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A company that owns and operates a number of stock exchanges in Europe. It was formed in 2000 with the merger of the Amsterdam, Brussels and Paris Bourses. The following year, it acquired LIFFE and in 2002 merged with the exchange that became Euronext Lisbon. In 2007, it merged with the New York Stock Exchange to form NYSE Euronext. Euronext provides common trading and clearing for all securities traded on any exchange it operates. It is known for publishing the Euronext 100, a major stock index.