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“Dan Gallagher, Robinhood’s chief legal officer, is a former S.E.C. commissioner who joined the company in May, 2020. He described the GameStop frenzy as a ‘five-sigma event’—something freakish that had only a one-in-3.5 million probability of happening.” newyorker.com/magazine/2021/05/17/robinhoods-big-gamble