[Form 3] AMARIN CORP PLC\UK Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Amarin Corporation plc (AMRN) — Initial insider ownership filed. The company’s EVP and Chief Operating Officer filed a Form 3 as of 10/17/2025, reporting 7,950 American Depositary Shares (ADS) held directly.

Reported derivative holdings include Restricted Stock Units covering 6,740, 5,800, and 7,376 ADS, and stock options for 33,193 ADS at $12.4 expiring 01/10/2035, 20,900 ADS at $24.2 expiring 02/01/2034, 13,480 ADS at $36 expiring 02/21/2033, and 5,000 ADS at $29 expiring 06/01/2032. The filing notes an April 11, 2025 ADS ratio change where 1 ADS represents 20 Ordinary Shares, with equity awards adjusted accordingly. RSU and option grants vest on schedules described, generally in annual or quarterly tranches over 18 months to four years.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Keenan David Paul

(Last) (First) (Middle)

C/O AMARIN PHARMA, INC.

440 US HIGHWAY 22

(Street)

BRIDGEWATER NJ 08807

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/17/2025

3. Issuer Name and Ticker or Trading Symbol
AMARIN CORP PLC\UK [ AMRN ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Operating Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
American Depositary Share(1)	7,950	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units(2)	(3)	(4)	American Depositary Share(1)	6,740	$0	D
Restricted Stock Units(2)	(5)	(4)	American Depositary Share(1)	5,800	$0	D
Restricted Stock Units(2)	(6)	(4)	American Depositary Share(1)	7,376	$0	D
Stock Option (Right to Buy)	(7)	01/10/2035	American Depositary Share(1)	33,193	$12.4(8)	D
Stock Option (Right to Buy)	(9)	02/01/2034	American Depositary Share(1)	20,900	$24.2(8)	D
Stock Option (Right to Buy)	(10)	02/21/2033	American Depositary Share(1)	13,480	$36(8)	D
Stock Option (Right to Buy)	(11)	06/01/2032	American Depositary Share(1)	5,000	$29(8)	D

Explanation of Responses:

1. 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 3 reflect the ADS Ratio Change.

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

3. On February 21, 2023, the Reporting Person was granted 6,740 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of January 31, 2024, January 31, 2025 and January 31, 2026.

4. Not applicable.

5. On February 1, 2024, the Reporting Person was granted 5,800 RSUs under the Plan. These RSUs vest in three equal installments on each of January 31, 2025, January 31, 2026 and January 31, 2027.

6. On January 10, 2025, the Reporting Person was granted 7,376 RSUs under the Plan. These RSUs vest over eighteen months, with 50% to vest on the first anniversary of the grant date and the remaining balance to vest eighteen months after grant date.

7. On January 10, 2025, the Reporting Person was granted an option to purchase 33,193 Ordinary Shares under the Plan. The shares subject to this option shall vest and become exercisable over eighteen months, with 50% to vest on the first anniversary of the grant date and the remaining balance to vest eighteen months after grant date.

8. Grant price is set at the higher of (1) our nominal par value of 50 pence per share, as converted on date of grant, for which our Plan dictates under United Kingdom law, or (2) fair market value of stock price on the NASDAQ at close of business day.

9. On February 1, 2024, the Reporting Person was granted an option to purchase 20,900 Ordinary Shares under the Plan. The shares subject to this option shall vest and become exercisable over three years, with 33% to vest on the first anniversary of the grant date and the balance to vest ratably over the subsequent 8 calendar quarters on the last day of each April, July, October and January.

10. On February 21, 2023, the Reporting Person was granted an option to purchase 13,480 Ordinary Shares under the Plan. The shares subject to this option shall vest and become exercisable over three years, with 33% to vest on the first anniversary of the grant date and the balance to vest ratably over the subsequent 8 calendar quarters on the last day of each April, July, October and January.

11. On June 1, 2022, the Reporting Person was granted an option to purchase 5,000 Ordinary Shares under the Plan. The shares subject to this option shall vest and become exercisable over four years, with 25% to vest on the first anniversary of the grant date and the balance to vest ratably over the subsequent 12 calendar quarters on the last day of each April, July, October and January.

	/s/ Jonathan Provoost, by power of attorney	10/31/2025
	** Signature of Reporting Person	Date
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