Horizon Quantum Holdings Ltd.: 5%+ holders

Horizon Quantum Holdings Ltd. has 7 Schedule 13D or 13G filings on record since 2026-03-20. 5 holders' latest filing reports 5% or more of class a ordinary shares. Each figure below is the holder's own, as filed, with the filing linked.

Holders

Purpose of Transaction (Item 4)

Harry L. You

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 Sub 1"), and Horizon Merger Sub 2, Inc. ("Merger Sub 2"), pursuant to which, subject to the satisfaction or waiver of certain conditions set forth therein, the following occurred: (1) the Issuer converted from a Singapore private company limited by shares to a Singapore public company limited by shares and, in connection therewith, adopted an amended and restated constitution (the "Holdco A&R Constitution"); (2) Merger Sub 1 amalgamated with Horizon, with Horizon surviving as the amalgamated company and a wholly-owned subsidiary of the Issuer (the "Amalgamation"); (3) Merger Sub 2 merged with and into and DMY, with DMY surviving the merger as a wholly-owned subsidiary of the Issuer (the "SPAC Merger"); and (4) the other transactions contemplated by the Business Combination Agreement and documents related thereto (such transactions, together with the Amalgamation and the SPAC Merger, the "Business Combination"). Prior to the Business Combination, Mr. You was the Chairman, Chief Executive Officer and Chief Financial Officer of DMY, a shareholder and warrantholder of DMY, and an investor in a simple agreement for future equity ("SAFE") of Horizon. Immediately prior to the Business Combination and related …The first part of Item 4 of the SCHEDULE 13D filed 2026-03-20; the filing has the rest

Joseph Francis Fitzsimons

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 Pte. Ltd. ("Horizon"), dMY Squared Technology Group, Inc. ("DMY"), Rose Acquisition Pte. Ltd. ("Merger Sub 1"), and Horizon Merger Sub 2, Inc. ("Merger Sub 2"), pursuant to which, and subject to the satisfaction or waiver of certain conditions set forth therein, on March 19, 2026, the following occurred: (1) the Issuer converted from a Singapore private company limited by shares to a Singapore public company limited by shares and, in connection therewith, adopted an amended and restated constitution (the "Holdco A&R Constitution"); (2) Merger Sub 1 amalgamated with Horizon, with Horizon surviving as the amalgamated company and a wholly-owned subsidiary of the Issuer (the "Amalgamation"); (3) Merger Sub 2 merged with and into DMY, with DMY surviving the merger as a wholly-owned subsidiary of the Issuer (the "SPAC Merger"); and (4) completion of the other transactions contemplated by the Business Combination Agreement and documents related thereto (such transactions, together with the Amalgamation and the SPAC Merger, the "Business Combination"). Prior to the Business Combination, Dr. Fitzsimons was the Chief Executive Officer, Chairman and a shareholder of Horizon. Immediately prior to the Business …The first part of Item 4 of the SCHEDULE 13D filed 2026-03-31; the filing has the rest

IonQ, Inc.

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 Subscription Agreement and the Side Letter, as further described in Item 6, the Reporting Person intends to review its investment in the Issuer on a continuing basis. Depending on various factors, including, without limitation, the Issuer's financial position and strategic direction, actions taken by the Board of Directors of the Issuer (the "Issuer Board"), current and anticipated future price levels of the Issuer's securities, the relative attractiveness of alternative business and investment opportunities and other general economic and market conditions, the Reporting Person may in the future take such actions with respect to its investment as it considers appropriate, which may include, without limitation: - communicating with the Issuer's management and the Issuer Board, including any member thereof and other securityholders of the Issuer and other relevant parties; - exercising the Reporting Person's right under the Side Letter to designate a member of the Issuer Board; - acquiring additional securities of the Issuer (which may include rights or securities exercisable or convertible into securities of the Issuer) or disposing of some or all such securities then owned by the Reporting Person from time …The first part of Item 4 of the SCHEDULE 13D filed 2026-04-01; the filing has the rest

Peak XV Partners Seed Investment

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 Issuer from time to time in open market or private transactions, depending on its evaluation of the Issuer's business, prospects and financial condition, the market for the Issuer's securities, other developments concerning the Issuer, the reaction of the Issuer to the Reporting Persons' ownership of the Issuer's securities, other opportunities available to the Reporting Persons, and general economic, money market and stock market conditions. In addition, depending upon the factors referred to above, the Reporting Persons may dispose of all or a portion of their securities of the Issuer at any time (including by means of programs adopted pursuant to Rule 10b5-1 under the Act). Each of the Reporting Persons reserves the right to increase or decrease its holdings on such terms and at such times as each may decide. Except as set forth in this Item 4 and Item 6 below, none of the Reporting Persons has a present plan or proposal that relates to or would result in any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D of the Act. However, each of the Reporting Persons reserves the right to propose or participate in future transactions which may result in one or more of such …The first part of Item 4 of the SCHEDULE 13D filed 2026-07-09; the filing has the rest

Timeline

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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