NBA Confirms Giannis Kalshi Stake Falls Within League Rules

NBA commissioner Adam Silver said the league permits limited player investment in prediction market companies, addressing questions after Milwaukee Bucks forward Giannis Antetokounmpo became a shareholder in Kalshi earlier this month.

Good to Know

• NBA rules allow players to hold very small stakes in betting related businesses under collectively bargained guidelines.
• Silver said Antetokounmpo investment was far below the 1 percent ownership threshold allowed by league policy.
• League leadership continues monitoring prediction markets closely as legal battles unfold across the United States.

Silver explained during All Star Weekend that current labor agreements already address situations involving ownership in wagering companies, and the league is treating prediction platforms under the same framework.

“We have a rule that was collectively bargained with the Players Association that players can make, I will call them, de minimis investments in sports betting companies, and we’re applying the same rule to prediction markets,” Silver said, per the Sports Business Journal. “That means their investment cannot amount to over 1%. In the case of Giannis, from what I understand, it’s a minuscule investment, much smaller than 1%. So that does not violate the rules that have been collectively bargained with the Players Association.”

Antetokounmpo therefore did not breach league policy when taking an ownership position in the federally regulated trading platform, according to Silver.

Kalshi reached a valuation exceeding 11 billion dollars in late 2025, with trading volumes expanding rapidly as event based contracts draw increased participation.

Prediction Platforms Now Sit Near Traditional Sportsbooks

Silver acknowledged that prediction markets are entering territory historically occupied by regulated sportsbooks, raising new questions for leagues tasked with protecting competitive integrity.

“Obviously, it’s an issue that I’m paying enormous amount of attention to,” Silver said. “It’s rapidly evolving. Prediction markets have now come on the scene fairly recently as, I don’t know how else to say it, major sports betting marketplaces.”

Antetokounmpo became the first active NBA player publicly linked to an ownership stake in such a platform. The disclosure followed Kalshi decision to close a market speculating on which team he might join after the trade deadline, an episode that fueled debate about potential conflicts.

Silver indicated that ultimate clarity will not come from leagues themselves but from federal policymakers and the judiciary as disputes between regulators continue.

“Whether prediction markets are allowed to go forward in the form they’re in now will, I think, be ultimately an issue for the courts and for Congress,” Silver said.

That uncertainty mirrors ongoing legal clashes involving federal derivatives oversight and state level gambling enforcement, leaving professional leagues in a wait and see position while rules evolve.

Silver also raised concerns about wagering activity outside the United States, noting that global betting markets tied to NBA games may lack consistent safeguards.

“It concerns me in the totality of all this betting that we need a better handle, no pun intended, on all the different activity that’s happening out there,” Silver said. “There’s been some – Sportradar is a company we deal with now. There’s others, massive database companies that are looking at getting into this business for all leagues. So there are ways that you can, in essence, scrape the internet – I don’t know a better way to say it – for whatever chatter is happening out there and try to pick up all the markets, legal and illegal, to see whatever aberrant behavior is out there. So I’m paying a lot of attention to that.”