BitMEX's operator faces a £20m High Court claim that unapproved UK derivatives contracts are void
Lewis Barber has filed a £20m High Court claim against BitMEX's operator, arguing UK crypto derivatives sold without FCA approval are void. His lawyers say thousands of non-professional UK investors may have lost money the same way, but the claim has not been served.
The Board Room · Leadership desk

Timeline: 3 January 2019, BitMEX advert in the Times, per Barber's statement of claim; around 3 March 2020, FCA warning, which falls inside the 2018 to 2022 period of Barber's alleged losses; 23 September 2026, BitMEX closes voluntarily after what it called a strategic review.
| Date | Event | Claim |
|---|---|---|
| January 3, 2019 | Statement of claim cites a BitMEX advert in the Times | 7 |
| March 2020 | FCA warning falls inside Barber's 2018 to 2022 loss period | 16 |
| September 23, 2026 | BitMEX closes voluntarily after what it calls a strategic review | 10 |
What happened
- Barber says he lost bitcoin worth £20m between 2018 and 2022 trading derivatives that amplified gains or losses with the price of the cryptocurrency.
- His statement of claim says BitMEX placed at least one advertisement in the Times, published on 3 January 2019, to promote itself.
- BitMEX closed voluntarily on 23 September 2026 after what it described as a strategic review of the business.
- Separately, BitMEX pleaded guilty in 2024 to Bank Secrecy Act violations and in January 2025 was required to pay $100m to the US Department of Justice.
Why it matters
- exposure BitMEX's exposure depends on how many UK investors come forward and what each lost. Barber's £20m is the floor of his lawyers' estimate.
- constraint A win for Barber would not settle every other UK trader's position, because each would still have to show his own trading history.
- decision A platform deciding whether to exclude the UK from its campaigns now has a pleaded example of what non-exclusion is alleged to cost.
Everything else in the dispute follows from one short theory. Barber's claim contends that under the Financial Services and Markets Act 2000 the "contracts are void and that consumers are entitled to restitution of any bitcoin lost on those trades" [4]. On that reading the case turns on whether BitMEX needed FCA approval and lacked it [5]. Barber seeks the return of all the bitcoin he lost, or damages for trades going back a number of years [8].
Marketing is what brings the claim to the UK. The statement of claim says BitMEX "conducted promotional campaigns on a worldwide basis and did not exclude the United Kingdom from their reach" [6]. In our view that is the passage other platforms should read first, since it ties UK exposure to where advertising landed. BitMEX is a Seychelles-based company [12].
Barber's pleading also leans on the regulator. It says the FCA issued a warning on or around 3 March 2020 that the defendant may have been conducting trading in regulated investments in the UK without authorisation [9]. That date sits inside the 2018 to 2022 period of Barber's losses [3], so some of the trades he complains of came before the warning and some after [16].
Calling the case a template is the claimants' framing. Their own lawyer limits it. Gareth Keillor, a partner at Seladore Legal, the firm representing Barber, said: "The proceedings may also have wider relevance. Other UK-based persons may have entered into similar contracts with BitMEX, although whether any individual has a claim will depend on the particular facts and trading history." [18] A win for Barber would help other investors only to the extent their facts matched his.
Their estimate of the bill is conditional as well. Barber's lawyers say that if he succeeds, the bill for BitMEX could run into hundreds of millions of pounds [19]. Taking £200m as the floor of "hundreds of millions", that is at least ten times Barber's own £20m [15]. It would take ten claimants with losses his size, or more claimants with smaller ones.
This week the story is a pleading that the defendant says it has not received. A BitMEX spokesperson said: "No such claim has been served on HDR Global Trading Limited." [13] The statement addresses service only. With the exchange shut, the report does not say what assets HDR Global Trading holds, so whether a judgment could be collected is open.
What to watch
- Service of the claim on HDR Global Trading and its defence, which would show whether BitMEX contests the voidness argument or only the procedure.
- A second UK investor filing on the same Financial Services and Markets Act ground, the first evidence that the theory travels beyond Barber.
