Business Description

Note 1 — Organization, Business Operation and Going Concern Consideration Horizon Space Acquisition II Corp. (the “Company”) is a blank check company incorporated in the Cayman Islands on March 21, 2023 (“Inception”). The Company was formed for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization, or similar business combination with one or more businesses (the “Business Combination”). The Company has selected December 31 as its fiscal year end. As of December 31, 2025, the Company had not commenced any operations. For the period from March 21, 2023 (inception) through December 31, 2025, the Company’s efforts have been limited to organizational activities as well as activities related to the initial public offering, identifying a target company for a Business Combination and completing the SL Bio Business Combination (as defined below). The Company will not generate any operating revenues until after the completion of a Business Combination, at the earliest. The Company will generate non-operating income in the form of dividend and/or interest income from the proceeds derived from the IPO (as defined below) and private placement (“Private Placement,” see Note 4). The Company’s founder and sponsor is Horizon Space Acquisition II Sponsor Corp., a Cayman Islands company (the “Sponsor”). The Company’s ability to commence operations is contingent upon obtaining adequate financial resources through IPO and the Private Placement. On November 18, 2024, the Company consummated its initial public offering (the “IPO”) of 6,000,000 units (“Units”). Each unit consists of one ordinary share, and one right to receive one-tenth (1/10) of one ordinary share. Each ten rights entitle the holder thereof to receive one ordinary share upon the consummation of the Business Combination. The Units were sold at an offering price of $10.00 per Unit, generating total gross proceeds of $60,000,000. On November 19, 2024, the underwriter notified the Company of its exercise of the over-allotment option in full to purchase additional 900,000 Units of the Company (the “Over-Allotment Option”). As a result, on November 21, 2024, 900,000 Units were sold to the underwriter at an offering price of $10.00 per Option Unit (the “Option Units” and together with the Units, collectively, the “Public Units”), generating gross proceeds of $9,000,000. (refer to Note 3) Simultaneously with the consummation of the IPO and the sale of the Units, the Company consummated the private placement (“Private Placement”) of 200,000 units (the “Initial Private Units”) to the Sponsor, at a price of $10.00 per Initial Private Unit, generating total proceeds of $2,000,000, which is described in Note 4. Simultaneously with the issuance and sale of the Option Units, the Company completed a private placement sale of additional 13,500 units (the “Additional Private Units” and together with the Initial Private Units, collectively, the “Private Units”) to the Sponsor at a purchase price of $10.00 per Additional Private Unit, generating gross proceeds of $135,000. Transaction costs amounted to aggregated total of $1,844,819, consisting of $1,035,000 of underwriting commissions which was paid in cash at the closing date of the IPO, and upon the exercise of the overallotment option, $341,602 of the Representative Shares (discussed in the below), and $468,217 of other offering costs. At the IPO date, cash of $939,635 was held outside of the Trust Account (as defined below) and is available for the payment of accrued offering costs and for working capital purposes. In conjunction with the IPO, the Company issued to the underwriter 210,000 ordinary shares for no consideration (the “Representative Shares”). The fair value of the Representative Shares accounted for as compensation under Accounting Standards Codification (“ASC”) 718, “Compensation – Stock Compensation” (“ASC 718”) is included in the offering costs. The fair value of the Representative Shares was estimated by using Black Scholes model as of the IPO date totaled $297,045. In connection with the exercised of the underwriter’s over-allotment option, the Company issued additional 31,500 Representative Shares to the underwriter with fair value of $44,557.…