Stock Knowledge: What Is Stock Index?

1. definition of stock index

Stock index is

2. calculation method of stock index

1. the calculation of stock price average (1) simple arithmetic stock price average (2) corrected stock average (3) weighted stock price average.

2. calculation of stock index (1) relative law (2) comprehensive method (3) weighting method

3. several famous stock indexes

One

4. China's stock index

1. Shanghai Composite Index

The stock index compiled by the Shanghai stock exchange was officially launched in December 19, 1990.

The sample of the stock index is all stocks listed on the Shanghai stock exchange, where the newly listed stocks are included in the stock index within second days of listing.

The weight of the stock index is the total share capital of the listed company.

Because the shares of Listed Companies in China are divided into tradable shares and non tradable shares, the flux is not consistent with the total capital stock. Therefore, the larger share capital has a greater impact on the stock index. Shanghai stock index often becomes a tool for large institutional investors to make the stock market deviate from the rise and fall of most stocks.

The issuance of stock index of Shanghai stock exchange is almost synchronous with the change of stock market. It is an essential reference for Chinese stock holders and securities practitioners to judge the trend of stock price change.

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2. Shenzhen composite stock index

The stock index compiled by the Shenzhen stock exchange is the base period in April 3, 1991.

The calculation method of the stock index is basically the same as that of the Shanghai Composite Index. The sample is all the stocks listed on the Shenzhen stock exchange, and the weights are the total share capital of the stock.

As a sample of all listed companies, their representativeness is very extensive, and it is released synchronously with the stock market in Shenzhen. It is an essential reference for investors and securities practitioners to judge the trend of stock price in Shenzhen stock market.

In the past few years, the stock exchange of Shenzhen securities was not as active as the Shanghai stock exchange. The Shenzhen stock exchange has changed the method of compiling the stock index, using the constituent stock index, of which only 40 stocks were selected and released in May 1995.

Now the Shenzhen stock exchange coexists two stock indexes, one is the old index Shenzhen composite index, the other is the constituent stock index. But judging from the recent three years' running situation, the difference between the two indexes is not particularly obvious.

Shanghai 180 Index

The Shanghai Stock Exchange officially released the Shanghai Stock Exchange 180 Index in July 1st, which is used to replace the previous Shanghai Stock Exchange 30 index.

The sample size of the newly compiled Shanghai 180 index has expanded to 180. The selected stocks are large, mobile and representative industries.

This index has not only made breakthroughs in the scientificalness of the compilation method, the representativeness of component selection and the openness of the components, but also restored and improved the market representativeness of the constituent index, thus reflecting the trend of stock prices more comprehensively.

Statistics show that the Shanghai 180 Index's circulation market value accounts for 50% of the Shanghai stock market's circulation market value, and the turnover accounts for 47%.

Its launch will help to promote indexation investment, guide investors to invest rationally and promote market concern for blue chips.

The CSI 300 index is a constituent stock index compiled by 300 A shares in the stock market of Shanghai and Shenzhen.

The Shanghai and Shenzhen 300 index covers the market value of about 60% of the Shanghai and Shenzhen stock market, and has a good market representation.

The Shanghai and Shenzhen 300 index is the first joint index issued by the Shanghai and Shenzhen Stock Exchange to reflect the overall trend of the A share market.

Its introduction enriches the existing index system in the market, adds an index to observe the market trend, helps investors grasp the market operation situation comprehensively, and further provides the basic conditions for the innovation and development of index investment products.

5. stock index and investment return

The stock index is a positive proportion function of the market value of the index portfolio, and its rise and fall is the yield of this portfolio.

However, in the calculation of stock index, the paction cost of stock is not deducted, so the actual income of shareholders will be smaller than the rise and fall of stock index.

A maxim frequently circulated in the stock market is called "oxen bear bear". That is to say, the stock market is profitable and bear a loss in the bull market. But if the investors are analyzed as an investment group, investors in the bull market may not be able to make profits.