Kalshi built a team to crack down on insider trading, while its CEO struggles to define it on live TV

Kalshi CEO Tarek Mansour

Diarmuid Greene/Sportsfile for Web Summit via Getty Images

• Prediction markets like Kalshi and Polymarket have been dogged by concerns about insider trading.
• Kalshi announced a raft of measures to combat insider trading, including a new head of enforcement.
• On CNBC, Kalshi's CEO said some trading on little-known information was "totally fair game."

Prediction markets are booming. So are concerns that they're rife with insider trading.