Horizon Space Acquisition I Corp.

Item 1.01. Entry into a Material Definitive Agreement. On April 20, 2026, Horizon Space Acquisition I Corp., a Cayman Islands exempted company (the “Company”) held an extraordinary general meeting of shareholders (the “Shareholder Meeting”), where the shareholders of the Company approved, among others, the Company to amend the Investment Management Trust Agreement dated December 21, 2022, as further amended (the “Trust Agreement”), by and between the Company and Continental Stock Transfer & Trust Company, a New York limited purpose trust company (the “Trustee”) to provide that the Trustee must commence liquidation of the Company’s trust account (the “Trust Account”) by June 12, 2027. Upon the shareholders’ approval, on April 20,2026 the Company and the Trustee entered into the amendment to the Trust Agreement. A copy of the amendment to the Trust Agreement (the “Trust Amendment”) is attached to this Current Report on Form 8-K as Exhibit 10.1 and is incorporated herein by reference. The foregoing description of the Trust Amendment does not purport to be complete and is subject to, and is qualified in its entirety by, the full text of the Trust Amendment.

Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year. At the Shareholder Meeting, the shareholders of the Company approved the proposal to amend Articles 48.7 and 48.8 of the Company’s Amended and Restated Memorandum and Articles of Association (the “Charter”) to provide that the Company must (i) consummate a business combination, or (ii) cease its operations except for the purpose of winding up if it fails to complete such Business Combination and redeem or repurchase 100% of the Company’s public shares included as part of the public units issued in the Company’s initial public offering, by June 12, 2027 (the “Termination Date”). A copy of the Amended Charter is attached to this Current Report on Form 8-K as Exhibit 3.1 and is incorporated herein by reference. The foregoing description of the Amended Charter does not purport to be complete and is subject to, and is qualified in its entirety by, the full text of the Amended Charter.

Item 5.07. Submission of Matters to a Vote of Security Holders. On March 26, 2026, the record date of the Shareholder Meeting, there were 2,404,234 issued and outstanding Ordinary Shares, approximately 89.25% of which were represented in person or by proxy at the Shareholder Meeting. The final results for the matter submitted to a vote of the Company’s shareholders at the Shareholder Meeting are as follows: 1. The Charter Amendment Proposal The shareholders approved the proposal to amend the Company’s Charter to provide that the Company must (i) consummate a business combination, or (ii) cease its operations except for the purpose of winding up if it fails to complete such business combination and redeem or repurchase 100% of the Company’s public shares included as part of the public units issued in the Company’s initial public offering, by June 12, 2027. The voting results were as follows: FOR AGAINST ABSTAIN ─────────────────────────────────────── 2,145,692 0 100 2. The Trust Amendment Proposal The shareholders approved the proposal to amend the Trust Agreement to provide that the Trustee must commence liquidation of the Trust Account by June 12, 2027. The voting results were as follows: FOR AGAINST ABSTAIN ─────────────────────────────────────── 2,145,692 0 100 Item 8.01. Other Events. In connection with the votes to approve the Charter Amendment Proposal, 34,818Ordinary Shares of the Company were rendered for redemption. As a result, the Company has 2,369,416 Ordinary Shares issued and outstanding.

Item 8.01. Other Events. In connection with the votes to approve the Charter Amendment Proposal, 34,818Ordinary Shares of the Company were rendered for redemption. As a result, the Company has 2,369,416 Ordinary Shares issued and outstanding.