The prediction market platform Kalshi announced Monday that it has permanently banned former Republican Rep. George Santos and fined him $71,356, concluding that he likely engaged in insider trading when he bet against his own attendance at President Donald Trump's State of the Union address in February.

Kalshi's compliance department said it established reasonable cause to believe that Santos participated in unlawful trades. According to a disciplinary filing, Santos placed a series of large bets between Feb. 2 and Feb. 25 on whether he would attend the event, despite being prohibited from trading in that market because he could influence the outcome.

The company said Santos then began making public statements about his attendance in an attempt to influence the price of the bets, with some statements including "false or misleading statements." Kalshi referred Santos to the Department of Justice in June after detecting unusual account activity.

Santos, who was granted clemency by Trump in December in a fraud case that led to his expulsion from the House, had repeatedly discussed his intention to attend the speech. On the eve of the address, Kalshi put the odds of his attendance at close to 75%. Minutes into the speech, Santos posted on X that he had been waylaid at the airport. Social media users immediately accused him of running another scheme.

Santos turned a profit of $17,839 on his trading activity, according to Kalshi's filing. The lifetime ban, effective last Friday, prevents Santos from accessing the platform directly or indirectly. Kalshi confirmed to The Wall Street Journal that this was the first lifetime ban it had issued and that it acted because Santos did not fully cooperate with its investigation. Santos can appeal the decision to the Commodity Futures Trading Commission (CFTC).

Santos responded to the ban on X, writing: "Hey Kalshi thanks for the lifetime ban from your gambling platform. Let's see how much longer you guys are around for," followed by a kiss mark emoji.

The ban follows earlier regulatory action. In July, the CFTC ordered Santos to pay over $35,000 to settle claims related to the State of the Union trades and issued him a three-year trading ban. Santos's lawyer said at the time that he settled without admitting to the CFTC's findings.

Santos, who pleaded guilty to federal wire fraud and identity theft charges in 2024, was sentenced to 87 months in prison. Trump commuted his sentence after he served 84 days, calling Santos "somewhat of a rogue" but saying he did not deserve a harsh sentence.

In March, Santos addressed complaints about his attendance on his podcast, saying: "I guess people lost money. Some people made unexpected money. That's to show you how fragile these markets are."