X0306 4 2021-12-31 false 0000897448 AMARIN CORP PLC\UK AMRN 0001770259 Berg Aaron C/O AMARIN PHARMA, INC. 440 US HIGHWAY 22 BRIDGEWATER NJ 08807 false true false false EVP, President US Ordinary Shares 2021-12-31 4 M false 47767.00 A 363018.00 D Restricted Stock Units 0.00 2021-12-31 4 M false 47767.00 0.00 D Ordinary Shares 47767.00 95533.00 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. The first vesting event occurred on December 31, 2021. Not applicable. 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. As of the date of this Form 4, the Reporting Person owns or holds the right to acquire an aggregate of 1,488,032 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/ Michael W. Kalb, by power of attorney 2022-01-04