The House Oversight Committee has opened a formal investigation into suspected insider trading on prediction platforms Kalshi and Polymarket, demanding detailed compliance records from both firms by June 5.
Committee Chairman James Comer announced the probe in a televised interview on Friday, saying the panel is examining trades allegedly tied to U.S. elections and to military operations in Venezuela and Iran. He said the committee is also preparing legislation to bar government personnel and members of Congress from wagering on prediction markets.
Scope of the investigation
Letters sent Friday to Kalshi chief executive Tarek Mansour and Polymarket founder Shayne Coplan request:
- Policies and procedures for verifying user identities
- Systems for enforcing location-based access restrictions
- Surveillance tools and protocols for detecting unusual or suspicious trading patterns
- Internal communications and documents related to compliance and trading oversight
The committee’s move follows a series of incidents that raised red flags about the use of non-public information on both platforms.
Recent cases that triggered scrutiny
In April, U.S. authorities arrested a soldier accused of using classified information about a planned move to oust former Venezuelan leader Nicolás Maduro. The soldier allegedly made about $400,000 by trading related contracts on Polymarket.
Separately, investigators identified more than 80 Polymarket accounts that placed trades within hours of U.S. and Israeli strikes on Iran, heightening concerns about potential access to sensitive military information.
These cases have become central examples for lawmakers arguing that prediction markets can be exploited by government insiders with access to privileged information.
Platforms tighten controls ahead of probe
Both companies took steps to strengthen monitoring before Friday’s announcement:
- Kalshi suspended three congressional candidates in April after discovering they had placed bets on their own races.
- Polymarket hired blockchain analytics firm Chainalysis in late April to help track on-chain activity and flag suspicious trading behavior.
These moves are likely to be closely examined by the committee as evidence of how the platforms respond to compliance risks.
Regulatory and legislative backdrop
The investigation was preceded by a May 11 letter from Representative Chris Pappas and six other lawmakers urging the Oversight Committee to subpoena documents from both Kalshi and Polymarket.
At the same time, bipartisan bills in Congress seek to restrict participation in prediction markets by people with access to non-public government information, including certain officials and staff. These proposals would directly affect trading on markets tied to elections, foreign policy, and military actions.
Kalshi operates under regulation from the Commodity Futures Trading Commission (CFTC) and is registered in New York. The platform does not allow anonymous participation and is structured as a regulated event-contract exchange.
Polymarket runs its primary exchange under Panamanian registration, with a separate, smaller platform supervised by the CFTC for U.S. users, reflecting a hybrid regulatory footprint that is likely to draw further examination.
Growing market draws Washington’s attention
The oversight push comes amid rapid growth in event-based trading. A single Polymarket contract tied to the 2024 U.S. presidential election has recorded more than $3.2 billion in volume, underscoring the scale of capital now flowing through these venues.
That growth, combined with the recent insider trading allegations, appears to have sharpened Washington’s focus on whether current oversight is sufficient and whether new legal guardrails are needed.
What this means for platform users and rules
For active users on Kalshi and Polymarket, the investigation signals a shift toward more aggressive federal scrutiny. Key areas likely to tighten include:
- Identity verification, particularly for politically exposed persons and government employees
- Geolocation controls to restrict users in jurisdictions with tighter rules
- Real-time monitoring of trading spikes around political and military events
Polymarket’s partnership with Chainalysis suggests that more advanced blockchain surveillance may become standard, especially for platforms dealing in tokenized or on-chain contracts.
As the June 5 deadline approaches, any public statements from Comer’s committee, Kalshi, or Polymarket will offer early clues on how far new rules might go. Parallel efforts by the CFTC to clarify the legal status of event contracts will also play a central role in shaping how these markets can operate in the U.S. going forward.
Concerned about prediction-market risks? Learn how Toobit event contracts work and how compliant platforms structure speculative markets.
Disclaimer: The content on this page is provided for general informational purposes only and does not represent the views or financial advice of Toobit. We make no guarantees regarding the accuracy or completeness of this information and shall not be held liable for any errors, omissions, or outcomes resulting from its use. Investing in digital assets involves risk; users should independently evaluate their financial situation and the risks involved. For further details, please consult our Terms of Service and Risk Disclosure.
