Regulations Governing Borrowing or Lending Money in Connection with Securities Business by Securities Firms Article 17

When a securities firm conducts securities business money lending, the total amount of money lending financing that it extends to customers, plus the total amount of the outstanding balance of financing extended to the customer for securities margin purchase and short sales business may not exceed 400 percent of the securities firm's net worth.If a securities firm is concurrently operated by a financial institution, the net worth provisions of the preceding paragraph shall be calculated based on its allocated operating capital; for a branch of a foreign securities firm located within the territory of the Republic of China (ROC), those provisions shall be calculated based on the capital it has specifically allocated for ROC operations.
中文原文 證券商辦理證券業務借貸款項管理辦法第17條
證券商辦理證券業務借貸款項,對客戶融通總金額,加計辦理有價證券買賣融資融券融資總金額,不得超過其淨值百分之四百。
前項規定之淨值,證券商由金融機構兼營者,按指撥營運資金計算,外國證券商在中華民國境內分支機構,按其專撥在中華民國境內營業所用之資金計算。

English translation for reference only; the Chinese text prevails. Not legal advice.