- Any disclosure of what assets HDR Global Trading holds after the exchange's closure.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence55
- Adoption
- Insufficient
- Hype gap+15
- Incentives50
- Confidence68
Perspective Coverage
6 publishers- Builder
- Builder 12%
- Operator
- Operator 44%
- Investor
- Investor 44%
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Lewis Barber, a software engineer, is suing for £20m over claims that the company mis-sold financial products in the UK; the claim was filed at the High Court.
- [2]
The claim is against HDR Global Trading Limited, the owner and operator of the BitMEX cryptocurrency derivatives exchange, which has been shut down.
- [3]
Barber claims he lost bitcoin between 2018 and 2022 to the value of £20m trading derivatives offered by BitMEX, which amplified gains or losses depending on the changing value of the cryptocurrency.
- [4]
The claim contends that under the Financial Services and Markets Act 2000 such contracts are void and that consumers are entitled to restitution of any bitcoin lost on those trades.
- [5]
Barber alleges that BitMEX offered crypto derivative products to investors in the UK despite not being regulated or approved to do so by the Financial Conduct Authority.
- [6]
Barber's statement of claim says BitMEX "conducted promotional campaigns on a worldwide basis and did not exclude the United Kingdom from their reach".
- [7]
The statement of claim says: "The Defendant placed at least one advertisement in the Times (published on 3 January 2019) which promoted the Defendant".
- [8]
Barber seeks the return of all bitcoin he lost in trading with BitMEX, or damages for trades going back a number of years.
- [9]
The claim says: "On or around 3 March 2020, the FCA issued a warning that the Defendant may have been conducting trading in regulated investments in the United Kingdom without FCA authorisation."
- [10]
BitMEX closed voluntarily on 23 September 2026, after what it described as a strategic review of the business.
- [11]
In 2024 BitMEX pleaded guilty to Bank Secrecy Act violations for failing to maintain adequate anti-money-laundering and know-your-customer programmes, and in January 2025 was required to pay $100m to the US Department of Justice.
- [12]
BitMEX is a Seychelles-based company.
- [13]
A BitMEX spokesperson said: "No such claim has been served on HDR Global Trading Limited."
- [14]
The claim was filed at the High Court but has not yet been served on BitMEX.
- [15]
Taking £200m as the lower bound of 'hundreds of millions', the lawyers' estimated bill is at least ten times Barber's own £20m claim.
- [16]
The FCA warning dated around 3 March 2020 falls inside the 2018 to 2022 period of Barber's alleged losses, so some of the trades preceded it and some followed it.
- [17]
Barber's lawyers allege he may be one of thousands of non-professional investors in the UK who sustained heavy losses after being sold derivative products by BitMEX in breach of FCA rules and consumer protection laws.
- [18]
Gareth Keillor, a partner at Seladore Legal, which represents Barber, said: "The proceedings may also have wider relevance. Other UK-based persons may have entered into similar contracts with BitMEX, although whether any individual has a claim will depend on the particular facts and trading history."
- [19]
Should Barber succeed, the bill for BitMEX could run into hundreds of millions of pounds, according to his lawyers.
Get this ledger inside ChatGPT. Ask about any of our stories and the answer brings its figure, each claim’s verdict and the sources. Free, no account.
Sources
6 independent publishers whose own reporting we read for this story.
- crypto.newsBitMEX sued for £20 million over Bitcoin losses
1 article · October 14, 2026
- cryptobriefing.comBitMEX sued in UK for $27 million in Bitcoin over unlicensed derivatives
1 article · October 14, 2026
- cryptopolitan.comUK trader sues BitMEX for return of $27M in bitcoin over unlicensed derivatives
1 article · October 14, 2026
- decrypt.coBitMEX Sued in UK for Return of $27M in Bitcoin Over Unlicensed Derivatives
1 article · October 14, 2026
- news.bitcoin.comBitmex Faces $26 Million Claim Over 1,053 Losing Bitcoin Trades
1 article · October 14, 2026
- theguardian.comCryptocurrency exchange founded by Reform donor Ben Delo sued for £20m
1 article · October 13, 2026
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