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Horizon Quantum Holdings

HQ on Nasdaq. Market value $852m.

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Who owns it

None of the long-term investors we follow own it. 34 funds in all.

Jun '26
Largest holders overall

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

Big holders and activists

5 investors own more than 5%.

  • Joseph Francis Fitzsimons
    Insider or founder
    38.3%
    Since 19 March 2026
    What they said

    As previously disclosed on the Issuer's Form 20-F filed with the Securities and Exchange Commission on filed on March 25, 2026,, on September 9, 2025, the Issuer entered into a Business Combination Agreement (the "Business Combination Agreement") with Horizon Quantum Computing…

    Read the filing
  • Peak XV Partners Seed Investment
    Passive investor
    at least 20.3%
    (filed with 3 related holders)
    Since 19 March 2026
    What they said

    Peak Investments Seed purchased the aforementioned securities for investment purposes with the aim of increasing the value of its investments and the Issuer. Subject to applicable legal requirements, one or more of the Reporting Persons may purchase additional securities of the…

    Read the filing
  • IonQ, Inc.
    13.3%
    Since 19 March 2026
    What they said

    The information set forth in Item 3 and Item 6 is incorporated by reference in its entirety into this Item 4. The Reporting Person acquired the reported securities for investment purposes. Subject to the terms of, including the rights and obligations contained in, the…

    Read the filing
  • Harry L. You
    at least 11.8%
    (filed with 1 related holder)
    Since 19 March 2026
    What they said

    As previously disclosed, on September 9, 2025, the Issuer entered into a Business Combination Agreement (the "Business Combination Agreement") with Horizon Quantum Computing Pte. Ltd. ("Horizon"), dMY Squared Technology Group, Inc. ("DMY"), Rose Acquisition Pte. Ltd. ("Merger…

    Read the filing
  • Tencent Holdings Ltd
    Passive investor
    at least 11.1%−2.0 pts
    (filed with 1 related holder)
    Since 30 June 2026
  • ICS Opportunities, Ltd.
    Passive investor
    Sold down below 5%
    Since 17 June 2026

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

What insiders did

In the last 12 months, 1 insider bought $999,996 of shares on the open market.

  • Lambert Danielle
    Director
    Bought
    Date
    19 March 2026
    Shares
    84,602
    Price
    $11.82
    Value
    $999,996

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.

Horizon Quantum Holdings doesn’t file a US annual report (10-K), so we haven’t checked it.

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.