X0306 4 2022-07-29 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 2022-07-29 4 M false 23884.00 A 419336.00 D Ordinary Shares 2022-07-29 4 F false 8181.00 1.33 D 411155.00 D Restricted Stock Units 0.00 2022-07-29 4 M false 23884.00 0.00 D Ordinary Shares 23884.00 47766.00 D The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share. On August 2, 2021, the Reporting Person was granted 71,650 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2020 Stock Incentive Plan. These RSUs vest in three equal installments on each of July 31, 2022, July 31, 2023 and July 31, 2024. As the first vesting date fell on a weekend, the first vesting event occurred on July 29, 2022, the previous business day. Not applicable. Includes 3,368 shares purchased under the Issuer's 2017 Employee Stock Purchase Plan on May 31, 2022. 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 grant described in this Form 4 vests in full. As of the date of this Form 4, the Reporting Person owns or holds the right to acquire an aggregate of 1,791,219 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/ Jason Marks, by power of attorney 2022-08-02