Kalshi Trading Volume Surges to $27 Billion During World Cup Amid Regulatory Scrutiny

Prediction market Kalshi saw trading volume soar to $27 billion during the 2026 FIFA World Cup, roughly double its internal projections, as the platform attracted millions of users to wager on the tournament's outcomes. The surge in activity comes as the company navigates significant legal and regulatory challenges in the United States.

World Cup Volume Exceeds Expectations

According to a source familiar with the matter cited by Reuters, Kalshi recorded approximately 3 million users and $27 billion in total trading volume throughout the global soccer tournament. These figures far surpassed the startup's expectations of 1.5 million users and $13 billion in volume.

The 2026 World Cup, which featured an expanded 48-team format and concluded with Spain defeating Argentina, was the most lucrative tournament in FIFA’s history. The strong user engagement highlights the growing appetite for event-based contracts tied to major global sporting events.

Regulatory Headwinds Intensify

Despite its recent growth, Kalshi faces mounting legal pressure. Critics contend that such platforms are effectively unregulated gambling operations, raising concerns about addictive behavior and the potential for market manipulation.

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The company is currently engaged in litigation with several states that allege it is violating local gaming laws. Earlier this week, Washington secured a court order to block Kalshi's operations in the state, with a judge ruling its "event contracts" likely violated state gambling laws. Massachusetts has also sought a similar injunction.

Separately, Reuters reported last week that federal regulators are investigating potential insider trading on the platform. Kalshi noted that it had initially flagged the suspicious activity to the Commodity Futures Trading Commission (CFTC) through its own market surveillance processes.

Market Context and Expansion

Prediction markets, which allow users to trade on the outcomes of future events from elections to economic data releases, have gained significant popularity since the 2024 U.S. Presidential election. The strong World Cup performance demonstrates the potential for these platforms to expand further into mainstream sports.

Looking ahead, Kalshi has announced plans to launch markets based on the outcomes of clinical drug trials and FDA regulatory reviews. This move would introduce event-based trading to the biopharmaceutical sector for the first time, making odds on drug development publicly tradable.