CSI 500 is an index developed by CSI Index Co., Ltd. Its sample selection is to exclude the constituent stocks of CSI 300 Index in A-shares and select the top 500 stocks with total market value to comprehensively reflect the stock price performance of A-share small and medium-sized companies. CSI 500 is also called CSI 500 Index, and CSI 500 Index is also called CSI Small Cap 500 Index, referred to as CSI 500. The code of Shanghai Stock Exchange is 000905 and the code of Shenzhen Stock Exchange is 399905.

In order to reflect the overall performance of stocks with different scale characteristics in the market, CSI Index Co., Ltd. established a scale index system including large-cap, medium-cap, small-cap, large-medium-cap, small-cap and large-medium-cap indexes on the basis of the Shanghai and Shenzhen 300 Index, which provided rich analytical tools and performance benchmarks for the market and laid a foundation for the research and development of index products and other indexes.

The constituent stocks of the CSI 500 Index are mainly concentrated in the growing industries such as electronics, computers and media. Some enterprises expanded through mergers and acquisitions when the market was hot, which led to a high risk of goodwill impairment in the past two years. Under the guidance of supply-side reform, these overheated growth company bubbles gradually squeezed out, and the valuation of the CSI 500 index has been lower than most of the history.

CSI 500 index funds include CCB CSI 500(000478), Guo Fu CSI 500 (161kloc-0/7), Jing Shun Great Wall Quantitative Selection (000978) and Huatai Bairui Quantitative First (460009). The last two names do not contain CSI 500, but they are also based on CSI 500.