Aided by supportive policies under U.S. President Donald Trump's second administration, the predictions market industry, including Polymarket, has surged over the past two years. | REUTERS

NEW YORK – A U.S. regulator is investigating whether prediction market operator Polymarket violated a 2022 enforcement deal in which it promised to ban U.S. users from its main overseas platform, reviving an inquiry the agency shuttered last year without bringing charges, said two people familiar with the matter.

The Commodity Futures Trading Commission is probing whether Polymarket took sufficient steps to keep U.S. users off the platform as part of a broader investigation it opened into the company earlier this year, the people said.…