NYSE Euronext is a trans-Atlantic stock exchange group formed in 2007 after the merger of the New York Stock Exchange (NYSE) and Euronext. It is the world’s largest stock exchange group, with a market capitalization of over $20 trillion. NYSE Euronext operates exchanges in the United States, Europe, and the Middle East, and provides trading, clearing, and settlement services for stocks, options, futures, and other financial instruments.