Tony Bartel

GameStop Corp., faced with a shrinking core business selling video games, is accelerating its effort to diversify by adding to its stores that offer AT&T Inc. wireless plans and acquiring other technology retail chains. The Grapevine, Texas-based company, which won court approval to take over 163 locations from bankrupt RadioShack Corp., is looking for acquisitions, Chief Operating Officer Tony Bartel said in an interview Thursday after reporting fourth-quarter results. The retailer is evolving into a holding company for a variety of store concepts, he said.