UK Gambling Stocks Surge on US Bill Aiming to Curb Prediction Markets' Sports Betting Push

The Sharp Rise in London Trading

On March 23, 2026, shares of major UK-listed gambling companies climbed sharply during London Stock Exchange trading, triggered by fresh bipartisan legislation in the United States targeting prediction market platforms; Flutter Entertainment, which owns the popular FanDuel brand, jumped 7.6 percent, while Entain, parent to Ladbrokes and BetMGM, rose 6.4 percent, reflecting investor optimism over potential protections for established sports betting operators.

That said, the moves came amid a broader context where prediction markets like Kalshi and Polymarket have drawn significant trading volumes in sports outcomes—Kalshi alone reported sports betting accounting for roughly 90 percent of its activity—yet these platforms operate under Commodity Futures Trading Commission (CFTC) oversight without the state-level gambling licenses required for traditional sportsbooks.

Observers note how such volumes have pressured legacy players, but here's where it gets interesting: the introduction of this bill shifted sentiment quickly, boosting stocks as traders bet on a leveled playing field.

Details of the Bipartisan Legislation

Senators Adam Schiff, a California Democrat known for regulatory pushes, and John Curtis, a Utah Republican with a tech-friendly bent, unveiled the bill on that March day, aiming squarely to prohibit CFTC-regulated prediction markets from offering contracts on sports betting events; the measure seeks to channel such activity back to licensed sportsbooks, arguing that prediction markets evade key consumer protections and state revenue streams tied to traditional gambling.

According to reports from Investing.com, the legislation highlights how platforms like Kalshi and Polymarket, approved by the CFTC for event contracts, have expanded into NFL games, NBA outcomes, and even election bets, capturing bettors who might otherwise use apps from Flutter or Entain.

But the real kicker lies in the regulatory divide: while traditional operators navigate a patchwork of 38 state licensing regimes post-2018 Supreme Court PASPA repeal, prediction markets trade futures-like contracts federally, sidestepping those hurdles—and the taxes, age verifications, and problem-gambling safeguards that come with them.

Who Are Flutter and Entain, and Why the Boost?

Flutter Entertainment, headquartered in Dublin but with a heavy London listing, dominates US sports betting through FanDuel, which commands over 40 percent market share in states like New York and New Jersey; the company's stock had faced headwinds from rising competition, yet this bill news sparked that 7.6 percent surge, pushing its market cap higher as analysts parsed the implications for customer acquisition costs and volume retention.

Entain, meanwhile, blends UK high-street roots via Ladbrokes with US exposure through a 50-50 BetMGM joint venture with MGM Resorts; its 6.4 percent gain mirrored Flutter's, underscoring how both firms stand to gain if prediction markets lose sports contracts, since BetMGM holds strong positions in 20-plus states with integrated casino and betting apps.

Take one trading session breakdown: Flutter shares closed up after intraday highs near 8 percent, while Entain hovered around 7 percent before settling; volumes spiked, with institutional buyers piling in, betting the bill's momentum could build despite Congress's packed calendar.

What's notable here is the bipartisan tag—Schiff's consumer-protection focus pairs with Curtis's market-clarity angle, making passage more plausible than partisan efforts, and that's catnip for stock pickers eyeing gambling's $100 billion-plus US handle.

Prediction Markets: Kalshi and Polymarket Under Fire

Kalshi, a New York-based exchange CFTC-approved in 2020 for event contracts, exploded in popularity after settling NFL "yes/no" markets like "Will the Chiefs win the Super Bowl?"—by early 2026, sports made up 90 percent of trades, per its disclosures, drawing millions in open interest without brick-and-mortar overhead or state fees.

Polymarket, crypto-adjacent and known for election odds that outperformed polls in 2024, followed suit with sports launches, using blockchain for peer-to-peer settlements; yet both face scrutiny from the CFTC, which has greenlit such contracts under Commodity Exchange Act tweaks but now reckons with gambling overlaps.

Experts who've tracked this space point out a key tension: prediction markets pitch themselves as information aggregators, where odds reflect crowd wisdom on events, whereas sportsbooks build empires on parlays, spreads, and props with vigorish baked in; the bill would force Kalshi and peers to stick to elections, weather, or economics, preserving that 90 percent sports slice for FanDuel et al.

And while Kalshi volumes hit records—think $10 million daily on March Madness futures—the lack of geofencing or self-exclusion tools has irked state regulators, fueling the Schiff-Curtis push.

Broader Market Dynamics at Play

US sports betting, legalized federally in 2018, generated $13.7 billion in 2025 revenue per American Gaming Association data, with online now 90 percent of wagers; traditional operators like Flutter poured billions into marketing and tech, yet prediction markets nibble at margins by offering binary contracts at lower implied juice.

Turns out, this isn't isolated—earlier CFTC skirmishes saw platforms pivot from Oscars to elections, but sports entry post-2024 marked a volume inflection, prompting lobbying from DraftKings and FanDuel backers who argue unlicensed competition erodes trust.

People in the industry often discover that stock pops like March 23's reflect not just bill text, but procedural odds: with co-sponsors from both parties, it heads to Senate Agriculture Committee, home turf for CFTC oversight, where amendments could sharpen its edge.

Yet challenges loom—crypto fans decry overreach, claiming prediction markets foster efficiency, while states eye lost taxes; still, the immediate reaction in London underscored gambling giants' vulnerability to fintech disruptors.

Stock Performance in Context

Flutter's 7.6 percent leap added over £2 billion to its valuation that day alone, building on a year where US revenue hit €7 billion, mostly FanDuel-driven; Entain's 6.4 percent mirrored, lifting its cap amid BetMGM's push into new markets like North Carolina.

Short punch: Other peers like DraftKings rose 4 percent stateside, signaling cross-Atlantic ripple.

But here's the thing with these surges—they cool fast if bills stall, as seen in past gaming regs; analysts now watch for House companion text, with traders pricing in 60 percent odds of curbs by year-end.

One case worth noting: similar 2024 CFTC fines on unregistered platforms cleared paths for licensed growth, hinting at precedent.

Implications for Operators and Regulators

Traditional sportsbooks celebrate quietly, since Kalshi's sports dominance—90 percent of trades, equating to hundreds of millions monthly—threatens promo budgets and user stickiness; the bill, if passed, redirects flows to state-vetted apps with responsible gaming baked in.

Regulators grapple too: CFTC Chair post-2025 emphasized "novel contracts" scrutiny, while state attorneys general from Nevada to New Jersey have petitioned against prediction overreach, citing consumer risks.

It's noteworthy that bipartisan buy-in boosts viability, especially with 2026 midterms looming; observers expect hearings soon, where Flutter and Entain execs might testify on market integrity.

So, while prediction markets tout transparency via on-chain data, traditionalists counter with audited RNGs and fund segregation—core to the debate.