How r/WallStreetBets took down a hedge fund and rode GameStop

Bets against GameStop’s stock, followed by a campaign to juice the video-game chain’s shares, sent its stock price soaring before it tumbled Thursday when trading app Robinhood banned purchases. © Janet Loehrke illustration on Gamestop stock The phenomenon involves two trends championed by individual investors in recent months — options trading and momentum investing — that…

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