X0609 4 2026-06-12-05:00 true 0002032950 Horizon Space Acquisition II Corp. HSPT 0001879076 Xu Qian false C/O HORIZON SPACE ACQUISITION II CORP. 1412 BROADWAY, 21ST FLOOR, SUITE 21V NEW YORK NY 10018 true false false false false This "Exit" Form 4 is voluntarily filed to report that, in connection with the consummation of the initial business combination of Horizon Space Acquisition II Corp. ("HSPT") on June 12, 2026 pursuant to the Business Combination Agreement dated May 9, 2025 by and among HSPT, SL Science Holding Limited, a Cayman Islands exempted company limited by shares, SL BIO Ltd., a Cayman Islands exempted company limited by shares, CW Mega Limited, a Cayman Islands exempted company limited by shares, and WW Century Limited, a Cayman Islands exempted company limited by shares, the Reporting Person no longer served as a director of HSPT or held any ordinary shares of HSPT after June 12, 2026, and therefore is no longer subject to Section 16 reporting. /s/ Qian Xu 2026-06-16