Securities and Exchange Act Article 45

A securities firm shall operate the securities business within the category to which it belongs under Article 16 and may not operate securities business beyond its own category. However, if it obtains approval from the Competent Authority, this restriction shall not apply.A securities firm shall not be operated concurrently by another enterprise. However, a financial institution with permission from the Competent Authority may concurrently operate a securities business.A securities firm shall not invest in another securities firm except with the approval of the Competent Authority.
中文原文 證券交易法第45條
證券商應依第十六條規定,分別依其種類經營證券業務,不得經營其本身以外之業務。
但經主管機關核准者,不在此限。
證券商不得由他業兼營。
但金融機構得經主管機關之許可,兼營證券業務。
證券商非經主管機關核准,不得投資於其他證券商。

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