SEC Form 425 filed by dMY Squared Technology Group Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 10, 2026

dMY Squared Technology Group, Inc.

(Exact name of registrant as specified in its charter)

1180 North Town Center Drive, Suite 100

Las Vegas, Nevada 89144

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (702) 781-4313

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

As previously disclosed, on September 9, 2025, dMY Squared Technology Group, Inc., a Massachusetts corporation (“dMY”) entered into a business combination agreement (the “Business Combination Agreement”) with Horizon Quantum Holdings Ltd. (Company Registration No.: 202537774K), a Singapore public company limited by shares (“Holdco”), Horizon Quantum Computing Pte. Ltd. (Company Registration No.: 201802755E), a Singapore private limited company by shares (“Horizon”), and the other parties thereto, with respect to a potential business combination (the “Business Combination”).

On March 10, 2026, dMY and Horizon issued a press release announcing several milestones in Horizon’s business and the transaction and inviting interested parties to join a live X Spaces event. The press release is furnished hereto as Exhibit 99.1 and incorporated by reference into this Item 7.01.

The foregoing (including Exhibit 99.1) is being furnished pursuant to Item 7.01 and will not be deemed to be filed for purposes of Section 18 of the Exchange Act, or otherwise be subject to the liabilities of that section, nor will it be deemed to be incorporated by reference in any filing under the Securities Act or the Exchange Act.

Additional Information about the Business Combination and Where to Find It

In connection with the Business Combination, Holdco and Horizon filed a registration statement on Form F-4 relating to the Business Combination and certain other matters (the “Registration Statement”), which includes a preliminary proxy statement of dMY and a preliminary prospectus of Holdco with respect to the securities to be offered in the Business Combination. The Registration Statement became effective on February 17, 2026. The same day, dMY filed and mailed a definitive proxy statement/prospectus (the “Proxy Statement”) to its shareholders as of the record date established for voting on the Business Combination. The Proxy Statement contains important information about the Business Combination and the other matters to be voted upon at a special meeting of shareholders of dMY (the “Special Meeting”). This Current Report on Form 8-K and the exhibit hereto do not contain all the information that should be considered concerning the Business Combination and other matters and are not intended to provide the basis for any investment decision or any other decision in respect of such matters. dMY, Holdco, and Horizon may also file other documents with the Securities and Exchange Commission (the “SEC”) regarding the Business Combination. dMY’s shareholders and other interested persons are advised to read the definitive proxy statement/prospectus and other documents filed in connection with the Business Combination, as these materials contain important information about dMY, Holdco, Horizon, and the Business Combination. The documents filed by dMY, Holdco, and Horizon with the SEC also may be obtained free of charge upon written request to dMY at dMY Squared Technology Group, Inc., 1180 North Town Center Drive, Suite 100, Las Vegas, Nevada 89144.

Participants in the Solicitation

dMY, Holdco, and Horizon and their respective directors, executive officers and other members of their management and employees, under SEC rules, may be deemed to be participants in the solicitation of proxies of dMY’s shareholders in connection with the Business Combination. Investors and security holders may obtain more detailed information regarding the names, affiliations and interests of dMY’s directors and officers in dMY’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on April 3, 2025 (the “dMY Annual Report”) or its subsequent quarterly reports. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of proxies to dMY’s shareholders in connection with the Business Combination is set forth in the Proxy Statement for the Business Combination. Information concerning the interests of Holdco’s, Horizon’s and dMY’s participants in the solicitation, which may, in some cases, be different than those of their respective equityholders generally, is set forth in the Proxy Statement relating to the Business Combination.

Disclaimer

Past performance by Horizon’s or dMY’s management teams and their respective affiliates is not a guarantee of future performance. Therefore, you should not place undue reliance on the historical record of the performance of Horizon’s or dMY’s management teams or businesses associated with them as indicative of future performance of an investment or the returns that Holdco, Horizon or dMY will, or are likely to, generate going forward.

