Officer/Director Change - Horizon Space Acquisition II Corp.

Xu Qian, a director of Horizon Space Acquisition II Corp. (HSPT), has voluntarily filed an "Exit" Form 4. This filing reports that as of June 12, 2026, following the consummation of the initial business combination, Xu Qian no longer serves as a director and does not hold any ordinary shares of HSPT. Consequently, Xu Qian is no longer subject to Section 16 reporting requirements. The business combination involved HSPT and several entities including SL Science Holding Limited. This change is effective from June 12, 2026.