Expert Testimony on Industry Practice

In fact, however, a long line of Second Circuit cases dating back over 20 years have held that expert testimony of the type proffered in Litvak, relating to “ordinary practices in [an] industry,” can be probative of materiality where it “enable[s] the jury to evaluate a defendant's conduct against the standards of accepted practice,” so long as the testimony does not encompass an ultimate legal conclusion. United States v. Bilzerian, 926 F.2d 1285, 1295 (2d Cir. 1991); see also Marx & Co. v. Diners ' Club Inc., 550 F.2d 505, 509 (2d Cir. 1977), cert. denied, 434 U.S. 861, 98 S.Ct. 188, 54 L.Ed.2d 134 (1977) (finding that “[t]estimony concerning the ordinary practices of those engaged in securities business is admissible under the same theory as testimony concerning the ordinary practices of physicians or concerning other trade customs: to enable the jury to evaluate the conduct of the parties against the standards of ordinary practice in the industry.”).

Indeed, courts in virtually every other circuit have reached the same conclusion: Expert testimony regarding industry practice is admissible so long as it does not cross into the realm of legal conclusions. See, e.g., United States v. Offill, 666 F.3d 168, 175 (4th Cir. 2011) (citing Bilzerian , 926 F.2d at 1294 for the proposition that “in complex cases involving the securities industry, expert testimony may help a jury understand unfamiliar terms and concepts”); S.E.C. v. Johnson, 525 F. Supp. 2d 70, 77 (D.D.C. 2007) (“in securities cases, expert testimony commonly is admitted to assist the trier of fact in understanding trading patterns, securities industry practice, securities industry regulations, ' “) (citations omitted); Krys v. Aaron' 112 F. Supp. 3d 181 (D.N.J. 2015) (allowing expert testimony relating to industry practice because it “provides contextual information ' on common customs and practices in the securities industry ' These issues remain plainly relevant and ' may prove infinitely helpful to the jury ' .”) (citations omitted).