The U.S. Commodity Futures Trading Commission has been making the rounds. CFTC Chairman Michael Selig confirmed this month that his agency is in active talks with all major professional sports leagues in the United States, as regulators scramble to get ahead of potential insider trading problems on prediction markets.

 

"We're talking to all the sports leagues because it's critical that they've got the best information as to what's manipulable in their markets and where the insider trading risks are," Selig said on the Faro Radio podcast. The comments come after months of escalating alarm in Washington over the explosion of prediction market trading tied to sports, politics, and military events.

 

A Market That Grew Too Fast

The numbers tell the story. Monthly trading volume on prediction markets has jumped from around $1.2 billion in early 2025 to over $20 billion by January 2026, according to blockchain research firm TRM Labs. Sports event contracts alone now make up nearly 90% of all bets placed on Kalshi over the past year, according to the Congressional Research Service. That kind of scale, combined with the potential for people with inside knowledge to profit on it, has made regulators nervous.

 

"The biggest issue that comes up is manipulation and insider trading in these markets," Selig told Front Office Sports. And the regulator isn't just talking. In March 2026, the CFTC and Major League Baseball entered into a first-of-its-kind memorandum of understanding, establishing a formal framework for confidential information-sharing between the federal agency and the league. It was a signal that more deals could be coming.

 

Leagues Are Moving, Too

The NHL, MLS, and MLB have all inked prediction market partnerships with Polymarket and Kalshi over the past several months. The NBA is reportedly in active talks with both platforms. The NFL has been the notable holdout, citing integrity concerns, and Selig declined to confirm whether those conversations are ongoing. What is clear is that the agency sees league cooperation as essential. The CFTC has told prediction markets it expects them to share information with leagues about which categories of individuals should be restricted from trading, including players, coaches, referees, trainers, and data partners.

 

The platforms themselves moved to tighten their own rules in March. Kalshi introduced new technological guardrails to block athletes from trading on contracts tied to their own leagues, and politicians from betting on their own races. Polymarket updated its rulebook the same day to prohibit trading on any information that would "violate a preexisting duty or obligation of trust," even when that information was obtained secondhand.

 

The urgency is partly driven by what has already happened in other markets. In April 2026, the CFTC filed its first-ever insider trading complaint involving event contracts, charging an active-duty U.S. Army soldier with using classified intelligence about a military operation in Venezuela to trade Polymarket contracts, generating more than $400,000 in profit. The DOJ has since signaled it will pursue criminal prosecutions for insider trading on prediction markets as well. Jay Clayton, the U.S. Attorney for the Southern District of New York, said in February that his office expects to bring fraud cases tied to prediction market trading.

 

Sports have precedent of their own. The NBA's lifetime ban of Jontay Porter and the federal charges hanging over former Miami Heat guard Terry Rozier both stem from sports betting misconduct. Prediction markets are a different product legally, but the underlying concern, that people with privileged access to information are using it to profit, is exactly the same.

 

Congress Is Watching

Capitol Hill is paying attention, too. A coalition of Democratic lawmakers sent a letter to the CFTC in late April urging the agency to issue a formal rule prohibiting certain types of event contracts and curbing insider trading. The letter, led by Sen. Jeff Merkley of Oregon, described the rapid growth of prediction markets as an "erosion of integrity" that demands regulatory action. Separate legislation has been introduced that would bar government officials from using prediction markets entirely and prohibit event contracts tied to elections, war, and sports.

 

The CFTC, for its part, published an Advanced Notice of Proposed Rulemaking in March seeking public comment on whether to amend regulations governing prediction market event contracts. Selig has framed the issue in stark terms, drawing comparisons to the offshore drift that plagued crypto markets before FTX. "I'm concerned we'll see the same with prediction markets if we keep pushing it offshore into the unregulated space," he said.

 

For now, the talks with sports leagues continue. Whether they translate into formal agreements on the scale of the MLB deal, and how quickly, may determine how effectively the CFTC can police the fastest-growing corner of the derivatives market before the next scandal breaks.