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佢21號有貨個D叫covered short selling
Hong Kong’s short-selling regime was enhanced after the Asian financial crisis in 1998. Only covered short selling for certain designated securities, as prescribed by the Stock Exchange of Hong Kong Ltd (SEHK), is permitted. Moreover, short selling may be executed only on the SEHK’s trading system at or above the best current asking price (or the tick rule).
The rules also require a full audit trail to be kept for covered short sales, meaning, for instance, that when clients place short selling orders, they must provide documentary confirmation to their brokers or agents that the sale is shorted and it is covered. Breaches of these statutory requirements may result in criminal prosecution.