Hong Kong stocks closed lower, with the Hang Seng Index down 0.6% and the Tech Index up 0.21%. Optical communication, pharmaceutical outsourcing, and PCB concepts all strengthened throughout the day, with WuXi AppTec (02359.HK) rising about 11%, Zhipu (02513.HK) rising over 7%, and SMIC (00981.HK) rising about 5%.