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ProMIS Neurosciences

PMN on Nasdaq. Market value $84m.

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Should I look at this?

We have not checked this company yet

This is not advice.

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Who owns it

None of the long-term investors we follow own it. 27 funds in all.

Dec '25
Jun '26
Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

11 investors own more than 5%.

  • Fan Yu
    Passive investor
    at least 17.0%+5.7 pts
    (filed with 7 related holders)
    Since 3 February 2026
    What they said

    Item 4 is amended and supplemented by the following: CLOSING OF OFFERING On February 3, 2026, the previously disclosed Offering closed. REGISTRATION RIGHTS AGREEMENT On February 3, 2026, in connection with the closing of the Offering, the Issuer entered into a registration…

    Read the filing
  • Jeremy M. Sclar
    Passive investor
    at least 16.9%
    (filed with 2 related holders)
    Since 30 September 2025
  • 14.4%
    Since 31 March 2026
  • Ally Bridge Group (NY) LLC
    Passive investor
    at least 11.8%
    (filed with 2 related holders)
    Since 29 July 2025
  • Shaf QIC LLC
    Passive investor
    at least 10.0%
    (filed with 1 related holder)
    Since 29 July 2025
  • Deep Track Capital, LP
    Passive investor
    at least 10.0%
    (filed with 3 related holders)
    Since 30 January 2026
  • at least 9.9%
    (filed with 2 related holders)
    Since 3 February 2026
  • Wellington Biomedical Innovation Master Investors (Cayman) II, L.P.
    Passive investor
    7.8%−2.2 pts
    Since 30 June 2026
  • at least 7.8%−2.2 pts
    (filed with 3 related holders)
    Since 30 June 2026
  • at least 7.8%+2.3 pts
    (filed with 2 related holders)
    Since 31 December 2025
  • at least 7.7%−2.3 pts
    (filed with 2 related holders)
    Since 30 June 2026
  • Michael S. Gordon
    Passive investor
    Sold down below 5%
    Since 31 March 2026
  • Armistice Capital, LLC
    Passive investor
    Sold down below 5%
    Since 31 December 2025

From Schedule 13D and 13G filings: anyone owning more than 5% must file one.

What insiders did

In the last 12 months, 4 insiders bought $9m of shares on the open market.

  • Kaplan Johanne
    Chief Development Officer
    Bought
    Date
    5 August 2026
    Shares
    2,280
    Price
    $13.30
    Value
    $30,324
  • Kirwin Patrick D.
    Director
    Bought
    Date
    22 April 2026
    Shares
    4,000
    Price
    $11.33
    Value
    $45,320
  • Williams Eugene
    Director
    Bought
    Date
    5 March 2026
    Shares
    2,000
    Price
    $24.40
    Value
    $48,800
  • Williams Eugene
    Director
    Bought
    Date
    4 March 2026
    Shares
    2,000
    Price
    $24.00
    Value
    $48,000
  • Williams Eugene
    Director
    Bought
    Date
    3 March 2026
    Shares
    1,000
    Price
    $21.89
    Value
    $21,890
  • Williams Eugene
    Director
    Bought
    Date
    2 March 2026
    Shares
    1,000
    Price
    $22.53
    Value
    $22,530
  • Kaplan Johanne
    Chief Development Officer
    Bought
    Date
    19 February 2026
    Shares
    1,629
    Price
    $15.35
    Value
    $25,005
  • Alex Slanix Paul
    Director
    Bought
    Date
    3 February 2026
    Shares
    700,741
    Price
    $12.13
    Value
    $8m

From Form 4 filings: insiders must report trades in their own company's shares within two days.

Warning signs in its filings

Problems the company itself reported to the SEC, in its own words.

None of the warning signs we check for were found.

We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.

We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 25 Mar 2026, plus the 10-Q filed 13 Aug 2026 and 4 later 8-Ks.

A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.

The deep dive

Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.

  • What the business is worth, as a range, and the margin of safety at today’s price
  • Prices to start buying, buy, and buy hard
  • The three things that would make this a mistake
  • Every number footnoted to the filing it came from
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What a finished deep dive looks like

Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.