UK Gambling Stocks Rally on US Bipartisan Bill Aiming to Curb Prediction Markets' Sports Betting

The Spark: Senators Introduce Targeted Legislation

On March 23, 2026, U.S. Senators Adam Schiff, a Democrat from California, and John Curtis, a Republican from Utah, unveiled bipartisan legislation designed to prohibit prediction market platforms like Kalshi and Polymarket from offering sports betting contracts; this move zeroes in on platforms regulated by the Commodity Futures Trading Commission (CFTC), potentially clearing the path for traditional sportsbooks to dominate that space without direct competition from these newer entrants.

What's interesting here is how the bill emerged amid heightened regulatory scrutiny over prediction markets, as reported by the Wall Street Journal, which highlighted ongoing debates about whether such platforms blur lines between event contracts and outright gambling.

And while prediction markets have gained traction for trading on election outcomes or economic indicators, their expansion into sports events like NFL games or NBA finals has drawn fire from lawmakers concerned about consumer protections and market integrity.

Immediate Market Response: Flutter and Entain Lead the Charge

UK-listed gambling stocks reacted swiftly to the news, with Flutter Entertainment, the Irish-based giant that owns FanDuel in the U.S., leaping 7.6% in a single session; Entain, the parent company behind Ladbrokes in the UK and BetMGM across the Atlantic, followed close behind, climbing 6.4% as investors bet on reduced competition.

Turns out, shares in these firms, traded on the London Stock Exchange, captured the spotlight because the proposed ban could shield established sportsbooks from upstarts offering similar odds through prediction contracts, where users wager on yes/no outcomes for events rather than traditional point spreads or moneylines.

Data from that trading day shows broader gains across the sector, although Flutter and Entain stood out due to their heavy U.S. exposure; FanDuel, for instance, commands a massive slice of the American sports betting market post-2018 PASPA repeal, while BetMGM partners with MGM Resorts for both online and retail betting.

Observers note that such surges aren't uncommon when regulatory tailwinds appear, especially since prediction platforms like Kalshi have marketed sports contracts aggressively, pulling in users who might otherwise stick with apps from Flutter or Entain.

Breaking Down the Bill's Focus on CFTC-Regulated Platforms

The legislation specifically targets entities under CFTC oversight, the federal agency that regulates derivatives and futures markets, including event contracts on platforms such as Kalshi, which received CFTC approval for certain elections betting in 2024; Polymarket, operating more as a crypto-based decentralized exchange, has faced similar questions about sports-related predictions despite its offshore roots.

But here's the thing: traditional sportsbooks fall under state-level gaming commissions, like Nevada's or New Jersey's, creating a regulatory divide that the bill aims to widen by keeping prediction markets out of sports altogether, thus funneling bettors back to licensed operators with robust age verification and problem gambling safeguards.

Figures from the CFTC's own reports reveal that prediction market volumes spiked during major events, yet concerns persist over manipulation risks, as seen in past probes into election contract trading.

Those who've studied this space point out that while Kalshi pushes for broader approvals, bipartisan pushback from Schiff, known for financial reform efforts, and Curtis, a tech-savvy conservative, signals real momentum; the bill's text, if passed, would amend the Commodity Exchange Act to explicitly bar sports event contracts.

Spotlight on Key Players: Flutter Entertainment and Entain

Flutter Entertainment, headquartered in Dublin but listed in London, has transformed since acquiring FanDuel in 2018, turning it into America's top sports betting app with features like live odds and same-game parlays; that 7.6% jump translated to hundreds of millions in market cap gains, reflecting investor confidence in its U.S. dominance amid this regulatory shift.

Entain, meanwhile, boasts a diverse portfolio that includes Ladbrokes' high-street shops in the UK alongside BetMGM's joint venture with MGM Resorts, which launched in 2020 and now rivals DraftKings in handle; its 6.4% climb underscores how the bill could neutralize prediction markets' edge in offering low-fee, binary sports bets.

Take one case from recent quarters where FanDuel reported record Super Bowl handles, yet prediction platforms chipped away at margins by undercutting vig; now, with this legislation, traditional books regain that ground, especially since states like New York and Pennsylvania already restrict such overlaps.

Experts who've tracked these stocks observe that London listings provide liquidity for global investors, and events like this bill introduction often trigger short squeezes, amplifying the rally as shorts cover positions.

Broader Context: Prediction Markets vs. Traditional Sportsbooks

Prediction markets operate on event outcomes phrased as contracts—will Team A win by more than 5 points?—much like binary options, but sportsbooks layer in props, futures, and teasers for deeper engagement; Kalshi's CFTC nod for limited contracts in 2024 opened the door wider, prompting platforms to eye billion-dollar sports volumes.

Yet regulatory hurdles abound, with the CFTC cautioning against gaming-like products in past advisories, while state attorneys general have lobbied against federal overreach into their turf; this bill flips that, empowering states by boxing out CFTC platforms from sports.

It's noteworthy that Polymarket, fueled by crypto, sidesteps some rules via blockchain but still draws U.S. users, leading to enforcement actions; the bipartisan nature—Schiff's consumer focus paired with Curtis's innovation balance—hints at passage potential in a divided Congress.

And so, as Wall Street Journal coverage detailed on March 23, 2026, the story unfolded with stocks surging because investors see clearer skies for incumbents, whose apps already integrate seamlessly with leagues via official data feeds.

Market Implications and Investor Sentiment

That said, the rally extended beyond Flutter and Entain to peers like DraftKings, though UK listings stole headlines due to time zone alignment with London trading; data indicates handle growth for U.S. sports betting hit $150 billion in 2025 per industry trackers, with prediction markets nibbling at 5-10% in unregulated pockets.

People who've analyzed similar regs, such as 2024's election betting clampdowns, know these moves boost stock multiples by reducing competitive threats; Flutter's forward P/E, for example, compressed post-rally, signaling undervaluation relief.

Now, with the bill in committee, lobbyists from gaming associations gear up, but early momentum favors traditional operators who've invested billions in compliance and marketing.