“Bates of Act” signage as Democrat Representative Greg Kaiser of Texas, left, and Senator Chris Murphy, Democrat of Connecticut, hold up “Bates of Act” during a news conference at the U.S. Capitol in Washington, DC, U.S., on Tuesday, March 17, 2026.
Stephanie Reynolds | Bloomberg | getty images
US Senate On Thursday, a rule was unanimously passed barring senators from trading in prediction markets, effective immediately.
The move comes amid growing concerns about insider trading on prediction market platforms such as Kalshi and Polymarket and event contracts that may involve death or violence.
On April 22, Kalshi said it had suspended and fined one candidate for the US Senate and two candidates for the House of Representatives. political insider trading On their own campaigns.
On April 23, a US Army Special Forces soldier, Master Sgt. Gannon Ken Van Dyke was arrested in an indictment charging him with classified information for betting on Polymarket related to the US military mission to capture Venezuelan leader Nicolas Maduro.
According to the Justice Department, Van Dyke, who was involved in that mission, won approximately $410,000 on bets.
Earlier Thursday, a group of Democratic members of Congress called on the Commodity Futures Trading Commission to issue a rule “that prevents insider trading and corruption in the market and prohibits event contracts based on the outcome of elections, wars and military actions, sports and government actions in the United States or abroad without a legitimate economic hedging interest.”
Disclosure: CNBC and Kalshi have a commercial relationship that includes a CNBC minority investment.