Shares of Qualcomm (QCOM) were up nearly 5% in midday trading Thursday, after the cellular chip company late Wednesday posted quarterly results with an upside surprise. Qualcomm beat estimates and raised guidance for 2013, based on strong sales of smartphones that use its chips and technology. "Qualcomm is building a significant lead vs. the competition and establishing a clear 2013 road map, with no comparable competitive chip offering on the