China Unicom (Hong Kong) Limited (the "Company") was incorporated in Hong Kong in February 2000 and was listed on the New York Stock Exchange and The Stock Exchange of Hong Kong Limited on 21 June 2000 and 22 June 2000 respectively. On 1 June 2001, the Company was included as a constituent stock of the Hang Seng Index.
The Company merged with China Netcom Group Corporation (Hong Kong) Limited on 15 October 2008. The ultimate parent company of the Company, China United Network Communications Group Company Limited ("Unicom Group") also gained approval and officially merged with China Network Communications Group Corporation ("Netcom Group") on 6 January 2009.
As at 31 December 2016, Unicom Group held 61.94% of the shares in the Company through China United Network Communications Limited ("A Share Company"), China Unicom (BVI) Limited and China Unicom Group Corporation (BVI) Limited; the public shareholders of A Share Company held 12.42% of the shares in the Company through A Share Company’s shareholding in China Unicom (BVI) Limited. The remaining 25.64% of the shares in the Company were held by public shareholders at The Stock Exchange of Hong Kong Limited and New York Stock Exchange.