Kalshi reported more than $2.5 billion in total notional trading volume across its election markets during the 2026 U.S. midterm cycle, nearly doubling the $1.3 billion recorded during the 2024 presidential election. The figures, released on November 4, 2026, underscore the rapid expansion of regulated prediction markets as a venue for political forecasting and signal a structural shift in how market participants price electoral outcomes.
Record Volume Across Election Contracts
The $2.5 billion figure represents aggregate trading across Kalshi’s full suite of midterm-related contracts, including markets on House and Senate control, individual races, and state-level outcomes. All 435 House seats and 35 Senate seats were available for trading on the platform.
The growth is notable given the historical pattern of midterm cycles attracting less speculative interest than presidential elections. Volume on election-related markets had been largely flat through much of the two-year period between national votes, making the late-cycle surge particularly pronounced.
Competitor platforms also saw substantial activity. Polymarket reportedly generated roughly $600 million across more than 7,000 election-related markets during the cycle, though its figures include pre-election activity on platforms operating under different regulatory frameworks.
Accuracy and Speed of Results
Kalshi stated that its traders correctly called approximately 98 percent of the 2026 midterm races, and that contract pricing signaled outcomes on House and Senate control hours before official network projections. The company attributed the speed to continuous, real-money pricing that updates as results are reported.
However, the cycle was not without misses. Reporting noted at least one high-profile race in which a candidate’s victory defied market odds, a reminder that prediction markets remain probabilistic instruments rather than guarantees.
Industry observers point to several factors behind the volume increase, including significant advertising spending by prediction market operators, content partnerships with news organizations and sports leagues, and broader mainstream acceptance of event contracts as a financial product class.
Kalshi operates as a regulated exchange under oversight of the Commodity Futures Trading Commission (CFTC), a distinction that has shaped its positioning relative to platforms operating in regulatory gray areas. The company’s expansion into political markets has coincided with broader growth in event contracts covering economics, weather, and cultural outcomes.