Cautionary Note Regarding Forward-Looking Statements

This Current Report on Form 8-K and the exhibit hereto include “forward-looking statements” with respect to dMY, Holdco, and Horizon. The expectations, estimates, and projections of the businesses of Holdco, Horizon and dMY may differ from their actual results and consequently, you should not rely on these forward-looking statements as predictions of future events. Words such as “expect,” “estimate,” “anticipate,” “intend,” “may,” “will,” “could,” “should,” “potential,” “plan” and similar expressions are intended to identify such forward-looking statements. Forward-looking statements involve significant risks and uncertainties that could cause the actual results to differ materially from the expected results and are subject to, without limitation, (i) known and unknown risks, including the risks and uncertainties indicated from time to time in the dMY Annual Report, dMY’s other filings with the SEC, and the Registration Statement and Proxy Statement, including those under “Risk Factors” therein, and other documents filed or to be filed with the SEC by dMY, Holdco, or Horizon; (ii) uncertainties; (iii) assumptions; and (iv) other factors beyond dMY’s, Holdco’s, or Horizon’s control that are difficult to predict because they relate to events and depend on circumstances that will occur in the future. They are neither statements of historical fact nor promises or guarantees of future performance. Therefore, actual results may differ materially and adversely from those expressed or implied in any forward-looking statements and dMY, Holdco, and Horizon therefore caution against placing undue reliance on any of these forward-looking statements.

Many of these factors are outside of the control of dMY, Holdco, and Horizon and are difficult to predict. Factors that may cause such differences include, but are not limited to: (1) the occurrence of any event, change or other circumstances that could give rise to the termination of the business combination agreement, dated as of September 9, 2025, by and among dMY, Horizon and Holdco and the other parties thereto (the “Business Combination Agreement”); (2) the ability to successfully or timely consummate the private placement of an aggregate of approximately $111.9 million of Holdco’s Class A ordinary shares with certain institutional and accredited investors, qualified institutional buyers and strategic investors (the “PIPE Transaction”); (3) the outcome of any legal proceedings that may be instituted against the parties following the announcement of the Business Combination and the Business Combination Agreement; (4) the inability to complete the Business Combination, including due to the failure to obtain approval of the shareholders of Horizon and dMY or other conditions to closing the Business Combination; (5) changes to the structure of the Business Combination that may be required or appropriate as a result of applicable laws or regulations or as a condition to obtaining regulatory approval of the Business Combination; (6) Holdco’s ability to scale and grow its business, including through the use of proceeds of the PIPE Transaction, and the advantages and expected growth of Holdco; (7) the cash position of Holdco following the closing of the Business Combination; (8) the inability to obtain or maintain the listing of Horizon Quantum’s securities on the New York Stock Exchange, the NYSE American, or Nasdaq following the Business Combination; (9) the risk that the announcement and pendency of the Business Combination disrupts Horizon’s current plans and operations; (10) the ability to recognize the anticipated benefits of the Business Combination and PIPE Transaction, which may be affected by, among other things, competition, the ability of Holdco to grow and manage growth profitably and source and retain its key employees; (11) costs related to the Business Combination; (12) changes in applicable laws and regulations or political and economic developments; (13) the possibility that Holdco may be adversely affected by other economic, business and/or competitive factors; (14) Holdco estimates of expenses and profitability; (15) the amount of redemptions by dMY public shareholders; (16) difficulties operating Holdco’s quantum processor and the possibility that the quantum processor does not provide the advantages that Holdco expects; (17) the ability to successfully or timely consummate the PIPE Transaction; (18) the ability of Holdco to integrate access to its quantum computing test bed within its Triple Alpha platform; (19) the ability of our coding languages to provide additional abstraction when compared to other quantum computing solutions; (20) the entry into the Side Letter and our ability to recognize the benefits of the Side Letter; (21) other risks and uncertainties included in the “Risk Factors” sections of the dMY Annual Report, dMY’s other filings with the SEC, and the Registration Statement and other documents filed or to be filed with the SEC by Holdco, Horizon and dMY. The foregoing list of factors is not exclusive. You should not place undue reliance upon any forward-looking statements, which speak only as of the date made. Holdco, Horizon and dMY do not undertake or accept any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements to reflect any change in their expectations or any change in events, conditions, or circumstances on which any such statement is based, except as required by law.

No Offer or Solicitation

This Current Report on Form 8-K and the exhibit hereto do not constitute a solicitation of a proxy, consent, or authorization with respect to any securities or in respect of the Business Combination. This Current Report on Form 8-K and the exhibit hereto also do not constitute an offer to sell or the solicitation of an offer to buy any securities, nor will there be any sale of securities in any states or jurisdictions in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities will be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: March 10, 2026