Suspension of trading, also known as "stopping the listing of securities", means that the stock price of a listed company continues to rise or fall for some reason, and the stock exchange suspends the trading of the stock in the market. The main purpose is to protect the rights and interests of investors. After the relevant information is clarified, the company will resume trading again. Reason for suspension:

1. When a listed company publishes important information such as performance reports, dividends, mergers and acquisitions, and changes in equity, it may suspend trading.

2. The securities regulatory authorities believe that listed companies need to clarify and announce matters that have a significant impact on the company.

3. The listed company is put on file for investigation due to violation of regulations, and the suspension time needs to be decided according to the progress of the matter.

The reason why the exchange suspends the trading of listed companies is to solve the problem of asymmetric information of investors. By suspending trading, the abnormal fluctuation of stock price can be prevented, thus protecting the rights and interests of investors. It also highlights the suspension of abnormal warnings such as untimely information disclosure of listed companies, suspected violations of laws and regulations, and stock price changes.