In a dramatic preemptive strike, prediction market giants Kalshi and Polymarket have banned insider trading and deployed new surveillance tools—a direct response to bipartisan legislation that would outlaw sports-related contracts, threatening the industry’s fastest-growing segment and reshaping the competitive landscape for sports betting rivals.
The two leading prediction market platforms, Kalshi and Polymarket, announced sweeping rule changes Monday to curb insider trading, just hours after U.S. senators introduced legislation that could eliminate their most lucrative business line: sports betting contracts.
Kalshi now bans political candidates from trading on their own campaigns and blocks anyone involved in college or professional sports from trading contracts related to those sports. Polymarket revised its rules to explicitly prohibit trading by users with confidential information or the ability to influence outcomes—a category that includes athletes, company executives, policymakers, and others with privileged access.
These moves come in direct reaction to the “Prediction Markets are Gambling Act,” introduced by Sen. Adam Schiff (D-Calif.) and Sen. John Curtis (R-Utah). The bill would ban prediction markets from offering sports-related contracts, a segment that drives much of their recent growth and includes partnerships with multiple sports leagues.
The legislative threat is immediate and severe: if enacted, it would substantially destroy Kalshi and Polymarket‘s future business prospects. Shares of FanDuel and DraftKings parent company Flutter Entertainment rose sharply on the news, signaling that investors view traditional sportsbooks as the primary beneficiaries of a prediction market crackdown.
This is not the first controversy for these platforms. Polymarket faced intense scrutiny after users profited from bets on military action in Iran and Venezuela earlier this year, apparently based on advance knowledge of President Trump’s decisions—a detail confirmed by Associated Press reporting.
State-level opposition is also intensifying. Utah, Sen. Curtis’s home state, has been particularly aggressive in blocking these platforms. Governor Spencer Cox recently signed legislation expanding the state’s gambling definition to include “prop bets,” effectively outlawing prediction markets—a move documented by the Associated Press.
Kalshi has sued to operate in states like Nevada and Utah but has found little success so far. The platforms’ main federal ally is the Commodity Futures Trading Commission (CFTC), which under Trump-appointed chairman Michael Selig has argued that federal law preempts state bans. Selig has stated he will back Kalshi in legal battles, according to Associated Press reporting.
This federal backing carries its own complications: President Trump’s son, Donald Trump Jr., invested in Polymarket through his venture capital firm and serves as a strategic adviser for Kalshi, creating a potential conflict of interest if the CFTC’s stance benefits his holdings.
For investors, the stakes are clear. The prediction market sector’s valuation hinges on sports betting expansion, now under bipartisan assault. The new insider bans are a defensive play to demonstrate regulatory compliance, but they cannot offset the existential risk of a federal sports betting ban. Traditional sportsbooks like FanDuel and DraftKings stand to gain market share, while prediction market valuations face severe compression if the legislation passes.
The industry’s rapid growth—fueled by tech-savvy platforms offering micro-markets on everything from election outcomes to game plays—has outpaced regulatory clarity. Now, with both Congress and multiple states moving to rein them in, the window for unfettered expansion is closing fast. The next 12 months will determine whether prediction markets become a permanent fixture in the financial ecosystem or a cautionary tale of regulatory overreach.
The swift rule changes by Kalshi and Polymarket are a belated acknowledgment that insider trading vulnerabilities threaten their entire model. But legislative action in Washington poses a far greater danger. Investors should monitor the bill’s progress closely and reevaluate exposure to prediction market platforms, as sports contract bans would render their business models largely untenable. Meanwhile, traditional sportsbook operators appear positioned for renewed dominance in a potentially reshaped landscape.
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