A British software engineer has filed a lawsuit in London's Commercial Court seeking the return of 324.8 Bitcoin—valued at roughly $27 million—on the grounds that BitMEX operated unlicensed derivative contracts in the United Kingdom.
Background of the claim
Lewis Barber, the claimant, says he entered more than two-thousand trades on BitMEX between 2018 and 2022 across five accounts. Of those, 1,053 positions resulted in losses. All trades were perpetual swaps, a type of derivative that lacks a fixed expiry date. Barber argues that each transaction required regulatory approval that BitMEX never obtained from the Financial Conduct Authority (FCA), rendering the contracts unenforceable under the Financial Services and Markets Act 2000.
The complaint alleges that BitMEX failed to block UK traffic, allowed users to select the United Kingdom as their residence, and even ran a national advertisement in The Times in January 2019. A March 2020 FCA warning is cited, noting the exchange might have been conducting regulated activities without permission. Barber’s legal team also accuses BitMEX of deceit, claiming the platform implied it could lawfully trade with UK customers while knowing it was not authorised.
The claim has been lodged but not yet formally served on BitMEX’s corporate entity, HDR Global Trading Ltd. A BitMEX spokesperson confirmed that no formal service has occurred.
Legal context and prior enforcement
BitMEX ceased operations on 23 September after announcing a shutdown in July. The exchange had already faced significant regulatory scrutiny. In 2022, co-founders Ben Delo, Arthur Hayes and Samuel Reed pleaded guilty to violations of the U.S. Bank Secrecy Act related to anti-money-laundering failures; they received presidential pardons in March 2025. BitMEX itself entered a guilty plea for the same statute in 2024 and was ordered to pay a $100 million penalty in January 2025.
Separately, the firm is confronting a proposed class action in New York that alleges theft of Bitcoin and insider trading, further compounding its legal exposure.
Potential broader impact
Barber’s counsel warns that other UK participants may hold comparable contracts with BitMEX, suggesting that collective claims could total hundreds of millions of pounds. The firm’s law partner, Gareth Keillor, noted that the viability of additional claims will depend on each trader’s specific history.
If multiple lawsuits proceed, the aggregate liability could pressure BitMEX’s remaining assets and influence how other offshore crypto derivatives platforms manage UK market access.
Why it matters
The case underscores the challenges crypto exchanges face when operating across jurisdictions without clear regulatory clearance. It also highlights the FCA’s ongoing vigilance over unregistered derivative services and may set a precedent for how UK courts treat similar cross-border crypto disputes. For investors, the lawsuit serves as a reminder to verify that any platform offering derivative products is properly authorised in their jurisdiction.
