Alkermes plc. — Director's Dealing 2018

Feb 28, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2018-02-26

Reporting Person: BIBERSTEIN KATHRYN L (EVP/CAO/CCO/CRO Alks Inc;)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-02-26	Ordinary Shares	M	3750	—	Acquired	35818	Direct
2018-02-26	Ordinary Shares	F	1105	$58.12	Disposed	34713	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-02-26	Restricted Stock Unit Award	$0	M	3750	Disposed		Ordinary Shares (3750)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	28856	Indirect
Ordinary Shares	113017	Indirect

Footnotes

F1: Shares held by the Kathryn L. Biberstein 2016 Annuity Trust dated December 9, 2016 (the "2016 GRAT"). The Reporting Person is a trustee and beneficiary of the 2016 GRAT and may be deemed to hold voting and dispositive power with regard to the reported shares held by the 2016 GRAT.

F2: Shares held by the Kathryn L. Biberstein 2017 Annuity Trust dated December 11, 2017 (the "2017 GRAT"). The Reporting Person is a trustee and beneficiary of the 2017 GRAT and may be deemed to hold voting and dispositive power with regard to the reported shares held by the 2017 GRAT.

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