The Shanghai Stock Exchange and Shenzhen Stock Exchange set the time from 9:15 to 9:25 in the morning. A large amount of information about buying or selling a certain stock is input into the computer, but at this time the computer only accepts the information and does not match the information. The computer started working just before the official opening of the market (9:30). A dozen seconds later, the computer matched the price and generated the opening price of the stock that day based on the price determined first with the largest trading volume, which was reflected on the screen in a timely manner. , this method is called call auction (there is no call auction when the market opens in the afternoon).

The call auction can reflect whether the stock is active. If it is an active stock, the price generated by the call auction is generally higher than the previous day, indicating that there are active sellers and the stock has a downward trend. If the stock is an inactive or unpopular stock, the price generated through call auction is generally lower than the previous day, there are fewer sales, and the stock has an upward trend.

Specifically, collective bidding is a collection of several entrusted quotations or all entrusted quotations within a period of time, and generates a price based on the principle of not being higher than the bid price and not being lower than the bid price. The transaction price is the maximum number of stocks traded at this price, and this price is used as the transaction price for all transaction orders.

The so-called call auction means that when there is no transaction price on the day, you can enter the stock price based on the previous day's closing price and the prediction of the day's stock market, and during this period, enter all the information on the computer host. The prices are all equal. There is no need to trade according to the principles of time priority and price priority. Instead, the price of the stock is determined according to the principle of maximum trading volume. This price is called the call auction price, and this process is called Call bidding. Until after 9:25, you can see the transaction prices and quantities of various stock call auctions on the securities company's market. Sometimes a certain stock cannot be traded because the price given by the buyer is lower than the price given by the seller. Then, the column of the transaction price of the stock on the market after 9:25 will be empty. Of course, sometimes some companies stop trading for a period of time because they want to release news or convene a shareholders' meeting, so the transaction price column of the company's stocks during the call auction is also empty. Because the call auction is based on the maximum trading volume, for ordinary investors, as long as the price of the entered stock is higher than the actual transaction price during the call auction time, the transaction can be completed. Therefore, you can usually set the price higher without any danger. Because the number of shares purchased by ordinary investors will not be very large, it will not affect the call auction price of the stock. However, you must have sufficient funds on your fund card at this time.