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
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| dMY Squared Sponsor, LLC | 29.7% | 1,163,484 | SCHEDULE 13G/A, 2025-09-17 | 2025-09-15 |
| Shay Capital LLC | 5.4% | 125,359 | SCHEDULE 13G, 2025-10-03 | 2025-09-26 |
| Meteora Capital, LLC | 3.87% | 90,607 | SCHEDULE 13G/A, 2025-08-11 | 2025-06-30 |
| Bank of Montreal | 1.3% | 30,307 | SCHEDULE 13G/A, 2025-07-31 | 2025-07-01 |
| Alberta Investment Management Corp | 0% | 0 | SCHEDULE 13G/A, 2025-07-31 | 2025-06-30 |
| J. Goldman & Co LP | 0% | 0 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| National Philanthropic Trust | 0% | 0 | SCHEDULE 13D/A, 2026-05-19 | 2026-03-19 |
| Merus Global Investments, LLC | 0% | 0 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
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
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-31 | Bank of Montreal | 1.3% | SCHEDULE 13G/A |
| 2025-07-31 | Alberta Investment Management Corp | 0% | SCHEDULE 13G/A |
| 2025-08-11 | Meteora Capital, LLC | 3.87% | SCHEDULE 13G/A |
| 2025-08-14 | J. Goldman & Co LP | 9.6% | SCHEDULE 13G/A |
| 2025-09-17 | dMY Squared Sponsor, LLC | 29.7% | SCHEDULE 13G/A |
| 2025-09-19 | National Philanthropic Trust | 9% | SCHEDULE 13D |
| 2025-10-03 | Shay Capital LLC | 5.4% | SCHEDULE 13G |
| 2025-11-14 | J. Goldman & Co LP | 6.4% | SCHEDULE 13G/A |
| 2026-02-17 | J. Goldman & Co LP | 0% | SCHEDULE 13G/A |
| 2026-05-15 | Merus Global Investments, LLC | 0% | SCHEDULE 13G/A |
| 2026-05-19 | National Philanthropic Trust | 0% | SCHEDULE 13D/A |
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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.