On April 12, 2024, the U.S. Supreme Court issued an important decision in the case of Macquarie Infrastructure Corp. v. Moab Partners, L.P., No. 22-1165. Justice Sotomayor, writing for a unanimous Court, ruled that “pure omissions are not actionable under Rule 10b-5(b).” In other words, a pure omission (i.e., where a speaker says nothing) cannot support a private claim under Section 10(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Rule 10b–5, even if such an omission could constitute a violation of Item 303 of Regulation S-K (“Item 303”).