X0306 4 2019-12-16 0 0000897448 AMARIN CORP PLC\UK AMRN 0001331852 Zakrzewski Joseph S C/O AMARIN PHARMA, INC. 440 US HIGHWAY 22 BRIDGEWATER NJ 08807 1 0 0 0 Ordinary Shares 2019-12-16 4 M 0 100000 9.00 A 184547 D Ordinary Shares 2019-12-16 4 S 0 100000 25.8338 D 84547 D Stock Option (Right to Buy) 9.00 2019-12-16 4 M 0 100000 0.00 A 2021-10-20 Ordinary Shares 100000 138542 D The option exercises and sale transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person. The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.80 to $25.90, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. Please see the section title "Remarks" below for additional information. The stock option granted to the Reporting Person is fully vested as of the date hereof. This number does not represent the aggregate number of Ordinary Shares of the Issuer this Reporting Person holds or has a right to acquire in the form of stock options and restricted stock units granted to such Reporting Person. /s/ Joseph Kennedy, by power of attorney 2019-12-18