X0306 4 2022-12-30 false 0000897448 AMARIN CORP PLC\UK AMRN 0001289884 Ketchum Steven B C/O AMARIN PHARMA, INC. 440 US HIGHWAY 22 BRIDGEWATER NJ 08807 false true false false Chief Scientific Officer Ordinary Shares 2022-12-30 4 M false 47767.00 A 560382.00 D Ordinary Shares 2022-12-30 4 F false 16361.00 1.21 D 544021.00 D Restricted Stock Units 0.00 2022-12-30 4 M false 47767.00 0.00 D Ordinary Shares 47767.00 47766.00 D The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share. On January 4, 2021, the Reporting Person was granted 143,300 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2020 Stock Incentive Plan (the "2020 Plan"). These RSUs vest in three equal installments on each of December 31, 2021, December 31, 2022 and December 31, 2023. As the second vesting date fell on a weekend, the second vesting event occurred on December 30, 2022, the previous business day. Not applicable. 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. Please see the section titled "Remarks" below for additional information. Each RSU represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion. In the case of a Change of Control (as defined in the Issuer's stock incentive plan), the grants described in this Form 4 vest in full. As of the date of this Form 4, the Reporting Person owns or holds the right to acquire an aggregate of 1,660,623 Ordinary Shares of the Issuer in the form of Ordinary Shares, stock options and RSUs outstanding under the Issuer's stock incentive plans, including but not limited to certain performance-based RSUs that are earned only if certain pre-defined operational milestones are achieved and, in certain cases, then vest only if the recipient remains with the company for an extended period of time. /s/ Tom Reilly, by power of attorney 2023-01-04