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NYSE Euronext (NYSE Euronext: NYX) has announced that Lawrence Leibowitz has been appointed Executive Vice President and Chief Operating Officer, U.S. Products, NYSE Group, Inc., effective July 9, 2007. Mr. Leibowitz will have responsibility for business and product development for the U.S. cash markets. He will work closely with Duncan L. Niederauer, President and co-Chief Operating Officer, NYSE Group and a member of NYSE Euronext Management Committee, who is head of U.S. Cash Markets.