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Polymarket tightened its rules after questions surfaced over whether some prediction market customers engaged in insider trading.

Polymarket is moving to quash insider trading as prediction markets face scrutiny over whether some users draw on classified or other closely held information to gain an edge in betting on events.

The New York-based company said Monday that it has updated its rules to prohibit trades based on "stolen confidential information" or illegal tips. Polymarket also clarified that traders cannot place a bet if they "hold a position of authority or influence" that may influence the outcome of a certain event.

For example, CEOs of a public company would not be allowed to trade on a market focused on how many times they will use a certain word during an earnings call with Wall Street analysts. Polymarket's rules, which are now posted on a "market integrity" page on its website, apply to the company's U.S. exchange and offshore operations.

Companies like Polymarket and rival Kalshi let users wager money on the outcome of elections, sports contests and many other events. Yet while their popularity has exploded, the companies are attracting attention from lawmakers and other critics who say they violate anti-gambling regulations and who raise concerns about the integrity of trading activity on the platforms.

"There had been a lot of concern around trading on the U.S. market from outside the U.S. borders and vice versa," said Stephen Piepgrass, a partner at Troutman Pepper Locke who leads the law firm's regulatory practice. "So I do think part of this is about trying to create an approach that applies everywhere."

Polymarket said it uses a "multi-layered monitoring system" and partners with surveillance and technology specialists to determine if users are violating its terms of use. The prediction platform outlined several steps it could take if it detects questionable trading activity, including referring the matter to law enforcement and taking other disciplinary actions.