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  4. [SCHEDULE 13D/A] AMARIN CORP PLC\UK Amended Major Shareholder Report

Amarin (NASDAQ: AMRN) sees Sarissa report 25.7M+ shares

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
SCHEDULE 13D/A

Rhea-AI Filing Summary

AMARIN CORP PLC/UK (AMRN) received Amendment No. 16 to a Schedule 13D from Sarissa Capital Management LP and Alexander J. Denner updating their ownership disclosure. The reporting persons may be deemed to beneficially own 25,743,900 Ordinary Shares, representing approximately 6.09% of Amarin’s outstanding Ordinary Shares.

The percentage is calculated based on 422,456,685 Ordinary Shares outstanding as of July 24, 2026, which includes 20,632,560 Ordinary Shares held as ADSs, each ADS representing 20 Ordinary Shares, as reported in Amarin’s Form 10-Q for the quarter ended June 30, 2026. All voting and dispositive power reported is shared rather than sole. The amendment also notes that transactions in the issuer’s securities within the past 60 days are listed in a new Exhibit 17.

Positive

  • None.

Negative

  • None.
Beneficial ownership 25,743,900 Ordinary Shares Aggregate Ordinary Shares that the reporting persons may be deemed to beneficially own
Percent of class 6.09% Portion of Amarin’s outstanding Ordinary Shares represented by the reporting persons’ holdings
Shares outstanding 422,456,685 Ordinary Shares Ordinary Shares outstanding as of July 24, 2026, per Amarin’s Form 10-Q
Ordinary Shares held as ADSs 20,632,560 Ordinary Shares Ordinary Shares included in ADSs, each ADS representing 20 Ordinary Shares
Shared voting power 25,743,900 Ordinary Shares Ordinary Shares over which the reporting persons have shared voting power
Shared dispositive power 25,743,900 Ordinary Shares Ordinary Shares over which the reporting persons have shared dispositive power
Schedule 13D regulatory
"This Amendment No. 16 to ("Amendment No. 16") relates to American Depositary Shares"
A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.
American Depositary Shares financial
"relates to American Depositary Shares ("ADS(s)"), each ADS presently representing"
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.
Ordinary Shares financial
"ADS(s), each ADS presently representing twenty ordinary shares, par value 50 pence per share (the "Ordinary Shares")"
Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.
beneficially own financial
"The Reporting Persons may be deemed to beneficially own, in the aggregate, 25,743,900 Ordinary Shares"
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
dispositive power financial
"Shared Dispositive Power 25,743,900.00"
Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

FAQ

How many AMRN shares does Sarissa Capital currently report owning?
Sarissa Capital Management LP and Alexander J. Denner report that they may be deemed to beneficially own 25,743,900 Ordinary Shares of Amarin. This figure includes Ordinary Shares underlying American Depositary Shares and reflects their aggregate beneficial ownership position.

What percentage of AMRN does Sarissa Capital’s stake represent?
Sarissa Capital and Alexander J. Denner report beneficial ownership of 6.09% of Amarin’s outstanding Ordinary Shares. This percentage is based on 422,456,685 Ordinary Shares outstanding as of July 24, 2026, as disclosed in Amarin’s Form 10-Q.

How many AMRN shares were outstanding when Sarissa’s 6.09% was calculated?
The reported 6.09% beneficial ownership is calculated using 422,456,685 Ordinary Shares outstanding as of July 24, 2026. This total includes 20,632,560 Ordinary Shares held as ADSs, each ADS representing 20 Ordinary Shares, as disclosed in Amarin’s Form 10-Q.

Does Sarissa Capital have sole or shared voting power over its AMRN stake?
The reporting persons state they have 0 Ordinary Shares with sole voting power and 25,743,900 Ordinary Shares with shared voting power. They similarly report shared dispositive power over 25,743,900 Ordinary Shares and no sole dispositive power.

What new information is added in Amendment No. 16 to Sarissa’s AMRN Schedule 13D?
Amendment No. 16 updates Item 2(b) (address information), Item 5(a) (beneficial ownership and percentage), Item 5(c) (recent transactions by reference to Exhibit 17), and Item 7 to add Exhibit 17 – Transactions in Securities.

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

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023111206
(CUSIP Number)
Alexander J Denner
Sarissa Capital Management LP, 500 West Putnam Avenue, Suite 400
Greenwich, CT, 06830
203-302-2330
(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
08/25/2026
(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


schemaVersion:


SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D


Sarissa Capital Management LP
Signature:/s/ Alexander J Denner
Name/Title:Alexander J Denner/Chief Investment Officer
Date:08/27/2026
Alexander J Denner
Signature:/s/ Alexander J Denner
Name/Title:Alexander J Denner
Date:08/27/2026

Source: View Original Filing on SEC EDGAR