Amarin CFO exercises 125 RSUs, shares withheld for tax

Amarin Corporation CFO Peter L. Fishman reported routine equity compensation activity involving Restricted Stock Units (RSUs) and American Depositary Shares (ADSs).

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Form Type

Rhea-AI Filing Summary

Amarin Corporation CFO Peter L. Fishman reported routine equity compensation activity involving Restricted Stock Units (RSUs) and American Depositary Shares (ADSs). On April 1, 2026, 125 RSUs previously granted under the company’s stock plan were exercised into 125 ADSs at an exercise price of $0.00 per share.

Of these ADSs, 62 shares were withheld by Amarin at $14.46 per share to cover tax liabilities related to the vesting, as permitted under Rule 16b-3 and described as not being a market sale. Following these transactions, Fishman holds 6,220 ADSs directly, reflecting a small, compensation-driven adjustment to his position.

Insider Trade Summary

125 shares exercised/converted

Exercise 3 txns

Insider Fishman Peter L.

Role SVP, CFO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	125	$0.00	$0.00
Exercise	American Depositary Shares	125	$0.00	$0.00
Exercise Price or Tax Liability	American Depositary Shares	62	$14.46	$896.52

Holdings After Transaction: Restricted Stock Unit — 0 contracts (Direct); American Depositary Shares — 6,220 shares (Direct)

Footnotes (5)

F1. 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.
F2. On April 1, 2023, the Reporting Person was granted 375 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of April 1, 2024, April 1, 2025, and April 1, 2026.
F3. Not applicable.
F4. 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.
F5. Each RSU represents a contingent right to receive twenty Ordinary Shares or cash in lieu thereof at the Issuer's discretion.

Key Figures

RSUs exercised: 125 units ADSs acquired from RSUs: 125 shares Shares withheld for taxes: 62 ADS +3 more

6 metrics

RSUs exercised 125 units RSUs converted into ADSs on April 1, 2026

ADSs acquired from RSUs 125 shares Issued at $0.00 per share upon RSU vesting

Shares withheld for taxes 62 ADS Withheld at $14.46 per share for tax liability

Holdings after transactions 6,220 ADS Direct holdings of CFO Peter L. Fishman

Original RSU grant 375 RSUs Granted April 1, 2023 under 2011 Stock Incentive Plan

ADS to ordinary share ratio 1 ADS : 20 ordinary shares Effective after April 11, 2025 ADS ratio change

Key Terms

Restricted Stock Unit, American Depositary Shares, Rule 16b-3, tax liability, +1 more

5 terms

Restricted Stock Unit financial

"On April 1, 2023, the Reporting Person was granted 375 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

American Depositary Shares financial

"Effective April 11, 2025, the Issuer implemented a ratio change that one (1) American Depositary Share ("ADS") currently represents twenty (20) Ordinary Shares"

American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

Rule 16b-3 regulatory

"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"

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

tax liability financial

"Represents withholding by the Issuer of shares in respect of tax liability incident to the vesting of a security"

ADS Ratio Change financial

"The amount of securities reported on this Form 4 reflect the ADS Ratio Change"

An ads ratio change is an adjustment to how many American Depositary Shares (ADS) represent one unit of a foreign company’s ordinary shares — like changing whether a cake is cut into 2 or 10 slices. Investors care because it alters the number of tradable ADS, the implied price per ADS and an investor’s ownership stake, which can affect liquidity, perceived value and comparisons of holdings across markets.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Amarin (AMRN) CFO Peter L. Fishman report in this Form 4?

He reported routine equity compensation activity. 125 Restricted Stock Units vested into 125 American Depositary Shares, with part of the shares withheld to satisfy tax obligations, and his direct holdings updated accordingly.

How many Amarin (AMRN) shares did the CFO acquire through RSU vesting?

He acquired 125 American Depositary Shares from the vesting of 125 Restricted Stock Units. These RSUs were granted under Amarin’s 2011 Stock Incentive Plan and vested according to a scheduled three-year installment structure.

How many Amarin (AMRN) shares were withheld for taxes in this transaction?

62 American Depositary Shares were withheld to cover tax liabilities tied to the RSU vesting. The withholding price was $14.46 per share and is specifically described as not representing a market sale of securities.

What are the Amarin (AMRN) CFO’s direct holdings after these Form 4 transactions?

After the reported transactions, Peter L. Fishman directly holds 6,220 American Depositary Shares. This figure reflects the impact of the RSU vesting, the share issuance, and the tax-related withholding on April 1, 2026.

Were the Amarin (AMRN) CFO’s transactions open-market buys or sales?

No open-market trades were reported. The filing shows an RSU exercise at $0.00 per share and a share withholding for taxes under Rule 16b-3, which the footnotes state is not a market sale of securities.

How were the Amarin (AMRN) RSUs originally structured for the CFO?

On April 1, 2023, he received 375 Restricted Stock Units, vesting in three equal installments on April 1 of 2024, 2025, and 2026. Each RSU represents a contingent right to receive twenty ordinary shares or cash at Amarin’s discretion.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 04/02/2026 - 04:30 PM

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

NEW JERSEY

08807

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
American Depositary Shares⁽¹⁾	04/01/2026		M⁽²⁾		125⁽¹⁾	A	⁽³⁾	6,282⁽¹⁾	D
American Depositary Shares⁽¹⁾	04/01/2026		F⁽⁴⁾		62⁽¹⁾	D	$14.46	6,220⁽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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Unit⁽⁵⁾	$0	04/01/2026		M		125⁽¹⁾		⁽²⁾	⁽³⁾	American Depositary Shares⁽¹⁾	125⁽¹⁾	$0	0⁽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 April 1, 2023, the Reporting Person was granted 375 RSUs under the Amarin Corporation plc 2011 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of April 1, 2024, April 1, 2025, and April 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	04/02/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR