DraftKings told investors on June 9 that its prediction markets business is scaling fast, and the market liked what it saw. The company's Form 8-K reported that May 2026 annualized consumer volume in its Predictions offering rose 24% month over month to $1.3 billion, while annualized total volume traded climbed 34% to $3.1 billion. Shares of DraftKings jumped roughly 10% in early trading on the news.
Those figures are enormous for a product line that's barely six months old, since DraftKings only launched Predictions in December 2025. Seen against the broader category, though, they show a company that's arriving late to a market prediction-native platforms have already built into something far larger.
That $3.1 billion is an annualized run rate, which translates to roughly $258 million in actual volume in May. Kalshi, by comparison, processed $17.9 billion in May alone.
The gap between DraftKings $258 million and prediction markets' $24 billion
Prediction markets let people trade contracts tied to the outcome of future events, anything from elections and inflation data to sports results and crypto prices. Each contract pays out $1 if the event happens and $0 if it doesn't, and the price in between works like a live probability gauge: a contract trading at 65 cents means traders collectively give the outcome a 65% chance.
You can hold until the event resolves or sell early at the going price, just as you would with a stock. That structure essentially makes these platforms behave like financial exchanges, with order books and constantly moving prices, which is a large part of why so many companies are rushing in.
It also helps to decode one piece of accounting in the DraftKings announcement. “Annualized” means the company took one month of activity and multiplied it by 12, which is a standard way to show momentum but makes the headline number 12 times bigger than what actually happened.
Strip that out, and DraftKings handled about $258 million of trading in May. The established platforms operate on a different scale entirely. Combined monthly trading volume on Kalshi and Polymarket, the two biggest names, climbed from under $5 billion in September 2025 to about $24 billion in April 2026, according to a Pew Research Center analysis.
May data, released after the Pew study, showed the two platforms moving in opposite directions: Kalshi notched its ninth straight monthly record at $17.91 billion, while Polymarket fell to $7.08 billion, its second consecutive monthly decline.
For perspective, all legal US sportsbooks combined took in around $14 billion in wagers per month across 2025. The prediction markets category DraftKings just entered already moves more money than the industry DraftKings came from.
However, it's important to note that every platform measures volume differently. Robinhood skips dollars altogether and reports the number of contracts traded, a figure that sounds astronomical because contracts almost always cost less than a dollar each.
Its CEO, Vlad Tenev, said over 12 billion contracts were traded on the platform in 2025 and predicted the business could eventually drive “trillions” in annual volume, while Deutsche Bank counted more than 16 billion contracts so far in 2026. The measures vary, but every version of the math leads to the same place: DraftKings' May volume is roughly what Kalshi moves in a week.
Sports are the engine pulling all of this forward, which explains why a sportsbook felt compelled to show up. Sports alone account for roughly 80% of Kalshi's volume, and together with politics and crypto, it has driven about 91% of Kalshi's activity and 90% of Polymarket's since July 2024, as CryptoSlate has reported.
DraftKings timed its disclosure well, landing days into the 2026 World Cup and just after the NBA Finals, and one estimate put potential World Cup prediction market activity as high as $2.5 billion.
What the sportsbooks are really chasing
Each side of this fight has weapons that the other lacks. Sportsbooks bring millions of existing customers, famous brands, payment infrastructure, huge marketing budgets, and years of experience in pricing live odds.
The prediction-native platforms bring deep pools of traders ready to take the other side of any contract, a much wider menu of events, and, crucially, a legal structure that lets them operate where sportsbooks can't.
DraftKings CEO Jason Robins told investors the company intends to establish a leadership position in sports predictions before year-end, and the company has raised its estimate of the total market it can address to between $55 billion and $80 billion.
That legal structure is the whole reason this category exists. Sports betting in America is governed state by state, and each sportsbook needs a license in every state where it operates. Event contracts take a different legal route: they're classified as derivatives, financial instruments overseen only by the CFTC, the same regulator that watches over futures on oil and corn. A federal license means one approval covers the whole country. It's how DraftKings launched Predictions in 38 states, including several where online sports betting remains illegal.
Whether that route survives is now the central legal fight in American gambling. A federal appeals court ruled on April 6 that Kalshi's sports contracts likely fall under exclusive federal jurisdiction, shielding them from New Jersey's gambling enforcement.
Ten days later, a different appeals court, hearing Nevada's case, seemed inclined to rule the opposite way. If the courts split, the Supreme Court usually has to settle it, and prediction market traders themselves price a 64% chance the high court takes a case by year-end.
Meanwhile, the enforcement keeps escalating in both directions: the CFTC sued Arizona, Connecticut, and Illinois in April to stop them from going after Kalshi and Polymarket, courts in Maryland and Massachusetts have sided with state regulators, Kalshi faces more than a dozen federal lawsuits, and CryptoSlate's reporting shows the same tension spreading abroad, from user probes in South Korea to platform blocks in Brazil.
The next ruling to watch comes from the Sixth Circuit, where Kalshi is appealing an Ohio decision that went against it, and the coalition lining up against the company there just increased.
Former CFTC Chairman Gary Gensler, who ran the agency when Dodd-Frank was implemented in 2010, filed an amicus brief on June 11 arguing Congress never intended his agency to become a national sports-betting regulator, and that sports bets are not swaps under the law he helped write.
He filed alongside the American Gaming Association, 30 Native American tribes, the Indian Gaming Association, and Better Markets. In a parallel Massachusetts case, 38 state attorneys general have already lined up behind the state.
The split also runs through the sportsbook industry itself. DraftKings and FanDuel quit the AGA in November 2025, days before DraftKings launched Predictions, after the trade group moved to bar members that operate prediction markets. The same association is now arguing in court that the product DraftKings just built is illegal gambling.
There's one more thing worth understanding before taking any of these numbers at face value: volume is how much money changes hands, but revenue is the small slice the platform keeps. The slice comes from fees of a few cents per contract, so a billion dollars in trading might produce only a few million in actual income.
The whole sector generated about $31 million in fees in April, and Polymarket collected $29 million of it despite trailing Kalshi badly on volume, because its traders place larger bets. DraftKings hasn't said how much its Predictions volume earns, so its $3.1 billion run-rate only measures traction, and the profit question stays open.
DraftKings' prediction markets growth is huge, and the 34% monthly jump is the kind of number that moves a stock. But the more important point is that legacy sportsbooks are following a category they didn't invent, one where Kalshi, Polymarket, and Robinhood have already shown that event contracts can generate billions in monthly volume and have spent years building both the trading depth and the legal arguments to defend it.
Whether DraftKings can turn its sports audience into exchange-style traders before those platforms grow too liquid to catch is the open question, and the answer will say a great deal about whether the sportsbook model absorbs prediction markets or gets absorbed by them.
The post Legacy sportsbooks are chasing prediction markets that already trade billions each month appeared first on CryptoSlate.
