[Caixin: Hong Kong Monetary Authority Requires Banks to Conduct Account Opening Reviews for Investment Accounts Opened by Mainland Users] According to a report by Caixin, the Hong Kong Monetary Authority (HKMA) has instructed banks to initiate account opening reviews for investment accounts opened by mainland users, focusing on identifying and closing accounts opened with fraudulent documents and clearing out dormant accounts. The review of accounts opened with fraudulent documents will trace back to accounts established from January 2023 onwards, with the review to be completed within three months and problematic accounts to be closed within six months after completion. The review and cleanup of 'dormant accounts' will also be carried out over the next three months. Banks are required to identify cases where investment accounts held by mainland investors had zero balances and no transaction activity for the year leading up to May 22, 2026. These accounts must undergo a renewed KYC (Know Your Customer) information verification process, and customers must make a series of declarations in accordance with the new regulations for opening investment accounts. If the required procedures cannot be completed, the accounts will be closed within six months.