SZSE Component Index is the main stock index of Shenzhen Stock Exchange. It selects 40 representative listed companies as constituent stocks according to certain standards, and uses a comprehensive method to compile the stock price index with the number of circulating stocks as the weight. Starting from 1 May 9951,the base number is 1000 points. Its basic formula is:

Stock price index = total market value of current constituent stocks/total market value of basic constituent stocks × 1000.

The calculation method is as follows: 40 stocks of listed companies with market representativeness are selected from all the stocks listed in Shenzhen Stock Exchange as samples, and the weighted average method is used to calculate the shares with the benchmark date of1July 20, 1994, and the benchmark index is set to 1000 points.

introduce

In order to ensure the objectivity and fairness of the sample of constituent stocks, constituent stocks do not engage in tenure. The Shenzhen Stock Exchange regularly checks the representativeness of constituent stocks, promptly replaces companies with reduced representativeness, and selects more representative companies. Of course, the change will not be too frequent, and the inspection time is 1 month, May and September every year.

According to the basic principle of adjusting constituent stocks and referring to international practice, Shenzhen Stock Exchange has formulated scientific standards and a method of selecting constituent stock samples step by step, that is, the shortlisted companies are determined from all listed companies according to the primary selection criteria, and then the selected constituent stock samples are determined from the shortlisted companies.

1. Confirm the shortlisted companies. The criteria for determining the shortlisted companies include three requirements: time to market, market size and liquidity:

(1) has a certain listing date, which should generally be more than 3 months.

(2) It has a certain listing scale. The market value of listed companies accounts for the market proportion (3-month average) in descending order, and the shortlisted companies are among the 90%.

(3) Having certain market liquidity. The transaction amount of listed companies in the market share (3-month average) is arranged and accumulated in descending order, and the shortlisted companies are among 90%.

2. Determine the sample of constituent stocks. After the shortlisted companies are determined according to the above criteria, the selected sample of constituent stocks is determined by combining the following factors:

(1) circulating market value and turnover of the company;

(2) the industry representativeness of the company and its growth;

(3) the company's financial status and operating performance (review of the past three years);

(4) Standardized operation of the company within two years. By giving scientific weight to the above factors and quantifying them, the sample of constituent stocks in various industries is selected.