GameStop, AMC shares jump another 40% in premarket trading as meme stock craze returns CNBCGameStop stock spikes after post from investor who led 2021 frenzy The Washington PostDow Jones Futures: Nvidia’s New Buy Point; GameStop Extends 74% ‘Roaring Kitty’ Surge Investor’s Business DailyGameStop Shares Surge Again as Meme-Stock Phenomenon Returns Yahoo FinanceGME: GameStop Shares Jump 75% After ‘Roaring Kitty’ Makes Surprise Comeback TradingView