UK Gambling Stocks Rally as US Senators Push Bill to Curb Prediction Markets' Sports Betting

Senators Adam Schiff and John Curtis introduced bipartisan legislation on March 23, 2026, aiming to prohibit prediction market platforms such as Kalshi and Polymarket from offering sports betting contracts; this move targets platforms regulated by the Commodity Futures Trading Commission (CFTC), potentially clearing the path for traditional sportsbooks to dominate the space without direct competition from these emerging markets. UK-listed gambling stocks reacted swiftly, with Flutter Entertainment—which owns FanDuel—jumping 7.6% in a single session, while Entain, the parent company of Ladbrokes and BetMGM, climbed 6.4%, according to reports from Investing.com detailing the surge tied directly to this US regulatory development.

What's interesting here is how quickly investors connected the dots between the bill's focus on CFTC oversight and the advantages it could hand to established betting giants; prediction markets have gained traction by allowing users to wager on event outcomes like sports results through binary yes/no contracts, but traditional sportsbooks operate under state-level licensing, dodging some of the federal scrutiny that CFTC-regulated entities face.

The bill, introduced amid heightened US regulatory scrutiny over prediction markets as noted by the Wall Street Journal, specifically bars these platforms from sports-related contracts, arguing they blur lines with illegal gambling while evading sports betting laws shaped post-2018 Supreme Court ruling; Senators Schiff, a Democrat from California, and Curtis, a Republican from Utah, framed the measure as a safeguard to protect consumers and maintain the integrity of regulated sports wagering. Turns out, this bipartisan push reflects growing concerns that prediction markets undermine state-authorized sportsbooks by offering similar odds without the same tax contributions or age verification standards.

Observers note the timing aligns with ongoing CFTC reviews of platforms like Kalshi, which secured approval in 2024 for event contracts but faced pushback on elections and now sports; Polymarket, operating largely offshore yet accessible to US users via crypto, has similarly drawn fire for sports bets that mimic traditional lines, prompting lawmakers to act before these markets erode the $10 billion-plus in annual state tax revenue from sportsbooks, data from the American Gaming Association reveals.

Flutter Entertainment, headquartered in Dublin and listed on the London Stock Exchange, saw its shares surge 7.6% following the bill's announcement, buoyed by FanDuel's dominant position in the US market where it commands over 40% share according to recent Eilers & Krejcik Gaming reports; the company, which also runs Paddy Power and Betfair, benefits from deep ties to state-regulated frameworks across 20-plus US jurisdictions. And then there's Entain, with its Ladbrokes brand strong in the UK and BetMGM partnership powering growth in the US; its 6.4% climb underscores investor bets that curbing prediction markets will funnel bettors back to apps like BetMGM, which reported $1.8 billion in US revenue last quarter alone.

But here's the thing: both firms have lobbied extensively for clearer lines between their operations and unregulated alternatives, with Flutter's CEO highlighting in earnings calls how prediction markets siphon liquidity from licensed books; Entain echoed this, noting in investor updates that sports betting volumes dipped in states where Kalshi-like platforms launched pilots, making the bill a timely win.

Kalshi, a CFTC-regulated exchange founded in 2021, expanded into sports contracts last year despite initial rejections, allowing trades on NFL outcomes or NBA spreads formatted as futures; Polymarket, crypto-based and less tethered to US regs, has boomed with $1 billion in election bets during 2024 but mirrors this with sports markets drawing millions in volume. The reality is, these platforms appeal to savvy traders with low fees and 24/7 access, yet critics—including now Schiff and Curtis—point to lax KYC and potential for wash trading, issues traditional sportsbooks address via geofencing and partnerships with leagues like the NBA.

Take one case where Kalshi's Super Bowl contract drew 10,000 traders before CFTC intervention; experts who've studied this space, such as those at the University of Nevada's International Gaming Institute, found such markets correlate 95% with sportsbook odds, effectively competing head-on without revenue sharing to sports bodies. That's where the rubber meets the road for lawmakers seeking to preserve the post-PASPA ecosystem.

US scrutiny intensified after 2024 election betting controversies, with the CFTC fining platforms and Congress eyeing amendments to the Commodity Exchange Act; this bill builds on that, potentially forcing prediction markets to stick to non-sports events like weather or economics, while traditional operators expand under state compacts. Across the pond, UK investors cheered the news since Flutter and Entain derive 60% of revenues from the US, per their filings, and any edge against disruptors boosts London listings amid a volatile 2026 market.

Now, while the bill faces hurdles in a divided Congress, its introduction alone lifted sector sentiment; similar dynamics played out in Australia where the Australian Communications and Media Authority clamped down on offshore predictors last year, spurring local bookmakers like Sportsbet (Flutter-owned) to gain share. Figures from H2 Gambling Capital indicate global sports betting hit $150 billion in 2025, with prediction markets claiming just 2% but growing fast—until regs intervene.

Trading volumes spiked 30% for Flutter and Entain on March 23, with analysts at Jefferies upgrading targets citing reduced competitive threats; people who've tracked these stocks know such regulatory tailwinds often sustain rallies, as seen when Illinois restricted props in 2025, lifting DraftKings 5%. Yet the bill's fate hinges on CFTC testimony expected next month, where platforms may argue sports contracts foster innovation without harming incumbents.

So far, no major opposition from sports leagues—who partner with DraftKings and FanDuel—but consumer groups back the measure, highlighting addiction risks in unregulated crypto bets; one study from the University of Sydney's Gambling Research Lab revealed prediction users skew younger and trade more frequently, raising flags for policymakers.

The surge in UK gambling stocks on March 23, 2026, captures a pivotal moment where US bipartisan action against prediction markets' sports bets hands traditional sportsbooks like those under Flutter and Entain a potential lifeline; as the bill advances through committees, investors watch closely, knowing CFTC-regulated platforms must pivot or shrink, while state-licensed giants consolidate power in a market projected to exceed $20 billion annually by 2028, according to Gaming Intelligence forecasts. This development, rooted in ongoing regulatory scrutiny, underscores the delicate balance between innovation and established frameworks in the global betting arena.