U.S. Senate bans members from trading on popular prediction markets

By TheStreet Roundtable

3 days ago

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A sudden shift in Washington is forcing lawmakers to rethink how political power intersects with financial markets, especially as new forms of trading blur the line between speculation and influence.

The change comes as prediction markets, once a niche corner of crypto and derivatives trading, have rapidly expanded into mainstream political discourse.

With billions of dollars tied to real-world outcomes, concerns around fairness and access to information have intensified.

Now, policymakers are moving to address those risks directly, in what could mark a turning point for how elected officials engage with emerging financial platforms.

Senate moves to ban trading on prediction markets

The U.S. Senate on April 30 unanimously passed a rule prohibiting its members from trading on prediction markets, with the restriction taking effect immediately.

The move targets platforms where users place bets on real-world outcomes, including elections, geopolitical events and policy decisions, amid growing concerns that lawmakers could exploit privileged information.

According to the report, the decision follows rising scrutiny over “insider trading on prediction market platforms such as Kalshi and Polymarket,” as well as concerns around contracts tied to sensitive events.

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The rule builds on broader legislative efforts, including proposals aimed at restricting event-based trading where participants may have influence over outcomes.

But the crackdown is not happening in isolation.

Recent enforcement actions and investigations have highlighted how quickly these markets can be exposed to misuse, particularly when participants have direct stakes in the events being traded.

Crackdowns grow as insider trading cases emerge

In the weeks leading up to the Senate’s decision, prediction markets had already begun tightening controls following multiple insider trading incidents.

On April 23, Kalshi disclosed three enforcement cases involving political candidates trading on their own election outcomes, a direct violation of exchange rules.

“All three cases concern political insider trading,” the platform said, adding that its systems flagged candidates attempting to profit from markets tied to their own campaigns.

Penalties included fines and multi-year suspensions, underscoring how even small trades can undermine market integrity.

At the same time, platforms are moving to strengthen surveillance capabilities.

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On April 30, Polymarket announced a partnership with Chainalysis to deploy what it described as a “first-of-its-kind on-chain solution” to monitor trading activity and detect insider behavior.

“Every trade, position, and settlement is recorded on a public blockchain,” Polymarket said, noting that this transparency can be used to “set a new public standard for market integrity.”

The system is designed to identify patterns “consistent with insider knowledge,” combining blockchain data with investigative tools to support enforcement and regulatory cooperation.