Global banking giants Standard Chartered and HSBC were among banks that shut branches in Hong Kong as mass pro-democracy protests gripped several parts of the city.
Bank of East Asia, Bank of China Hong Kong and China CITIC Bank International also said their operations were affected by the protests.
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Standard Chartered, said it had activated contingency plans continue providing a service to customers.
According to the Hong Kong Monetary Authority (HKMA) nearly 44 branches, offices and automated teller machines (ATMs) were closed on 29 September 2014.
The HKMA said it would "inject liquidity" into the banking system "as and when necessary" and monitor the stability of the Hong Kong dollar exchange rate after the currency fell to a six-month low against the US dollar.
Thousands of protesters descended on Hong Kong to campaign for the Chinese government to grant full democratic powers to the area.
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By GlobalData
