Amarin director exercises RSUs, net 836 ADS holding

Diane E. Sullivan, a director of Amarin Corporation plc, exercised previously granted restricted stock units on April 18, 2026 to acquire 838 American Depositary Shares.

Rhea-AI Filing Summary

Diane E. Sullivan, a director of Amarin Corporation plc, exercised previously granted restricted stock units on April 18, 2026 to acquire 838 American Depositary Shares. In connection with vesting, 403 ADSs were withheld to satisfy tax obligations, not sold in the market. Following these transactions, she holds 836 ADSs directly.

Insider Trade Summary

838 shares exercised/converted

Exercise 3 txns

Insider Sullivan Diane E.

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	838	$0.00	$0.00
Exercise	American Depositary Shares	838	$0.00	$0.00
Exercise Price or Tax Liability	American Depositary Shares	403	$14.98	$6K

Holdings After Transaction: Restricted Stock Unit — 838 contracts (Direct); American Depositary Shares — 836 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 April 18, 2024, following the conclusion of the Issuer's annual general meeting of shareholders for 2024, the Reporting Person was granted 2,514 RSUs under the Amarin Corporation plc 2020 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of April 18, 2025, April 18, 2026 and April 18, 2027.
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

RSUs exercised: 838.0000 RSUs ADSs withheld for taxes: 403.0000 ADSs Tax withholding price: $14.9800 per ADS +3 more

6 metrics

RSUs exercised 838.0000 RSUs Restricted Stock Units converted into ADSs on April 18, 2026

ADSs withheld for taxes 403.0000 ADSs Shares withheld to satisfy tax liability at vesting

Tax withholding price $14.9800 per ADS Per-share value for the 403 ADS tax-withholding disposition

Post-transaction ADS holding 836 ADSs Direct holdings of American Depositary Shares after the reported transactions

RSUs granted under Plan 2,514 RSUs RSUs granted April 18, 2024, vesting over three annual installments

ADS ratio 1 ADS = 20 Ordinary Shares ADS ratio change effective April 11, 2025

Key Terms

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

5 terms

Restricted Stock Unit financial

"was granted 2,514 RSUs under the Amarin Corporation plc 2020 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

"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.

ADS Ratio Change financial

"the Issuer implemented a ratio change that one (1) American Depositary Share"

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

"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.

Amarin Corporation plc 2020 Stock Incentive Plan financial

"granted 2,514 RSUs under the Amarin Corporation plc 2020 Stock Incentive Plan"

FAQ

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

What transactions did Diane E. Sullivan report in Amarin (AMRN)'s Form 4?

She exercised 838 restricted stock units into American Depositary Shares and had 403 ADSs withheld for taxes. These April 18, 2026 transactions relate to equity awards under Amarin's 2020 Stock Incentive Plan and resulted in 836 ADSs held directly.

How many Amarin (AMRN) ADSs did Diane E. Sullivan acquire and at what prices?

She acquired 838 ADSs through RSU vesting at a conversion price of $0.00 per share. Separately, 403 ADSs were withheld to cover taxes, valued at $14.98 per ADS in the tax-withholding disposition.

What is Diane E. Sullivan's Amarin (AMRN) shareholding after these Form 4 transactions?

After the reported transactions, Diane E. Sullivan holds 836 American Depositary Shares of Amarin directly. This post-transaction balance reflects the RSU exercise, the ADS ratio change, and the shares withheld to satisfy tax liabilities at vesting.

How were the reported RSUs for Amarin (AMRN) originally granted and when do they vest?

On April 18, 2024, she was granted 2,514 RSUs under the Amarin Corporation plc 2020 Stock Incentive Plan. These RSUs vest in three equal installments on April 18, 2025, 2026 and 2027, with the 2026 tranche tied to this Form 4.

What does the ADS ratio change mean for Amarin (AMRN) equity awards?

Effective April 11, 2025, one ADS represents twenty Ordinary Shares. Amarin made proportionate adjustments to outstanding equity awards, and the amount of securities reported in this Form 4 reflects that ADS ratio change for Diane E. Sullivan’s RSUs and ADSs.

Were Diane E. Sullivan's Amarin (AMRN) Form 4 transactions market sales?

No. The Form 4 specifies that 403 ADSs represent shares withheld by Amarin to cover tax liability on vesting under Rule 16b-3, and not a market sale. The RSU conversion itself is an equity award exercise, not an open-market trade.

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

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Accepted by SEC EDGAR 04/21/2026 - 05:00 PM 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^*

Sullivan Diane E.

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/18/2026

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)	04/18/2026		M(2)		838(1)	A	(3)	1,239(1)	D
American Depositary Shares(1)	04/18/2026		F(4)		403(1)	D	$14.98	836(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	04/18/2026		M		838(1)		(2)	(3)	American Depositary Shares(1)	838(1)	$0	838(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 18, 2024, following the conclusion of the Issuer's annual general meeting of shareholders for 2024, the Reporting Person was granted 2,514 RSUs under the Amarin Corporation plc 2020 Stock Incentive Plan (the "Plan"). These RSUs vest in three equal installments on each of April 18, 2025, April 18, 2026 and April 18, 2027.

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	04/21/2026
	** 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)