Hang Seng Bank, Limited (Chinese: 恒生銀行有限公司) is a Hong Kong-based banking and financial services company with headquarters in Central, Hong Kong. It is one of Hong Kong's leading public companies in terms of market capitalisation and is part of the HSBC Group, which holds a majority equity interest in the bank.Hang Seng Bank is a commercial bank whose major business activities include retail banking, wealth management, commercial banking, treasury services, and private banking. Hang Seng Bank operates a network of around 260 service outlets in Hong Kong. It also has a wholly owned subsidiary in mainland China, Hang Seng Bank (China) Limited which has a network of 46 branches and sub branches.It established the Hang Seng Index as a public service in 1969 and this stock market index is now generally known as the primary indicator of the Hong Kong stock market.