Kalshi, a prediction market platform, has raised $1 billion, boosting its valuation to $11 billion. This funding round follows a $300 million raise just two months earlier when Kalshi was valued at $5 billion. Major investors include Sequoia and CapitalG, alongside others like Andreessen Horowitz and Paradigm. This surge in investment highlights growing interest in prediction markets, particularly after Kalshi's success in forecasting outcomes of significant political events, including the recent New York City mayoral election. Kalshi allows users in over 140 countries to bet on a wide array of future events, from entertainment outcomes to political races. The company has seen a dramatic increase in trading volume, hitting $50 billion in annualized volume, a significant jump from $300 million the previous year. Co-founders Tarek Mansour and Luana Lopes Lara, both MIT alumni and former hedge fund traders, founded Kalshi to navigate the complex legal landscape surrounding prediction markets, which often blur the lines between financial instruments and gambling. While Kalshi has gained legal ground by securing the right for U.S. users through a successful lawsuit against the Commodity Futures Trading Commission (CFTC), it still faces challenges with state regulators who argue its operations constitute illegal gambling. In contrast, its main competitor, Polymarket, has been barred from serving U.S. residents since 2022 but is working on reentering the market after acquiring a derivatives exchange. The competitive dynamics between Kalshi and Polymarket illustrate the evolving nature of prediction markets amid regulatory scrutiny.