Alkermes plc. — Director's Dealing 2013

Jan 17, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2013-01-17

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-01-17	Ordinary Shares	M	48747	$8.55	Acquired	76627	Direct
2013-01-17	Ordinary Shares	M	40000	$11.47	Acquired	116627	Direct
2013-01-17	Ordinary Shares	S	88747	$22.0891	Disposed	27880	Direct
2013-01-17	Ordinary Shares	S	11301	$22.0891	Disposed	16579	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-01-17	Employee Stock Option (Right to Buy)	$8.55	M	48747	Disposed	2019-05-26	Ordinary Shares (48747)	Direct
2013-01-17	Employee Stock Option (Right to Buy)	$11.74	M	40000	Disposed	2020-05-17	Ordinary Shares (40000)	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 $21.95 to $22.22. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: 50% vested as of 9/16/11, remainder vests in 2 equal annual installments beginning on 5/26/12.

F5: 25% vested as of 9/16/11, remainder vests in 3 equal annual installments beginning on 5/17/12.