US Senators' Bipartisan Bill Targets Prediction Markets' Sports Bets, Sending UK Gambling Stocks Soaring

The Bill's Introduction and Key Provisions

On March 23, 2026, U.S. Senators Adam Schiff, a Democrat from California, and John Curtis, a Republican from Utah, introduced bipartisan legislation aimed squarely at prediction market platforms such as Kalshi and Polymarket; the bill seeks to prohibit these CFTC-regulated entities from offering sports betting contracts, a move that could reshape competition in the U.S. betting landscape while clearing a path for traditional sportsbooks to dominate.

Details in the legislation highlight its focus on platforms overseen by the Commodity Futures Trading Commission (CFTC), which has grappled with classifying event contracts tied to sports outcomes; proponents argue such contracts blur lines between legitimate futures trading and outright gambling, potentially exposing retail investors to undue risks without the consumer protections found in state-licensed sports wagering operations.

What's interesting here is how the bill emerged amid heightened regulatory debates, with reports from outlets like the Wall Street Journal underscoring ongoing scrutiny of prediction markets' expansion into high-volume sports events such as NFL games or NBA finals; those platforms have drawn millions in trading volume, yet critics contend they operate in a regulatory gray zone that disadvantages established sportsbooks bound by stricter state-level rules.

Immediate Surge in UK-Listed Gambling Stocks

Markets wasted no time reacting to the news, as UK-listed gambling giants Flutter Entertainment and Entain led a broad rally; Flutter, the parent company of FanDuel which commands a massive share of the U.S. sports betting market, saw its shares jump 7.6% in a single session, while Entain, owner of Ladbrokes and a key player in BetMGM, climbed 6.4%, reflecting investor bets that the legislation tilts the playing field toward conventional sportsbooks.

And it wasn't just those two; the broader sector followed suit, with data from London exchanges showing heightened trading volumes and gains across related firms, as analysts parsed the bill's potential to sideline prediction markets' low-margin, high-speed sports contracts that have chipped away at traditional bookmakers' dominance.

Turns out, this kind of regulatory clarity acts like a green light for incumbents, especially those with deep U.S. footprints like Flutter's FanDuel app, which processes billions in wagers annually under state oversight; Entain's BetMGM partnership, meanwhile, benefits from joint ventures that have solidified its stateside presence since launching in 2018.

Observers note the timing aligns perfectly with March 2026's trading frenzy, where macroeconomic factors like steady interest rates amplified the positive sentiment around any news curbing upstart competitors.

Prediction Markets Under Fire: Kalshi and Polymarket in the Crosshairs

Kalshi, a CFTC-approved exchange that launched sports event contracts in late 2024, and Polymarket, known for crypto-backed predictions on elections and now venturing into sports, represent the new breed challenging old-school sportsbooks; these platforms allow users to trade yes/no outcomes on games, often with thinner vigs and faster settlements, drawing savvy bettors away from apps like FanDuel or BetMGM.

But here's the thing: the proposed ban doesn't touch state-regulated sportsbooks, which operate under frameworks like those from the American Gaming Association, an industry group advocating for parity; figures reveal prediction markets handled over $1 billion in sports-related volume last year alone, per CFTC filings, yet they lack geofencing or responsible gaming tools mandatory for traditional operators.

Take Kalshi's NFL contracts, for instance, where traders bet on margins or totals much like sportsbooks, but with futures-style leverage; Polymarket's blockchain model adds anonymity and global access, fueling volumes that have spiked 300% since 2025, according to platform data, although regulators worry about manipulation risks in less liquid markets.

Experts who've tracked this space point out that while prediction markets tout transparency via public ledgers, the bill's architects argue sports bets belong under gaming commissions, not commodity regulators, potentially funneling activity back to Flutter and Entain's turf.

Regulatory Backdrop and Wall Street Journal Coverage

The introduction comes against a backdrop of intensifying U.S. regulatory scrutiny, as detailed in Wall Street Journal reports that flagged prediction markets' aggressive push into sports amid post-PASPA legalization; since the 2018 Supreme Court decision, sports betting has exploded to $150 billion in annual handle across 38 states, with traditional books capturing 90% via apps and retail outlets.

So why now? CFTC enforcement actions earlier in 2026 targeted several platforms for exceeding approved contract scopes, while bipartisan lawmakers like Schiff and Curtis, who've co-sponsored fintech bills before, see this as housekeeping to protect consumers from unregulated sports wagers disguised as investments.

One study from a George Mason University gaming research unit found that 15% of prediction market users overlap with sports bettors, often chasing better odds, yet those platforms report fewer problem gambling safeguards; that gap, combined with state attorneys general complaints, has built momentum for federal intervention.

It's noteworthy that the bill enjoys support from traditional operators indirectly, as investors pile into stocks signaling reduced competition; Flutter's recent earnings beat expectations partly on U.S. growth, while Entain's restructuring has positioned it for margin expansion if prediction rivals fade.

Potential Ripple Effects Across the Atlantic

Although the action unfolds in Washington, London markets feel the direct hit, given Flutter and Entain's FTSE 100 listings and heavy U.S. revenue reliance; FanDuel alone generates over 40% of Flutter's income, per company filings, and BetMGM contributes similarly for Entain, making any pro-sportsbook shift a boon for shareholders.

Now, as the bill advances through committees, traders eye its path: passage could lock in advantages for geolocated, taxed sportsbooks, while a veto or stall might prolong the turf war; either way, March 23's surge underscores how U.S. policy moves the needle for global firms intertwined with American punters.

People who've followed cross-border gambling dynamics often discover that such events create short-term pops followed by consolidation, as seen in past regulatory wins like 2021's wire act clarifications; data from Investing.com captures the day's frenzy, with sector indices up 5-8% overall.

Yet challenges remain: prediction platforms vow legal fights, citing free market principles, and crypto angles for Polymarket add layers of SEC overlap; still, the initial market verdict favors the incumbents, rewarding Flutter and Entain's investments in compliant tech and marketing.

Conclusion

This bipartisan push by Senators Schiff and Curtis marks a pivotal moment in the tug-of-war between prediction markets and traditional sportsbooks, with UK stocks like Flutter and Entain reaping immediate gains on March 23, 2026; as CFTC-regulated platforms face curbs on sports contracts, the stage sets for established players to reclaim share in a $150 billion U.S. market, although legislative hurdles and industry pushback could temper the rally.

In the end, the story highlights regulatory forces shaping betting's future, where clarity benefits giants with skin in the state-licensed game, and investors watch closely for the next chapter.