Alkermes plc. — Director's Dealing 2019

May 23, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2019-05-22

Reporting Person: LANDINE MICHAEL J (SVP, Corp Dev., Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-22	Ordinary Shares	M	8304	$8.55	Acquired	193426	Direct
2019-05-22	Ordinary Shares	M	11696	$8.55	Acquired	205122	Direct
2019-05-22	Ordinary Shares	S	20000	$24.9266	Disposed	185122	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-05-22	Employee Stock Option (Right to Buy)	$8.55	M	8304	Disposed	2019-05-26	Ordinary Shares (8304)	Direct
2019-05-22	Employee Stock Option (Right to Buy)	$8.55	M	11696	Disposed	2019-05-26	Ordinary Shares (11696)	Direct

Footnotes

F1: This option exercise was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 3/2/18.

F2: This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 3/2/18.

F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $24.78 to $25.07. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: These options are fully vested in accordance with their terms.