X0306 4 2016-09-30 0 0000897448 AMARIN CORP PLC\UK AMRN 0001408920 Kennedy Joseph T C/O AMARIN PHARMA, INC. 1430 ROUTE 206 BEDMINSTER NJ 07921 0 1 0 0 General Counsel Ordinary Shares 2016-09-30 4 M 0 47188 A 306113 D Ordinary Shares 2016-09-30 4 M 0 6250 A 312363 D Ordinary Shares 2016-09-30 4 F 0 27885 3.19 D 284478 D Restricted Stock Units 0.00 2016-09-30 4 M 0 47188 0.00 D Ordinary Shares 47188 519062 D Restricted Stock Units 0.00 2016-09-30 4 M 0 6250 0.00 D Ordinary Shares 6250 68750 D The Ordinary Shares may be represented by American Depositary Shares, each of which represents one Ordinary Share. As previously reported on July 8, 2015, the Reporting Person was granted 755,000 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest in 16 equal quarterly installments. The fifth vesting event occurred on September 30, 2016. Not applicable. As previously reported on October 6, 2015, the Reporting Person was granted 100,000 RSUs under the Plan. These RSUs vest in 16 equal quarterly installments. The fifth vesting event occurred on September 30, 2016. 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. Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion. 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 T. Kennedy 2016-09-30