Prediction markets, like Polymarket and its main rival, Kalshi, have flourished in Trump's second term. Gabby Jones/AFP via Getty Images hide caption

Gabby Jones/AFP via Getty Images

Polymarket has investigated "dozens" of bets on its prediction markets related to the midterm election, according to the company's head of global intelligence and investigations, Shana Bautista.

At least two of these Polymarket investigations have been referred to its regulator, the U.S. Commodity Futures Trading Commission, according to a person who is familiar with the probes, but not authorized to speak publicly about them.

These investigations into election insider trading and manipulation come as prediction market Polymarket — and its chief competitor Kalshi — have exploded in popularity over the past year.…