AMARIN CORP PLC\UK — Director's Dealing 2023

Jul 21, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMARIN CORP PLC\UK (AMRN)
CIK: 0000897448
Period of Report: 2023-07-21

Reporting Person: Horn Keith (N/A)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-07-21	Stock Option (Right to Buy)	$1.12	A	284598	Acquired	2033-07-21	Ordinary Shares (284598)	Direct
2023-07-21	Stock Option (Right to Buy)	$1.12	A	167411	Acquired	2033-07-21	Ordinary Shares (167411)	Direct
2023-07-21	Restricted Stock Units	$0.00	A	94866	Acquired		Ordinary Shares (94866)	Direct
2023-07-21	Restricted Stock Units	$0.00	A	55804	Acquired		Ordinary Shares (55804)	Direct

Footnotes

F1: In connection with the Reporting Person's initial appointment to the Issuer's board of directors, on July 21, 2023 the Reporting Person was granted a one-time option to purchase 284,598 Ordinary Shares under the Amarin Corporation plc 2020 Stock Incentive Plan (the "Plan") and the Non-Employee Director Compensation Policy, as revised in May 2023 (the "Policy"). This option shall vest and become exercisable in equal annual installments over three years from the date of the Reporting Person's initial appointment to the Issuer's board of directors.

F2: The Ordinary Shares may be represented by American Depositary Shares, each of which currently represents one Ordinary Share.

F3: On July 21, 2023, following the conclusion of the Issuer's annual general meeting of shareholders for 2023, the Reporting Person was granted an option to purchase 167,411 Ordinary Shares under the Plan and the Policy. This option shall vest and become exercisable upon the earlier of the one-year anniversary of the grant date and the annual general meeting of shareholders in such anniversary year.

F4: Each Restricted Stock Unit ("RSU") represents a contingent right to receive one Ordinary Share or cash in lieu thereof at the Issuer's discretion.

F5: In connection with the Reporting Person's initial appointment to the Issuer's board of directors, on July 21, 2023 the Reporting Person was granted a one-time grant of 94,866 RSUs under the Plan and the Policy. These RSUs vest in equal annual installments over three years from the date of the Reporting Person's initial appointment to the Issuer's board of directors. The RSUs are subject to deferred settlement upon the director's separation of service with the Issuer.

F6: Not applicable.

F7: On July 21, 2023, following the conclusion of the Issuer's annual general meeting of shareholders for 2023, the Reporting Person was granted an award of 55,804 RSUs under the Plan and the Policy. These RSUs vest in full upon the earlier of the one-year anniversary of the grant date and the annual general meeting of shareholders in such anniversary year. The RSUs are subject to deferred settlement upon the director's separation of service with the Issuer.