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Horizon Quantum Holdings Ltd. received a Schedule 13D from Peak XV–affiliated funds, which jointly report beneficial ownership of 6,468,999 Class A Ordinary Shares, or 20.3% of the class based on 31,833,549 shares outstanding as of April 24, 2026. These shares stem from a $6,000,000 investment made between March 2020 and July 2025 in Horizon Quantum Computing Pte. Ltd., which converted into Horizon Quantum shares at the March 16, 2026 business combination closing. The Peak XV vehicles describe the position as an investment holding and say they may buy more or sell shares depending on business and market conditions, though they report no trades in the past 60 days. Their shares are largely subject to a lock-up lasting up to 24 months after closing, except that about 9.0% of each non‑affiliate holder’s position, including theirs, was released early. They also benefit from a registration rights agreement under which their resale registration statement was filed on April 16, 2026 and declared effective on April 23, 2026.
Horizon Quantum Holdings Ltd. filings state that ICS Opportunities, Ltd., Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander reported coordinated ownership information relating to Class A Ordinary Shares. The filing notes these reporting persons acquired beneficial ownership in excess of 5% on 06/17/2026 and by the filing date ceased to be beneficial owners of more than 5%.
The cover data shows shared voting and dispositive power values reported as 17,500 and 20,632 shares for certain reporting persons, and a Joint Filing Agreement dated June 24, 2026.
Horizon Quantum Holdings Ltd. filed an initial insider ownership report for its Chief Legal Officer, Catherine Michele Fitzsimons. This Form 3 identifies her as an officer of the company but does not list any common stock or derivative security holdings or transactions.
Horizon Quantum Holdings Ltd. reported its first quarter 2026 results, its first as a public company following the business combination with dMY Squared Technology Group, Inc. The deal transformed its balance sheet, lifting cash and cash equivalents to $96.6 million as of March 31, 2026, from $222,939 at December 31, 2025.
Total assets rose to $102.3 million, while stockholders’ equity improved from a deficit of $(4.7) million to positive equity of $83.9 million, reflecting new Ordinary Class A and Class B shares and conversion of prior preferred shares and SAFE liabilities into equity. The company remains in an investment phase, posting a net loss of $3.6 million, or $(0.09) per share, for the quarter.
Horizon Quantum highlighted progress in its quantum software platform Triple Alpha, expansion of its in-house quantum hardware testbed to add a second system, and new collaborations with hardware providers Alice & Bob and AQT. It also presented non-GAAP metrics, reporting first quarter EBITDA of $(3.3) million and Adjusted EBITDA of $(4.1) million, emphasizing continued investment in research, development, and business combination-related costs.
Horizon Quantum Holdings Ltd. reported that on April 29, 2026, Peter Oey was appointed to its Board of Directors. He will serve as chairman of the audit committee and a member of the compensation committee, strengthening the company’s financial oversight and governance structure.
Harry You will remain on the audit committee, while Danielle Lambert, who chairs the nominating & corporate governance committee, will step down from the audit and compensation committees. The company highlights Mr. Oey’s extensive experience as Chief Financial Officer of Grab Holdings Ltd. and prior senior finance roles as the basis for his selection.
Horizon Quantum Holdings Ltd. files its annual Form 20-F, detailing completion of its SPAC business combination with dMY Squared Technology Group and listing of Class A ordinary shares and warrants on Nasdaq. Horizon develops quantum software tools that depend on third‑party quantum hardware.
The filing explains that Horizon paid $508,384,000 in all‑share Merger Consideration and closed a PIPE Private Placement of $110,412,500 (9,196,020 Class A shares at $11.82), generating roughly $120 million of gross proceeds together with SPAC trust funds. As of March 19, 2026, 51,578,134 Company Ordinary Shares and 6,044,154 Company Warrants were outstanding.
Horizon reports it is early stage, with net losses of S$23.1 million in 2025 and S$7.5 million in 2024 and an accumulated deficit of S$44.5 million, and has not generated material product revenue. Research and development expenses were 48.5% and 44.0% of operating losses in 2025 and 2024. The company warns it will require significant cash, may need additional financing, and faces extensive risks around technology development, market adoption of quantum computing, competition, reliance on hardware and cloud partners, supply chains, talent retention and cybersecurity.
The report also notes a waiver from the Singapore Securities Industry Council exempting Horizon from most provisions of the Singapore Take‑Over Code, except in certain tender offers relying on the U.S. Tier 1 exemption.
Horizon Quantum Holdings Ltd. filed a report describing a new strategic agreement with IonQ, under which Horizon Quantum will acquire one of IonQ’s first 6th-generation, chip-based 256-qubit trapped-ion quantum systems. This system is designed with microwave gate operations, 99.99% gate fidelity, and all-to-all connectivity to support more complex and accurate quantum computations.
Horizon Quantum plans to integrate the IonQ trapped-ion system into its Triple Alpha software platform, extending its hardware testbed beyond an initial superconducting system to a second, distinct hardware modality. The company aims to build a hardware-agnostic environment for quantum software development, enabling advanced capabilities such as general control flow, dynamic memory allocation, and concurrent classical/quantum function evaluation in adaptive quantum programs.
Horizon Quantum Holdings Ltd. director Jill Ann Turner filed an initial Form 3, which is a required disclosure of insider holdings. This filing does not report any buy or sell transactions, derivative exercises, gifts, or other changes in ownership, and shows no reportable holdings at this time.
IonQ, Inc. filed a Schedule 13D reporting beneficial ownership of 4,230,118 Class A Ordinary Shares of Horizon Quantum Holdings Ltd., representing 13.3% of the class based on 31,833,549 shares outstanding as of March 20, 2026.
IonQ bought the shares for investment using cash on hand under a December 4, 2025 Subscription Agreement and Side Letter tied to Horizon’s De-SPAC transaction completed on March 19, 2026. IonQ holds sole voting and dispositive power over these shares and has rights to demand registration, designate a board member, and receive a right of first notification on certain transactions, and may consider additional strategic or transactional steps over time.
Horizon Quantum Holdings Ltd. shareholder Joseph Francis Fitzsimons reports major ownership and control following the SPAC business combination. He beneficially owns 19,744,585 Class B Ordinary Shares, representing approximately 38.3% of the Ordinary Shares on an as-converted basis and 65.0% of the issuer’s total voting power as of March 19, 2026.
His Horizon shares were converted into Class B Ordinary Shares at closing of the business combination with dMY Squared Technology Group, Inc. These Class B shares are convertible one-for-one into Class A Ordinary Shares but carry three votes per share. Fitzsimons, the company’s CEO and Board Chairman, is subject to a two-year lock-up on these Class B shares and is party to a Registration Rights Agreement covering resales of underlying Class A Ordinary Shares.