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In 2016, while Tarek Mansour was an analyst at Goldman Sachs, he watched clients nervously trying to hedge their investments in case the Brexit referendum passed. They had no direct way to do it, and the insight became the seed for a startup idea—Kalshi, an exchange where investors could make unusual bets on future events. He cofounded the New York company with fellow MIT alum Luana Lopes Lara in 2018.