Kalshi, a prediction market that allows people to bet on future events, has raised a massive $1 billion round at a $11 billion valuation, according to a person familiar with the deal. The round comes less than two months after the seven-year-old startup announced its previous fundraise of $300 million at a $5 billion valuation. The latest round is led by the company’s returning investors Sequoia and CapitalG, the person said. Other investors in Kalshi include Andreessen Horowitz, Paradigm, Antho...