The CSI 500 is a broad-based index, which does not distinguish between industries. Its constituent stocks are the top 500 companies by market capitalization after excluding the largest 300 companies by market capitalization in the Shanghai and Shenzhen stock markets. It can be understood as representing mid-cap stocks.
The CSI Bank Index and CSI Financials & Real Estate Index are sector indices, with constituent stocks selected only from related industries. For example, the CSI Bank Index is composed of bank stocks from the CSI All Shares Index sample stocks to reflect the overall performance of the banking sector.

1. Different constituent stocks: The SSE 50 Index is composed of the 50 most representative large and liquid stocks in the Shanghai Stock Exchange. The CSI 300 Index consists of the 300 most representative large and liquid stocks in the Shanghai and Shenzhen A-share markets. The CSI 500 Index is composed of the top 500 stocks by total market capitalization after excluding the constituent stocks of the SSE 50 and CSI 300 indices from the A-share market.

2. Different purposes: The SSE 50 Index comprehensively reflects the overall status of a group of leading enterprises with the most market influence in the Shanghai stock market. The CSI 300 Index comprehensively reflects the overall performance of listed stock prices in China's A-share market. The CSI 500 Index comprehensively reflects the stock prices of small and medium-sized companies in the A-share market by market capitalization. Therefore, when selecting individual stocks, investors can first refer to the trends of these indices to understand their overall direction before making trades.

3. Different selection scopes for constituent stocks: The constituent stocks of the CSI 500 Index are selected by excluding the CSI 300 Index stocks and the top 300 stocks by average daily market capitalization over the past year. The remaining stocks are ranked by average daily trading volume from high to low. The constituent stocks of the CSI 300 Index are sorted by the average daily trading value over the past year in the Shanghai and Shenzhen markets from high to low. The constituent stocks of the SSE 50 Index are mainly the 50 largest and most representative stocks by market size in the Shanghai stock market.

The constituent stocks of the CSI 500 Index refer to an index composed of 500 small and medium-sized listed companies by market capitalization in the Shanghai and Shenzhen stock markets.

It features a large number of companies, small individual company market capitalization, and broad industry coverage. After excluding the CSI 300 Index sample stocks and the top 300 stocks by average daily total market capitalization over the past year, the remaining stocks are ranked by average daily trading volume over the past year from high to low. The bottom 20% of stocks are excluded, and the remaining stocks are then ranked by average daily total market capitalization from high to low. The top 500 stocks constitute the sample.