Kalshi Records $800M Surge From March Madness

Kalshi has reported more than $800 million in trading during the opening weekend of March Madness, making it a standout player. The figure nearly doubles the total volume recorded across the entire tournament period in 2025.

Last year, users traded $208 million during the first two rounds of the NCAA tournament. The latest numbers highlight how quickly participation has scaled within a single year.

March Madness, the NCAA Division I basketball championship, is one of the most watched sporting events in the United States. Its structure features 68 teams in high-stakes elimination rounds, attracting strong engagement from fans and traders.

Kalshi has leaned into that momentum with a headline contest offering $1 billion for a perfect men’s bracket. If no entry achieves that outcome, the top participant still receives $1 million.

Regulatory scrutiny intensifies around event contracts

The rise in trading activity has drawn attention from regulators and industry groups. The American Gaming Association estimates that traditional sports betting on March Madness could reach $3.3 billion this year, placing prediction markets in direct comparison with sportsbooks.

The NCAA has raised concerns about the impact of event-based trading on college sports, with its president Charlie Baker urging the CFTC to impose a temporary suspension on these activities.

An NCAA spokesperson warned of “unprotected markets” that could undermine competition integrity and student-athlete safety. While the regulator has updated its guidance, it has not publicly responded to the request.

Public perception continues shaping the debate, as many still view prediction markets as gambling, which affects adoption.

Competition grows as platforms expand reach

Kalshi is not the only platform benefiting from increased interest. Polymarket reported $200 million in trading volume during the same period, reinforcing the growing presence of event-contract platforms in sports betting.

Prediction markets operate differently from traditional sportsbooks. They function as financial exchanges where contracts reflect probability, while sportsbooks rely on wagers placed against a bookmaker.

Kalshi operates under federal regulation in the United States. Other platforms, including Polymarket, function in less defined legal environments, raising ongoing questions around enforcement.

Critics describe prediction markets as “sports betting in disguise,” a view that may influence future regulations.

Rapid expansion driven by retail and institutional interest

Kalshi’s growth trajectory has been steep. Within a year, the company’s valuation rose from $11 billion to $22 billion. It also recorded trading volumes exceeding $23.8 billion in 2025, representing a reported 1,100% increase.

Sports-related contracts accounted for 75% of activity, showing the importance of events like March Madness in driving engagement. Partnerships with firms such as Robinhood and CME Group have also strengthened its infrastructure.

Kalshi is attracting a mix of younger retail users and institutional participants. Many see prediction markets as a new financial category that blends trading with real-world events.