UK Officials Urged to Act Over Polymarket Bets on HSBC, Lloyds Failing

What the markets show

Polymarket, an online platform where users trade contracts on the outcome of real-world events, has listed markets asking whether major banks will fail before the end of 2026, including HSBC, Lloyds, JPMorgan Chase and BNP Paribas. Combined positions on these banks have reached roughly $77,507, or £58,530, according to figures reported by The Guardian on October 3, 2026 and reproduced by AOL and Finwire the same day.

Separately, Bloomberg reported on September 25, 2026 that Polymarket's offshore platform had recorded $591,000 in volume on contracts asking whether major banks would fail by July 2026, and $76,000 on contracts covering failures by the end of 2026. The report, republished by Yahoo Finance UK, named JPMorgan Chase, Bank of America, Wells Fargo and Deutsche Bank among the lenders drawing scrutiny, without specifying how the volume split between individual banks.

Who is raising the alarm

Bobby Dean, a Liberal Democrat MP who sits on the Treasury Committee, told The Guardian that the structure of the bets made them vulnerable to abuse.

Dean said escalating bank-related betting "could even trigger bank runs" and called on UK regulators to raise the issue with their US counterparts, according to the same report.

The Financial Conduct Authority told The Guardian it has been in contact with international regulators about prediction markets to protect "market integrity." The Bank of England said its supervisors engage regularly with firms on market developments and emerging risks. The Treasury did not respond to requests for comment, and HSBC and Lloyds both declined to comment, per the same report.

Polymarket's response

Polymarket's chief legal officer, Neal Kumar, defended the contracts in comments carried by The Guardian, saying the information traded on the platform is "already public" and arguing the markets extend access to financial signals that were previously available mainly to institutional investors. In a separate statement to PYMNTS, Kumar said bank failures and bailouts are among the most consequential events in the economy and that Polymarket's markets aggregate information otherwise concentrated among sophisticated financial institutions.

Similar concerns already surfaced in Washington

US regulators raised comparable worries before the UK story broke. Bloomberg reported that the Federal Deposit Insurance Corporation, under chairman Travis Hill, reviewed whether its own ethics rules were strict enough to stop staff from trading on bank-failure contracts, and questioned what legitimate investment purpose the contracts served.

Sheila Bair, a former FDIC chair, said she saw "no socially beneficial value with those kinds of contracts to offset the financial stability threats," according to the Yahoo Finance UK republication of the Bloomberg report. Senator Elizabeth Warren, the top Democrat on the Senate Banking Committee, said prediction markets operating under the current regulatory approach amounted to "the wild west." A spokesperson for rival platform Kalshi, Elisabeth Diana, called bank-failure contracts "in poor taste" and said Kalshi does not list them.

PYMNTS reported that bank-failure contracts are offered on Polymarket's international platform but are barred from its US exchange, which is regulated by the Commodity Futures Trading Commission.

Why UK bank shares are already under pressure

The betting controversy lands as UK bank stocks have come under separate pressure. Disruption Banking reported that on October 1, 2026, the 30-year UK government bond yield rose to 5.94%, its highest level since early 1998, while the 10-year yield reached 5.40%, a peak since 2007. On the same day, NatWest shares fell 5.2%, Lloyds 4.4%, Barclays close to 4% and HSBC 4%, with the FTSE 350 banks index down 4.1%.

According to the report, the sell-off followed Chancellor John Healey summoning bank chief executives to a meeting ahead of the October 28 budget, fuelling investor concern about a possible increase in taxes on banks. HSBC was reported to be less exposed than domestic-focused rivals because most of its earnings come from outside Britain.

The Guardian's report, as reproduced by AOL, also noted that UK banks have previously been warned to prepare for deposit withdrawals accelerated by social media, pointing to the 2023 collapses of Silicon Valley Bank and Credit Suisse, which followed stock sell-offs amplified by speculation on platforms such as X and WhatsApp.