There is no limit to the variety of Hong Kong stock trading, but there is a fluctuation adjustment mechanism in the Hong Kong stock market. Under this mechanism, once the stock price in the range exceeds the fluctuation limit of the last transaction price five minutes ago, it will trigger the market adjustment mechanism and immediately start a five-minute cooling-off period. The specific fluctuation limits are as follows:

Note: During the cooling-off period, market-regulated securities will be declared within the allowed price range; After the cooling-off period is over, the securities that trigger the market regulation mechanism will enter normal trading, and will not be restricted by the fluctuation of the market regulation mechanism.