Hedge fund Melvin Capital closed out its short position in videogame retailer GameStop Corp., CNBC reported Wednesday. Fund manager Gabe Plotkin told CNBC's Andrew Ross Sorkin that the position was closed out Tuesday afternoon following a huge loss. Shares of GameStop have soared more than 600% in January after retail investors, organized via Reddit's WallStreetBets forum and other platforms, sought to push up a handful of heavily shorted stocks. Hedge funds Citadel and Point72 infused nearly $3 billion into Melvin Capital to shore up the fund, news reports said earlier this week.