The SSE Composite Index also known as SSE Index is a stock market index of all stocks (A shares and B shares) that are traded at the Shanghai Stock Exchange.

[2] There are also SSE 180, SSE 50 and SSE Mega-Cap Indexes for top 180, 50 and 20 companies respectively, and the CSI 300 Index, which includes shares traded at the Shanghai Stock Exchange and the Shenzhen Stock Exchange.

SSE Indices are all calculated using a Paasche weighted composite price index formula.

The base day for SSE Composite Index is December 19, 1990, and the base period is the total market capitalization of all stocks of that day.

[2] Current index = Current total market cap of constituents × Base Value / Base Period Total market capitalization = Σ (price × shares issued) The following table shows the annual development of the SSE Composite Index since 1990.