NEW YORK - DECEMBER 20: Flags hanging from the New York Stock Exchange (NYSE) building are the backdrop for a Wall St. street sign December 20, 2006 in New York City. The NYSE Group Inc. approved the $14.6 billion purchase of Euronext NV, making the way for the creation of a global securities market. Euronext N.V. , a holding company incorporated under Dutch law that operates through local subsidiaries, was formed on September 22, 2000 when the exchanges of Amsterdam, Brussels and Paris merged.