17 CFR 240.15c1-2: c1-2 Fraud and misrepresentation.

(a) The term manipulative, deceptive, or other fraudulent device or contrivance, as used in section 15(c)(1) of the Act (section 2, 52 Stat. 1075; 15 U.S.C. 78o(c)(1), is hereby defined to include any act, practice, or course of business which operates or would operate as a fraud or deceit upon any person.

(b) The term manipulative, deceptive, or other fraudulent device or contrivance, as used in section 15(c)(1) of the Act, is hereby defined to include any untrue statement of a material fact and any omission to state a material fact necessary in order to make the statements made, in the light of the circumstances under which they are made, not misleading, which statement or omission is made with knowledge or reasonable grounds to believe that it is untrue or misleading.

(c) The scope of this section shall not be limited by any specific definitions of the term “manipulative, deceptive, or other fraudulent device or contrivance” contained in other rules adopted pursuant to section 15(c)(1) of the act.