UK Gambling Stocks Surge on US Bill Aiming to Block Prediction Markets from Sports Betting

On March 23, 2026, shares in UK-listed gambling companies climbed sharply after bipartisan legislation hit Capitol Hill, targeting prediction market platforms regulated by the US Commodity Futures Trading Commission, or CFTC; the bill, introduced by Democratic Senator Adam Schiff and Republican Senator John Curtis, seeks to prohibit platforms like Kalshi and Polymarket from offering sports betting contracts, a move that traditional sportsbooks stand to gain from since these upstarts have siphoned off volumes without needing state gambling licenses.

Senators Schiff and Curtis, crossing party lines in a rare show of unity on gambling matters, unveiled the bill precisely when prediction markets were exploding in popularity for sports wagers; Kalshi alone reported that sports betting accounted for roughly 90% of its trading activity, volumes that traditional operators like FanDuel and BetMGM could only dream of recapturing without the regulatory hurdles these platforms dodge by operating under CFTC oversight rather than state-by-state licensing regimes.

What's interesting here is how the bill zeroes in on CFTC-regulated entities, arguing they undermine the carefully calibrated framework states have built post-2018 Supreme Court decision that struck down PASPA; prediction markets, which let users bet on event outcomes via yes/no contracts traded like futures, have blurred lines between gambling and financial instruments, prompting lawmakers to draw a firm boundary, and in doing so, handed a potential lifeline to licensed sportsbooks.

Observers note that the timing couldn't be better for UK giants listed on the London Stock Exchange, as investors piled in betting the ban would funnel bettors back to established apps; Flutter Entertainment, which owns FanDuel—the top US sports betting brand—saw its shares jump 7.6% that day, while Entain, parent to Ladbrokes and a key player in BetMGM's joint venture, rose 6.4%, moves that outpaced the broader FTSE index.

Flutter's surge led the pack, with traders interpreting the bill as a shield against nimble competitors like Kalshi, whose sports contracts on NFL games or NBA finals have drawn millions without the 50-state licensing maze; Entain followed close behind, buoyed by its stake in BetMGM, which commands a hefty slice of US online betting revenue, and both stocks reflected broader optimism that Washington might finally clip the wings of these federally overseen platforms.

And yet, the reaction wasn't isolated; smaller peers in the sector tagged along, although Flutter and Entain dominated headlines due to their massive US footprints—Flutter's market cap hovered around billions, making its 7.6% pop a multi-hundred-million windfall in perceived value, while Entain's 6.4% gain signaled confidence in its transatlantic pivot after years of regulatory tightening at home.

Data from the London Stock Exchange captured the frenzy, with trading volumes spiking as institutional investors repositioned, betting long-term on a prediction market clampdown that echoes past efforts to ringfence sports wagering from derivatives trading.

Take Flutter: its FanDuel arm has poured billions into marketing and tech to dominate states like New York and Pennsylvania, where licensed operators pay hefty taxes and fees; prediction markets, by contrast, skirt those obligations under CFTC rules that treat event contracts as commodities, not gambles, a loophole the bill aims to seal tight.

Kalshi and Polymarket have turned heads by offering binary contracts on sports outcomes—will the Super Bowl go over 50 points? Does Team A win outright?—traded continuously like stocks, which draws in sophisticated bettors who appreciate the liquidity and low barriers; yet, with sports making up 90% of Kalshi's action, traditional operators cry foul, pointing to unlicensed intrusion on their turf, and here's where the bill steps in, proposing to yank sports from CFTC jurisdiction entirely.

Polymarket, crypto-adjacent and decentralized in flavor, has mirrored this trend, hosting election and sports markets that exploded during 2024 cycles but now face bipartisan backlash as volumes shift toward touchdowns over ballots; experts who've tracked this space have observed how these platforms' edge lies in federal preemption—no need for Nevada's nod or New Jersey's approval—allowing nationwide reach that licensed apps envy.

But here's the thing: the CFTC itself has wrestled with this, approving Kalshi's sports contracts in 2024 after years of debate, only for Congress to potentially override via Schiff-Curtis; according to CFTC announcements, such markets must be non-manipulable and public-interest serving, yet lawmakers argue sports betting demands state-level consumer protections absent in futures-style trading.

Those who've studied betting flows point to one case where Kalshi's NFL markets pulled in tens of millions weekly, dwarfing some smaller sportsbooks, while Polymarket's blockchain setup lets global users pile in without KYC headaches that plague traditional sites; the bill's backers frame this as protecting jobs, taxes, and integrity in a $10 billion-plus US sports betting industry still growing post-legalization.

Flutter and Entain, both headquartered in Dublin but LSE-listed, have bet big on America—Flutter relocated its primary listing to New York in 2024 for closer US alignment, yet London trading reacted first to the bill; Entain, meanwhile, spun off non-US assets to double down on Vegas and beyond via BetMGM, a MGM Resorts partnership that's clawed market share from DraftKings amid fierce rivalry.

Turns out, prediction markets hit these incumbents hardest in high-margin sports, where parlays and live odds drive profits; without state licenses, Kalshi avoids 10-20% vig caps or geofencing woes, undercutting prices and luring volume—90% sports dominance underscores the threat, and investors cheered the legislative riposte as a reset button.

People often find that such cross-Atlantic ripples amplify in LSE sessions, where European traders front-run Wall Street; Flutter's 7.6% leap equated to recapturing perceived lost ground, while Entain's 6.4% mirrored sentiment that BetMGM could reclaim NFL Sundays from upstarts, all without lifting a finger beyond lobbying allies like Schiff.

It's noteworthy that bipartisan support—Schiff from California, deep in tech-gambling intersections, paired with Curtis from Utah, no stranger to conservative gambling curbs—signals real momentum, unlike partisan gridlock that stalls most bills; researchers tracking legislative odds peg passage chances higher than average, boosting stock tailwinds.

Should the bill advance, states like Illinois or Michigan—home to Flutter and Entain strongholds—stand to collect more tax revenue from redirected wagers, while platforms pivot to politics or weather, diluting their sports allure; Kalshi's trajectory offers a glimpse, having pivoted from elections post-2024 scrutiny yet doubling down on hoops and gridiron until now.

And so the rubber meets the road: traditional operators, who've invested in responsible gaming tools and partnerships with leagues like the NFL, gain a moat against agile foes; Entain's Ladbrokes heritage in UK racing translates to US savvy, positioning it to absorb any exodus from Polymarket's crypto crowds.

One study from an industry group highlighted how licensed markets generated $4 billion in state taxes last year alone, figures prediction platforms chip away at sans contribution; the bill reframes this debate, casting CFTC event contracts as trojan horses for unlicensed betting, a narrative resonating in committee rooms.

March 23, 2026, marked a pivotal moment when UK gambling stocks like Flutter and Entain rode high on a US bill poised to sideline prediction markets from sports betting; with Kalshi's 90% sports volumes in the crosshairs and bipartisan muscle behind Schiff and Curtis, traditional powerhouses eye regained dominance, reshaping a landscape where federal rules once tilted the field. Investors watched closely as shares surged 7.6% and 6.4% respectively, underscoring how one piece of legislation can jolt transatlantic markets, steering bets back toward licensed lanes amid ongoing evolution of America's $100 billion wagering frontier.