Congress Stops Talking and Starts Demanding Documents

House Oversight and Government Reform Committee Chairman James Comer, R-Ky., sent formal letters on May 22, 2026, to Polymarket CEO Shayne Coplan and Kalshi CEO Tarek Mansour demanding internal records on how their platforms detect and prevent insider trading, according to CNBC. The letters are specific — Comer wants to know how each platform verifies user identity for both domestic and international accounts, how they enforce geographic restrictions, and how they flag anomalous trading activity.

The Case That Triggered It

Comer pointed directly to Gannon Ken Van Dyke, a special forces soldier who participated in a U.S. operation targeting Venezuelan President Nicolás Maduro, according to NOTUS. Prosecutors say Van Dyke pocketed $400,000 betting on military action in Venezuela — made hours before the operation became public. He now faces criminal charges.

Comer also cited suspicious trades tied to U.S. military action in Iran.

"It's the Wild West," Comer told CNBC. "There are no rules. You and I may think we know what's ethical and what's not, but there's no written law against it. This is so new and it's never been a problem until a few months ago."

Comer's statement underscores that Congress failed to write rules before the problem arrived.

What the Platforms Are Saying

Kalshi's head of communications, Elisabeth Diana, said the company "looks forward to engaging with the Committee" and is "proud of our comprehensive protections against insider trading," according to CNBC.

Polymarket did not immediately respond to requests for comment, according to CNBC.

What Mainstream Coverage Is Leaving Out

Most of the coverage frames this as a regulatory crackdown threatening the industry. The companies show little sign of concern.

Flutter Entertainment CEO Peter Jackson said on a recent earnings call that his company will keep investing in market-making on third-party prediction market platforms despite the legal uncertainty, according to CNBC. Flutter owns FanDuel Predicts. "There's a lot of noise around the legal position-setting prediction markets," Jackson said. "Until we get through and understand ultimately what the Supreme Court says, I think we're going to live with this uncertainty."

DraftKings CEO Jason Robins made similar comments. These are publicly traded companies telling their shareholders to proceed.

Private company valuations back that up. Anduril Industries just doubled its valuation to $61 billion in a new funding round last week, according to CNBC — and prediction market traders on Kalshi are already giving it a 31% chance of receiving a U.S. government equity stake in 2026. Traders also put 32% odds on quantum computing firm IonQ and 28% odds on Micron Technology getting government stakes this year.

Prediction markets are being used in real time to price government behavior, raising new questions about insider trading risk.

The Regulatory Turf War Nobody Is Resolving

A structural problem persists: nobody agrees on who's in charge.

The CFTC argues its authority over swaps and derivatives covers all event contracts. 17 states disagree, with several suing to assert their own jurisdiction. One state has moved to ban prediction markets entirely, according to CNBC. Six states are in active lawsuits with the CFTC right now.

Congress is now a third player trying to insert itself. Comer's investigation is a House Oversight action — it doesn't create law, it creates pressure.

Until someone wins the jurisdictional fight, the platforms operate in a legal gray zone. This is a governance failure years in the making.

CNBC Has a Dog in This Fight — and Didn't Bury It

CNBC disclosed at the bottom of its Kalshi coverage that it has "a commercial relationship with Kalshi that includes customer acquisition and a minority investment." Readers should factor that in when weighing CNBC's framing of prediction market stories — which has been consistently sympathetic to the industry.

BBC, Reuters, and other outlets without financial ties to Kalshi have covered the insider trading angle more critically. The contrast is noticeable.

What This Means for Regular People

If you're betting on Kalshi or Polymarket, you are operating on a platform where insiders with classified information have already profited — and may still be doing it. The Van Dyke case proved the vulnerability is real, not theoretical.

Comer's letters could produce nothing. Or they could expose internal records that show these platforms knew about suspicious trades and didn't act.

Congress is finally asking the right questions — about four years too late, but better than never.