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Officials in Norway have begun investigating suspicious betting activity surrounding the Nobel Peace Prize announcement after a dramatic spike in odds favoring Venezuelan opposition leader Maria Corina Machado, who was later declared the winner.
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According to a Bloomberg report, the sharp rise in bets on Machado triggered immediate scrutiny from regulators and the Nobel committee. The sudden odds movement appeared roughly 11 hours before the winner was revealed, suggesting that some traders may have acted on early knowledge of the decision.
Polymarket Whales, an independent tracker of large trades on the platform, flagged the unusual activity late Thursday, October 9. Data from the exchange shows that the market for the 2025 Nobel Peace Prize—quiet since July—experienced an abrupt surge in both volume and price in the hours leading up to Friday’s official announcement.
Trading logs indicate that Machado’s chances of winning jumped from below 2% to roughly 43% around 1:00 a.m. local time and climbed beyond 70% within an hour. The spike generated tens of thousands of dollars in profit for a small number of traders, including one account reportedly created less than two weeks before the event.
The Nobel committee maintains strict confidentiality around its selection process, and information about the winner is normally kept secret until the public reveal in Oslo. The sudden swing in online betting odds has therefore raised questions about whether confidential details leaked before the official announcement.
Authorities in Norway are now examining the betting data to determine whether insider trading took place. Investigators are said to be reviewing Polymarket transaction records and tracing wallet activity tied to the suspicious bets.
The incident comes as decentralized prediction markets gain attention for their transparency and ability to reflect real-time public expectations. However, cases like this highlight their potential vulnerability when real-world events depend on confidential information.
Polymarket previously drew international attention during the 2024 U.S. presidential election, when it became a major platform for political wagering and forecasting. The exchange operates under blockchain-based infrastructure, allowing users to trade positions on future outcomes with minimal oversight compared to traditional betting markets.
Authorities have not yet confirmed whether the trading activity violated Norwegian law, but regulators are expected to review whether any participants breached insider rules or accessed restricted information from the Nobel committee.