House Oversight Chair Comer seeks Kalshi and Polymarket records on insider-trading controls
Comer alleged 80+ Iran-linked “suspiciously timed” trades and cited a May 13 report on geopolitics and election contracts.
House Oversight and Government Reform Committee Chair James Comer sent letters to Kalshi CEO Tarek Mansour and Polymarket CEO Shayne Coplan seeking internal records on how each platform handles insider trading. Comer tied the request to alleged “suspiciously timed” trading ahead of Iran-related military operations and warned that officials could be profiting from nonpublic information.
Key Takeaways
- House Oversight Chair James Comer requested internal records from Kalshi and Polymarket on how each platform detects and responds to insider trading.
- Comer alleged “more than 80 suspiciously timed trades” ahead of Iran military operations and claimed officials with inside information were betting and taking profits.
- The inquiry pointed to incidents described in a May 13 New York Times report, including contracts tied to Israel-Iran military actions, a Trump ceasefire announcement, and congressional election markets.
- Both venues have already made public compliance moves this spring, including Polymarket updating its insider-trading approach and Kalshi banning three US politicians from betting on their own races.
Comer Demands Kalshi and Polymarket Insider-Trading Records After Iran-Linked Trade Allegations
House Oversight and Government Reform Committee Chair James Comer has moved prediction markets from self-policing headlines into formal congressional scrutiny. In letters to Polymarket CEO Shayne Coplan and Kalshi CEO Tarek Mansour, Comer requested internal records detailing how each company handles insider trading.
Comer confirmed the outreach in a May 22 post on X. He framed the issue as a government-integrity problem, arguing Congress is concerned elected officials could use “basic insider knowledge” to profit from government actions through event contracts.
For traders, the immediate signal is not a proven case against either venue. It is the escalation itself: a House committee is now asking for internal surveillance and enforcement details at two major event-contract platforms.
The “80+ Suspicious Trades” Claim and the New York Times Incidents Cited
Comer’s letters were anchored to a specific allegation: “More than 80 suspiciously timed trades were placed ahead of Iran military operations.” He added, “Politicians and government officials with inside information are placing bets and taking profits. This insider trading must end.”
The packet does not identify the traders behind those alleged transactions or provide evidence linking them to elected officials or government insiders. That gap matters because it keeps the story in the uncertainty bucket for now, even as the rhetoric turns sharper.
Comer cited incidents described in a May 13 New York Times report, including prediction-market activity tied to Israel’s military actions against Iran, President Donald Trump announcing a ceasefire in the country’s war with Iran, and event contracts related to congressional elections. The common thread is politically sensitive information where timing advantages can be meaningful, and where Washington is likely to demand tighter monitoring expectations.
Platform Compliance Moves Already on the Record: Polymarket Update, Kalshi Politician Ban
Both platforms have already taken steps that read like pre-positioning for scrutiny. Polymarket said in March it updated its approach to potential insider trading, though the packet provides no detail on what changed.
Kalshi said in April it banned three US politicians for betting on their own races. That action sets a clear line around conflicts of interest, but it also highlights the core question Comer is now pressing: what are the platforms’ controls, and how consistently are they enforced across high-sensitivity contracts.
Signals Traders Can Track as Washington Scrutiny Builds Around Event Contracts
The next market-relevant data points are procedural, not price-based. First, whether Polymarket or Kalshi publicly respond to Comer’s letters, including what records were requested and any deadlines for production.
Second, traders should watch for follow-on House Oversight actions tied to the “more than 80” allegation, including hearings, subpoenas, or additional letters that expand the scope beyond Iran-linked contracts.
Third, the enforcement backdrop is active. In April, the US Justice Department indicted Master Sergeant Gannon Ken Van Dyke, alleging he used Polymarket event contracts tied to Nicolás Maduro’s capture to profit by more than $400,000 using classified information. Van Dyke pleaded not guilty, was released on $250,000 bail, and had travel restricted to areas of North Carolina, California and New York. Any court developments can signal how aggressively authorities intend to treat event-contract trading tied to nonpublic government information.
Finally, further platform policy changes matter. New surveillance measures or additional bans would be a tell that compliance costs are rising and that certain contract categories could face tighter access controls.
Why This Oversight Probe Matters for Prediction-Market Liquidity and Listings
I treat Comer’s letters as a market-structure headline first and a political headline second. The escalation from platform-led policy tweaks into congressional oversight raises the odds that “politically sensitive” contracts get pushed into heavier monitoring, narrower access, or more conservative listings.
The threshold that matters is whether this stays at the level of record requests or turns into compulsory process and public hearings. If that step happens while the DOJ case alleging $400,000+ in classified-information profits remains live, the setup starts to look structural rather than narrative-driven, with liquidity and product breadth taking the hit before any new rules are written.
