BitMEX Faces $27 Million UK Lawsuit Over 1,053 Losing Trades and Alleged Unauthorized Crypto Derivatives

BitMEX faces a roughly $27 million lawsuit in the United Kingdom over 1,053 losing cryptocurrency derivatives trades, with a British software engineer alleging that the exchange offered regulated financial products without authorization.

Lewis Barber is seeking the return of 324.8 bitcoin, which he says he lost trading on the platform between 2018 and 2022. The claim, filed in London’s High Court, had not been formally served on the defendant as of Oct. 14, 2026, and no court has ruled on its merits. 

The lawsuit names HDR Global Trading Limited, the company that operated BitMEX, a cryptocurrency exchange known for leveraged derivatives trading. The claim values the bitcoin at £20.4 million, or approximately $27.2 million, as of Oct. 1, according to particulars of claim reviewed by The Guardian. A BitMEX spokesperson shared that no claim had been served on the company.

The case comes weeks after BitMEX stopped trading on Sept. 23, following a closure announcement in July. The company said the decision followed a strategic review. Its shutdown adds a practical complication to Barber’s effort to recover the bitcoin, although the availability of assets to satisfy any eventual judgment has not been established.

The Claim Targets 1,053 Losing Trades

Barber says he made approximately 2,294 trades through five accounts on BitMEX between 2018 and 2022. His lawsuit challenges 1,053 trades that lost money. All involved perpetual swaps, derivative contracts that allow traders to speculate on an asset’s price without an expiration date. The claim argues that the contracts constituted regulated financial activity under UK law.

Barber is seeking restitution of the bitcoin he says he lost or equivalent compensation. His lawyers also allege deceit, arguing that BitMEX implicitly represented that it could lawfully offer the trades despite lacking the required authorization. According to the claim, Barber’s solicitors sent a letter in December 2025 seeking to rescind the trades. The trading figures and losses are allegations in the lawsuit, not findings independently established by a court.

The Legal Argument Rests On Uk Financial Law

The claim relies on section 26 of the Financial Services and Markets Act 2000, which governs agreements made by unauthorized persons carrying out regulated activities. The law generally makes such agreements unenforceable against the other party and provides for the recovery of money or property transferred under them, as well as compensation for qualifying losses. Barber argues that his trades fall within those provisions because BitMEX was not authorized to conduct the activity in the United Kingdom. 

The Financial Conduct Authority (FCA), Britain’s financial regulator, published a warning about BitMEX on March 20, 2020, saying the firm might be providing financial services or products in the UK without authorization. The claim also points to promotional activity, including a BitMEX advertisement published in The Times in January 2019, and argues that the exchange did not adequately restrict access by UK users. The FCA warning establishes that the regulator had raised concerns; it does not prove that the disputed contracts were unlawful. The court has yet to determine whether the statutory provisions apply to Barber’s trades. 

Lawyers Say Other Traders Could Pursue Claims

Barber’s legal team has suggested that other UK-based traders may have similar claims against BitMEX. His solicitors have estimated that potential claims could total hundreds of millions of pounds. That figure reflects the claimant’s side’s assessment, not a verified estimate of the company’s liabilities. Any other trader would need to establish a claim based on the individual’s own transactions and circumstances.

A ruling in Barber’s favor could clarify how UK financial-services law applies to offshore cryptocurrency platforms that offer derivatives to UK customers without authorization. But the case remains at an early procedural stage, and its implications will depend on the court’s findings. The legal question is whether the specific trades fall within the law’s restrictions and recovery provisions, not simply whether Barber lost money on a cryptocurrency exchange.

Bitmex Has Faced Separate Us Enforcement And Litigation

In January 2025, HDR Global Trading Limited was sentenced to pay a $100 million fine after pleading guilty to violating the US Bank Secrecy Act. The US Department of Justice said the company had willfully failed to establish, implement and maintain an adequate anti-money-laundering and know-your-customer program. The case concerned US financial-crime compliance obligations and does not resolve the UK lawsuit’s separate allegations about authorization for derivatives trading. 

BitMEX also faces a separate proposed class action in New York involving allegations of bitcoin theft and insider trading linked to liquidations, according to Decrypt. The claims in that case are distinct from Barber’s lawsuit. The company and its co-founders have faced other US legal proceedings, including Bank Secrecy Act cases involving the founders, who pleaded guilty in 2022 and were later pardoned by President Donald Trump in March 2025. Those proceedings do not establish liability in the UK dispute.

BitMEX’s spokesperson has confirmed only that the UK claim had not been served. No substantive response to Barber’s allegations had been reported as of Oct. 14. No hearing date or court timetable has been established in the material reviewed for this article, leaving the next procedural steps unclear.