AMARIN CORP PLC\UK — Director's Dealing 2017

Oct 3, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2017-09-30

Reporting Person: THERO JOHN F (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-09-30	Ordinary Shares	M	37500	—	Acquired	1140735	Direct
2017-09-30	Ordinary Shares	F	15732	$3.50	Disposed	1125003	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-09-30	Restricted Stock Units	$0.00	M	37500	Disposed		Ordinary Shares (37500)	Direct

Footnotes

F1: The Ordinary Shares may be represented by American Depositary Shares, each of which represents one Ordinary Share.

F2: As previously reported on July 8, 2015, the Reporting Person was granted 600,000 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in 16 equal quarterly installments. The ninth vesting event occurred on September 30, 2017.

F3: Not applicable.

F4: Please see the section titled "Remarks" below for additional information.

F5: Represents a withholding by the Issuer of shares in respect of tax liability incident to the vesting of a security issued in accordance with Rule 16b-3, and not a market sale of securities.

F6: Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.