Copies of ‘Grand Theft Auto V’ on display for sale at a GameStop store in Peru, Illinois. Daniel Acker | Bloomberg | Getty Images The explosive rally in GameStop is showing no signs of slowing down as retail investors talking in chat rooms and hedge funds rushing to cover their short bets against the stock pushed it above $120 a share at one point Monday. Shares of the brick-and-mortar video-game retailer soared more than 140% to $159.18 at its high of the session in morning trading. The stock was briefly…

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