In 2001, BOC regrouped its Hong Kong operations into Bank of China (Hong Kong); then BOCHK listed on the Hong Kong Stock Exchange in October 2002. Two-thirds of its share capital are in free float. The bank's headquarters in Hong Kong are located in the Bank of China Tower, designed by the renowned architect I.M. Pei, and was opened to the public in 1990 as the tallest building in Hong Kong at that time.[citation needed]