Horizon Quantum Holdings Ltd. (NASDAQ:HQ) ("Horizon Quantum," "Horizon," or "the Company"), a pioneer of software infrastructure for quantum applications, today wishes to clarify certain information regarding the Company in light of concerns that there may have been incorrect information in the market for a period yesterday:

• Issued and Outstanding Common Equity. As of September 14, 2026, the Company had 34,811,740 Class A Ordinary Shares and 19,744,585 Class B Ordinary Shares issued and outstanding.
• Business Combination Lock-Up Agreements. The lock-up agreements entered into by certain shareholders of the Company in connection with the Company’s business combination with dMY Squared Technology Group, Inc. on March 19, 2026 (the "Business Combination"), do not expire until the earlier of (i) the date on which the Company completes a liquidation, merger, capital share exchange, reorganization or other similar transaction that results in all of the Company’s shareholders having the right to exchange their Class A Ordinary Shares for cash, securities or other property, and (ii) twenty four (24) months after the closing date of the Business Combination, or March 19, 2028, with the exception of one shareholder whose lockup expires eighteen (18) months after the closing date of the Business Combination, or September 19, 2027. To date, all lock-up agreements entered into in connection with the Business Combination are still in effect.

To the extent there are any questions regarding the foregoing information, investors are encouraged to submit enquiries to investors@horizonquantum.com.

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investors@horizonquantum.com