UK Gambling Stocks Rally on US Bipartisan Bill Targeting Prediction Markets' Sports Betting

UK-listed gambling stocks lit up on March 23, 2026, when U.S. Senators Adam Schiff and John Curtis unveiled bipartisan legislation aimed squarely at prediction market platforms like Kalshi and Polymarket; the bill seeks to prohibit these CFTC-regulated entities from offering sports betting contracts, a move that observers note could tilt the playing field toward traditional sportsbooks. Flutter Entertainment, the owner of FanDuel, jumped 7.6% in a single session, while Entain, parent company to Ladbrokes and BetMGM, climbed 6.4%, according to market data reported that day. This reaction unfolded amid heightened U.S. regulatory scrutiny on emerging betting platforms, as detailed in a Wall Street Journal coverage highlighting the potential shift in competitive dynamics.

What's interesting here is how quickly the market digested the news; shares in these London-listed giants responded almost immediately, reflecting investor bets that curbing prediction markets would funnel bettors back to established sportsbooks with deeper U.S. footprints. And while the bill targets only CFTC oversight—leaving state-regulated sports betting intact—the distinction matters because platforms like Kalshi have expanded into event contracts mimicking sports wagers, drawing fire from traditional operators.

Senators Schiff, a California Democrat, and Curtis, a Utah Republican, introduced the measure to close what they describe as a regulatory loophole; prediction markets, overseen by the Commodity Futures Trading Commission (CFTC), have ventured into sports-related contracts—think NFL game outcomes or NBA player stats—despite CFTC rules historically barring such "gaming" under the Commodity Exchange Act. Data from CFTC filings shows Kalshi launched election and sports contracts in recent years, amassing significant trading volume, while Polymarket gained traction with crypto-based predictions on everything from Oscars winners to Super Bowl spreads.

But here's the thing: the proposed ban wouldn't touch sportsbooks licensed by states through bodies like the Nevada Gaming Control Board, which have poured billions into compliance since the 2018 Supreme Court PASPA repeal. Experts who've tracked this space point out that traditional operators like Flutter and Entain already navigate a patchwork of 38 state regimes, complete with geofencing tech and responsible gaming tools, whereas prediction markets operate federally with lighter touch on consumer protections. Turns out, lawmakers argue this levels the field, preventing an end-run around state laws designed to curb problem gambling and ensure tax revenue flows locally.

Flutter Entertainment led the charge with that 7.6% pop, pushing its market cap higher on the London Stock Exchange; the Irish-domiciled firm, which snapped up FanDuel in a blockbuster 2018 deal, commands over 40% U.S. sports betting market share, per recent Eilers & Krejcik Gaming reports. FanDuel's app boasts millions of users across 20+ states, offering everything from NFL moneylines to live prop bets, adn analysts note its edge in user acquisition costs—often half those of rivals—stems from years of Super Bowl ads and partnerships with leagues like the NBA.

Entain wasn't far behind at 6.4%, buoyed by its BetMGM joint venture with MGM Resorts; this U.S. arm has scaled rapidly since 2021 Michigan launch, now live in 20 states with a focus on casino-sportsbook hybrids that prediction markets can't match. Figures from Entain's filings reveal BetMGM hit $2.5 billion in 2025 revenue, up 30% year-over-year, thanks to iGaming cross-sells and March Madness promotions. Observers note these firms' scale—Flutter's 2025 U.S. revenue topped $4 billion—positions them to capture any displaced volume from platforms like Kalshi, where average daily sports contract trades hover in the low millions compared to FanDuel's billions in handle.

So why the outsized reaction? Market data indicates short interest in Flutter dipped 2% pre-announcement, suggesting traders anticipated positive catalysts, while options volume spiked 150% on the news, per Bloomberg terminals tracking LSE flows.

Kalshi, a CFTC-approved exchange since 2021, pivoted to "event contracts" post-2024 election bets, rolling out sports like MLB home runs and NHL goals; its platform hit 1 million users by early 2026, with sports comprising 25% of volume, according to internal metrics shared in congressional hearings. Polymarket, crypto-native and less regulated offshore, exploded during 2024 U.S. elections—$3.3 billion in election trades alone—but faced CFTC fines in 2022 for unregistered swaps, prompting a U.S. relaunch push.

Yet the rubber meets the road in competition: traditional sportsbooks integrate parlays, teasers, and cash-out features absent in binary yes/no prediction contracts, while state apps enforce ID checks and self-exclusion linked to national databases. Researchers at the University of Nevada's gambling studies program have found that prediction markets attract quant-savvy traders over casual fans, potentially siphoning high-margin bets; one analysis showed Kalshi's sports yields averaged 5% house edge versus FanDuel's 8-10% on props, narrowing operator margins.

It's noteworthy that bipartisan support signals rare consensus in a divided Congress, especially with Schiff's history on consumer finance and Curtis's tech deregulation bent aligning on this niche issue.

The surge extended beyond Flutter and Entain; DraftKings, though U.S.-listed, edged up 4.2% in after-hours, while smaller UK peers like 888 Holdings gained 3.1%, illustrating sector-wide optimism. This comes against a U.S. betting boom—handle surpassed $150 billion in 2025 per the American Gaming Association—yet regulators grapple with innovation versus integrity, as seen in CFTC's 2024 Kalshi approval later challenged in courts.

People who've studied cross-Atlantic flows know UK firms derive 60%+ revenue from U.S. now, up from 20% pre-PASPA; Flutter's Q4 2025 earnings flagged prediction markets as a "watch item," citing 2-3% user overlap. And while the bill faces hurdles—needing House passage and Biden signature amid midterms—its introduction alone moved the needle, with implied odds on PredictIt jumping to 65% for enactment by year-end.

Take one case from 2023: CFTC sued a crypto prediction site, settling for $1.25 million, foreshadowing today's clampdown; that precedent underscores why traditional players cheer, having lobbied via groups like the Sports Betting Alliance.

On March 23, 2026, a bipartisan U.S. Senate bill zeroing in on prediction markets' sports contracts triggered a sharp rally in UK gambling stocks, with Flutter up 7.6% and Entain gaining 6.4%, as investors eyed gains for FanDuel, BetMGM, and peers. Data underscores the stakes—traditional sportsbooks' scale and state compliance position them to absorb redirected action from Kalshi and Polymarket—while the move highlights ongoing U.S. efforts to delineate futures trading from gaming. Observers watch as the legislation navigates Capitol Hill, potentially reshaping a $150 billion industry where London-listed titans hold significant sway. The ball's now in lawmakers' court, and markets will keep pricing the odds.