Sarissa Capital Management LP and Alexander J. Denner report beneficial ownership of 25,743,900 Amarin ordinary shares, equal to 6.09% of the class. The activist 13D designation matters because it identifies the position as activist rather than passive, while recent sales in Amarin securities provide transaction detail for investors tracking the stake.

Key Highlights

  • Amarin’s ownership percentage is calculated against 422,456,685 outstanding ordinary shares.
  • The reported position includes 20,632,560 ordinary shares held as American Depositary Shares.
  • Sarissa’s transaction schedule records Amarin ADS sales on 08/24/2026 at prices including 14.01000, 14.03000 and 14.06000.

The Reported Amarin (NASDAQ: AMRN) Position

Sarissa Capital Management LP and Denner are deemed to beneficially own the shares in aggregate. The ordinary shares carry a Par Value of 50 pence per share. The ownership percentage is based on 422,456,685 ordinary shares outstanding as of July 24, 2026. The reported holding includes 20,632,560 ordinary shares held as American Depositary Shares. Sarissa’s principal Business office is listed at 500 West Putnam Avenue, Suite 400, Greenwich, Connecticut 06830. The position is classified as activist.

Recent Amarin Securities Transactions

The transaction schedule covers activity during the past 60 days and records sales of Amarin (NASDAQ: AMRN) American Depositary Shares on 08/24/2026. Listed prices include 14.01000, 14.02000, 14.03000, 14.06000, 14.06100 and 14.08000. The schedule includes individual sale amounts of 336, 42, 100, 110, 400, 140, 661, 271, 390, 46, 59 and 79. Other listed transactions include sales of 4,600, 1,865, 1,000 and 11,000 ADSs at a price of 14.00000. Additional entries show sales of 200, 300, 108, 102, 89, 78, 76, 73, 70, 59, 46, 42, 25, 22, 15, 8, 4 and 2 ADSs at the listed price levels. The transaction schedule was added to the ownership materials associated with Sarissa and Denner.

Updated Ownership Details

The amendment updates the principal business address for the reporting persons and revises the reported beneficial ownership information. It also adds the recent securities transactions to the ownership record. Alexander J. Denner signed in his capacity as chief Investment officer of Sarissa Capital Management LP and separately as Alexander J. Denner. The signatures are dated 08/27/2026.

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