Did BitMEX trade against its own clients?

Two former customers accuse BitMEX of running an internal trading desk that had access to confidential customer information and was able to keep trading during platform outages. Together they say they lost 622.66 BTC to forced liquidations. BitMEX calls the case baseless. What exactly has been alleged, what has been proven, and why does this touch on a fundamental risk of centralised crypto exchanges?

Status: this article describes allegations from a civil complaint. The court has not yet established that BitMEX carried out the alleged conduct.

The core of the complaint

BKX Services Inc. and David Namdar filed a proposed class action on 23 July 2026 with the US District Court for the Southern District of New York. According to the complaint, BKX lost at least 305.81 BTC and Namdar more than 316.85 BTC. Together they are seeking, among other things, the return of 622.66 BTC.

The allegations go further than a dispute about a faulty liquidation engine. The plaintiffs allege that BitMEX operated a non-public internal trading desk that:

had access to information about customer positions, orders and liquidation levels;
was able to trade against users of the platform;
retained access to the market during server freezes while customers could not close their positions;
benefited from liquidations because remaining collateral ended up in the insurance fund.

Those are allegations by the plaintiffs, not established facts.

Why “trading against clients” is so serious

An exchange does not only run the technical marketplace. The platform also sees orders before they are executed, knows customers' margin positions and sets the rules of the liquidation engine. If an affiliated trading desk were able to use that information or those infrastructure advantages, a fundamental conflict of interest arises.

The problem is not that a market maker makes a profit when a customer loses. Market makers take the other side of trades precisely in order to provide liquidity. The problem arises when one party at the same time:

sets the market rules;
holds non-public customer information;
controls access to the trading platform;
and trades on its own account against those customers.

Under MiCA, operators of a crypto trading platform may not deal on own account on the platform they operate themselves. Matched-principal trading is permitted only subject to conditions. In addition, providers must identify, prevent, manage and disclose conflicts of interest.

The role of server freezes

An outage during extreme volatility can occur on any trading platform. The crucial question is whether all participants are treated equally at that moment.

The complaint alleges that during certain freezes ordinary users could not amend orders or close positions, while an internal desk was able to stay active. If that were to be proven, it would not be only a matter of poor uptime. It would then amount to asymmetric market access at precisely the moment customers were most vulnerable.

At the time, BitMEX attributed outages to technical problems and DDoS attacks, among other causes. The plaintiffs dispute that explanation. That conflict has to be assessed on the evidence and ultimately by the court.

Liquidation and the insurance fund

With a leveraged position, an exchange can step in before the entire collateral has been wiped out. That protects the market against a negative balance. The difference between the price at which a position is liquidated and the eventual execution can end up in an insurance fund.

Such a fund is normal in itself. It becomes problematic if the operator were to have a financial incentive to cause liquidations or to execute them unfavourably. The plaintiffs allege that BitMEX profited from this mechanism; BitMEX disputes the basis of the case.

What does BitMEX say?

BitMEX told Cointelegraph that it has faced comparable claims before in its history and has always resolved them successfully. The exchange calls this case opportunistic and baseless as well, and says it will defend itself vigorously.

That response is emphatically part of the story. A civil complaint contains the plaintiffs' version and is not evidence that every allegation is correct.

What traders can learn from this

When assessing a derivatives exchange, fees and spreads are not enough. Traders should also be able to find out:

whether the exchange or an affiliated entity deals on own account;
which parties retain access to the matching engine during outages;
how liquidation prices and bankruptcy prices are determined;
who benefits economically from the insurance fund;
whether independent market makers are given access on equal terms;
which incident reports and historical uptime data are available;
under which licence and with which legal entity the customer is trading.

ExchangeFacts Verdict

The BitMEX case touches on the core question of market integrity: is the exchange only the referee, or might it also be playing? As long as the court has not ruled, the allegations may not be presented as facts. But the alleged combination of internal trading, an information advantage and unequal access during freezes is serious enough to be examined explicitly in every exchange assessment.

Sources

Compare exchanges on more than just feesView the comparisons