GameStop to Offer Up to $1 Billion in Shares; Stock Declines SYNDICATED A week ago (Bloomberg) -- GameStop Corp. fell early on Monday after the company said it may sell up to $1 billion worth of additional shares in an at-the-market equity offering program.Shares of the video game retailer declined more than 15% to $160.96 as of 7:19 a.m. in New York. Jefferies will manage the offering of up to 3.5 million shares, according to a statement, and proceeds will be used to further accelerate its corporate...