Amarin EVP Ketchum logs RSU vesting, tax ADS

AMARIN CORP PLC reported compensation-related equity activity for EVP and Chief Scientific Officer Steven B. Ketchum.

Rhea-AI Filing Summary

AMARIN CORP PLC reported compensation-related equity activity for EVP and Chief Scientific Officer Steven B. Ketchum. On July 1, 2026 he acquired 3,688 American Depositary Shares through a derivative exercise linked to restricted stock units, while 1,887 ADS were disposed as shares withheld to cover tax obligations. Following these events, he directly holds 42,680 ADS.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Ketchum Steven B

Role EVP, Chief Scientific Officer

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit F5, F1, F2, F3	3,688	$0.00	$0.00
Exercise	American Depositary Shares F1, F2, F3	3,688	--	--
Tax Withholding	American Depositary Shares F1, F4	1,887	$15.94	$30K

Holdings After Transaction: Restricted Stock Unit — 0 contracts (Direct); American Depositary Shares — 42,680 shares (Direct)

Footnotes (5)

1. 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.
2. F2. On January 10, 2025, the Reporting Person was granted 7,376 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2020 Stock Incentive Plan (the "Plan"). The shares subject to this grant shall vest over eighteen months, with 50% to vest on January 2, 2026 and the remaining balance to vest on July 1, 2026.
3. F3. Not applicable.
4. 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.
5. F5. Each RSU represents a contingent right to receive twenty Ordinary Shares or cash in lieu thereof at the Issuer's discretion.

Key Figures

ADS withheld for taxes: 1,887 American Depositary Shares ADS acquired via RSU-related exercise: 3,688 American Depositary Shares RSUs in underlying grant: 7,376 Restricted Stock Units +4 more

7 metrics

ADS withheld for taxes 1,887 American Depositary Shares Shares withheld to cover tax liability on July 1, 2026 vesting

ADS acquired via RSU-related exercise 3,688 American Depositary Shares Non-derivative acquisition on July 1, 2026 from derivative exercise/conversion

RSUs in underlying grant 7,376 Restricted Stock Units Grant on January 10, 2025 under the 2020 Stock Incentive Plan

Post-transaction ADS holdings 44,567 American Depositary Shares Directly owned by Steven B. Ketchum following July 1, 2026 transactions

Tax withholding price $15.94 per ADS Value used for 1,887 ADS withheld for tax obligations

ADS to Ordinary Share ratio 1 ADS = 20 Ordinary Shares ADS Ratio Change effective April 11, 2025

RSU Ordinary Share equivalent 20 Ordinary Shares per RSU Each RSU represents a contingent right to 20 Ordinary Shares or cash

Key Terms

American Depositary Shares, Restricted Stock Units, ADS Ratio Change, Rule 16b-3, +1 more

5 terms

American Depositary Shares financial

"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.

Restricted Stock Units financial

"the Reporting Person was granted 7,376 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2020 Stock Incentive Plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

ADS Ratio Change financial

"the Issuer implemented a ratio change that one (1) American Depositary Share ("ADS") currently represents twenty (20) Ordinary Shares ("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.

Rule 16b-3 regulatory

"vesting of a security issued in accordance with Rule 16b-3, and not a market sale of securities"

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.

2020 Stock Incentive Plan financial

"Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2020 Stock Incentive Plan (the "Plan")"

FAQ

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

What insider transactions did AMRN executive Steven B. Ketchum report on July 1, 2026?

Steven B. Ketchum reported compensation-related equity transactions, acquiring 3,688 American Depositary Shares from restricted stock unit activity, with 1,887 ADS withheld by the issuer to satisfy tax liabilities, rather than sold in the open market.

How many Amarin (AMRN) American Depositary Shares does Steven B. Ketchum hold after these Form 4 transactions?

After the reported transactions, Steven B. Ketchum directly holds 44,567 American Depositary Shares. This figure reflects the 3,688 ADS acquired through RSU-related activity and the 1,887 ADS withheld to cover tax obligations on the vesting.

How many AMRN shares were withheld for taxes in Steven B. Ketchum’s July 1, 2026 Form 4?

A total of 1,887 American Depositary Shares were withheld by Amarin to cover tax liabilities associated with the vesting of equity awards. The filing clarifies that this was not a market sale but issuer withholding under Rule 16b-3.

What restricted stock unit grant underlies Steven B. Ketchum’s AMRN Form 4 transactions?

Ketchum received a grant of 7,376 Restricted Stock Units on January 10, 2025 under Amarin’s 2020 Stock Incentive Plan. The RSUs vest over 18 months, 50% on January 2, 2026 and the remaining 50% on July 1, 2026.

What does the ADS ratio change disclosed by AMRN mean for Steven B. Ketchum’s equity awards?

Amarin implemented an ADS Ratio Change so that one American Depositary Share represents 20 Ordinary Shares. The company made proportionate adjustments to outstanding equity awards, and the amounts reported in this Form 4 already reflect that adjustment.

How do Steven B. Ketchum’s AMRN Restricted Stock Units relate to Ordinary Shares?

Each Restricted Stock Unit represents a contingent right to receive 20 Ordinary Shares or cash, at Amarin’s discretion. Thus, the 3,688 RSUs referenced in the filing correspond to rights over a larger number of underlying Ordinary Shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/15/2026 - 05:00 PM EDT Learn about SEC filing dates

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^*

Ketchum Steven B

(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)
	EVP, Chief Scientific Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

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)
			Code	V	Amount	(A) or (D)	Price
American Depositary Shares(1)	07/01/2026		M(2)		3,688(1)	A	(3)	44,567(1)	D
American Depositary Shares(1)	07/01/2026		F(4)		1,887(1)	D	$15.94	42,680(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	07/01/2026		A		3,688(1)		(2)	(3)	American Depositary Shares(1)	3,688(1)	$0.00	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 January 10, 2025, the Reporting Person was granted 7,376 Restricted Stock Units ("RSUs") under the Amarin Corporation plc 2020 Stock Incentive Plan (the "Plan"). The shares subject to this grant shall vest over eighteen months, with 50% to vest on January 2, 2026 and the remaining balance to vest on July 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	07/01/2026
	** 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)