[Kalshi and Polymarket Reach Record $1.44 Billion in Trading Volume in September] In September, the combined trading volume of prediction market platforms Kalshi and Polymarket reached $1.44 billion, setting a new historical record. Polymarket secured $2 billion in funding from Intercontinental Exchange, with a valuation of $9 billion; Kalshi raised $300 million at a valuation of $5 billion. Polymarket founder Shane Copeland thus became the youngest self-made billionaire. During September, Kalshi's market share temporarily accounted for 60%, reversing the previously Polymarket-dominated landscape.