The New York Stock Exchange (NYSE) is a stock exchange based in New York City that is considered the largest equities-based exchange in the world, based on total market capitalization of its listed security. Formerly run as a private organization, the NYSE became a public entity in 2005 following the acquisitionr parent company of electronic trading exchange Archipelago. The p of the New York Stock Exchange is now called NYSE Euronext, following a merger with the European exchange in 2007; the NYSE Euronext was acquired by Intercontinental Exchange.