ESS Frontier LLC filed a lawsuit on September 4, 2026, in the United States District Court for the Southern District of New York, case number 1:26-cv-07645, against Ostium Foundation, Ostium Labs Co., Deltax LTD., DX Group Limited, Ostium co-founder and CEO Kaledora Kiernan-Linn, and John Doe Transferees 1-10. The nature of the case is an arbitration matter under other statutes, and the cause of action is a petition for an order compelling arbitration and for the appointment of arbitrators pursuant to 9 U.S.C. § 206. The plaintiff also filed a complaint, a motion for a temporary restraining order and preliminary injunction, a motion to file certain materials under seal, and related declarations. Public reports state that the litigation involves approximately $15 million in crypto loans, and that ESS Frontier LLC is suing as the assignee of the creditor Minghui Zheng, a lender in Hong Kong. On September 14 the plaintiff filed a First Amended Complaint and named Minghui Zheng as a co-plaintiff. The court scheduled a hearing for September 17. Ostium is an on-chain perpetual futures protocol deployed on Arbitrum that offers leveraged trading in equities, commodities, foreign exchange, and crypto assets. [ChainCatcher]