A legal dispute in the United Kingdom is calling into question the legality of certain crypto derivatives transactions. A British engineer claims 324.8 bitcoins, valued at around $26.5 million as of October 14, 2026, after more than a thousand loss-making transactions. He believes that the platform did not have the necessary authorization to offer these financial products to British customers. This case could also concern other traders who carried out similar operations between 2018 and 2022 on the BitMEX platform.
In brief
- A British trader claims 324.8 BTC, or approximately $26.5 million, from BitMEX.
- His complaint relates to 1,053 loss-making transactions carried out between 2018 and 2022.
- It accuses the platform of offering crypto derivatives without regulatory authorization in the United Kingdom.
- BitMEX disputes the significance of the complaint, while the outcome of the case may be of interest to other UK traders.
UK trader claims 324.8 BTC after four years of losses
Lewis Barber, a computer engineer from Chelford, Cheshire, is understood to have brought proceedings at the High Court in London. It targets HDR Global Trading Limited, the Seychelles-registered company that owns BitMEX. According to information reported by The Guardian And The Mirrorhe contests the legality of his derivatives transactions carried out between 2018 and 2022.
During this period, the trader allegedly used five accounts to make approximately 2,294 trades. However, its reimbursement request only concerns 1,053 operations that resulted in losses. All concerned perpetual swaps, contracts which allow speculation on the prices of cryptocurrencies without a fixed deadline. These instruments occupy an important place in the crypto derivatives market.
The amount claimed reaches 324.8 BTC, or approximately $26.5 million based on the valuation indicated as of October 14, 2026. Lewis Barber is seeking to recover his original bitcoins or receive equivalent damages. Its approach is therefore not simply aimed at contesting the results of its investments. She is seeking to establish whether the platform could legally offer her these financial products in the United Kingdom.
BitMEX faces UK financial rules and FCA warning
At the heart of the file is the UK Act 2000 on financial services and markets, known by the acronym FSMA. Lewis Barber claims that the platform carried out regulated financial activities without having the necessary authorization from the Financial Conduct Authority (FCA). According to his argument, this lack of authorization could make the contested contracts unenforceable against him.
His lawyers also advance several grounds, including deception, negligent misrepresentation and mistake. They believe that the company presented itself as legally authorized to offer these operations. To support this position, they recall that the FCA had published a warning on March 3, 2020. The British regulator then indicated that the platform was operating without authorization and targeting consumers in the country.
The complaint also mentions international advertising campaigns, including an ad published in the newspaper The Times in January 2019. In December 2025, representatives of Lewis Barber, of the Seladore Legal firm, had already requested the cancellation of the transactions concerned. Gareth Keillor, a partner at the firm, also pointed out that other UK traders may have entered into similar deals. However, their possibility of obtaining compensation will depend on their situation and the circumstances specific to each case.
A contested procedure and possible consequences for traders
Despite the filing of the complaint, one procedural point remains important: the procedure had not yet been officially notified to the target company. A BitMEX spokesperson told Daniel Boffey, editor-in-chief of the Guardianthat no complaint of this nature had been served on HDR Global Trading Limited. This statement, however, does not resolve the substance of the legal dispute.
The case comes after the cessation of BitMEX trading activities, announced for September 23, 2026 as part of a strategic review and orderly liquidation. Withdrawals of funds nevertheless remained possible. Founded in 2014 by Arthur Hayes, Ben Delo and Samuel Reed, the company helped popularize perpetual swaps before running into regulatory difficulties in the United States.
At this point, Lewis Barber’s charges remain to be reviewed and no court date has been announced. The High Court’s decision could clarify the consequences of the lack of regulatory authorization for certain financial contracts offered to UK customers.
If the court accepts the interpretation defended by the plaintiff, other traders could consider similar steps. Otherwise, their possibilities of recourse will depend in particular on the legal grounds chosen and the facts specific to each situation.
The dispute between Lewis Barber and BitMEX thus opens a central question for the British cryptocurrency market: can losses from old transactions give rise to restitution when the legality of the contracts is contested? The answer will depend on the judicial review, which will have to determine the scope of the applicable financial rules and the possible responsibilities of the platform.
Maximize your Tremplin.io experience with our ‘Read to Earn’ program! For every article you read, earn points and access exclusive rewards. Sign up now and start earning benefits.
