Exchange group NYSE Euronext (NYX.N) (NYX.PA) beat expectations on Tuesday when reporting quarterly profit fell 21 percent, reflecting weaker trading activity amid growing competition. The Big Board parent company earned $120 million, or $0.46 per share, in the fourth quarter of 2010, down from $151 million, or $0.58, a year ago. Revenue dropped 4 percent to $613 million.
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