Spanish football club Club Atlético Osasuna has recently become embroiled in a controversy surrounding the prediction market platform Kalshi. Earlier market reports indicated that a Kalshi contract associated with the club saw a rapid surge in trading volume, reaching approximately $591,600. The market predicted the club's potential relegation from La Liga in the 2025-2026 season, sparking speculation that the club might be using "reverse betting" to hedge against the revenue risk of relegation.
In response, Osasuna publicly denied any direct participation in predictive market transactions, emphasizing that it "has never placed a bet on Kalshi or any similar platform." The club also confirmed it had purchased approximately €1.2 million in relegation risk insurance through brokerage firm Howden. Kalshi, for its part, stated that the event is more akin to the redistribution of traditional insurance risk within a prediction market: the insurance broker bears the hedging risk, rather than the club directly engaging in transactions, describing the structure as functionally similar to a reinsurance mechanism.
Notably, despite suffering a loss in a crucial match, Osasuna ultimately managed to avoid relegation as its rivals failed to surpass them in points.
The incident has also sparked debate over the boundaries of prediction market use cases: it is evolving from a speculative tool into a real-world risk hedging instrument, potentially playing an "insurance-like" role in sports finance.
Meanwhile, the Spanish Ministry of Consumer Affairs has launched a regulatory investigation into Kalshi and Polymarket, demanding the temporary blocking of the relevant platforms for operating without a license. However, officials emphasized that this action is not directly related to the Osasuna incident. (Fortune)