Prediction markets recorded $12.33 billion in trading volume for October, with Kalshi accounting for approximately 80%.

Artemis data shows that the market’s total trading volume for October is projected to reach $12.33 billion, marking the first breakout past the $10 billion threshold and rising approximately 53.9% from the all-time high recorded in September; the number of trades for the month stood at 642.9 million. Breaking it down further, Kalshi contributed $9.82 billion in trading volume (approximately 80% of the total), corresponding to 465.5 million trades; Polymarket achieved $2.02 billion in trading volume, with 148 million trades. The core driver of growth was parlay products spurred by the football season—which accounted for 67.6% of Kalshi’s monthly trading volume—and most related contracts traded below $0.01. It should be noted specifically that Kalshi counts each contract’s full $1 payout value toward its trading volume statistics, a figure that does not equate to the total amount of funds users actually invested. Additionally, trading volume for U.S. midterm election-related markets has exceeded $1.4 billion.