Senate bars members and staff from prediction-market trading

The Senate adopted a rule prohibiting senators, Senate officers and staff from buying, selling or holding positions in prediction markets tied to votes, legislation, nominations or other official Senate business. The Senate Ethics Committee will oversee enforcement, investigate suspected violations and may recommend disciplinary action.

The ban includes employees who work for committees and leadership offices. It covers contracts and similar instruments on commercial platforms and smaller experimental exchanges whose value depends on the outcome of congressional or political events.

Ethics officials cited concern that such trades could exploit nonpublic information or create conflicts of interest related to legislative activity. Backers of the rule argued that restricting participation reduces the risk that financial interests could affect legislative judgment. Critics argued the policy narrows personal financial activity for public servants and could be hard to enforce across a growing field of online platforms.

Prediction markets are online platforms where users buy and sell contracts that pay out if a specified event occurs, such as whether a bill will pass, when a vote will take place or the timing of a nomination. Regulators have questioned whether some contracts qualify as securities or otherwise fall under federal oversight.

The Ethics Committee will issue guidance for Senate offices and staff on the scope of prohibited transactions and the process for reporting potential violations. The rule does not ban broadly diversified investments that do not hinge on specific Senate outcomes and does not affect lawful trading in standard public markets unrelated to congressional matters. Offices were instructed to review personal accounts and avoid positions that could violate the ban.