Take a look at some of Monday's midday movers:
Merck & Co. - The pharmaceutical giant gained after the release of data that showed its cholesterol drug significantly lowered the risk of heart attacks and strokes in patients at high risk.
Regeneron Pharmaceuticals - The drug developer climbed after saying its experimental drug was effective in reducing cholesterol for those who couldn't take statins.
Celldex Therapeutics - The drug maker rallied after it announced positive results of its treatment for a specific type of brain tumor.
Yahoo - The search engine was among the companies leading the way as the S&P Tech sector rose to a 14-year high.
CarMax - The used-car retailer dropped after Morgan Stanley downgraded its shares to equal weight from overweight.
Petrobras - Brazil's state-owned oil company continued to fall amid a widening corruption scandal.
Lockheed Martin - The defense contractor fell on reports Israel would order for its fighter jets would be smaller than thought.
CBS - The network fell moved lower after Evercore cut its price target on its shares.
Amicus Therapeutics - The drug developer gained after announcing positive results on its experimental treatment for Fabry disease.
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