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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.
Horizon Quantum Holdings Ltd. reported an indirect insider purchase linked to its business combination closing. On March 19, 2026, Penchant Family Holdings LLC acquired 84,602 Class A Ordinary Shares at $11.82 per share, for an aggregate price of approximately $1,000,000. The shares are held by Penchant Family Holdings LLC, which is controlled by Penchant Holdings, Inc., where director Danielle Lambert serves as President, so her interest is through this affiliated entity rather than direct personal ownership.
Tan Si-Hui reported acquisition or exercise transactions in this Form 4 filing.
Horizon Quantum Holdings Ltd. reported that Chief Science Officer Dr. Tan Si-Hui received a grant of 500,000 stock options on March 19, 2026. Each option is exercisable at $0.15 per Class A Ordinary Share and is exercisable for 2.43499 Class A Ordinary Shares, covering 1,217,494 underlying Class A Ordinary Shares.
These fully vested options were not a new cash purchase but were issued in exchange for Dr. Tan’s 500,000 Legacy Horizon stock options as part of the closing of the Business Combination under the Business Combination Agreement. Following this exchange, Dr. Tan holds 500,000 Company stock options directly.
Horizon Quantum Holdings Ltd. reported that Chief Financial Officer Greg Gould received a grant of 285,300 stock options as part of the company’s recent business combination. Each option is exercisable into 2.43499 Class A Ordinary Shares, covering 694,702 shares in total, at an exercise price of $5.13 per share, and expires on August 15, 2035.
The award reflects an exchange of Mr. Gould’s prior Legacy Horizon options for equivalent company options at the March 19, 2026 business combination closing. The options vest quarterly in 16 equal installments beginning August 15, 2025; as of March 24, 2026, 35,662 options are vested and exercisable, with 249,638 scheduled to vest over time, contingent on continued employment.
Horizon Quantum Holdings Ltd. has filed its annual report as a newly listed Nasdaq company following a SPAC business combination with dMY Squared Technology Group. The all-share deal valued Horizon’s equity consideration at $508,384,000 and converted legacy shares, SAFEs and options into new ordinary shares.
In parallel, Horizon completed a PIPE financing of 9,126,021 Class A ordinary shares at $11.82 per share for roughly $108 million, plus about $13 million from the dMY trust. Pro forma as of March 19, 2026, cash and cash equivalents were SGD 138,000,887 and total equity was SGD 125,911,521, with 51,578,134 ordinary shares and 6,044,154 warrants outstanding.
The company develops quantum software infrastructure, including its Triple Alpha development environment, but remains early-stage. Revenue was only SGD 360,000 in 2024 while net loss reached SGD 7,483,174, and management discloses substantial doubt about its ability to continue as a going concern without raising additional capital.
Horizon Quantum Holdings Ltd. Schedule 13G: Tencent Holdings Limited and affiliate THL A12 Limited reported beneficial ownership of 4,175,570 Class A Ordinary Shares, representing 13.1% of Class A shares outstanding. Shares outstanding were 31,833,549 as of March 19, 2026. Tencent states that THL A12 Limited is a direct wholly-owned subsidiary, and Tencent may be deemed to beneficially own the same 4,175,570 shares. The filing is a joint filing and is signed by Ma Huateng and Gu Tingting Jackie on March 25, 2026.
Horizon Quantum Holdings Ltd. reported that Chief Executive Officer and director Dr. Joseph Francis Fitzsimons acquired 19,744,585 Class B Ordinary Shares on March 19, 2026 at a stated price of $0.00 per share as a grant/award acquisition.
The footnotes explain that this occurred when the company completed its business combination under the Business Combination Agreement dated September 9, 2025. Dr. Fitzsimons exchanged 8,108,696 ordinary shares of Horizon Quantum Computing Pte. Ltd. for the 19,744,585 Class B Ordinary Shares.
Each Class B Ordinary Share is convertible at any time into one Class A Ordinary Share. Following this transaction, Dr. Fitzsimons directly holds 19,744,585 Class B Ordinary Shares, reflecting his continuing equity stake after the business combination.
Horizon Quantum Holdings Ltd. reported that dMY Squared Sponsor, LLC, an entity associated with director and 10% owner Harry L. You, acquired indirect equity interests in connection with the closing of its business combination with Horizon Quantum Computing Pte. Ltd. and dMY Squared Technology Group, Inc.
The Sponsor received 1,163,484 Class A ordinary shares as a grant in exchange for 1,163,484 shares of DMY Class A common stock, and 2,884,660 warrants to purchase Class A ordinary shares at an exercise price of $11.50 per share, both at a transaction price of $0.00 per security. On the business combination effective date, DMY’s Class A common stock closed at $13.50 and its warrants at $2.69.
After these transactions, Mr. You is reported with 1,163,484 Class A ordinary shares and 2,884,660 warrants held indirectly through the Sponsor and 49,214 Class A ordinary shares held directly, while each reporting person disclaims beneficial ownership except to the extent of pecuniary interest.