UK Gambling Giants Surge on US Bill Cracking Down on Prediction Markets' Sports Betting

The Surge Hits London Stocks

On March 23, 2026, shares in major UK-listed gambling companies rocketed upward, sparked by fresh bipartisan legislation in the US targeting prediction market platforms; Flutter Entertainment, the parent of FanDuel, climbed 7.6% while Entain, which owns Ladbrokes and holds a stake in BetMGM, jumped 6.4% on the London Stock Exchange.Investing.com reported the moves as investors bet on a win for traditional sportsbooks, since the bill from Senators Adam Schiff and John Curtis aims straight at outfits like Kalshi and Polymarket.

What's interesting here is how quickly the market reacted; traders saw the proposal as a shield for established operators, who face stiff competition from these CFTC-regulated platforms offering sports betting contracts without the usual state gambling licenses. And that same day, volumes spiked, turning what could have been a sleepy trading session into a full-throttle rally for the sector.

Breaking Down the Bill's Core Targets

Senators Schiff, a Democrat from California, and Curtis, a Republican from Utah, introduced the measure to prohibit prediction markets under CFTC oversight from dabbling in sports betting; they argue it levels the playing field, given that platforms like Kalshi have funneled nearly 90% of their trading volume into sports events, pulling in bettors who might otherwise stick with licensed sportsbooks. Data from Kalshi itself underscores the scale—sports contracts dominate their activity, bypassing the patchwork of state regulations that traditional operators navigate daily.

But here's the thing: prediction markets operate differently, framing bets as trades on event outcomes rather than straight gambles, which lets them skirt some rules; the bill seeks to close that gap, directing the CFTC to enforce a ban and protect the integrity of sports wagering as defined under state laws. Observers note this bipartisan push reflects growing unease in Washington over unregulated volumes eroding licensed revenue streams.

Flutter and Entain: The Big Winners in the Spotlight

Flutter Entertainment leads the charge wth its FanDuel arm dominating the US market; the company, listed on the LSE under the ticker FLTR, saw its shares hit a high not seen in months after the bill's announcement, as analysts pointed to reduced competition from nimble prediction upstarts. Entain, trading as ENT, followed suit—its BetMGM joint venture with MGM Resorts stands as a powerhouse in states like New Jersey and Michigan, where licensed betting thrives under strict oversight.

Take Flutter: recent quarterly figures show FanDuel commanding over 40% market share in US sports betting, yet prediction markets have chipped away at edges in high-profile events like NFL games; this legislation, if passed, hands them back some control. Entain's rise mirrors that—Ladbrokes keeps UK punters loyal while BetMGM expands stateside, and the stock pop signals investor confidence in their moats against CFTC-permitted rivals.

London traders piled in fast; by midday, Flutter traded over 2 million shares, well above average, while Entain's volume doubled—classic signs that the Street views the bill as more than hot air.

Prediction Markets' Rise and the Licensed Betting Clash

Kalshi and Polymarket have exploded onto the scene, drawing savvy bettors with low fees and broad event coverage; Kalshi, approved by the CFTC in late 2024, quickly pivoted to sports after elections, reporting sports bets as 90% of trades by early 2026—think Super Bowl odds or NBA finals without needing Nevada or New Jersey licenses. Polymarket, crypto-rooted and decentralized, mirrors that pull, especially among younger users chasing yes/no contracts on game scores.

Traditional operators, meanwhile, pour billions into compliance—state-by-state taxes, age verification, problem gambling programs—and resent platforms that vacuum up action offshore or via federal loopholes; the American Gaming Association has long flagged this, with reports showing prediction volumes rivaling mid-tier sportsbooks in peak seasons. Yet prediction advocates counter that their markets boost liquidity and accuracy, citing studies where crowd wisdom nails outcomes better than Vegas lines.

Still, the bill zeroes in on sports specifically, leaving election or economic contracts untouched; that's where regulators draw the line, preserving tools for hedging while slamming betting parallels.

Market Ripples Beyond the LSE

The London surge rippled to US peers indirectly; DraftKings, Flutter's arch-rival, edged up 3% in after-hours Nasdaq trading, hinting at sector-wide relief even if the bill favors no one explicitly. Entain's BetMGM stake amplified its gains, as Wall Street crunched numbers on recaptured market share—estimates peg prediction sports volumes at $500 million monthly by Q1 2026, a slice traditional books want back.

Investors watched regulatory winds closely; past CFTC nods to Kalshi fueled crypto betting hype, but Schiff-Curtis flips the script, echoing 2025 hearings where lawmakers grilled platforms on consumer protections. And while the bill faces hurdles—committee reviews, amendments—it galvanized UK stocks first, given their heavy US exposure (Flutter derives 60% revenue from America).

Short interest in Flutter dropped 15% that week, per LSE data; bears covering positions as the rally built momentum, underscoring how policy news swings fortunes overnight.

Broader Context in US Gambling Regulation

Since the 2018 PASPA repeal, US sports betting ballooned to $150 billion in annual wagers across 38 states, fueling a $12 billion tax haul; licensed operators like FanDuel and BetMGM thrive amid that, but prediction markets slipped through cracks, approved under Commodity Exchange Act as non-gambling derivatives. The CFTC's hands-off stance shifted post-2024 elections, when volumes soared, prompting bipartisan scrutiny.

Senator Curtis, tech-savvy and pro-innovation, teamed with Schiff, a gambling reform voice, to thread the needle—curb sports bets while nurturing prediction for finance; their bill mandates CFTC rulemaking within 180 days, potentially reshaping a corner of the $100 billion global gambling market. UK firms, with transatlantic footprints, feel it keenly; Flutter's Paddy Power and Entain's Coral stay rooted in licensed realms, yet US battles dictate their valuations.

One case stands out: Kalshi's 2025 NFL playoff contracts drew 1 million trades, per platform stats, dwarfing some state handles—fuel for the fire now burning traditional stocks higher.

Conclusion

March 23, 2026, marked a pivotal moment as UK gambling stocks like Flutter and Entain soared on the Schiff-Curtis bill, poised to bar CFTC prediction markets from sports betting and bolster licensed giants; with Kalshi's 90% sports dominance in the crosshairs, investors signaled clear bets on a regulatory pivot favoring the old guard. While the legislation navigates Capitol Hill, the LSE reaction lays bare the high stakes—volumes, licenses, and billions hang in balance, keeping traders glued to every update.

That said, the real test comes in committee; passage could cement traditional sportsbooks' edge, or dilution might temper the rally, but for now, the surge tells its own story in no uncertain terms.