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Stocks to Watch: RailAmerica, Hewlett-Packard, BHP Billiton and More...

Stocks turned negative in another choppy session Thursday. Wall Street cheered as Berkshire Hathaway said it will invest $5 billion in Bank of America, but remained concerned ahead of Bernanke's Jackson Hole speech at the end of the week.

The Dow Jones Industrial Average turned negative after logging a three-day rally in the previous session.

Here are five stocks that are on the move:

The railroad operator was upgraded to buy from hold at Stifel Nicolaus.


The computer company was downgraded to sector perform from outperform at RBC Capital on fears of brand deterioration.


American Eagle Outfitters
The apparel retailer was upgraded to neutral from sell at Lazard Capital markets citing a balanced risk vs. reward environment.


BHP Billiton
The natural resources company was upgraded to buy from hold at Societe Generale on valuation.


Sanderson Farms
The poultry processing company was upgraded to overweight from equal weight at Stephens.


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