Alkermes plc. — Director's Dealing 2013

Apr 18, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2013-04-16

Reporting Person: BIBERSTEIN KATHRYN L (SVP, GC, Secretary, Alks, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-04-16	Ordinary Shares	M	18000	$12.16	Acquired	60665	Direct
2013-04-16	Ordinary Shares	S	18000	$25.5841	Disposed	42665	Direct
2013-04-17	Ordinary Shares	M	21500	$12.16	Acquired	64165	Direct
2013-04-17	Ordinary Shares	S	21500	$28.1209	Disposed	42665	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-04-16	Non Qualified Stock Option (Right to Buy)	$12.16	M	18000	Disposed	2013-12-10	Ordinary Shares (18000)	Direct
2013-04-17	Non Qualified Stock Option (Right to Buy)	$12.16	M	21500	Disposed	2013-12-10	Ordinary Shares (21500)	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 $25.56 to $25.62. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.00 to $28.35. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F5: These options are fully vested in accordance with their terms.