1. Main board market: It includes four small boards, namely, the main board market of Shanghai Stock Exchange, the main board market of Shenzhen Stock Exchange, the small and medium board market of Shenzhen Stock Exchange and the Growth Enterprise Market of Shenzhen Stock Exchange. Among these four sectors, the main board market of Shanghai Stock Exchange has the largest number of listed companies and the largest market value.

2. New Third Board Market: The listed companies are the most, but the total market value is the lowest;

3. Local equity trading centers (fourth-board market): Every province and city has local equity trading centers, but the transactions are not active and lack market value.

These are the three major sectors of the securities market.

The CSRC divides the securities market into industry sectors.

1. If the income of the securities market in the enterprise business sector exceeds 50%, it can be divided into industry sectors;

2. If an enterprise's operating income in the securities market does not exceed 50%, but a certain business in the enterprise accounts for the highest proportion of operating income, reaching more than 30% of the company's net income in that year, it can be divided into industry sectors;

3. If the above two items are not met, but the securities market needs to be divided into sectors, the marketing department and the State Securities Regulatory Commission need to judge the ownership through the actual operating income. If there are industries with unclear ownership categories, they should be divided into comprehensive industry sectors.