Polymarket Bank-Failure Bets Spark Fears of Self-Fulfilling Bank Runs

Prediction market Polymarket is allowing users to bet on whether some of the world’s biggest banks will collapse this year, sparking warnings that such activity could potentially help fuel the financial panic it predicts.

More than $77,000 has been traded on a Polymarket market asking which major banks will fail before the end of 2026, according to The Guardian.

The list includes British banking giants HSBC and Lloyds, alongside JPMorgan Chase, BNP Paribas, Bank of America, Goldman Sachs, and others.

The amounts involved remain tiny by financial-market standards. But Liberal Democrat lawmaker Bobby Dean, a member of the UK Parliament’s Treasury Committee, has warned regulators not to dismiss the potential consequences.

His concern is that a rapidly moving prediction market could amplify existing rumors or fears about a bank, potentially encouraging depositors to withdraw their money.

That matters because banks are particularly vulnerable to crises of confidence. Even a solvent institution can come under severe pressure if enough customers suddenly demand their deposits back.

Could Betting Help Cause the Outcome?

Bank regulators have become increasingly alert to the speed at which panic can spread online following the 2023 collapse of Silicon Valley Bank. Social media helped accelerate withdrawals as customers rapidly shared concerns about the bank’s finances.

Dean told The Guardian that regulators should raise the issue with their US counterparts, warning that a sharp movement in a bank-failure market could potentially contribute to a run.

There is no suggestion HSBC or Lloyds is in imminent danger of collapse, and the probabilities assigned to them on Polymarket have remained in the low single digits.

Polymarket argues that its markets simply make information previously available primarily to professional investors more accessible to the public.

Banks and hedge funds, for example, have long traded credit default swaps—contracts that can be used to hedge or speculate on deterioration in a borrower’s creditworthiness.

Regulators Watching Prediction Markets

The UK Financial Conduct Authority (FCA) has already said financial prediction-market products it has examined amount to binary options, whose sale to British retail consumers has been banned since 2019 because of their speculative nature and risk of consumer harm.

Polymarket’s offshore platform prohibits residents of the UK, United States, European Union, Canada, and certain other jurisdictions from trading, although those geographical restrictions have reportedly been circumvented using VPNs.

The FCA has said it is discussing prediction markets with overseas regulators as part of efforts to protect financial-market integrity. The Bank of England is also monitoring developments, according to The Guardian.