Three congressional candidates wagered on the outcome of their own elections on Kalshi, according to the prediction market, which said Wednesday that it fined and suspended the men from their platform for five years.

It is the latest high-profile case of alleged insider trading on prediction markets including Kalshi and Polymarket, which have brought bipartisan scrutiny from Congress and calls for stricter regulations of the websites where people can put money on just about anything. 

Kalshi’s disciplinary documents named Mark Moran, who is running as an independent in Virginia’s U.S. Senate race; Ezekiel Enriquez, who ran in a Texas Republican primary for a U.S. House seat; and Matt Klein, a Democratic state senator running for a U.S. House seat in Minnesota. 

Klein and Enriquez both placed bets less than $100 related to their “own candidacy,” Kalshi said. Moran said on social media that he “traded $100 on myself.”

These relatively small bets follow mammoth wagers on prediction markets earlier this year that raised eyebrows. In one case, an anonymous Polymarket user made a $400,000 profit in January on a wager that former Venezuelan President Nicolás Maduro would soon be out of office.

In March, after two U.S. senators announced legislation that threatened prediction markets, Kalshi and Polymarket highlighted new rules, including against political candidates trading on their own campaigns. 

Moran refused to reach an agreement with Kalshi and was fined the most at more than $6,200, while Klein and Enriquez did reach agreements and face penalties of over $530 and $780, respectively, the company said. All were suspended from Kalshi for five years. 

Some politicians said the punishments didn’t go far enough. U.S. Rep. Mike Levin, a California Democrat, slammed the repercussions on social media, saying, “That’s not a punishment. That’s a parking ticket.”