X0306 4 2018-02-01 0 0000897448 AMARIN CORP PLC\UK AMRN 0001725833 Salyer Mark C/O AMARIN PHARMA, INC. 1430 ROUTE 206 BEDMINSTER NJ 07921 0 1 0 0 Chief Commercial Officer Restricted Stock Units 0.00 2018-02-01 4 A 0 78000 0.00 A Ordinary Shares 78000 78000 D Stock Options (Right to Buy) 3.80 2018-02-01 4 A 0 117000 3.80 A 2028-02-01 Ordinary Shares 117000 117000 D Each Restricted Stock Unit ("RSU") represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion. On February 1, 2018, the Reporting Person was granted 78,000 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in three equal installments on each of January 31, 2019, January 31, 2020 and January 31, 2021. Not applicable. The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share. On February 1, 2018, the Reporting Person was granted an option to purchase 117,000 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, 2018. As of the date of this Form 4, the Reporting Person owns or holds the right to acquire an aggregate of 1,115,000 Ordinary Shares of the Issuer in the form of stock options and Restricted Stock Units granted under the Amarin Corporation plc 2011 Stock Incentive Plan. The above-referenced stock option and RSU awards were approved by the Issuer's remuneration committee, in consultation with an independent executive compensation consultant, as part of the Issuer's annual review of executive compensation matters and were benchmarked against the Issuer's pre-defined peer group at the 50th percentile level for long-term incentive awards and other market data. In the event of a Change of Control (as defined in the Plan), the grants described in this Form 4 vest in full. /s/ Joseph Kennedy, by power of attorney 2018-02-02