Kalshi joins Polymarket in sweeping user bans to head off insider trading

Kalshi and Polymarket have moved to restrict insider trading on the same day lawmakers introduced a bipartisan bill to ban popular sports event contracts.

Two major prediction market platforms, Kalshi and Polymarket, on Monday announced new trading guardrails to address insider trading amid mounting concerns of market manipulation on recent event contracts. 

It comes the same day that US lawmakers introduced a bipartisan bill to ban event contracts that resemble a “sports bet” or “casino-style game.”

Kalshi on Monday said it would preemptively ban political candidates from trading on their own campaigns and those known to be involved in college and professional sports, such as athletes, personnel, and referees.

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