Take a look at some of Tuesday's midday movers:
ExamWorks Group - The provider of medial exams and bill reviews fell after offering 3.1 million shares of stock at $33.90.
Halozyme Therapeutics - The drug developer gained after saying it was closer to reopening a study of pancreatic cancer treatment that was halted by federal regulators last month.
J.C. Penney Company - The retailer jumped ahead of its earnings report on Thursday.
Microsoft - The software maker gained after saying it would cut the cost of its Xbox One gaming console by $100.
Whirlpool - The appliance maker fell after Longbow downgraded it to neutral from buy.
W.W. Grainger - The distributor of maintenance and repair supplies declined after reporting April sales rose by 5 percent.
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—By CNBC's Rich Fisherman.
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