UK Pressed to Act as Polymarket Takes Bets on Bank Failures

UK regulators face calls to act as Polymarket takes $77,500 in bets that HSBC, Lloyds and other major banks will fail by end-2026.

The online prediction market Polymarket has accepted about $77,507 (£58,530) in positions on whether major banks will fail before the end of 2026, with the contracts covering JPMorgan, BNP Paribas and two of Britain's biggest high street lenders, HSBC and Lloyds Banking Group. The offshore, blockchain-based platform bans residents of the UK, US, Canada and the EU from trading, but users across roughly 150 other countries can take part, and reports have documented VPN workarounds that violate the platform's terms. HSBC's collapse was recently priced at around 2% on the platform, per Geo News, so the odds are not signalling imminent trouble. Still, the existence of any market on a major bank's failure has drawn political attention, with Treasury committee member Bobby Dean urging UK regulators to contact their US counterparts.

The striking element is the reflexive loop regulators now fear: a trader bets a bank will fail, the odds jump, screenshots spread on social media, and depositors start wondering whether others know something they do not. The Guardian reports that Liberal Democrat MP Bobby Dean warned such activity could be exploited to aggravate real shifts in market sentiment and could even trigger bank runs if a market escalates rapidly. The concern lands after Silicon Valley Bank and Credit Suisse collapsed in 2023, with withdrawals accelerated by speculation on platforms like X and WhatsApp, and after the Bank of England told lenders to prepare for social media-fuelled runs. Notably, no evidence shows the HSBC or Lloyds contracts have affected depositor behaviour, and a Polymarket price should not be read as evidence either bank is in trouble.

Regulators point to a pattern of insider-trading incidents on prediction markets. The Guardian reports ESMA's September 2026 risk report stated that prediction markets are 'rife with inside trading', citing newly created crypto wallets that reportedly generated about $1.2m in profits shortly before the US-Israel strike on Iran became public in February. It also flagged the case of a US soldier criminally charged over allegedly using classified information to place profitable Polymarket bets ahead of the capture of Venezuela's leader Nicolás Maduro in January, and police being notified in April over suspected tampering with Charles de Gaulle airport weather sensors used to settle Polymarket contracts. The Guardian also reports Polymarket's wallets are publicly traceable but difficult to link to individuals, and the FCA told the paper it has been speaking with international regulators about market integrity.

The amounts wagered are tiny next to the trillions moving through global markets, but the underlying outcome — the failure of a systemically important bank — has direct consequences for depositors and financial stability. Beinsure reports the FCA's 2026 perimeter report identifies prediction markets as an emerging regulatory issue, with sporting or political contracts under the Gambling Commission while financial prediction contracts fall within the FCA's perimeter; the regulator treats the financial products it has reviewed as binary options, which face a permanent ban on retail sales in the UK. Beinsure also reports academics warn of moral hazard, giving participants an incentive to engage in corrupt or dangerous actions to rig a contract's outcome. Polymarket's chief legal officer Neal Kumar rejected criticism, saying the information is already public via credit default swap markets and that prediction markets combat disinformation.

Bobby Dean wants UK regulators to engage directly with US counterparts rather than dismiss a risk that is 'relatively small today', noting how quickly things move in this sector. The FCA has signalled it is already coordinating internationally, and the Bank of England said its supervisors engage regularly with companies on market developments and emerging risks. ESMA is expected to keep pressure on DLT-based platforms operating with limited identity verification. The pressure point for Polymarket is whether bank-failure contracts attract growing volume: Dean's warning is that a rapidly escalating market on a named lender could aggravate sentiment shifts in ways the platform cannot police. For now, HSBC and Lloyds declined to comment and the Treasury did not respond to requests for comment, leaving the regulatory response unresolved heading into the UK budget season.