CHICAGO, IL - FEBRUARY 11: The Chicago Board of Trade building towers over the south end of LaSalle Street on February 11, 2011 in Chicago, Illinois. The building is home of the CME Group which was ... more 
CHICAGO, IL - FEBRUARY 11: The Chicago Board of Trade building towers over the south end of LaSalle Street on February 11, 2011 in Chicago, Illinois. The building is home of the CME Group which was formed following the merger of the Chicago Mercantile Exchange and the Chicago Board of Trade. Built in 1930 the building was the tallest in Chicago until 1965. Following the announcement of a potential merger between NYSE Euronext and Deutsche Borse, analysts are speculating if the CME Group, Nasdaq, or the CBOE would search for merger partners. (Photo by Scott Olson/Getty Images) less 
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Getty Images | Photo By Scott Olson / Getty Images
Fri, Feb 11, 2011 6:39 PM EST