A social media-driven trading frenzy cooled further on Wednesday when US Treasury Secretary Janet Yellen called a meeting of senior officials that could result in tighter market regulation for hedge funds, small investors and brokers. Mass buying by amateur traders over the past two weeks caused fierce price swings at companies that US fund managers had bet against, including video game retailer GameStop and movie theater operator AMC Entertainment. . GameStop’s US-listed shares, which hit $483 last week, fueled by posts on the popular Reddit WallStreetBets forum, fell this week…

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