The bosses of Robinhood, Citadel, Melvin Capital and Reddit will testify next week at a House hearing about the wild trading involving GameStop and other stocks. Citadel’s Ken Griffin, Robinhood’s Vlad Tenev, Melvin Capital Management chief Gabriel Plotkin, Reddit co-founder Steve Huffman, and Keith Gill, a Reddit user credited with sparking GameStop’s rally who’s known by…

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