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The Commission launched its investigation into various reports of insider betting on the election date in June 2024 after Ladbrokes flagged a bet placed by Williams, who was recorded as a politically exposed person.
Further bets flagged by operators involved other politically sensitive individuals, including Metropolitan Police officers and political advisers. The Commission charged 15 people total in April 2025. Four have now pleaded guilty.
The offences relate to special betting markets that let customers wager on the exact date of the general election.
About Griffins Quest
The exchange reported that Santos then issued public statements regarding his attendance, some deemed false or misleading, that were deliberately aimed at influencing the price of “Yes” or “No” contracts connected to his attendance.
Kalshi stated that these statements successfully moved market prices and that Santos realised profits totalling $17,839.57 from the trades. After detecting Santos’ trades, Kalshi froze his account then referred the matter to federal authorities, NPR reported.
Santos criticised the exchange and its decision to ban him from trading in a series of posts on X.
About Griffins Quest
The news comes as prediction market operators continue to form alliances with major media outlets. These deals allow news outlets to embed event contract data into their reporting and offer prediction platforms more visibility to investors and news audiences.
Polymarket has developed its media presence elsewhere. In January, it signed a deal with Dow Jones to provide its prediction market data to several of the publisher’s consumer platforms. The deal covers publications including The Wall Street Journal, Barron’s, MarketWatch and Investor’s Business Daily.
Prediction markets have become more and more intertwined with sports and entertainment businesses. Polymarket has agreements with Major League Baseball and Sportsradar. Sportsradar provides data and services for more than 20 sports leagues and competitions.