The Insider Trading Crackdown: Why Kalshi and Polymarket Are Under Pressure to Police Their Traders

A joint Washington Post / Associated Press investigation published April 27, 2026 documented a pattern that has been quietly worrying CFTC officials for months: people with non-public information about real-world events placing large, well-timed bets on Kalshi and Polymarket.

The reporting cited:

• A US service member who allegedly placed bets on a covert military operation in Venezuela hours before it was publicly known
• Sitting politicians betting on their own primary and general election outcomes — in some cases millions of dollars across linked accounts
• A cluster of large positions opened on a US-Iran ceasefire contract minutes before President Trump publicly announced one

Pressure on the platforms is now coming from three directions: Congress, the CFTC, and traditional finance regulators who see the gap as a credibility risk for the entire derivatives market.

Why This Is Hard to Prosecute

Federal insider-trading law (10b-5 under the Securities Exchange Act, plus CFTC anti-fraud provisions) was written for securities and commodities tied to companies and physical goods. Event contracts on political outcomes don't fit cleanly:

• There's no "issuer" of an election outcome the way there is for a stock
• "Material non-public information" is an awkward concept for things like military operations or presidential decisions
• The CFTC's anti-manipulation rules apply, but proving manipulation (vs. just being well-informed) requires showing intent and a duty

Several legal scholars have argued Congress needs to write a purpose-built statute for event-contract insider trading. So far, no bill has been introduced.

What the Platforms Are Doing

In response to the WaPo / AP investigation, both platforms publicly committed to expanded surveillance:

• Kalshi announced an expanded compliance team and said it now flags positions over $25,000 on contracts where the trader has plausible non-public access (e.g., government employees on geopolitical contracts).
• Polymarket said it would adopt position limits on certain politically-sensitive contracts and is building automated detection for clustered orders that suggest coordinated insider activity.

Whether this is enough to head off enforcement or new legislation is an open question.

What It Means for Honest Traders

If you're trading prediction markets in good faith with public information, none of this affects you directly. But two indirect risks are worth tracking:

1. Position limits may tighten. Politically-sensitive markets (elections, geopolitical events, Fed decisions) could see lower per-trader caps as platforms try to manage the optics.
2. KYC will get more aggressive. Expect more verification requirements, especially for new accounts and large deposits. Government employees in particular may face additional disclosure requirements when opening accounts.

What to Watch

• Senate Banking and House Financial Services hearings. Both committees are reportedly considering hearings on prediction-market integrity in summer 2026.
• CFTC rulemaking. A formal proposed rule on event-contract surveillance is widely expected before year-end.
• First enforcement action. Any CFTC case against an alleged insider trader on Kalshi or Polymarket would be a major precedent.

Sources

• Washington Post / AP investigation, April 27, 2026
• CFTC public statements on event-contract surveillance, Q1 2026
• For deeper background, see our earlier coverage: insider trading on prediction markets

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