17 C.F.R. § 227.300
(a) Requirements. A person acting as an intermediary in a transaction involving the offer or sale of securities in reliance on section 4(a)(6) of the Securities Act (15 U.S.C. 77d(a)(6)) must:
(b) Financial interests. Any director, officer or partner of an intermediary, or any person occupying a similar status or performing a similar function, may not have a financial interest in an issuer that is offering or selling securities in reliance on section 4(a)(6) of the Securities Act (15 U.S.C. 77d(a)(6)) through the intermediary's platform, or receive a financial interest in an issuer as compensation for the services provided to or for the benefit of the issuer in connection with the offer or sale of such securities. An intermediary may not have a financial interest in an issuer that is offering or selling securities in reliance on section 4(a)(6) of the Securities Act (15 U.S.C. 77d(a)(6)) through the intermediary's platform unless:
(c) Definitions. For purposes of this part:
(2) Funding portal means a broker acting as an intermediary in a transaction involving the offer or sale of securities in reliance on section 4(a)(6) of the Securities Act (15 U.S.C. 77d(a)(6)), that does not:
(4) Platform means a program or application accessible via the Internet or other similar electronic communication medium through which a registered broker or a registered funding portal acts as an intermediary in a transaction involving the offer or sale of securities in reliance on section 4(a)(6) of the Securities Act (15 U.S.C. 77d(a)(6)).
Instruction to paragraph (c)(4). An intermediary through which a crowdfunding transaction is conducted may engage in back office or other administrative functions other than on the intermediary's platform.