Amarin (AMRN) COO awarded new RSUs and options after January vesting

Rhea-AI Filing Summary

Amarin Corporation’s EVP and Chief Operating Officer David Paul Keenan reported routine equity compensation activity and tax withholding around RSU vesting. On January 31, 2026, previously granted restricted stock units converted into American Depositary Shares (ADSs), with 2,246 ADSs and 1,933 ADSs delivered and portions of each vest used to cover taxes through share withholding at $15.42 per ADS.

On February 1, 2026, Keenan received a new grant of 8,013 restricted stock units and 30,060 stock options under Amarin’s 2020 Stock Incentive Plan, with the RSUs and options scheduled to vest over three years. Each RSU represents a contingent right to receive twenty ordinary shares or cash, reflecting a prior change so that 1 ADS equals 20 ordinary shares.

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^*

Keenan David Paul

(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 Operating 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)	11,958(1)	D
American Depositary Shares(1)	01/31/2026		F(4)		1,173(1)	D	$15.42	10,785(1)	D
American Depositary Shares(1)	01/31/2026		M(5)		1,933(1)	A	(3)	12,718(1)	D
American Depositary Shares(1)	01/31/2026		F(4)		1,010(1)	D	$15.42	11,708(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(6)	$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		30,060(1)		(8)	02/01/2036	American Depositary Shares(1)	30,060(1)	$0.00	30,060(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 equity awards did Amarin (AMRN) COO David Paul Keenan receive?

David Paul Keenan received 8,013 restricted stock units and 30,060 stock options on February 1, 2026 under Amarin’s 2020 Stock Incentive Plan. These awards vest over three years, tying a portion of his compensation to Amarin’s share performance over time.

How do the new Amarin (AMRN) RSUs and options for the COO vest?

The 8,013 RSUs granted February 1, 2026 vest in three equal installments on January 31, 2027, 2028, and 2029. The 30,060 stock options vest over three years, with 33% after one year and the remainder quarterly over the next eight quarters.

What happened with David Paul Keenan’s existing Amarin (AMRN) RSUs on January 31, 2026?

Previously granted RSUs vested on January 31, 2026, converting into 2,246 ADSs and 1,933 ADSs. From each vest, Amarin withheld 1,173 ADSs and 1,010 ADSs at $15.42 per ADS to satisfy tax obligations, rather than selling shares in the market.

How many Amarin (AMRN) ADSs did the COO hold after the reported transactions?

After the January 31, 2026 vesting and tax withholding events, David Paul Keenan beneficially owned 11,708 American Depositary Shares directly. This figure reflects the net shares remaining after RSU conversions and the issuer’s share withholding for taxes.

What does the Amarin (AMRN) ADS ratio change mean for these grants?

Effective April 11, 2025, one American Depositary Share equals twenty ordinary shares. All RSU and option amounts in this filing already reflect that adjustment. Each RSU now represents a right to receive twenty ordinary shares or cash, at Amarin’s discretion.

Were any of the Amarin (AMRN) COO’s reported share movements open-market sales?

No open-market sales are reported. Transactions coded “F” represent issuer share withholding to cover tax liabilities from RSU vesting at $15.42 per ADS, not discretionary market sales. The other transactions reflect RSU settlements and new equity grants.