BKX Services Inc. and David Namdar have sued BitMEX in the U.S. District Court for the Southern District of New York, alleging they lost a combined 622.66 BTC through forced liquidations and that the exchange’s system was designed to retain customer collateral. The complaint says BitMEX’s internal trading desk could access non-public customer information and continue trading during server outages, raising questions about customer asset handling, internal information barriers, and risk controls during market stress. The plaintiffs seek the return of the bitcoin plus compensatory and punitive damages, and aim to represent U.S. customers who traded Bitcoin perpetual swaps dating back to July 23, 2018. Separately, HDR Global Trading has said BitMEX will wind down its exchange business, with trading ending at 04:00 UTC on Sept. 23.