Shanghai Stock Exchange began to compile and publish the Shanghai Stock Exchange on July 5, 199 1, with a base period of 1990 and a base period value of 100, taking all listed stocks as samples and taking stock circulation as weight. Its calculation formula is:

Today's stock price index = today's total stock market value ÷ basic stock market value × 100.

The Shanghai and Shenzhen 300 Index is based on 65438+February 3, 20041and the adjusted market value of 300 constituent stocks on that day. Base designated as 1000 point, officially released on April 8, 2005. The calculation formula is:

Index of reporting period = adjusted market value of constituent stocks in reporting period/adjusted market value of constituent stocks on benchmark date × 1000.