Alkermes plc. — Director's Dealing 2012

Feb 3, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-02-01

Reporting Person: LANDINE MICHAEL J (SVP, Corp Dev., Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-01	Common Stock	M	5000	$4.77	Acquired	106951	Direct
2012-02-01	Common Stock	S	5000	$18.9474	Disposed	101951	Direct
2012-02-01	Common Stock	M	7500	$7.36	Acquired	109451	Direct
2012-02-01	Common Stock	S	7500	$18.9474	Disposed	101951	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-01	Incentive Stock Option (Right to Buy)	$4.77	M	5000	Disposed	2012-07-18	Common Stock (5000)	Direct
2012-02-01	Incentive Stock Option (Right to Buy)	$7.36	M	7500	Disposed	2012-12-12	Common Stock (7500)	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: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $18.83 to $19.075. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: These options are fully vested in accordance with their terms.