Jack Paul 
A new report from the New York Times says suspicious bets showed up on prediction markets shortly before two recent Times/Siena political polls became public. The timing is the issue. Vanderbilt University researchers found that a Polymarket user put almost $200,000 on Oct. 31 on Nebraska Senator Pete Ricketts being re-elected. About an hour later, a Times/Siena poll was released with Ricketts ahead.
Large wager, quick payout
The same user won more than $77,000, according to the Friday report. It is not clear whether the user had access to inside information. That question is now at the center of the review. The report also said the user placed similar large bets on other markets, including Kalshi. Kalshi declined to comment. Polymarket said it had spotted the trades and was investigating.
Researchers call for review
Brett Goldstein of the Vanderbilt Institute of National Security said the series of events is hard to dismiss as a random occurrence. He said it requires further investigation. That is a cautious way to put it, perhaps, but the pattern is unusual enough to draw attention. Prediction markets depend on traders believing the odds are fair. When bets line up closely with nonpublic information, even if no link is proven, trust can take a hit.
Not the first case
This is not the first time prediction market activity has raised legal questions. Cointelegraph reported in April that a US Army soldier had been charged after making more than $400,000 by betting on a prediction market. The Department of Justice alleged that Master Sergeant Gannon Ken Van Dyke used nonpublic information tied to a US operation involving then Venezuelan President Nicolás Maduro. Prosecutors said he was involved in planning and execution of Operation Absolute Resolve, which led to Maduro’s capture at a residence in Caracas, Venezuela, in January. The DOJ alleged he bought yes shares in related Polymarket contracts, including one on Maduro being out by Jan. 31 and another on Trump invoking War Powers against Venezuela by Jan. 31.
The new report does not prove wrongdoing in the Ricketts market. It does show why regulators and market operators may want a closer look. For now, Polymarket’s investigation is the next step. Kalshi has not commented. The Times report leaves the central question open: whether the trader simply made a lucky bet or had information that others did not.