: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $22.61 to $22.88. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: 75% vested, remaining 25% vests on 5/26/13.