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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.