UK Gambling Stocks Surge on US Bipartisan Bill Cracking Down on Prediction Markets' Sports Betting

The Spark on March 23, 2026

UK-listed gambling stocks lit up trading screens on March 23, 2026, after U.S. Senators Adam Schiff and John Curtis unveiled bipartisan legislation aimed squarely at prediction market platforms offering sports betting contracts; the move, which targets CFTC-regulated entities like Kalshi and Polymarket, sent shares soaring because traditional sportsbooks stand to gain a clearer edge in the market. Flutter Entertainment, the parent of FanDuel, leaped 7.6% that day, while rival Entain—behind Ladbrokes and BetMGM—climbed 6.4%, according to data from Investing.com. Investors snapped up shares fast, betting that the bill would curb competition from these upstart platforms that have nibbled at sports wagering volumes.

What's interesting here is how a U.S. regulatory push rippled straight across the Atlantic to shake up London's gambling sector; traditional bookmakers, long entrenched in state-licensed sports betting, watched their stock values bounce as the news broke. And while the bill remains in early stages, markets reacted swiftly, signaling confidence that lawmakers might actually deliver on reining in prediction markets' bold foray into sports odds.

Breaking Down the Legislation

Senators Schiff, a Democrat from California, and Curtis, a Republican from Utah, introduced the bill to prohibit prediction market platforms under Commodity Futures Trading Commission oversight from listing sports betting contracts; this targets outfits like Kalshi, which secured CFTC approval for event contracts in 2024, and Polymarket, known for crypto-fueled election wagers that spilled into sports. The legislation argues that such platforms blur lines with illegal gambling, potentially undermining state-regulated sportsbooks that pay hefty taxes and comply with consumer protections.

Observers note the bipartisan tag—rare in today's divided Congress—as a key factor boosting its odds of advancing; Schiff's office highlighted concerns over unregulated betting volumes, while Curtis emphasized protecting established gaming frameworks. Turns out, prediction markets have surged in popularity, with Kalshi reporting millions in sports-related trades post its 2024 regulatory nod, drawing bettors seeking yes/no outcomes on games like NFL matchups or NBA finals. But here's the thing: traditional sportsbooks operate under state compacts, funneling billions in revenue to governments, whereas CFTC platforms face lighter touch federal rules.

One expert familiar with derivatives markets pointed out that the bill would force these platforms back to pure event contracts—think weather or economic indicators—leaving sports betting turf to the likes of DraftKings and FanDuel. Data from the CFTC's own releases shows Kalshi's event contract volumes exploding, yet lawmakers now seek to draw a firm line.

Flutter and Entain Lead the Charge

Flutter Entertainment tops the winner's circle with that 7.6% spike; as owner of FanDuel—the top U.S. sportsbook by market share—the Irish-domiciled firm boasts deep roots in both UK and American betting scenes, where FanDuel commands over 40% of online sports wagers in key states. Shares traded briskly on the London Stock Exchange, closing higher amid broader FTSE gains, but analysts chalk the outperformance to this bill's promise of less rivalry.

Entain followed close behind at 6.4%, its portfolio spanning Ladbrokes in the UK and BetMGM stateside—a joint venture with MGM Resorts that has carved out 15-20% U.S. market share; the company, formerly GVC Holdings, has poured billions into U.S. expansion since 2018's PASPA repeal, navigating 38 states with legal sports betting. Punters and traders alike saw the news as a tailwind, especially since BetMGM has tangled with prediction markets over overlapping offerings like player props.

And yet, the rally wasn't isolated; smaller peers like DraftKings (listed in New York) edged up too, though UK firms stole the spotlight due to their transatlantic exposure. Those who've tracked gambling M&A know Flutter and Entain have bulked up via acquisitions—Flutter's $19 billion Paddy Power Betfair merger in 2016, Entain's Ladbrokes-Coral tie-up—positioning them to capitalize when upstarts hit barriers.

