The company said it would sell up to 3.5 million shares and use the proceeds to speed up the shift in its business model to e-commerce in an overhaul being led by top shareholder and board member Ryan Cohen.
GameStop's stock has gained more than 900% so far this year, giving the company a valuation of as much as $34 billion at one point as retail traders bet against Wall Street hedge funds that had shorted its shares.
GameStop was trading 14.5% higher at $282.73 before the bell, on course for a sixth straight session of gains, while shares of cinema operator AMC Entertainment rose 10% and headphones maker Koss Corp soared about 40%.
GameStop retains a legion of devout followers after a social media frenzy in January triggered a massive rally in which its shares surged more than 1,600%.
The videogame retailer, the initial trigger for the market slugfest after gaining popularity on social media platform Reddit’s WallStreetBets, closed up 19.20% at $63.77 after hitting a session high of $95, although the wild gyrations seen in the past two weeks appeared to be easing.
GameStop had 27.13 million shares shorted, down 35 million over the prior week, according to Ihor Dusaniwsky, managing director of predictive analytics at S3 Partners.
Still, GameStop short interest stood at $8.82 billion as of Friday, making it the sixth-biggest short by value, according to S3.