UK Gambling Stocks Rally on US Bipartisan Bill Aiming to Sideline Prediction Markets in Sports Betting Arena

The Spark Behind the Surge

UK-listed gambling stocks lit up trading screens on March 23, 2026, when U.S. Senators Adam Schiff and John Curtis unveiled bipartisan legislation designed to prohibit prediction market platforms such as Kalshi and Polymarket from offering sports betting contracts; this move, targeting platforms regulated by the Commodity Futures Trading Commission (CFTC), sent shares of traditional sportsbooks soaring, as investors bet on a competitive edge for established players in the U.S. market.

Flutter Entertainment, the Irish powerhouse behind FanDuel and Paddy Power, jumped 7.6% in a single session, while Entain, parent to Ladbrokes, Coral, and a key partner in BetMGM, climbed 6.4%; these gains, reported amid broader U.S. regulatory scrutiny highlighted by the Wall Street Journal, reflected market anticipation that curbing prediction markets could funnel bettors back toward conventional sportsbooks, where operators like these hold dominant positions.

What's interesting here is how swiftly the market reacted, with the FTSE 250 gambling sector posting its strongest one-day performance in months; observers note that prediction markets, which allow event-based binary contracts on outcomes like sports results, have carved out a niche since gaining CFTC approval in recent years, yet traditional sportsbooks argue these platforms erode their monopoly on sports wagering.

Unpacking the Legislation's Core Provisions

Senator Adam Schiff, a California Democrat known for his focus on financial regulations, teamed up with Utah Republican John Curtis, whose background in tech underscores the bill's bipartisan appeal, to introduce the measure explicitly barring CFTC-regulated prediction markets from sports-related contracts; the legislation, detailed in a Senate press release that day, aims to close what lawmakers describe as a regulatory loophole, ensuring sports betting remains under state-level oversight via bodies like the Nevada Gaming Control Board rather than federal commodity exchanges.

Turns out, platforms like Kalshi and Polymarket have expanded rapidly by offering yes/no contracts on NFL games, NBA finals, or Super Bowl winners, often at lower vig than traditional books; but here's the thing, proponents of the bill contend these operate as unlicensed sportsbooks, bypassing state taxes and consumer protections that generate billions for U.S. states since the 2018 Supreme Court repeal of PASPA.

Data from the American Gaming Association indicates traditional sportsbooks handled over $100 billion in wagers last year alone, with states collecting $4 billion in taxes; by contrast, prediction markets, while innovative, represent a fraction of that volume, yet their growth has drawn fire from incumbents worried about market share erosion, especially as apps like FanDuel and DraftKings dominate mobile betting.

And while the bill faces hurdles in a divided Congress, its introduction alone triggered the stock reaction, as traders weighed the potential for clearer lines between derivative-like prediction trades and outright sports gambling.

Spotlight on the Big Winners: Flutter and Entain

Flutter Entertainment, listed on the London Stock Exchange and New York, leads the U.S. sports betting pack through FanDuel, which commands about 40% market share according to recent Eilers & Krejcik Gaming reports; the 7.6% spike added hundreds of millions to its market cap, rewarding shareholders who have ridden the wave of U.S. expansion since post-PASPA legalization.

Entain, meanwhile, leverages its BetMGM joint venture with MGM Resorts to challenge for second place, trailing FanDuel but gaining ground in states like New Jersey and Michigan; that 6.4% climb came on volume far above average, signaling institutional bets on regulatory tailwinds that could hobble upstarts like Polymarket, which has seen user growth via crypto integrations but lacks the infrastructure of legacy books.

People who've tracked these stocks know the pattern: any whiff of federal protectionism boosts the sector, much like past CFTC clampdowns on crypto derivatives; take one analyst note from Investing.com, which pegged the bill as a "direct positive" for UK-listed peers, given their heavy U.S. revenue exposure—Flutter derives over 40% from America, Entain around 30%.

So, while other gambling names like DraftKings (U.S.-listed) also rose, albeit less dramatically, the London-heavy FTSE names stole the show, underscoring transatlantic ties in an industry where U.S. policy ripples straight to UK boards.

Prediction Markets Under Fire: Kalshi and Polymarket in the Crosshairs

Kalshi, a CFTC-approved exchange launched in 2021, pioneered event contracts on elections and economics before venturing into sports, securing approval for limited pilots; Polymarket, blockchain-based and popular among crypto enthusiasts, skirts full CFTC oversight via offshore operations but faces U.S. user restrictions, drawing bipartisan ire for enabling unregulated sports bets.

Experts have observed that these platforms appeal to sophisticated traders with precise pricing models, often undercutting sportsbooks' juice by 1-2%; yet the bill's sponsors argue this fragments the market, confuses consumers, and deprives states of revenue—Nevada alone raked in $450 million in sports betting taxes last fiscal year.

It's noteworthy that the Wall Street Journal coverage, citing anonymous sources, framed the legislation amid heightened CFTC scrutiny of prediction markets' sports forays, which began accelerating in 2025; one case involved Kalshi's rejected bid for full NFL coverage, foreshadowing congressional intervention.

But the reality is, traditional operators like Flutter and Entain have lobbied heavily through groups like the AGA, positioning themselves as the regulated alternative with robust age verification, addiction safeguards, and partnerships with leagues—think FanDuel's NBA deal or BetMGM's NFL integrations.

Broader Regulatory Landscape and Market Implications

U.S. sports betting, legalized in 38 states by early 2026, generates steady growth, with handle exceeding $150 billion annually per recent figures from the Sports Business Journal; yet prediction markets, pegged at under $1 billion in sports volume, punch above their weight in investor minds due to disruptive potential, much like how Robinhood shook stock trading.

Now, with Schiff and Curtis championing the ban, allies in the Senate Gaming Committee signal possible amendments to existing CFTC laws; observers note Curtis's push stems from Utah's strict gambling stance, while Schiff eyes Wall Street parallels to protect retail bettors from opaque contracts.

That said, challenges loom: prediction market backers, including venture firms, decry the bill as anti-innovation, arguing event contracts foster efficient markets akin to weather futures; still, the immediate market verdict favored sportsbooks, as evidenced by parallel U.S.-listed gains in DKNG and MGM shares.

And for UK investors, this plays into a familiar narrative—Europe's mature markets, regulated by bodies like the Malta Gaming Authority, have long balanced innovation with incumbents, a model now eyed stateside.

Conclusion

The March 23, 2026, introduction of the Schiff-Curtis bill marked a pivotal moment, propelling Flutter Entertainment and Entain stocks higher on visions of a prediction-market-free sports betting landscape; while the legislation navigates Capitol Hill, its ripple effects underscore the high stakes in America's $150 billion wagering economy, where traditional powerhouses stand ready to reclaim any ground ceded to newcomers.

Markets, ever forward-looking, priced in the upside, but those who've studied these battles know outcomes hinge on CFTC input, state attorneys general, and league stances; in teh end, clearer rules could stabilize the sector, benefiting operators with deep U.S. roots like the UK giants leading Thursday's charge.