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Is there a limit on the rise and fall of Hong Kong stocks?
Unlike A-shares, Hong Kong stocks have no limit on price fluctuations. But there is a market regulation mechanism (commonly known as a "cooling off period")
The so-called 'cooling off period' refers to a 5-minute cooling off period when the prices of 81 constituent stocks of the Hang Seng Index and State owned Enterprises Index deviate by more than ± 10% from the last trading price 5 minutes ago. During the cooling off period, buying and selling are allowed within price limits. After the cooling off period, unrestricted normal trading will resume.