AMARIN CORP PLC\UK — Director's Dealing 2017

Feb 2, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2017-01-31

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-01-31	Ordinary Shares	M	169500	—	Acquired	911417	Direct
2017-01-31	Ordinary Shares	M	260000	—	Acquired	1171417	Direct
2017-01-31	Ordinary Shares	M	120000	—	Acquired	1291417	Direct
2017-01-31	Ordinary Shares	F	231718	$2.97	Disposed	1059699	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-01-31	Restricted Stock Units	$0.00	M	169500	Disposed		Ordinary Shares (169500)	Direct
2017-01-31	Restricted Stock Units	$0.00	M	260000	Disposed		Ordinary Shares (260000)	Direct
2017-01-31	Restricted Stock Units	$0.00	M	120000	Disposed		Ordinary Shares (120000)	Direct
2017-02-01	Stock Option (right to buy)	$2.95	A	550000	Acquired	2027-01-31	Ordinary Shares (550000)	Direct

Footnotes

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

F2: On January 8, 2014, the Reporting Person was granted 508,500 restricted stock units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2015, January 31, 2016 and January 31, 2017. The third and final vesting event occurred on January 31, 2017.

F3: Not applicable.

F4: On February 2, 2015, the Reporting Person was granted 780,000 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2016, January 31, 2017 and January 31, 2018. The second vesting event occurred on January 31, 2017.

F5: On February 1, 2016, the Reporting Person was granted 360,000 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2017, January 31, 2018 and January 31, 2019. The first vesting event occurred on January 31, 2017.

F6: Represents 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.

F7: Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.

F8: On February 1, 2017, the Reporting Person was granted an option to purchase 550,000 Ordinary Shares under the Amarin Corporation plc 2011 Stock Incentive Plan. The shares subject to this option shall vest and become exercisable in 48 equal monthly installments on the last day of each month starting on February 28, 2017.