Air Methods jumped after the air medical emergency transport services company raised its second-quarter guidance.
Agrium rose after the company raised its second-quarter and fiscal first-half earnings guidance. Other fertilizer stocks, including CF Industries, Potash and Mosaic were also higher.
Amphenol rose after the electronics-equipment maker raised its 2012 estimates.
Interactive Brokers lost ground after it warned on its conference call that it will continue to face strong headwinds for at least another couple of quarters.
St. Jude Medical slid after the heart device maker dialed back its outlook for the third quarter and the full year.
Mednax fell after Deutsche Bank downgraded the health-care provider to "sell" from "hold" and dropped its price target to $58 from $73. Mednax specializes in intensive care for critically ill pregnant women and newborns.
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