Foreign assets in Hong Kong's Exchange Fund stood at HK$3,399.1 billion at the end of October.
That was down HK$2.4 billion from September, the Hong Kong Monetary Authority noted yesterday.
The monetary base - that comprises certificates of indebtedness, government- issued currency notes and coins in circulation, the balance of the banking system and Exchange Fund bills and notes issued - amounted to HK$1.674 trillion.
Claims on the private sector in Hong Kong amounted to HK$249.9 billion.
And foreign liabilities, representing fees payable to the Exchange Fund's external managers, stood at HK$500 million.