UK Gambling Stocks Surge on US Bipartisan Bill Aiming to Curb Prediction Markets' Sports Bets

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, aimed squarely at platforms regulated by the Commodity Futures Trading Commission (CFTC), quickly rippled across Atlantic markets, sending UK-listed gambling stocks into a notable upswing. The bill, which seeks to draw a clear line between traditional sportsbooks and these emerging prediction markets, comes amid heightened U.S. regulatory scrutiny over how event contracts handle sports outcomes, a topic the Wall Street Journal has covered extensively in recent reports. Observers note that such platforms have gained traction by allowing users to bet on yes/no outcomes for sports events, much like binary options, but lawmakers argue this blurs lines with state-licensed sports wagering.

What's interesting here is the bipartisan backing; Schiff, known for his focus on financial regulations, teamed up with Curtis, who brings tech and crypto perspectives from his Utah base, signaling broad concern over CFTC oversight in an era where prediction markets exploded post-2024 elections. The legislation specifies that CFTC-regulated entities can't offer contracts tied to sports results, potentially shielding established sportsbooks from what some see as unregulated competition, although proponents of prediction markets counter that their model fosters innovation in event-based trading.

UK gambling stocks didn't waste time responding; Flutter Entertainment, the Irish-domiciled giant behind FanDuel in the U.S. and Paddy Power in the UK, saw its shares jump 7.6% in London trading that day, while Entain, parent to Ladbrokes and a key player in BetMGM's U.S. operations, climbed 6.4%, according to data from Investing.com. And it wasn't just those two; the broader sector perked up, with traders betting the bill could consolidate power back toward licensed sportsbooks amid America's patchwork of state-by-state gambling laws.

Turns out, this surge aligned with a broader FTSE 250 uptick, but gambling names outperformed, as investors weighed the potential for traditional operators to reclaim market share from prediction platforms that have siphoned bets on NFL games, NBA matchups, and even March Madness brackets. One analyst from a London trading desk observed how such news often acts like a green light for stocks battered by regulatory headwinds elsewhere, although the full impact hinges on the bill's congressional path.

Flutter Entertainment stands as Europe's largest gambling firm by market cap, with FanDuel commanding over 40% of the U.S. sports betting market according to recent CFTC filings and industry trackers; the company, listed on the London Stock Exchange and New York, reported $12.4 billion in revenue for 2025, driven largely by U.S. expansion since the 2018 Supreme Court repeal of PASPA. FanDuel's app, packed with live odds, parlays, and prop bets, has hooked millions, but prediction markets like Kalshi—approved by the CFTC in 2024 for certain event contracts—posed a fresh threat by offering similar sports wagers without the same state licensing rigmarole.

Researchers who've tracked Flutter's trajectory note how the firm navigated Illinois and New York tax hikes in early 2026 without major stumbles, positioning it well for any shift that sidelines crypto-adjacent platforms; Polymarket, for instance, saw its sports contract volumes spike 300% during the 2025 NFL season, per blockchain analytics, drawing eyes from both bettors and regulators alike.

Entain, formerly GVC Holdings, boasts a global footprint with Ladbrokes as the UK's high-street staple and BetMGM, its MGM Resorts joint venture, holding about 15% of U.S. online sports betting handle; shares in the FTSE 100 constituent surged alongside Flutter's, reflecting investor confidence that the bill could neutralize prediction markets' edge in low-friction betting. BetMGM, live in 20+ states by March 2026, integrates seamlessly with casino floors, offering a one-stop shop that Kalshi's web-based contracts can't match, although those platforms tout lower fees and global access.

Experts point out Entain's recent pivot toward U.S. growth, with 2025 revenues hitting £5.4 billion, up 12% year-over-year, fueled by BetMGM's foothold in populous states like Michigan and New Jersey; the bipartisan bill plays into this narrative, as it targets CFTC jurisdiction specifically, leaving state-regulated sportsbooks unscathed.

Kalshi and Polymarket operate in a gray zone, with Kalshi securing CFTC approval in late 2024 to trade event contracts—including weather, Oscars, and tentatively sports—while Polymarket, a crypto darling on Polygon blockchain, evaded full U.S. regulation by geoblocking Americans until enforcement eased; both let users wager on outcomes like "Will the Chiefs cover the spread?" formatted as yes/no futures, mimicking sportsbooks but under derivatives rules rather than gaming licenses. This setup irks traditional operators, who foot billions in state taxes and compliance costs annually.

But here's the thing: data from the American Gaming Association reveals U.S. legal sports betting generated $13.7 billion in 2025 tax revenue across 38 states, dwarfing prediction markets' nascent volumes, yet the latter's growth—Kalshi's user base tripled in 2025 per its own disclosures—spurred action. Senators Schiff and Curtis framed the bill as protecting consumers from unvetted platforms, citing instances where Polymarket paid out on disputed election contracts, although backers argue CFTC oversight suffices.

The U.S. gambling landscape in early 2026 buzzes with activity; post-2024 election fervor boosted prediction markets, but sports leagues like the NBA and NFL lobbied against them, fearing brand dilution, while the CFTC grappled with its dual role in commodities and emerging bets. This bill fits a pattern—recall the 2025 House probe into Kalshi's Super Bowl contracts—escalating under bipartisan pressure amid Wall Street Journal exposés on offshore flows.

Across the pond, UK firms like Flutter and Entain watch closely, as U.S. revenue now comprises 45% of Flutter's total and rising for Entain; a successful ban could unlock billions in redirected handle, especially with Super Bowl LXI looming in February 2027. Those who've studied CFTC dockets know approval processes drag, but bipartisan sponsors boost odds, per Capitol Hill trackers.

Beyond Flutter and Entain, peers like DraftKings (U.S.-listed but watched by London traders) edged up 4.2%, hinting at spillover effects; trading volumes spiked 150% for gambling ETFs that day, signaling bets on legislative momentum. Analysts from Barclays and Jefferies issued notes highlighting reduced competitive pressure, with Flutter's U.S. market share potentially expanding to 45% absent prediction rivals.

One case worth noting involves a similar 2024 CFTC clampdown on crypto derivatives, which indirectly boosted sportsbooks by curbing offshore apps; now, with states like California eyeing ballots for legalized betting, this federal move clears a path, although Polymarket vowed to challenge via courts, echoing past blockchain battles.

As March 2026 unfolds, the bill heads to committee, where amendments could tweak its scope—perhaps sparing non-sports events—but its introduction alone juiced stocks, underscoring how U.S. policy sways global gambling fortunes. Traditional sportsbooks gear up, prediction platforms pivot, and investors circle; the rubber meets the road in hearings ahead, where CFTC testimony will clarify jurisdictional turf wars. For UK-listed firms, this represents a tailwind in a year marked by tax tweaks and World Cup hype, positioning Flutter and Entain to capitalize if lawmakers hold the line.

In the end, this episode highlights the tightrope of innovation versus incumbency in a $150 billion U.S. betting market; stakeholders await the next play, but the opening gambit delivered clear winners on the London exchange.