Equity

9 Months Ended

Sep. 30, 2025

Equity [Abstract]

Equity

(6) Equity

ADSs

On April 11, 2025, the Company effected its ADS Ratio Change on its ADSs from one ADS representing one Ordinary Share, to the new ratio of one ADS representing 20 Ordinary Shares.

During the nine months ended September 30, 2025 and 2024, except as described above, the Company did not engage in any transactions involving its ADSs. Refer to Incentive Equity Awards below for discussions of Ordinary Shares issued as a result of stock option exercises and vesting of RSUs.

Ordinary Shares

There was no Ordinary Share activity during the nine months ended September 30, 2025 and 2024, except as described in Incentive Equity Awards below.

Incentive Equity Awards

The following table summarizes the aggregate number of Ordinary Shares underlying stock options and RSUs outstanding under the Amarin Corporation plc 2020 Stock Incentive Plan, as amended, or the 2020 Plan, as of September 30, 2025:

	September 30, 2025
Outstanding stock options		30,768,706
% of outstanding on a fully-diluted basis		7	%
Outstanding RSUs		14,726,029
% of outstanding on a fully-diluted basis		4	%

The following table represents equity awards activity during the nine months ended September 30, 2025 and 2024:

	Nine months ended September 30,
	2025		2024
Ordinary Shares issued for stock option exercises		—		9,500
Gross and net proceeds from stock option exercises	$	—	$	10,260
Ordinary Shares issued in settlement of vested RSUs		7,083,019		3,218,757
Ordinary Shares retained for settlement of employee tax obligations ─ RSUs		2,939,015		1,188,171
Ordinary Shares issued in settlement of vested Performance-based RSUs (1)		257,500		484,897
Ordinary Shares retained for settlement of employee tax obligations ─ Performance-based RSUs		117,898		227,380

(1)Performance-based RSUs vested in connection with the achievement of certain performance conditions during the year.

In June 2025, the Company granted to Aaron Berg (i) RSUs for 1,500,000 Ordinary Shares that vested upon the date of grant; and (ii) stock options and RSUs of 750,000 and 250,000 Ordinary Shares that vest 50% on both June 26, 2026 and December 26, 2026, respectively.

In January 2025, the Company granted RSUs for a total of 10,646,844 Ordinary Shares and stock options for a total of 3,313,059 Ordinary Shares to employees under the 2020 Plan. The RSUs and stock options vest 50% on both January 1, 2026 and July 1, 2026, respectively.

In July 2024, the Company granted stock options for 5,000,000 Ordinary Shares to Aaron Berg in connection with his appointment as President and Chief Executive Officer, which will vest upon achievement of specified stock price conditions for the Company.

In April 2024, the Company granted RSUs for a total of 492,296 Ordinary Shares and stock options for a total of 1,438,360 Ordinary Shares to members of the Company's Board of Directors. The RSUs vest annually over a three-year period and the stock options vest quarterly over a four-year period with a one-year cliff vesting.

In February 2024, the Company granted RSUs for a total of 6,800,500 Ordinary Shares and stock options for a total of 2,662,000 Ordinary Shares to employees under the 2020 Plan. The RSUs vest annually over a three-year period and the stock options vest quarterly over a four-year period with a one-year cliff vesting.