Cramer warns against ‘meme stock mania,’ says to sell GameStop and AMC CNBCGameStop stock gains nearly 60% as meme-stock market returns with a vengeance Yahoo FinanceGameStop’s stock surge continues, punishing short sellers Fox BusinessGameStop, AMC Meme Stock Mania, and ‘Roaring Kitty’ Are Back and Hitting Short Sellers Hard – WSJ The Wall Street JournalSunPower, BlackBerry Surge as Most-Shorted Meme Stocks Fly With AMC, GameStop Barron’s