Congress Launches Insider Trading Probe Into Prediction Markets — Polymarket & Kalshi Under Fire

Congress Launches Insider Trading Probe Into Prediction Markets — Polymarket & Kalshi Under Fire

By MakeItReal | MakeItReal | 23 May 2026


When “betting on the future” starts looking like betting with inside information

The prediction market boom is officially in Washington’s crosshairs.

A new congressional investigation is now targeting two of the biggest platforms in the space — Polymarket and Kalshi — over concerns that users may be exploiting non-public government information to profit from bets tied to political decisions, military operations, and geopolitical events.

The move is led by House Oversight Chair James Comer, who has formally requested internal records from both companies and their CEOs: Shayne Coplan (Polymarket) and Tarek Mansour (Kalshi). The focus is clear — determine whether insider knowledge is quietly being monetized on markets that were supposed to predict the future, not exploit it.

 


The core concern: insider knowledge turning into fast money

At the heart of the investigation is a simple but uncomfortable question:

What happens when someone who knows what’s about to happen can bet on it before anyone else?

According to lawmakers, the risk isn’t theoretical. The committee points to cases where trades appear suspiciously timed — sometimes placed just hours before military actions or major geopolitical announcements.

Reports cited in the investigation mention more than 80 Polymarket users allegedly showing patterns consistent with informed trading around sensitive events, including U.S. and Israeli operations linked to Iran.

Even more striking, a U.S. Army service member has already been charged for allegedly using classified information tied to operations involving Venezuela to generate over $400,000 in profits through prediction markets.


Why Washington is suddenly paying attention

Prediction markets like Polymarket and Kalshi have exploded in size, expanding far beyond niche forecasting tools into multi-billion-dollar speculative ecosystems covering:

  • Elections and political outcomes
  • Military conflicts
  • Economic indicators
  • Crypto and financial markets
  • Global crises and geopolitical events

Analysts estimate the sector could grow from tens of billions today to hundreds of billions — potentially even reaching $1 trillion in annual volume by the end of the decade if growth continues at current speed.

That scale changes everything.

Because once markets become this liquid, even small informational advantages can translate into massive profits.


The uncomfortable parallel with traditional insider trading

Regulators are drawing a direct comparison to equity markets:

If it’s illegal for a government official or corporate executive to trade stocks using privileged information, why should it be acceptable to bet on wars, sanctions, or policy decisions using the same type of advantage?

The argument gaining traction in Congress is that prediction markets may be unintentionally creating a new frontier for insider trading — one that is harder to monitor, more anonymous, and faster-moving than traditional financial systems.

Some lawmakers are already pushing for restrictions that would bar government employees and officials from participating entirely.


Kalshi vs Polymarket: two very different models under scrutiny

The investigation also highlights a structural divide between the platforms:

  • Kalshi operates as a U.S.-regulated exchange and claims strong compliance controls
  • Polymarket operates offshore with looser regulatory oversight and greater anonymity

Both companies insist they actively monitor for abusive behavior and have systems in place to detect suspicious trading patterns.

But regulators are no longer satisfied with assurances — they want raw data, internal logs, and verification systems exposed in detail.


The real tension: accuracy vs fairness

This controversy exposes a deeper philosophical conflict.

Prediction markets were originally praised because they can produce remarkably accurate forecasts by aggregating information from many participants.

But there’s a catch:

The more “accurate” the market becomes, the more it may rely on participants who shouldn’t legally be allowed to trade in the first place.

That creates a paradox:

  • Allow insiders → better prices, but unfair system
  • Block insiders → fairer system, but potentially less accurate signals

It’s the same tension that has shaped decades of financial market regulation — now reappearing in a newer, faster, less controlled environment.


A sector at a turning point

The outcome of this investigation could define the next phase of prediction markets.

Possible scenarios include:

  • A full ban on participation by government employees
  • Stricter identity verification and surveillance systems
  • New criminal penalties for using non-public information
  • Or broader classification of prediction markets under gambling-style regulation

What’s clear is that the era of “lightly regulated forecasting markets” is ending.

The question now is whether regulation will preserve innovation — or fundamentally reshape the industry’s core design.


Final thought

Prediction markets were supposed to be tools for understanding the future.

But when information asymmetry becomes extreme, they risk becoming something else entirely:
a system where the future is not predicted… but selectively revealed to those closest to power.

And that is exactly what Washington is now trying to untangle.

 


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