Pedestrians pass a GameStop store on 14th Street at Union Square, Thursday, Jan. 28, 2021, in the Manhattan borough of New York. GameStop stock has rocketed from below $20 to more than $400 this month as a volunteer army of investors on social media challenged big institutions who has placed market bets that the stock would fall. (AP Photo/John Minchillo)A Minnesota man has cashed in on his GameStop investment. GME is the symbol for GameStop stock. He’s comfortable on Reddit, the home of the online forum called Wall Street bets, that helped propel GameStop stock to its dizzying heights.