— BlackBerry maker Research in Motion dropped $2.21, or 15.8 percent, to $11.74. The company said it won't generate as much revenue from telecommunications carriers once it releases the BlackBerry 10.
— Nike, the world's largest maker of athletic gear, jumped $6.10, or 6.2 percent, to $105.10. It said strong demand in North America led to a 7 percent increase in revenue in the three months ended Nov. 30, balancing out economic weakness in Europe and a slowdown in growth in China.
— Micron Technology dropped 6.9 percent, the biggest decline in the S&P 500 index. The semiconductor maker reported a loss late Thursday as weaker demand for personal computers and an oversupply of certain chips hurt its sales. The stock lost 47 cents to $6.32.
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