The sports world and prediction market worlds collided ever further as Milwaukee Bucks superstar Giannis Antetokounmpo publicly announced he was now a shareholder of Kalshi, the prediction market platform that trades heavily in sporting event outcomes. Much to the angst of many sports media commentators, one of the most recent event prediction outcomes on Kalshi was Antetokounmpo’s own fate leading up to the NBA trading deadline. To put it more bluntly, Antetokounmpo was now the part-owner of a platform taking “bets” on where Antetokounmpo himself would end up after the trading deadline passed. The appearance of “insider trading” rankled many pundits. (“Bets” is in parentheses because Kalshi refers to event outcome contracts as “trading”, not betting, though many in the sports betting community claim little to no practical difference.)
It should be noted that Giannis Antetokounmpo is not accused of breaking any law, nor any rules within the NBA collective bargaining agreement, which outlines do’s and don’ts for NBA players as it relates to their off-court personal and business dealings. The NBA allows players to take up to a 1% interest in companies that may be related to sports events, provided the investments are passive, with zero management control. Kalshi was recently valued at $11 billion, so presumably Giannis Antetokounmpo’s investment was under $100 million. These player deals with gaming companies and similar tend to be more focused on marketing value than investor need. Giannis Antetokounmpo will be a major asset to Kalshi’s sports event contract areas, which, as with all prediction platforms in North America, remain its largest.
NBA Embroiled in Gambling Scandals
But the Giannis Antetokounmpo deal, and the timing of it as it relates to the event contract of his trade deadline outcome, which traded over $24 million in speculation, raised the specter of trouble the NBA has had in recent years as it relates to corruption through gambling interests:
| Scandal | Description |
|---|---|
| 2007 Tim Donaghy Betting Scandal | Veteran NBA referee Tim Donaghy was exposed by an FBI investigation for betting on games he officiated from 2003 to 2007, including adjusting foul calls to influence point spreads. He pleaded guilty to wire fraud and transmitting wagering information, leading to a 15-month prison sentence and raising widespread concerns about officiating bias. |
| 2024 Jontay Porter Lifetime Ban | Toronto Raptors player Jontay Porter was banned for life by the NBA after an investigation revealed he shared confidential health information with bettors, bet on league games himself, and intentionally limited his participation (e.g., feigning illness to exit early) in at least two games to hit “under” prop bets on his stats. |
| 2025 Terry Rozier Arrest and Performance Manipulation | Miami Heat guard Terry Rozier was arrested as part of an FBI probe into an illegal betting scheme, accused of sharing insider injury information and removing himself early from at least one game (against the New Orleans Pelicans in February 2023) to ensure “under” prop bets on his performance paid off, profiting gamblers who wagered over $200,000. |
| 2025 Broader NBA Insider Betting and Mafia-Linked Scheme | A wide-ranging FBI indictment implicated multiple NBA figures, including former player Damon Jones and coach Chauncey Billups, in a conspiracy using non-public lineup and injury info (e.g., tipping LeBron James’ absence before public announcement) to place fraudulent bets on at least seven games from 2023-2024, with ties to organized crime and performance tweaks to rig outcomes. |
One of the legitimacy questions around prediction markets remains: how can you have a fair event outcome prediction market if people directly related to that same outcome can buy into the event outcome itself? Or, sharing information with friends and associates about the outcome. Sometimes it’s even errant, where Spotify accidentally published early results on their site of a prediction event related to Drake and The Weeknd’s album results. Whether sports betting or prediction sites, there has to be some belief that all sides to the gamble are operating with equal information and opportunity. The reputation of these sports and platforms that create predictions around them relies on this belief.
Ultimately, given that no laws or player agreements are being violated, there’s little to be done here unless the Commodity Futures Trading Commission (CFTC), which has regulatory oversight of prediction platforms in the United States, steps in with a new ruling. But public pressure is another matter. This Giannis Antetokounmpo matter sparked some immediate backlash on social media from people questioning the appearance, at least, of impropriety. Though with the built-in understanding that Antetokounmpo is a very wealthy and established man, unlikely to be dabbling in insider trading or fixing betting outcomes. Certainly, if he were involved in such matters, he wouldn’t be drawing attention to himself so overtly in social media posts.
This athlete’s partnering with prediction platforms story is far from over. Stay tuned.