Prediction Markets' Rise and the Backlash

Kalshi and Polymarket didn't build their buzz overnight; Kalshi, founded in 2021, won CFTC approval for limited event contracts in late 2024, quickly rolling out sports bets like "Will the Chiefs win the Super Bowl?"—contracts that mimic sportsbook lines but trade like futures. Polymarket, crypto-native and blockchain-based, exploded during the 2024 U.S. election with billions in volume, then pivoted to sports amid regulatory gray areas, attracting tech-savvy bettors frustrated with traditional apps' geofencing.

Figures reveal the threat: U.S. sports betting handle hit $150 billion in 2025 per the American Gaming Association, yet prediction platforms siphoned off slices via lower fees and global access; experts who've studied CFTC filings note Kalshi's daily volumes rivaling mid-tier sportsbooks in peak seasons. That's where the rubber meets the road for lawmakers—states collect 10-15% tax on sports wagers, while CFTC platforms route funds federally with minimal levies.

One case stands out: during the 2025 NFL playoffs, Polymarket's Packers-Lions contract drew $10 million in trades, per on-chain data, undercutting FanDuel's spreads and prompting complaints from state regulators. So now, with Schiff-Curtis leading the charge, platforms face a pivot or a fight; Kalshi's CEO has vowed to lobby, but bipartisan momentum suggests the writing's on the wall for sports bets.

Why Traditional Sportsbooks Cheer

Traditional operators thrive on volume and loyalty programs—FanDuel's Dynasty rewards, BetMGM's Gold tier perks—features prediction markets can't match without apps and parlays; the bill preserves this moat, ensuring bettors stick to regulated hubs with responsible gaming tools. Researchers tracking industry flows have observed that CFTC platforms lure risk-takers with 24/7 trading, but most volume stays with sportsbooks offering live odds and cash-out options.

Take Entain's BetMGM: it partnered with Yahoo Sports for data feeds, boosting props on NBA stars like LeBron James, while Kalshi sticks to binary outcomes; this granularity keeps high-rollers in-house. And for Flutter, FanDuel's NFL exclusivity deals—like with the league—cement its dominance, now fortified against federal interlopers. Observers point to 2025's data: sportsbooks netted $14 billion in revenue, per AGA reports, dwarfing prediction markets' niche plays.

But it's not just profits; compliance weighs heavy—sportsbooks verify ages, cap deposits, and fund problem gambling hotlines, mandates CFTC platforms skirt. People in the know say that's the real edge, especially as U.S. states like New York and New Jersey tighten rules amid rising addiction concerns.

Broader Ripples in Gambling Markets

The FTSE 250 gambling index jumped over 5% that Monday, with 888 Holdings and Evoke also riding the wave; investors, sensing a regulatory reset, piled in before lunch. Across the pond, Nasdaq-listed DraftKings gained 4.2%, hinting at global bets on the bill's passage. Yet hurdles loom—Senate committees must debate, and crypto lobbies like those backing Polymarket promise fierce pushback.

Those who've followed PASPA's 2018 demise recall how sportsbooks flooded new markets, hitting $10 billion handle by 2020; this bill echoes that shift, channeling flows back to incumbents. Entain's CEO noted in recent earnings that U.S. growth hinges on "level playing fields," a nod to such threats. Flutter, meanwhile, eyes further M&A, with $2 billion cash reserves fueling bets on consolidation.

Now, as March 2026 unfolds with March Madness looming, traders watch for updates; a House companion bill could accelerate things, but Senate dynamics—Schiff's Finance Committee perch—tilt odds favorably.

Conclusion

On March 23, 2026, a bipartisan U.S. bill ignited UK gambling stocks, propelling Flutter Entertainment up 7.6% and Entain 6.4% as markets priced in advantages for traditional sportsbooks over CFTC-regulated prediction platforms like Kalshi and Polymarket. The legislation underscores tensions between innovative event trading and established wagering, potentially reshaping where bettors place sports contracts. While platforms vow resistance, data and history suggest incumbents hold the high ground; investors, ever vigilant, keep eyes peeled for the next legislative turn.