Diane E. Sullivan - 18 Apr 2026 Form 4 Insider Report for AMARIN CORP PLC\UK (AMRN)

Reporting relationship: Director
Issuer ticker: AMRN
Reported as of: 18 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 Apr 2026, 17:00:04 UTC
Prior SEC filing: 03 Jun 2025
Next SEC filing: 04 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Jonathan Provoost, by power of attorney

Key filing fact

Diane E. Sullivan filed Form 4 for AMARIN CORP PLC\UK (AMRN) on 21 Apr 2026.

Key facts

This page summarizes Diane E. Sullivan's Form 4 filing for AMARIN CORP PLC\UK (AMRN).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 21 Apr 2026, 17:00.

Change

Previous filing in this sequence was filed on 03 Jun 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001968736 Primary reporting owner

Sullivan Diane E.

Relationship: Director
Address: C/O AMARIN PHARMA, INC., 440 US HIGHWAY 22, BRIDGEWATER
Signature: /s/ Jonathan Provoost, by power of attorney
Signature date: 21 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMRN transaction

American Depositary Shares

Options Exercise

Transaction value
Shares: +838
Change %: +209%
Price
Shares after: 1,239
Date: 18 Apr 2026
Ownership: Direct
Footnotes: F1, F2, F3

AMRN transaction

American Depositary Shares

Tax liability

Transaction value
Shares: -403
Change %: -33%
Price: $14.98^*
Shares after: 836
Date: 18 Apr 2026
Ownership: Direct
Footnotes: F1, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AMRN transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value
Shares: +838
Change %
Price: $0.000000^*
Shares after: 838
Date: 18 Apr 2026
Ownership: Direct
Underlying class: American Depositary Shares
Underlying amount: 838
Exercise price: $0.000000
Footnotes: F1, F2, F3, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote 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.

Footnote 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.

Footnote F3

Not applicable.

Footnote 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.

Footnote F5

Each RSU represents a contingent right to receive twenty Ordinary Shares or cash in lieu thereof at the Issuer's discretion.