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Equity | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Equity | (8) Equity Common Stock On January 10, 2024, the Company announced plans to initiate a share repurchase program to purchase up to $50.0 million of the Company's ordinary shares held in the form of American Depository Shares. The implementation of the share repurchase program will require shareholder approval as well as UK High Court approval, as required under UK company law. On July 13, 2022, in connection with the United Kingdom's National Institute for Health and Care Excellence, or NICE's, final guidance for reimbursement of VAZKEPA and use across the National Health Service, or NHS, in England and Wales, representing receipt of marketing approval in Europe for the first indication for VAZKEPA, the Company became obligated to make an aggregate milestone payment of £7.5 million to Laxdale's former shareholders (in either stock or cash at the election of each shareholder) under the 2004 purchase agreement among the Company and such former shareholders. One of the shareholders elected to receive payment in stock for its pro rata portion of the milestone payment, resulting in the issuance of 5,817,942 shares at a price of $1.41 per share in July 2022. During the years ended December 31, 2023 and 2022, other than as described elsewhere in this Annual Report on Form 10-K, including in the Notes to Consolidated Financial Statements, the Company did not engage in any transactions involving its common stock. Refer to Incentive Equity Awards below for discussion of ordinary shares issued as a result of stock option exercises and the vesting of restricted stock units. Refer to Note 9—Stock Incentive Plans and Stock Based Compensation for discussion of shares issued under the Company’s employee stock purchase plan. Incentive Equity Awards The Company issues incentive equity awards, including incentive and non-qualified stock options and restricted stock units, under the Amarin Corporation plc 2020 Stock Incentive Plan, or the 2020 Plan, which is the successor to the Amarin Corporation plc 2011 Stock Incentive Plan, as amended, or the 2011 Plan, and the Amarin Corporation plc 2002 Stock Option Plan, as amended, or the 2002 Plan, and together with the 2020 Plan and 2011 Plan, the Plans. Refer to Note 9—Stock Incentive Plans and Stock Based Compensation for further information regarding the Company’s incentive equity plans and awards. The following table summarizes the aggregate number of stock options and restricted stock units, or RSUs, outstanding under the 2020 Plan as of December 31, 2023:
| December 31, 2023 |
Outstanding stock options |  | 27,956,138 |
% of outstanding shares on a fully diluted basis |  | 6 | %
Outstanding RSUs |  | 11,983,101 |
% of outstanding shares on a fully diluted basis |  | 3 | %
The following table represents equity awards activity during the years ended December 31, 2023 and 2022:
| For the Year Ended December 31, |
| 2023 |  |  | 2022 |
Common shares issued for stock option exercises |  | 1,239,763 |  |  |  | 33,303 |
Gross and net proceeds from stock option exercises | $ | 1,882,001 |  |  | $ | 59,686 |
Common shares issued in settlement of vested RSUs |  | 3,890,395 |  |  |  | 1,940,371 |
Shares retained for settlement of employee tax obligations ─ RSUs |  | 1,187,251 |  |  |  | 500,064 |
Common shares issued in settlement of vested Performance-Based RSUs (1) |  | 358,440 |  |  |  | — |
Shares retained for settlement of employee tax obligations ─ Performance-Based RSUs |  | 143,120 |  |  |  | — |
(1) Performance-based RSUs vested in connection with the achievement of certain performance conditions. These performance-based RSUs will primarily vest over a three-year period based on continuous service from the grant date. During the years ended December 31, 2023 and 2022, the Company granted a total of 5,456,800 and 3,065,000 stock options, respectively, and 8,227,800 and 9,069,500 RSUs, respectively, to employees under the Plans. The RSUs typically vest annually over a three- or four-year period and the stock options typically vest quarterly over a four-year period. Also during 2023 and 2022, the Company granted a total of 1,368,800 and 1,919,500 RSUs, respectively, to employees under the Plans that vest upon the achievement of specified performance conditions. In addition to the grants noted above, in connection with the implementation of a retention program in July 2023, the Company granted a total of 3,978,300 stock options to employees under the 2020 Plan. The options vest 50% on both January 1, 2024 and January 1, 2025, respectively. Also in July 2023, the Company granted 5,000,000 stock options to Patrick Holt in connection with his appointment as President and Chief Executive Officer, which will vest upon achievement of specified stock price conditions for the Company. During the years ended December 31, 2023 and 2022, the Company granted a total of 3,853,025 and 1,973,124 stock options, respectively, and 1,392,257 and 1,597,955 RSUs, respectively, to members of the Company’s Board of Directors under the Plans. The RSUs vest in equal installments over a three-year period upon the earlier of the anniversary of the grant date or the Company’s annual general meeting of shareholders in such anniversary year. The stock options vest in full upon the earlier of the one-year anniversary of the grant date or the Company’s annual general meeting of shareholders in such anniversary year. Upon termination of service to the Company or upon a change of control, each director shall be entitled to a payment equal to the fair market value of one share of Amarin common stock per award vested or granted, respectively, which is required to be made in shares.

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