Alkermes plc. — Director's Dealing 2016

Mar 1, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2016-02-26

Reporting Person: Pugh Gordon G (SVP, COO & CRO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-02-26	Ordinary Shares	M	3125	—	Acquired	5769	Direct
2016-02-26	Ordinary Shares	F	1015	$33.61	Disposed	4754	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-02-26	Restricted Stock Unit Award	$0	M	3125	Disposed		Ordinary Shares (3125)	Direct
2016-02-29	Employee Stock Option (Right to Buy)	$32.27	A	85000	Acquired	2026-02-28	Ordinary Shares (85000)	Direct
2016-02-29	Restricted Stock Unit Award	$0	A	21000	Acquired		Ordinary Shares (21000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	47781	Indirect
Ordinary Shares	6989	Indirect
Ordinary Shares	13101	Indirect

Footnotes

F1: Shares held by KAS Grantor Retained Annuity Trust dated December 16, 2014 (the "GRAT"). The Reporting Person's spouse is a trustee and beneficiary of the GRAT.

F2: Includes 2,201 shares received on December 29, 2015 pursuant to an annuity payment from the KAS Grantor Retained Annuity Trust dated December 16, 2014 (the "GRAT"), which was exempt from reporting obligations by virtue of Rule 16a-13 promulgated under the Securities Exchange Act of 1934, as amended.

F3: Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing 2/26/2016.

F4: Shares subject to the stock option award vest in four equal annual installments commencing on 3/1/2017.

F5: Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing 3/1/2017.