Take a look at some of Monday's midday movers:
SanDisk - The flash memory provider fell sharply after saying fourth-quarter revenue would come in below its previous forecast. Rival Micron Technology also fell.
SAP - The business software provider gained after it reported better-than-expected fourth-quarter results. Rival Oracle came off its lows on the news.
Chevron - The oil producer and others including Exxon Mobil fell with the price of crude. Anadarko Petroleum, Hess and ConocoPhillips also declined.
Google - The search engine dropped after Atlantic Equities downgraded the stock to neutral from overweight.
Express - The specialty apparel and accessory retailer rose after increasing its fourth-quarter and full-year profit forecasts.
American Airlines Group - The carrier declined after reporting a decline in revenue per passenger mile in December.
MWI Veterinary Supply - The distributor of animal-health products rose after AmerisourceBergen said it would buy the company for about $2.5 billion.
CBS - The network moved a bit higher after Cowen upgraded the stock to outperform.
ConAgra Foods - The food distributor declined after Citigroup downgraded the stock to neutral from buy.
Kellogg - The cereal maker fell after Citigroup downgraded the stock to neutral from buy.
Mondelez International - The supplier of snacks and beverages lost ground after Citigroup downgraded the stock to neutral from buy.
EMC - The provider of data and security gained after reaching a standstill agreement with activist investor Elliott Management.
Celgene - The biopharmaceutical company rose after offering a better-than-expected fourth-quarter earnings outlook.
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