The meme action group, led by video game retailer GameStop Corp. GME,
which have been volatile in recent weeks as investors from a Reddit subgroup on Monday helped each other. Shares of GameStop rose 5% ahead of the market, while shares of AMC Entertainment Holdings Inc. AMC,
the largest film chain in the world increased by 12%. BlackBerry Ltd BB,
increased 3.8%, and Naked Brand Group Ltd. NAKD,
rose 9.5%. Koss Corp. KOSS,
headphone manufacturer, up 2.9%. GameStop shares have gained 440% over the year so far as investors on Reddit’s WallStreetBets platform tried to punish short sellers who had increased interest in the shares to 140% by buying the shares. and creating a short budget.