The Southern District Court of New York rejected the preliminary injunction motion against Susquehanna for insider trading

On September 14, 2026, Judge Arun Subramanian of the United States District Court for the Southern District of New York issued an opinion and order denying the plaintiff's motion for a preliminary injunction. The case number is 1:26-cv-05474-AS, with the plaintiffs being market makers Susquehanna Securities, LLC and Susquehanna Investment Group, and the intervenor being market maker Citadel Securities LLC, while the defendants are John Does 1 through 100. The plaintiffs filed the lawsuit on June 29, 2026, claiming violations under Section 20A of the Securities Exchange Act of 1934 and unjust enrichment claims.

The plaintiffs allege that the defendants traded on significant non-public information, specifically an announcement on May 22, 2026, regarding "the Chinese government's crackdown on cross-border trading platforms," which led to a collapse of the relevant securities. The plaintiffs sought a preliminary injunction to restrict the 40 defendants, as reduced, from transferring, encumbering, removing, or otherwise disposing of the profits obtained through the alleged insider trading activities in their accounts at third-party brokerage firms, or sought a seizure order. The court found that the plaintiffs failed to demonstrate the elements necessary to prove that they may suffer irreparable harm, and the motion was denied.