Senators just banned themselves — and their staff — from trading on prediction markets [Business Insider]

In a move that is drawing both praise and skepticism, the U.S. Senate has quietly adopted a new rule that effectively bans lawmakers and their senior staff from trading on political prediction markets. The decision, which was folded into a broader ethics package last week, comes as the once-niche world of event contracts—where users can bet on anything from election outcomes to Federal Reserve rate decisions—has exploded in popularity and regulatory scrutiny.

For years, members of Congress have been allowed to own stocks, trade in commodities, and even dabble in cryptocurrency, subject to disclosure requirements that are often criticized as toothless. But the new rule specifically targets what ethics watchdogs call the most "insider-friendly" corner of the financial market: prediction platforms like PredictIt and Kalshi, where traders can wager on exactly the kind of political and policy outcomes that lawmakers have the power to influence.

The Rule Change: What It Actually Covers

The amendment, which passed with bipartisan support in a closed-door session of the Senate Rules Committee, bars Senators, their immediate family members, and all staff earning above a certain salary threshold from buying or selling "event contracts" tied to "political events, legislative outcomes, or regulatory decisions." In plain English, this means no betting on who will win the next presidential election, whether a specific bill will pass, or even what the next Supreme Court ruling might be.

It also explicitly covers derivatives and synthetic positions that mimic these bets. The ban is not retroactive, but it applies immediately to any new contracts opened after the rule’s enactment. Violations are subject to fines and potential referral to the Senate Ethics Committee, though the exact penalties remain somewhat vague—a point of criticism from transparency advocates.

Why Now? The Explosion of Prediction Markets

To understand why the Senate felt compelled to act, you have to look at the numbers. Political prediction markets are no longer just a hobby for political junkies. The total volume wagered on the 2024 U.S. presidential election alone exceeded $3 billion across various platforms, according to data from the Crypto Council for Innovation. That's up from roughly $500 million in 2020.

More importantly, the markets have become uncannily accurate. Multiple academic studies have shown that prediction markets often outperform polls and pundits. But that accuracy creates a dangerous feedback loop: if a senator knows a bill is about to die in committee, they could theoretically place a bet against its passage before the news breaks. Even the appearance of such a trade could erode public trust.

"This isn't about whether lawmakers are actually cheating," said one Senate staffer who worked on the rule, speaking on condition of anonymity. "It's about optics. When you have a senator betting on a Supreme Court ruling, and then that ruling happens, how does that look to the voters back home? It looks like the fix is in."

Critics: A Half-Measure That Misses the Bigger Problem

Not everyone is celebrating. Good-government groups like the Campaign Legal Center and Public Citizen argue that the ban, while well-intentioned, is a distraction from the much larger issue of insider stock trading in Congress.

"Prediction markets are a sideshow," said Jordan Libowitz, a spokesman for the watchdog group Citizens for Responsibility and Ethics in Washington (CREW). "The real scandal is that members of Congress are still allowed to buy and sell shares in defense contractors while voting on defense budgets. That’s where the money is, and that’s where the ethics rules are weakest."

Indeed, the new Senate rule does nothing to address the broader STOCK Act (Stop Trading on Congressional Knowledge), which critics say is riddled with loopholes and lacks meaningful enforcement. The prediction market ban is a narrow carve-out, not a systemic reform.

Furthermore, the rule only applies to the Senate. The House of Representatives has not adopted a similar measure, meaning House members can still legally trade on prediction markets—assuming the platforms allow it. And many of the most popular prediction platforms are already restricted for U.S. users due to regulatory battles with the Commodity Futures Trading Commission (CFTC). So the practical impact of the Senate ban may be largely symbolic.

What Happens Next? Enforcement and Unintended Consequences

The biggest question now is enforcement. The Senate Ethics Committee, which will oversee the ban, is notoriously slow-moving and secretive. Past cases of alleged insider trading by lawmakers have taken years to resolve, often ending in nothing more than a letter of reprimand.

There is also the issue of how to monitor compliance. Prediction markets are global, decentralized, and increasingly operate on blockchain-based platforms where user identities are pseudonymous. A senator could theoretically use a shell account or a family member's name to place a bet, and it would be nearly impossible to trace.

"This rule is a good first step, but it’s like putting a lock on the front door while leaving all the windows wide open," said Victoria Bassetti, a former Senate ethics counsel now at the Brennan Center for Justice. "If a senator is determined to bet on a policy outcome, they will find a way. The question is whether the culture of ethics in the Senate will make them think twice."

Supporters of the ban argue that it is precisely about changing that culture. By drawing a bright line around prediction markets, they hope to signal that any form of betting on government outcomes is inappropriate—even if it remains legal elsewhere.

The Bigger Picture: Trust and Transparency

Ultimately, the Senate’s self-imposed ban on prediction market trading is a small but significant acknowledgment that the line between public service and private profit is blurrier than ever. In an age where every trade, every vote, and every Tweet is scrutinized, lawmakers are realizing that even the appearance of a conflict can be damaging.

Whether this rule actually prevents bad behavior—or simply drives it further underground—remains to be seen. But for now, at least, the betting windows in the Senate are closed.

Ahmed Abed – News journalist