Hang Seng Bank is also responsible for calculating the reference index of Hong Kong stock market: Hang Seng Index. Hang Seng Bank is one of the 33 constituent stocks of the Hang Seng Index, which is an important indicator of the Hong Kong stock market. In addition, the shares of Hang Seng Bank in Hong Kong are also listed and traded on the London Stock Exchange, and an American Depositary Receipt Scheme in the form of primary sponsorship is provided for American investors.
As of February 2007, the total market value of Hang Seng reached HK$ 26,543,880.5 billion, making it the largest locally registered and listed bank in Hong Kong. The long-term goal is to become a leading regional bank in Greater China, focusing on South China and the Yangtze River Delta.
According to the 2005 Hang Seng Bank Annual Report, Its 39 subsidiaries are as follows: UnionPay Insurance Co., Ltd., Bright Future Investment Co., Ltd., Eternal International Co., Ltd., Zhengfeng Investment Co., Ltd., Hengzhili Co., Ltd., Hang Seng Asset Management (Private) Co., Ltd., Hang Seng Bank Trust Co., Ltd., Hang Seng Bank Trust (Bahamas) Co., Ltd., Hang Seng Bank Trust International Co., Ltd. Limited Hang Seng Credit Limited Hang Seng Deposit (Bahamas) Limited Hang Seng Credit Card Limited Hang Seng Information Service Limited Hang Seng Finance (Bahamas) Limited Hang Seng Financial Information Limited Hang Seng Futures Limited Hang Seng Insurance Limited Hang Seng Insurance (Bahamas) Hang Seng Investment Management Co., Ltd. Hang Seng Investment Service Co., Ltd. Hang Seng Life Insurance Co., Ltd. Hang Seng Property Management Co., Ltd. Hang Seng Securities Co., Ltd. Hayden Lake Co., Ltd. Gao Tai Investment Co., Ltd. Hang Seng Index International Co., Ltd. Hang Seng Index Service Co., Ltd. Yimengsen Co., Ltd. Honglve Investment Co., Ltd. Yongnian Advertising Co., Ltd. Yinxi Co., Ltd. Qiao Yu Investment Co., Ltd. Ennian Development Co., Ltd.