In his last 13D filed back in 2023, he reports a controlling interest in 33.4M shares. There hasn't been a more recent 13D reporting a change of more than 1%, so he still has control of 33.4M shares +/- 4 million shares.
In the 13F list on the link, you can see what Sarissa holds in their main LP, Sarissa Capital ~24M as of last reporting. There has to be ~9M shares in some other company or advisory account he controls. You can see how Denner moved 19M shares December 2022 out of his LP. This is when he loaded up his various sub accounts before the proxy. A financial "sale" on his books cause he moved them thru his prime broker. Remember everyone here was hopping up and down when MS or whichever one it was, I forget, reported a pickup of 19M shares on their 13F thinking they were investing in Amarin. No... it was just Denner shuffling shares. The 19M sale to himself cut his cost basis as he booked a loss given the share price at the time, and he most likely used it to offset gains for the year. Ultimately, he kept control of the shares which is why he didn't report a disposition of shares on a 13D at that time and told everyone "we've never sold a share". This is why his initial buy price is irrelevant and likely no longer his actual basis on his shares. He's been using and moving those shares. Every year is a new year for him and his crew, not like your IRA. Amarin's been a nice tax mule for him for 2+ years.
In 2024, he moved a majority from his sub accounts back into to his LP. Probably why you see MS showing a few million shares of Amarin every now and then. Same program just in reverse. But still should have around 33M shares under his thumb or he's violating SEC 13D filing regs and he's got a history of not caring about SEC rules.
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