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The man who is betting more than $30 million on a Donald Trump victory wants you to know that he isn’t trying to manipulate the U.S. election.

“My intent is just making money,” the man, who called himself Théo, said during a Zoom call with a reporter from The Wall Street Journal earlier this week. He described himself as a Frenchman who had previously lived in the U.S. and worked as a trader for banks.

Théo’s huge wagers on Polymarket—a prediction market that isn’t open to Americans—drew broad attention last month after the Journal reported that four accounts on the platform had been systematically purchasing wagers on a Trump victory. The bets lifted Trump’s odds of beating Vice President Kamala Harris, as shown on Polymarket. Blockchain data showed that the accounts were all funded by the same crypto exchange, fueling debate about the motives of the “Trump whale” behind them.

Last week, New York-based Polymarket said it had contacted the Trump whale as part of an investigation into the wagers. The company described the person behind the bets as a French national with extensive trading experience and a financial-services background. The shadow of former President Donald Trump is projected on a U.S. flag as he attends a rally in Green Bay, Wis. Photo: brendan mcdermid/Reuters

“Based on the investigation, we understand that this individual is taking a directional position based on personal views of the election,” Polymarket said in a statement.

The details in Polymarket’s statement lined up with how Théo described himself. He confirmed that he had spoken to a member of Polymarket’s legal and compliance team.

Election watchers are poring over any and all data in an effort to predict the outcome of one of the most contentious—and, seemingly, close—U.S. presidential elections on record. Prediction markets that allow people to place bets on a variety of potential events have emerged as one possible way to forecast election winners. Historical research suggests that, more often than not, the presidential candidate with the best odds in betting markets before Election Day goes on to take the White House.

Yet the emergence of the Trump whale exposes the limits of today’s prediction markets: Even though volumes have surged on Polymarket this year, it is still small enough for one wealthy, opinionated individual to push prices around with a multimillion-dollar bet.

Théo emailed the Journal after the publication of an Oct. 18 article about his wagers. To prove that he was behind the Polymarket wagers, the Journal asked him to place a bet on whether Taylor Swift would announce that she is pregnant in 2024—one of the many small, nonpolitical wagers available on the platform. Minutes later, Polymarket’s website showed that one of the four accounts, Theo4, had placed a small bet on Swift’s pregnancy.

During the Zoom call, Théo wore a gray Nike sweater and sported a short, neatly trimmed beard. Speaking English with a slight accent, he said he had made his bets after concluding that polls were underestimating Trump’s support. He denied speculation that his wagers were aimed at creating a sense of momentum for Trump.

Théo declined to give his real name, and the Journal wasn’t able to confirm all the elements of his story. Although Théo said he was funding the bets with his own money, it couldn’t be determined whether this is true. Nor could the Journal rule out links between Théo and any political organization or Trump allies.

“I have absolutely no political agenda,” Théo wrote in his initial email.

Théo said he didn’t want to share his name because his own friends and children don’t know the extent of his wealth, and he doesn’t want them to know about his Trump bet. He described himself as a veteran financial investor willing to risk tens of millions of dollars on high-conviction trades. But political betting was new for him, Théo said.

Théo said he took an interest in U.S. polling data earlier this year. He observed that many polls underestimated Trump’s support in 2016 and 2020, and concluded that if Trump outperformed again this year, he would beat Harris. Théo also cited the “shy Trump voter effect”—the idea that people were reluctant to tell pollsters that they supported Trump.

“I know a lot of Americans who would vote for Trump without telling you that,” Théo said. Asked about changes that pollsters had made in their methodologies in an attempt to fix the problems of 2016 and 2020, Théo was dismissive, saying he had “not seen anything substantial.”

Théo sent dozens of emails to the Journal reporter over a two-week period. In many of them, he criticized polls from mainstream-media outlets that he saw as skewed in favor of Harris. On the Zoom call, he alleged that Democrat-aligned media organizations were laying the groundwork for social unrest by stoking expectations of a close race, instead of the Trump blowout that he anticipates.

Théo said he was caught by surprise when his trades drew public attention. He started quietly in August by betting several million dollars on Trump, using an account with the username Fredi9999. At the time, Trump and Harris had roughly even chances on Polymarket.

Théo spread out his wagers over multiple days and weeks to avoid causing a price spike. Still, as his bets grew, Théo noticed other traders were backing away from quoting prices when Fredi9999 was buying. That made it harder for Théo to get attractive prices. He created the other three accounts in September and October to obscure his purchasing, Théo said.

Now, Théo could get a payday of more than $80 million-—more than double his investment—if all of his expectations of a sweeping Trump victory come true. Besides his main wager on Trump winning the Electoral College, Théo has bet millions more on Trump winning the popular vote—a scenario that many political observers consider unlikely—and on Trump winning individual swing states such as Pennsylvania, Michigan and Wisconsin.

If Harris wins, Théo could lose most or all of his $30 million, which he described as the majority of his available liquid assets.

He is such a big trader on Polymarket that he is effectively stuck, unable to exit his wagers without crashing the market. The four “Trump whale” accounts collectively hold about 25% of the contracts on Trump winning the Electoral College and over 40% of the contracts on Trump winning the popular vote, according to data provider Polymarket Analytics.

Théo admitted feeling nervous. He voiced confidence that Trump would win—assessing his odds of winning the election at 80% to 90%—but fretted that his bets could be thrown off by an unexpected last-minute news development.

“A surprise can always occur,” Théo said.