Hong Kong stocks opened lower, with the Hang Seng Index down 1.15% and the Tech Index down 1.39%. NIO Inc. (09866.HK) fell more than 4%, while Alibaba Group (09988.HK), Zijin Mining (02899.HK), Weichai Power (02338.HK), and Trip.com Inc. (09961.HK) all fell by 2%.