Not just the London Exchange . . .
Euronext merged with NYSE Group, Inc. on April 4, 2007 to form NYSE Euronext (Euronext: NYX), the "first global stock exchange".
Euronext N.V. is a European electronic stock exchange based in Amsterdam, Netherlands, and with subsidiaries in Belgium, France, Netherlands, Portugal and the United Kingdom. In addition to equities and derivatives markets, the Euronext group provides clearing and information services. As of December 2010, markets run by Euronext had a market capitalization of US$2.93 trillion, making it the 5th largest exchange in the world. Wiki