Alkermes plc. — Director's Dealing 2011

Nov 21, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2011-11-18

Reporting Person: Ehrich Elliot (SVP, R&D & CMO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-11-18	Common Stock	M	5000	—	Acquired	23079	Direct
2011-11-18	Common Stock	F	1588	$15.00	Disposed	21491	Direct
2011-11-21	Common Stock	S	3412	$14.6598	Disposed	18079	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-11-18	Restricted Stock Award	$0	M	5000	Disposed		Common Stock (5000)	Direct

Footnotes

F1: This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $14.61 to $14.74. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F3: 50% vested as of 11/18/11, remainder vests in 2 equal annual installments beginning on 11/18/12.