17 C.F.R. § 240.3a40-1
The term financial responsibility rules for purposes of the Securities Investor Protection Act of 1970 shall include:
(d) Any other rule adopted by the Commission or any self-regulatory organization relating to the protection of funds or securities.
(Secs. 3, 15(c)(3), 17(a) and 23 (15 U.S.C. 78c, 78o, 78q(a) and 78u))
[44 FR 28318, May 15, 1979]