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UK software engineer Lewis Barber has filed a reported High Court claim seeking the return of bitcoin he says he lost trading BitMEX derivatives between 2018 and 2022. The claim is valued at £20 million—reported in the headline figure as approximately $27 million—and argues that the contracts were void because BitMEX allegedly offered regulated derivatives in Britain without the required Financial Conduct Authority authorisation. The claim had reportedly been filed but not served on HDR Global Trading Limited, BitMEX’s owner and operator, and no court has ruled on liability.
What the UK lawsuit alleges
The claimant’s theory
Barber’s statement of claim says BitMEX promoted and entered into crypto-derivative transactions with UK customers despite not being authorised by the FCA for the relevant activity. It relies on the Financial Services and Markets Act 2000, arguing that contracts made in breach of the UK authorisation regime are void and that a customer may recover bitcoin lost under them, or receive equivalent damages.
The claim reportedly points to worldwide marketing that did not exclude the UK, including an advertisement in The Times dated 3 January 2019. Barber says his own trading losses occurred from 2018 through 2022.
What he is asking for
The reported value is £20 million. The requested remedy is restitution of the bitcoin allegedly lost on the trades, or a cash award representing its value. That is a claim by one trader, not a court-approved group action or a finding that all BitMEX customers are entitled to repayment.
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BitMEX’s response and the case’s status
A BitMEX spokesperson told The Guardian: “No such claim has been served on HDR Global Trading Limited.” Until service and a formal response, the defendant has not been required to plead its case in the reported proceedings. There is no reported merits judgment, finding that UK law was breached, or decision that the contracts are void.
Why authorisation is central
UK financial-services law generally requires an authorised firm to carry on regulated investment activities in Britain. Barber’s case depends on proving that the particular BitMEX products and the way they were offered to him fell within that regime, that the relevant transactions had a sufficient UK connection, and that the statutory consequences he cites apply to those contracts.
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The March 3, 2020 FCA warning cited in the claim is evidence of a regulatory warning, not a judicial decision about Barber’s trades. It does not by itself establish that every historical BitMEX contract was unlawful or guarantee a refund. A court would still need to examine the products, marketing, customer location, contract terms and trading records.
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Perpetual swaps and other derivatives
The U.S. Commodity Futures Trading Commission’s May 5, 2022 consent order describes BitMEX as a peer-to-peer platform offering cryptocurrency derivatives tied to bitcoin, ether and litecoin. The order records that BitMEX launched its first perpetual bitcoin–U.S. dollar leveraged swap on 13 May 2016. A perpetual swap has no ordinary expiry date and was described as trading similarly to a traditional futures contract.
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Bitcoin margin and liquidation
The CFTC complaint filed on October 1, 2020 says customers deposited bitcoin as margin. When a position’s margin fell below the maintenance-margin level, BitMEX could take over and liquidate the position; the complaint states that the customer’s maintenance margin was lost. Leverage means a relatively small move in the underlying market can consume posted margin quickly, so the amount a trader deposited and the amount ultimately lost are not necessarily the same as the notional value of a contract.
The platform’s reported scale
The same CFTC complaint alleged that BitMEX handled more than 2.5 trillion contracts between 22 November 2014 and 9 February 2020 and had earned more than $1 billion in transaction fees since inception. Those figures describe allegations in the U.S. proceeding, not a measurement of Barber’s losses or a conclusion about the UK claim.
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Key dates
| Date | Event |
|---|---|
| November 2014 | The CFTC complaint says BitMEX launched live trading. |
| 13 May 2016 | The CFTC’s 2022 consent order records the launch of BitMEX’s first perpetual bitcoin–U.S. dollar leveraged swap. |
| 2018–2022 | Barber says the trading losses at issue occurred during this period. |
| 3 January 2019 | The claim cites a BitMEX advertisement published in The Times. |
| 3 March 2020 | The claim cites an FCA warning that BitMEX might have been conducting regulated investment activity in the UK without authorisation. |
| 23 September 2026 | The Guardian reported that BitMEX voluntarily closed after a strategic review. |
| 13 October 2026 | The Guardian reported the £20 million High Court claim; it had not yet been served. |
Can other UK BitMEX traders get their bitcoin back?
Not automatically. Barber’s solicitor, Gareth Keillor of Seladore Legal, said other UK-based people may have entered similar contracts, but whether any individual has a claim will depend on that person’s facts and trading history. Potentially relevant evidence could include:
- When and where the customer lived and traded;
- Which products were used—perpetual swaps, futures, options or another instrument;
- Account agreements, order histories, margin calls and liquidation records;
- Bitcoin deposits, withdrawals and wallet records; and
- Marketing or communications that allegedly targeted the UK.
Those records do not establish entitlement on their own. A solicitor would need to assess authorisation, the contract terms, the legal effect of the Financial Services and Markets Act, causation and any procedural or limitation issues that apply to the individual case. Traders should keep original account exports and correspondence rather than relying only on screenshots.
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What happens next
The immediate procedural question is service. Once a claim is properly served, HDR Global Trading Limited can acknowledge it, file a defence, challenge jurisdiction or seek other case-management orders. The court may then decide preliminary legal questions before any trial on the evidence. Settlement is also possible, but no settlement or hearing outcome has been reported.
The case should therefore be read as a test of one claimant’s legal theory, not as confirmation that all UK BitMEX trades were illegal or that all losses are recoverable. Its wider significance will depend on the pleadings, the defendant’s response and any ruling on whether the products and transactions fell within the UK authorisation rules.
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