DraftKings' new exchange took roughly 3%, a gap of about 25 to 1 that shows how quickly the category has consolidated.
The fight for football prediction traders is, for now, not close. Kalshi handled about 76% of prediction-market volume on the NFL's opening week, according to data compiled by Needham, while DraftKings' new DKeX exchange took about 3%.
Needham also calculated a consumer-equivalent figure, which adjusts for differences in how platforms count trades. On that basis, Kalshi's share was about 67%. Either way, the leader's volume was roughly 25 times that of DraftKings' entry on the raw measure.
Why the gap is so wide
The numbers highlight the advantage of an early start. Kalshi built a national sports contract business while traditional sportsbooks were still deciding whether to enter the category, and it has spent heavily on legal defense to keep those contracts available. DraftKings has the larger customer base in traditional wagering, but converting sportsbook users to exchange-style trading requires a different product and, in many states, a different legal footing.
The split also suggests that prediction-market users are not simply sportsbook customers with a new interface. If they were, the incumbent with the biggest existing audience would be expected to capture a larger share quickly.
Legal risk to the leader
Kalshi's dominance comes with exposure. On Friday, a federal appeals court ruled that its sports contracts are subject to state gambling law in Ohio and Tennessee. The more of Kalshi's volume that runs through sports, the more that ruling and others like it could affect its business in states where regulators choose to act.
That creates a potential opening for incumbents. Established sportsbooks already hold state licenses, which could become more valuable if courts continue to side with the states. A 3% share today is a weak starting point, but a legal regime that favors licensed operators would change the competitive math.
What to watch
The next marker is whether DKeX gains share as the season progresses and whether Kalshi's lead narrows in states where its legal position has weakened. Any shift in how Kalshi structures or restricts its sports offerings in the Sixth Circuit's states would be the first concrete sign of the ruling reaching volumes.