Alkermes plc. — Director's Dealing 2015

Dec 23, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2015-12-23

Reporting Person: Cooke Shane (President, Alkermes plc)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-12-23	Ordinary Shares	M	18000	$14.60	Acquired	68240	Direct
2015-12-23	Ordinary Shares	S	8500	$76.7314	Disposed	59740	Direct
2015-12-23	Ordinary Shares	S	9500	$77.6715	Disposed	50240	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-12-23	Employee Stock Option (Right to Buy)	$14.60	M	18000	Disposed	2021-10-05	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 $76.09 to $77.01. 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 $77.18 to $77.96. 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.