[Form 4] Amarin Corp Plc Insider Trading Activity

Rhea-AI Filing Summary

This Form 4 reports routine equity activity by Amarin Corp. (AMRN) SVP & CFO Peter L. Fishman on 1 Aug 2025 following the 1-for-20 ADS ratio adjustment implemented 11 Apr 2025. Fishman acquired 312 American Depositary Shares (ADS) upon the partial vesting of 2022-granted RSUs (transaction code M). To cover withholding taxes, the company retained 160 ADS at an imputed price of $14.52 (code F). After the net settlement, Fishman’s direct holding stands at 3,988 ADS (≈79,760 ordinary shares).

The RSU grant originally comprised 1,250 units vesting in four equal tranches from 2023-2026; the 2025 installment is reflected here. No open-market buying or selling occurred, and no derivative positions were closed or written. The filing signals continued insider ownership but is operationally neutral with no implications for Amarin’s fundamentals or guidance.

Insights

Equity Compensation Analyst

TL;DR: Routine RSU vesting; CFO nets +152 ADS, retains 3,988—no market signal.

The filing shows standard annual vesting under the 2011 Stock Incentive Plan. The CFO took delivery of 312 ADS and surrendered 160 ADS for taxes at a fair-market value of $14.52, leaving a modest net increase in ownership. No discretionary sale occurred, so the transaction does not reflect a view on valuation. With total holdings under $60 k, material impact on float or sentiment is negligible. I classify the disclosure as not impactful and neutral for investors.

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^*

Fishman Peter L.

(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)
	SVP, CFO

3. Date of Earliest Transaction (Month/Day/Year)
08/01/2025

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 Share(1)	08/01/2025		M(2)		312(1)	A	(3)	4,148(1)	D
American Depositary Share(1)	08/01/2025		F(4)		160(1)	D	$14.52	3,988(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(5)	$0.00	08/01/2025		A		312(1)		(2)	(3)	American Depositary Shares(1)	312(1)	$0.00	313(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 August 8, 2022, the Reporting Person was granted 1,250 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in four equal installments on each of August 1, 2023, August 1, 2024, August 1, 2025, and August 1, 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. Each RSU represents a contingent right to receive twenty Ordinary Shares or cash in lieu thereof at the Issuer's discretion.

	/s/ Jonathan Provoost, by power of attorney	08/04/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

How many AMRN ADS does CFO Peter Fishman own after the 1 August 2025 transaction?

He directly owns 3,988 American Depositary Shares after net settlement.

What type of insider transaction was disclosed in the AMRN Form 4?

It reflects RSU vesting (code M) and withholding for taxes (code F); no open-market sale or purchase.

At what price were ADS withheld for taxes in the AMRN Form 4 filing?

Shares were withheld at an imputed value of $14.52 per ADS.

Why did the share counts change after Amarin’s ADS ratio adjustment?

On 11 Apr 2025, Amarin changed its ADS ratio to 1 ADS = 20 ordinary shares; all equity awards, including RSUs, were proportionally adjusted.

Does the Form 4 signal any change in Amarin’s financial outlook?

No. The filing is a routine equity compensation event and does not affect guidance or fundamentals.