High Quality Content by WIKIPEDIA articles! The Hong Kong Stock Exchange (HKEX; SEHK: 0388) is a stock exchange located in Hong Kong. It is Asia`s third largest stock exchange in terms of market capitalization behind the Tokyo Stock Exchange and the Shanghai Stock Exchange and fifth largest in the world. As of 31 Dec 2010, the Hong Kong Stock Exchange had 1,413 listed companies with a combined market capitalization of $2.7 trillion. Hong Kong Exchanges and Clearing is the holding company for the exchange.