The U.S. Supreme Court recently held that the anti-fraud provision of the Securities Exchange Act does not prohibit “pure omissions,” but only false statements or misleading half-truths.  The unanimous decision in Macquarie Infrastructure Corp. v. Moab Partners, L.P. (April 12, 2024) holds that § 10(b) of the Exchange Act and the SEC’s Rule 10b-5(b) require a statement that is false or misleading.  A pure omission that does not render a statement false or misleading is not actionable, at least in private actions.