Alkermes plc. — Director's Dealing 2015

Jan 8, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2015-01-07

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-01-07	Ordinary Shares	M	28374	$18.60	Acquired	108036	Direct
2015-01-07	Ordinary Shares	S	28374	$65.00	Disposed	79662	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-01-07	Non Qualified Stock Option (Right to Buy)	$18.60	M	28374	Disposed	2015-12-09	Ordinary Shares (28374)	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: These options are fully vested in accordance with their terms.