In corporate news, Qualcomm ( QCOM ) rose today following reports activist investor Jana Partners is urging a breakup of the company. Stocks were cautiously higher Monday ahead of a slew of Q1 financial results from major banks later this week and a heavyeconomic calendarincluding data on inflation, manufacturing and the housing market. U.S. futures were defensive prior to today's open after a surprise plunge in China's trade surplus rekindled worries about sluggish global economic growth.