Yesterday, the market opened 48 points lower, the index fluctuated downwards and rebounded in the late session. The highest hit 3648 points, and the lowest fell by 3549 points to close at 3622 points, down by 40 points, or1.1%. Today, the market opened lower at 1 point, and the index fluctuated upward, with the highest at 3757 points and the lowest at 360 1 point, closing at 3756 points and rising at 133 points.

1. What is the Shanghai Composite Index?

The Shanghai Composite Index is referred to as "Shanghai Composite Index" or "Shanghai Composite Index" for short, and its sample shares are all listed on the Shanghai Stock Exchange, including A shares and B shares, reflecting the price changes of listed stocks on the Shanghai Stock Exchange. The three major stock indexes in Shenzhen, which took the lead in the callback last trading day, fell more than 3% simultaneously. Adapting to the development pattern of Shanghai stock market, Shanghai composite index, Shanghai 50 index, Shanghai 180 index and Shanghai 380 index, the Shanghai index system with Shanghai bond, corporate bond and Shanghai fund index as the core scientifically depicts the market structure and change characteristics of Shanghai stock market with rich levels, wide industries and expanded varieties, which is conducive to multi-dimensional analysis of market participants, improving the visibility of sample enterprises and guiding the rational allocation of market funds.

Second, the calculation method of Shanghai Composite Index

1. The Shanghai Composite Index is weighted by the number of issued share capital of sample stocks, and the calculation formula is: reporting period index = (total market value of constituent stocks in the reporting period/base period) base period index; Among them, the total market value = (the number of shares issued at the stock price). When calculating the Shanghai B-share index, the B-share prices in the constituent stocks are calculated in US dollars. When calculating the patient index, the B-share prices of constituent stocks are converted into RMB at the applicable exchange rate (the central parity of RMB against the US dollar on the last trading day of each week in China Foreign Exchange Trading Center).

2. The government bond index of Shanghai Stock Exchange takes the stock exchange's national debt issuance as the weight, and the calculation formula is: reporting period index = (total market value of national debt in the reporting period, debt interest and reinvestment income in the reporting period)/base period 100. Among them, the total market value = (full price circulation); Full price = net price of accrued interest.

A large number of industry, theme, style and strategy indexes derived from the Shanghai Stock Exchange index system provide more and more professional trading varieties and investment methods for the market, and improve the liquidity and effectiveness of the market. The Shanghai Composite Index is the earliest published index, which is a weighted comprehensive stock price index with all stocks listed on the Shanghai Stock Exchange as the calculation range and circulation as the weight.