As of the end of August 2024, the Hong Kong Monetary Authority reported that Hong Kong’s official foreign currency reserve assets totaled US$423.4 billion, up from US$419.1 billion at the end of July 2024. Including unsettled foreign exchange contracts, the reserves amounted to US$422.8 billion. These reserves are over five times the currency in circulation and approximately 39% of Hong Kong dollar M3.
Resources: https://www.hkma.gov.hk/eng/news-and-media/press-releases/2024/09/20240906-3/