Alkermes plc. — Director's Dealing 2015

Jun 1, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2015-05-28

Reporting Person: Peterson Rebecca (SVP, Corporate Communications)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-28	Ordinary Shares	M	20000	$33.72	Acquired	20000	Direct
2015-05-28	Ordinary Shares	S	19800	$59.971	Disposed	200	Direct
2015-05-28	Ordinary Shares	S	200	$60.705	Disposed	0	Direct
2015-05-28	Ordinary Shares	M	3750	—	Acquired	3750	Direct
2015-05-28	Ordinary Shares	F	1767	$59.92	Disposed	1983	Direct
2015-06-01	Ordinary Shares	S	1983	$60.78	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-28	Employee Stock Option (Right to Buy)	$33.72	M	20000	Disposed	2023-05-28	Ordinary Shares (20000)	Direct
2015-05-28	Restricted Stock Unit Award	$0	M	3750	Disposed		Ordinary Shares (3750)	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 $59.50 to $60.39. 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 $60.70 to $60.71. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F5: Shares subject to the stock option award vest in four equal annual installments commencing on 5/28/14.

F6: Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/28/14.