Shanghai and Shenzhen 300 Stock Indexes The Shanghai and Shenzhen 300 Index compiled by China Securities Index Company was officially released on April 8, 2005. The benchmark date of the Shanghai and Shenzhen 300 Index is 65438+February 3, 20041,and the benchmark date is 1000 points. The Shanghai and Shenzhen 300 Index selects 300 A shares as samples, including Shanghai Stock Exchange 179 and Shenzhen Stock Exchange 12 1. The sample of the Shanghai and Shenzhen 300 Index covers about 60% of the market value of the Shanghai and Shenzhen markets, which has a good market representation. As a commodity.