O'Connor Oliver 4

4 · AMARIN CORP PLC\UK · Filed Apr 21, 2026

AI-generated summary of this filing

Updated Apr 21, 2026

Amarin (AMRN) Director O'Connor Exercises Derivatives, 438 Shares Withheld

What Happened

Director O'Connor exercised/converted derivatives to acquire a total of 1,676 shares (two separate M transactions of 838 shares each). As part of the vesting/settlement, 438 shares were withheld/disposed to cover the tax liability at $14.98 per share, producing $6,561 in proceeds (F transaction). One exercise line reports a $0.00 exercise price; another line lists the exercise price as N/A (see footnotes regarding ADS ratio adjustments).

Key Details

Transaction date: April 18, 2026.
Derivative exercises: two M transactions for 838 shares each (total 1,676 shares); one reported at $0.00 exercise price, one reported with price N/A.
Tax withholding/sale: 438 shares withheld/disposed at $14.98 for total reported proceeds of $6,561 (code F — tax withholding).
Shares owned after the transaction: not provided in the data supplied.
Footnotes of note:
- F1: Prior ADS ratio change (1 ADS = 20 Ordinary Shares) and proportionate award adjustments affected reported amounts.
- F2/F5: These transactions relate to RSUs granted April 18, 2024 (vest in installments); each RSU represents a contingent right to twenty Ordinary Shares (or cash).
- F4: The 438-share disposition was a withholding by the issuer to satisfy tax liability, not an open-market sale.
Filing date: Form filed April 21, 2026 (transaction reported for April 18, 2026).

Context

This appears to be a routine vesting/settlement event rather than an open-market investment or divestment: withheld shares were used to cover taxes, which is common and not the same signal as a voluntary market sale. The modest cash amount ($6.6k) indicates a small tax-withholding related disposition rather than a large insider sell-off.

Form 4

Period: 2026-04-18

Director

Transactions

Exercise/Conversion
American Depositary Shares
[F1][F2][F3]
2026-04-18+838→ 1,239 total
Tax Payment
American Depositary Shares
[F1][F4]
2026-04-18$14.98/sh−438$6,561→ 801 total
Exercise/Conversion
Restricted Stock Unit
[F5][F1][F2][F3]
2026-04-18+838→ 838 total
Exercise: $0.00→ American Depositary Shares (838 underlying)

Footnotes (5)

[F1]Effective April 11, 2025, the Issuer implemented a ratio change that one (1) American Depositary Share ("ADS") currently represents twenty (20) Ordinary Shares ("ADS Ratio Change"). Proportionate adjustments were made to the Issuer's outstanding equity awards. The amount of securities reported on this Form 4 reflect the ADS Ratio Change.
[F2]On April 18, 2024, following the conclusion of the Issuer's annual general meeting of shareholders for 2024, the Reporting Person was granted 2,514 RSUs under the Amarin Corporation plc 2020 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of April 18, 2025, April 18, 2026 and April 18, 2027.
[F3]Not applicable.
[F4]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.
[F5]Each RSU represents a contingent right to receive twenty Ordinary Shares or cash in lieu thereof at the Issuer's discretion.

Signature

/s/ Jonathan Provoost, by power of attorney|2026-04-21

1 file