Alkermes plc. — Director's Dealing 2015

Nov 4, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2015-11-02

Reporting Person: Stejbach Mark (Chief Commercial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-11-02	Ordinary Shares	M	18000	$17.30	Acquired	37964	Direct
2015-11-02	Ordinary Shares	S	15670	$71.9993	Disposed	22294	Direct
2015-11-02	Ordinary Shares	S	2330	$72.5062	Disposed	19964	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-11-02	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 $72.375. 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 $72.40 to $72.72. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F5: 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.