Amarin (AMRN) EVP Steven Ketchum reports RSU vesting, tax withholdings and new stock option grant

Rhea-AI Filing Summary

Amarin Corporation executive Steven B. Ketchum reported multiple equity compensation events and related share movements. On January 31, 2026, previously granted RSUs vested, converting into 2,246 and 1,933 American Depositary Shares (ADS). The company withheld 1,235 and 1,062 ADS at $15.42 per ADS to cover taxes, leaving Ketchum holding about 40,879 ADS directly.

On February 1, 2026, Ketchum received new awards under Amarin’s 2020 Stock Incentive Plan: 8,013 Restricted Stock Units and a stock option for 36,060 ADS with an exercise price of $14.99 per ADS, vesting over three years. Each ADS currently represents twenty Ordinary Shares following an earlier ADS ratio change, and each RSU corresponds to twenty Ordinary Shares or cash at the company’s discretion.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Ketchum Steven B

(Last) (First) (Middle)

C/O AMARIN PHARMA, INC.

440 US HIGHWAY 22

(Street)

BRIDGEWATER NJ 08807

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
01/31/2026

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
American Depositary Shares(1)	01/31/2026		M(2)		2,246(1)	A	(3)	41,243(1)	D
American Depositary Shares(1)	01/31/2026		F(4)		1,235(1)	D	$15.42	40,008(1)	D
American Depositary Shares(1)	01/31/2026		M(5)		1,933(1)	A	(3)	41,941(1)	D
American Depositary Shares(1)	01/31/2026		F(4)		1,062(1)	D	$15.42	40,879(1)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit(6)	$0	01/31/2026		M		2,246(1)		(2)	(3)	American Depositary Shares(1)	2,246(1)	$0.00	0(1)	D
Restricted Stock Unit(6)	$0	01/31/2026		M		1,933(1)		(5)	(3)	American Depositary Shares(1)	1,933(1)	$0.00	1,933(1)	D
Restricted Stock Unit(1)	$0	02/01/2026		A		8,013(1)		(7)	(3)	American Depositary Shares(1)	8,013(1)	$0.00	8,013(1)	D
Stock Option (right to buy)	$14.99	02/01/2026		A		36,060(1)		(8)	02/01/2036	American Depositary Shares(1)	36,060(1)	$0.00	36,060(1)	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 4 reflect the ADS Ratio Change.

2. On February 21, 2023, the Reporting Person was granted 6,740 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2020 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.

3. Not applicable.

4. 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.

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

7. On February 1, 2026, the Reporting Person was granted 8,013 RSUs under the Plan. These RSUs vest in three equal installments on each of January 31, 2027, January 31, 2028 and January 31, 2029.

8. On February 1, 2026, the Reporting Person was granted an option to purchase 36,060 ADSs 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 first day of each May, August, November and February.

	/s/ Jonathan Provoost, by power of attorney	02/03/2026
	** Signature of Reporting Person	Date
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FAQ

What did Amarin (AMRN) executive Steven B. Ketchum report in this Form 4?

Steven B. Ketchum reported RSU vestings, tax-related share withholdings, and new equity grants. Vested RSUs converted into ADS, some ADS were withheld for taxes, and he received new RSUs plus a multi-year stock option grant under Amarin’s 2020 Stock Incentive Plan.

How many Amarin (AMRN) ADS did Steven Ketchum hold after the January 31, 2026 transactions?

After the January 31, 2026 transactions, Steven Ketchum directly held about 40,879 American Depositary Shares. This figure reflects RSU conversions into ADS and shares withheld by Amarin to satisfy tax liabilities associated with the vesting, rather than open-market share sales.

What new equity awards did Steven Ketchum receive from Amarin (AMRN) on February 1, 2026?

On February 1, 2026, Steven Ketchum received 8,013 Restricted Stock Units and a stock option for 36,060 ADS. The option carries a strike price of $14.99 per ADS and vests over three years, with one-third vesting after one year and the rest quarterly thereafter.

How are Amarin (AMRN) RSUs structured for Steven Ketchum after the ADS ratio change?

Each RSU represents a contingent right to receive twenty Ordinary Shares or cash instead, at Amarin’s discretion. This reflects an ADS ratio change effective April 11, 2025, where one ADS now equals twenty Ordinary Shares, with proportional adjustments to outstanding equity awards.

Were Steven Ketchum’s Amarin (AMRN) tax withholdings market sales of shares?

No, the share reductions marked with transaction code “F” represent shares withheld by Amarin to cover tax liabilities. The filing specifies these are withholdings associated with RSU vesting under Rule 16b-3 and not market sales of ADS on an exchange or through open trading.