Chinese e-commerce giant Alibaba Group Holding Ltd., smartphone maker Xiaomi Corp. and WuXi Biologics (Cayman) Inc., a China-based provider of biologics services, will be added to Hong Kong's Hang Seng Index.

The major changes will be effective Sept. 7, Hang Seng Indexes Company Limited announced Aug. 14.

The three companies will replace Sino Land Co. Ltd., Want Want China Holdings Ltd. and China Shenhua Energy Co. Ltd. on the index.