The Commissioner may require by rule or order: A minimum capital for a registered broker-dealer, subject to the limitations of § 15 of the Securities Exchange Act of 1934; and Minimum financial requirements for an investment adviser, subject to the limitations of § 222 of the Investment Advisers Act of 1940. These financial requirements may include different requirements for those investment advisers who maintain custody of clients’ funds or securities, or who require payment more than 6 months in advance of fees in excess of $500, and those investment advisers who do not.