Alkermes plc. - Director's Dealing 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2017-01-03

Reporting Person: Gaffin David Joseph (SVP, CLO, Alkermes, Inc.)

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-01-03	Ordinary Shares	M	2250	$15.95	Acquired	27207	Direct
2017-01-03	Ordinary Shares	M	250	$14.13	Acquired	27457	Direct
2017-01-03	Ordinary Shares	S	2500	$55.40	Disposed	24957	Direct

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-01-03	Employee Stock Option (Right to Buy)	$15.95	M	2250	Disposed	2017-06-01	Ordinary Shares (2250)	Direct
2017-01-03	Employee Stock Option (Right to Buy)	$14.13	M	250	Disposed	2017-11-05	Ordinary Shares (250)	Direct

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