Stocks opened sharply lower Wednesday following the previous session's sharp rally as investors remained cautious over the prospects for the U.S. economy and the ongoing euro zone crisis.

The Dow Jones Industrial Average tumbled at the open after surging over 600 points in the final hourof trading in the previous session amid a heavily volatile session.

Here are six stocks that are on the move:

Nestle
The Swiss food producer raised its full year outlook today thanks to strong demand in emerging markets.

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Altria
The tobacco company was upgraded to buy from neutral at Davenport.

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Capital One
The financial services firm was a rare gainer in financials — in the green after saying it's buying HSBC's U.S. credit card operations.

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General Electric
The technology and financial services corporation was added to the top picks list at Citigroup because of high recurring revenues.

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SunPower
The solar company traded lower after reporting a loss for the second quarter of nineteen cents a share.

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Pfizer
The pharmaceutical corporation was upgraded to buy from hold at Argus.

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