US Congressman Bids to Block Lawmakers From Trading on Prediction Markets

Wisconsin Representative Bryan Stiel, Chairman of the House Administration Committee, has introduced draft legislation designed to prohibit members of Congress from participating in political prediction market trading. The proposed bill, titled the Stop Lawmakers From Predicting Act, targets platforms including Kalshi and Polymarket that facilitate contracts tied to political outcomes.

The initiative addresses concerns about potential conflicts of interest and insider trading risks inherent in allowing elected officials to profit from predictions about legislative outcomes, electoral results, or policy decisions in which they hold direct influence. Prediction markets have grown in prominence as alternative venues for price discovery on uncertain events, but their application to political outcomes creates unique ethical and regulatory questions when participants include those with material information advantages.

Prediction market platforms have expanded rapidly in recent years, attracting both retail and sophisticated traders seeking exposure to event-driven contracts. However, the involvement of sitting lawmakers raises questions about information asymmetries and the appropriateness of elected officials benefiting financially from their own legislative or political activities.

Stiel's proposal reflects broader congressional interest in regulating prediction markets and establishing guardrails around their use by public officials. The bill's introduction signals growing recognition that existing financial conflict-of-interest rules may not adequately address the novel risks posed by prediction market participation, particularly for members with direct policy influence over outcomes being traded.