US Senate Implements Ban on Members' Prediction Market Trading Amid Insider Information Concerns

On April 30, 2026, the United States Senate took a strong self-regulatory step by unanimously passing a resolution banning its members from trading in prediction markets. This move reflects public concern that government officials could use non-public information to gain financial profits amid a historic surge in event-based contract trading volumes.

Currently, prediction markets have grown into a massive financial market with monthly trading volumes exceeding $20 billion. As the market size expanded more than 15-fold in just one year—from $1.2 billion in early 2025—the need for regulations on public officials' use of insider information has become more pressing than ever.

This resolution is an extension of a series of legislative activities that have continued since March 2026. Several bills introduced by bipartisan members, including Senators Jeff Merkley and Todd Young, aim to protect public integrity and block corrupt betting in prediction markets.

The Senate's decision is expected to have a significant impact on the operations of major platforms such as Polymarket and PredictIt. Senators chose to limit their own authority to prevent sensitive information obtained during the performance of public duties from being used as a tool to undermine market fairness.

The resolution passed yesterday, Thursday, April 30, 2026, immediately bans Senators from trading in prediction markets. The unanimous vote demonstrates a strong consensus within Congress not to tolerate the use of information gained during the policy-making process for private gain.

Public office should not be a conduit for seeking personal gain based on insider information. Recent activity in prediction markets has raised real concerns that individuals with access to sensitive non-public information could exploit that advantage for financial gain.

On March 26, 2026, Senator Jeff Merkley introduced 'S. 4226 (Prediction Trading and Corrupt Betting Prevention Act),' which includes provisions to ban gambling on elections, sports, wars, and government activities. Along with this, the bipartisan 'Financial Prediction Marketplace Fairness Act' also laid the legislative groundwork by prohibiting federal employees from betting using insider information.

Scope of Regulated Individuals and Prohibited Acts

The scope of 'covered individuals' defined by the legislation and this resolution is not limited to Congress but encompasses the entire government. It focuses on restoring public trust and enhancing market transparency by strictly limiting market participation using public status.

• President and Vice President
• Members of Congress and staff of the Senate and House of Representatives
• Cabinet members of the Executive Office of the President and officials of executive branch agencies
• Trading on event outcomes and manipulation using non-public information

The explosive growth of prediction markets was a decisive factor in the introduction of regulations. According to a report by TRM Labs, as of January 2026, more than 800,000 unique wallets participate in trading every month, and this rapid expansion has elevated the risk of insider trading to a national regulatory priority.

The 'S. 4060' bill, led by Senator Richard Blumenthal, centers on establishing anti-fraud protections and returning some regulatory authority to state governments. This strengthening of regulations imposes higher compliance obligations on prediction market operators and is evaluated as an essential step for the healthy development of the market in the future.