US Prediction Market Ban Bill Ignites Rally in UK Gambling Shares

The Bipartisan Push Against Prediction Markets

Senators Adam Schiff, a Democrat from California, and John Curtis, a Republican from Utah, unveiled the bill last week, positioning it as a measure to safeguard established sports betting frameworks from unregulated competition; according to details from Congress.gov, the proposal specifically bars platforms overseen by the Commodity Futures Trading Commission (CFTC) from facilitating event contracts tied to sports outcomes, a move that observers note could reshape the competitive landscape for wagering in America. Prediction markets like Kalshi and Polymarket have expanded rapidly since gaining CFTC approval in recent years, offering binary options on elections, weather, and increasingly sports events, but critics argue such contracts blur lines with traditional sportsbooks, potentially evading state-level gambling taxes and consumer protections.

What's interesting here is how the bill zeroes in on CFTC jurisdiction, leaving state-licensed sportsbooks untouched; those platforms, operating under frameworks approved post the 2018 Supreme Court decision in Murphy v. NCAA, continue to dominate with billions in annual handle across 38 states. Data from the American Gaming Association reveals sports betting revenue hit $10.9 billion in 2024 alone, underscoring the sector's scale, and traditional firms stand to gain if prediction markets lose ground in sports verticals.

And yet, proponents of the bill emphasize consumer safety, pointing to instances where prediction platforms have drawn scrutiny for thin liquidity or delayed payouts; take Kalshi, which launched sports contracts in late 2024 after a legal battle with the CFTC, or Polymarket, known for crypto-backed election bets that exploded during the 2024 U.S. presidential race. This regulatory pivot, introduced amid ongoing CFTC reviews, highlights tensions between innovation and oversight in America's $150 billion gambling economy.

Flutter and Entain Lead the Charge

Flutter Entertainment's shares rocketed 7.6% to top the FTSE 100 gainers, reflecting investor bets that FanDuel, America's second-largest sportsbook by market share, will capture displaced volume from sidelined prediction platforms; the Dublin-headquartered giant, which also runs Paddy Power and Betfair in the UK, reported $12.4 billion in U.S. revenue for 2025, with FanDuel holding steady at around 40% handle share in key markets like New York and New Jersey. Entain followed closely with a 6.4% jump, buoyed by its BetMGM joint venture with MGM Resorts, which commands the top spot in several states including Michigan and Tennessee; Ladbrokes' parent posted group revenue of £4.7 billion last year, blending UK retail strength with U.S. online growth.

Turns out, the rally extended to peers; DraftKings, though U.S.-listed, edged up 4.2% in sympathy, while smaller UK names like 888 Holdings gained 3.8%, creating a sector-wide lift estimated at over £2 billion in market cap. Trading volumes spiked threefold above averages, as funds repositioned for reduced competition; experts who've tracked these cross-Atlantic dynamics note that prediction markets captured less than 5% of total sports handle so far, yet their growth trajectory—Polymarket's volume topped $1 billion on 2024 events—alarmed incumbents wary of margin erosion.

Here's where it gets interesting: both Flutter and Entain have lobbied extensively for clear rules distinguishing licensed sportsbooks from derivatives-like contracts; Flutter's regulatory filings highlight investments in compliance tech, spending $250 million annually on responsible gaming tools, positioning them favorably as lawmakers clamp down. In early March 2026, with U.S. midterm election cycles looming, such bills gain bipartisan traction, especially as states like Nevada reinforce sportsbook primacy through bodies like the Nevada Gaming Control Board.

Prediction Markets Under Fire: A Quick Primer

Prediction markets operate as exchanges for yes/no contracts on future events, settling based on outcomes; Kalshi, CFTC-approved since 2021, pivoted to sports like NFL games and NBA finals after initial focuses on economics and climate. Polymarket, leveraging blockchain for global access, drew 10 million users during peak 2024 election trading, but faced U.S. access blocks for Americans due to unregistered status—until recent CFTC nods for limited offerings. Studies from researchers at the University of Chicago found these platforms boast superior price accuracy over polls for elections, yet sports applications raise flags over match-fixing risks and tax avoidance.

But here's the thing: traditional sportsbooks like FanDuel offer point spreads, moneylines, and props with vig built-in (typically 5-10%), channeling taxes to states—New Jersey alone collected $800 million in 2025 levies; prediction markets, treated as commodities, bypass such streams, prompting Schiff-Curtis action. Observers point to a 2025 CFTC enforcement case against a rogue platform for $15 million in penalties, illustrating enforcement gaps that the bill seeks to close definitively.

People who've studied this space often discover that while prediction volumes remain niche—Kalshi's sports handle under $500 million annually versus FanDuel's $20 billion—regulatory certainty drives capital flows; London's FTSE reacted swiftly, with Flutter's CEO noting in a March 2026 earnings call the "favorable U.S. policy environment" boosting outlook.

Why Traditional Firms Benefit Most

Established operators hold advantages in scale, marketing, and partnerships—BetMGM's deal with Yahoo Sports reaches 100 million users, dwarfing Polymarket's crypto crowd; data indicates traditional apps retain 85% of U.S. bettors, per 2025 surveys from Eilers & Krejcik Gaming, with prediction platforms appealing mainly to quant traders. The bill's passage, if enacted, could redirect even modest flows—say $100-200 million yearly—straight to incumbents, padding margins already squeezed by promos and taxes.

So, as U.S. states expand legalized betting—Illinois and Louisiana hitting records in Q1 2026—UK parents like Flutter consolidate; Entain's U.S. segment grew 25% year-over-year, fueled by BetMGM's 28% market share in regulated markets. This event underscores how transatlantic regs ripple globally, with London's exchanges pricing in reduced threats to overseas cash cows.

One case worth noting: during 2024's election frenzy, Polymarket briefly siphoned bettors from sportsbooks, but post-event retention lagged; traditional firms, with loyalty programs and live streaming, reclaimed volume effortlessly. That's the rubber meeting the road—regulatory moats protect the giants.

Market Context in March 2026

In early March 2026, broader gambling equities hovered amid inflation concerns and ad spend scrutiny, yet this bill flipped sentiment bullish; FTSE 100's gambling subsector, representing 2% of index weight, outperformed by 10% year-to-date, led by Flutter's 15% YTD gain. Investors eye committee hearings scheduled for late spring, where CFTC testimony could accelerate momentum; meanwhile, Australia's equivalent bodies monitor similar fintech bets, ensuring global alignment.

Yet challenges persist—rising U.S. hold rates (9.2% industry average) mask promo wars, but ban clarity eases overhangs. Those tracking London listings see parallels to 2021 post-PASPA rallies, when Flutter doubled from troughs.