Nyse

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Traders Douglas Glander (left) and Peter Mancuso (right) work on the floor of the New York Stock Exchange on Thursday, Dec. 6, 2012. (AP Photo/Richard Drew)

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**FILE** Traders work on the floor at the New York Stock Exchange in New York on Nov. 15, 2012. (Associated Press)

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Joseph Mastrolia (left), a trader with Barclays, and Chris Casaliggi, Euronext floor manager, begin early trading on the floor of the New York Stock Exchange on Nov. 20, 2012. (Associated Press)

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**FILE** Nicholas Briganti (center), governor of the New York Stock Exchange, works with traders on the floor of the Exchange on April 12, 2012. (Associated Press)

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Luke Scanlon (left) of MND Partners Inc., works Nov. 7, 2012, on the floor of the New York Stock Exchange in New York. (Associated Press)

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James Dresch of MND Partners Inc. works on the floor of the New York Stock Exchange the day after President Obama was re-elected, Wednesday, Nov. 7, 2012, in New York. (AP Photo/Henny Ray Abrams)

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A trader works on the floor of the New York Stock Exchange in New York on Wednesday, Nov. 7, 2012, the day after President Obama was re-elected. (AP Photo/Henny Ray Abrams)