dMY Squared Technology Group, Inc.: 5%+ holders

As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of dMY Squared Technology Group, Inc. The largest reported stake is dMY Squared Sponsor, LLC's, at 29.7%. 11 filings are on record since July 31, 2025 (Schedule 13G/A, September 17, 2025).

Alberta Investment Management Corp also filed stake reports on 2 other companies ↓

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Key facts

• Filed 2026-05-19 · Holder: National Philanthropic Trust · Percent: 0% · SCHEDULE 13D/A
• Filed 2026-05-15 · Holder: Merus Global Investments, LLC · Percent: 0% · SCHEDULE 13G/A
• Filed 2026-02-17 · Holder: J. Goldman & Co LP · Percent: 0% · SCHEDULE 13G/A
• Filed 2025-11-14 · Holder: J. Goldman & Co LP · Percent: 6.4% · SCHEDULE 13G/A
• Filed 2025-10-03 · Holder: Shay Capital LLC · Percent: 5.4% · SCHEDULE 13G

dMY Squared Technology Group, Inc. has 11 Schedule 13D or 13G filings on record since 2025-07-31. 2 holders' latest filing reports 5% or more of class a common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on dMY Squared Technology Group, Inc. and the records around it.

Companies that share a holder

• Alberta Investment Management Corp also filed stake reports on 2 other companies: Fortress Value Acquisition Corp. V (Mar 2026)
• Shay Capital LLC also filed stake reports on 7 other companies: Xponential Fitness, Inc. (Jun 2026), DUOS TECHNOLOGIES GROUP, INC. (May 2026), A2Z CUST2MATE SOLUTIONS CORP. (Apr 2026)
• Merus Global Investments, LLC also filed stake reports on 10 other companies: General Fusion Group Ltd. (Aug 2026), D. Boral ARC Acquisition I Corp. (Jun 2026), Bleichroeder Acquisition Corp. II (Jun 2026)

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Purpose of Transaction (Item 4)

National Philanthropic Trust

On March 19, 2026, Horizon Quantum Holdings Ltd., a Singapore public company limited by shares ("Horizon"), consummated the Transaction with dMY Squared Technology Group, Inc., a Massachusetts corporation (the "Issuer") and various other parties. As part of the Transaction, each outstanding share of Class A Common Stock of the Issuer (excluding any such shares which were redeemed as part of the Transaction) were automatically converted into the right to receive one Class A Share of Horizon (the "Horizon Class A Shares"). The Horizon Class A Shares were registered with the SEC on Form 8-A, effective March 19, 2025. Immediately following the Transaction, (i) there were 31,833,549 Horizon Class A Shares and 19,744,585 Horizon Class B Shares of Horizon issued and outstanding and (ii) the Reporting Person's entire holdings in Horizon securities consisted of 231,520 Horizon Class A Shares which shares it continues to hold as of the time of this Schedule 13D Amendment filing. The Reporting Person holds less than 5% of the Horizon Class A Shares and is not a Schedule 13D filer with regard to its holdings of Horizon Class A Shares.Item 4 of the SCHEDULE 13D/A filed 2026-05-19

Timeline

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Questions about who owns dMY Squared Technology Group, Inc.

Who owns dMY Squared Technology Group, Inc.?

On this page, 2 holders' latest ownership filings report 5% or more of dMY Squared Technology Group, Inc.: dMY Squared Sponsor, LLC (29.7%, Schedule 13G/A, filed 2025-09-17) and Shay Capital LLC (5.4%, Schedule 13G, filed 2025-10-03).

Who are the largest shareholders of dMY Squared Technology Group, Inc.?

By the share each holder's latest filing reports, the largest holders of dMY Squared Technology Group, Inc. on this page are dMY Squared Sponsor, LLC (29.7%) and Shay Capital LLC (5.4%).

When did dMY Squared Sponsor, LLC buy into dMY Squared Technology Group, Inc.?

The filings give report dates, not purchase dates. The earliest filing from dMY Squared Sponsor, LLC on this page is the Schedule 13G/A, filed 2025-09-17, reporting 29.7%. That earliest filing is itself an amendment, which updates an earlier report.

Is this an audit or a full list?

Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 11 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.

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Where this comes from

Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.

Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.

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