Kalshi Is Now the Fourth-Largest Sports Betting Operator in the US — But It Still Won’t Call Itself a Sportsbook

New data from research firm Eilers & Krejcik Gaming positions Kalshi as the fourth-largest sports betting operator in the United States by handle — trailing only DraftKings, FanDuel, and Fanatics. The analysis, published in April 2026 and based on March trading volume, shows U.S. sports prediction market activity hit roughly $2 billion in monthly handle-comparable volume, representing about 11 percent of the combined total when measured against online sports betting. At the center of that surge is Kalshi, which has climbed from ninth place to fourth in roughly one year. Despite all of that, Kalshi still describes itself as a regulated exchange and prediction market — not a sportsbook. That distinction is generating real debate in the industry.

What the Eilers & Krejcik Numbers Actually Show

Eilers & Krejcik Gaming, one of the most closely followed research firms in legal gambling, built a framework it calls the Prediction Market Monitor to measure activity across prediction market operators and compare it against traditional sportsbook handle. Using daily trade-level data from Kalshi and other platforms, the firm calculated Kalshi’s adjusted handle per adult across U.S. states and ranked it against licensed sportsbooks.

On that basis, Kalshi now sits fourth nationally, ahead of BetMGM, Caesars, Bet365, BetRivers, and theScore Bet. Eilers & Krejcik projects total U.S. prediction market activity could reach approximately $34 billion in 2026, which would equal roughly 20 percent of trailing 12-month sportsbook handle. A separate industry review by Citizens found Kalshi posted the most competitive pricing across the 2026 March Madness tournament, with an average implied margin of 4.13 percent — lower than DraftKings, FanDuel, and Fanatics across the same sample.

Kalshi’s Position: Exchange, Not Sportsbook

Kalshi has been consistent in how it characterizes its own platform. The company describes itself as a regulated futures exchange, operating under the oversight of the Commodity Futures Trading Commission rather than state gaming regulators. Users on Kalshi trade contracts tied to real-world outcomes — including sports events — rather than placing bets against a house book. Kalshi sets a fee on trades rather than setting a margin-based line, which is structurally different from how a traditional sportsbook generates revenue.

That framing is not just marketing. It has regulatory consequences. Because Kalshi operates under federal CFTC jurisdiction, it is available in all 50 states — including California and Texas, two of the largest states in the country, where traditional online sports betting remains illegal. Eilers & Krejcik found that 69 percent of all sports contracts on prediction market platforms originate in the 19 states where legal online sports betting is not available. California and Texas alone account for 43 percent of total volume. In other words, Kalshi is not primarily competing with sportsbooks in regulated states — it is filling a void where no sportsbook can legally operate.

Why the Distinction Actually Matters

The difference between a prediction market and a sportsbook is not just a branding decision — it shapes the entire legal and regulatory framework that governs the platform. Traditional sportsbooks operate under state gaming licenses, pay state taxes, and are subject to state-level responsible gambling requirements and advertising rules. Kalshi, operating as a federal exchange, bypasses that framework entirely.

That has drawn increasing scrutiny. Some state regulators and sportsbook operators argue that Kalshi is functionally offering sports betting and should be regulated accordingly, regardless of the legal structure it operates under. Kalshi and other prediction markets counter that event contracts are categorically different financial instruments from sports wagers, and that attempting to regulate them like sportsbooks misunderstands how they work.

Even in states where legal sports betting is mature and competitive, Eilers & Krejcik found Kalshi’s share of combined handle sits at approximately 2 percent — suggesting minimal cannibalization of existing sportsbook demand. The firm called that a “provisional ceiling” on substitution, meaning the evidence so far points more toward market expansion than displacement.

What This Means for Bettors

For people who bet on sports, the rise of Kalshi introduces genuine competition and real alternatives worth understanding. The pricing edge Kalshi demonstrated during March Madness is meaningful for higher-volume bettors who care about margin efficiency over time. The platform also reported that 73 percent of its total March Madness volume came from live, in-game markets — a higher rate than most traditional sportsbooks. Both DraftKings and FanDuel are expected to ramp up their own prediction market products later in 2026, which will intensify competition further. For bettors in states with legal sports betting, checking sportsbook reviews alongside prediction market options is increasingly worthwhile. The line between the two categories is already blurring, and how regulators ultimately resolve that question will shape what bettors can access and where.