Under Hong Kong's pegged currency regime the Hong Kong Monetary Authority (HKMA) is obliged to step into the market if the currency breaks 7.8 and buy Hong Kong dollars for US dollars to defend the peg.
The Hong Kong dollar spot rate was quoted at 7.7999/80 in late trade, unchanged from late on Friday.
"There was not much business today," said a trader. "The market is waiting for some figures from the US I think a tight range will persist."