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The Hang Seng Index (abbreviated: HSI, Chinese: 恒生指數) is a freefloat-adjusted market capitalization-weighted stock market index in Hong Kong. It is used to record and monitor daily changes of the largest companies of the Hong Kong stock market and is the main indicator of the overall market performance in Hong Kong. These 50 constituent companies represent about 58% of the capitalisation of the Hong Kong Stock Exchange. HSI was started on November 24, 1969, and is currently compiled and maintained by Hang Seng Indexes Company Limited, which is a wholly owned subsidiary of Hang Seng Bank, one of the largest banks registered and listed in Hong Kong in terms of market capitalisation. It is responsible for compiling, publishing and managing the Hang Seng Index and a range of other stock indexes, such as Hang Seng China Enterprises Index, Hang Seng China AH Index Series, Hang Seng China H-Financials Index, Hang Seng Composite Index Series, Hang Seng China A Industry Top Index, Hang Seng Corporate Sustainability Index Series and Hang Seng Total Return Index Series. Hang Seng in turn, despite being a public company, is held in majority by British financial firm HSBC.

The Shenzhen Stock Exchange (SZSE; Chinese: 深圳证券交易所) is one of China's three stock exchanges, alongside the Shanghai Stock Exchange and Hong Kong Stock Exchange. It is based in the Futian district of Shenzhen, Guangdong. With a market capitalization of its listed companies around US$2.285 trillion in 2015, it is the 8th largest stock exchange in the world, and 4th largest in East Asia and Asia.