From SEC v. Johnson, 2011 U.S. App. LEXIS 13123 (D.C. Cir. June 28, 2011):
Venue for a civil action under the securities laws lies "in the district wherein the defendant is found or is an inhabitant or transacts business," or "in the district wherein any act or transaction constituting the violation occurred." § 78aa. By the reference ...
From SEC v. Johnson, 2011 U.S. App. LEXIS 13123 (D.C. Cir. June 28, 2011):
Venue for a civil action under the securities laws lies “in the district wherein the defendant is found or is an inhabitant or transacts business,” or…