Alkermes plc. — Director's Dealing 2015

Dec 2, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2015-12-01

Reporting Person: Stejbach Mark (Chief Commercial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-12-01	Ordinary Shares	M	18000	$17.30	Acquired	37564	Direct
2015-12-01	Ordinary Shares	S	15200	$71.9943	Disposed	22364	Direct
2015-12-01	Ordinary Shares	S	2300	$73.0891	Disposed	20064	Direct
2015-12-01	Ordinary Shares	S	500	$73.582	Disposed	19564	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-12-01	Employee Stock Option (Right to Buy)	$17.30	M	18000	Disposed	2022-03-07	Ordinary Shares (18000)	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 $71.39 to $72.34. 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 $72.47 to $73.46. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F5: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $73.48 to $73.67. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F6: The option becomes exercisable in equal annual installments over a four year period, at the rate of 25% per year commencing on 3/7/13.