The New York Stock Exchange (NYSE), nicknamed the "Big Board," is a New York City-based stock exchange. It is the largest stock exchange in the world by dollar volume and, with 2,764 listed securities, has the second most securities of all stock exchanges. It's the second biggest stock exchange in the world in terms of company listings only next to NASDAQ with 3,200 companies, before Bombay Stock Exchange (BSE) of India, consolidated this position as the biggest stock exchange in the world with a company listing of 4,800 as of August 2007. As of December 31, 2006, the combined capitalization of all New York Stock Exchange listed companies was $25.0 trillion.

The NYSE is operated by NYSE Euronext, which was formed by the NYSE's merger with the fully electronic stock exchange Archipelago Holdings and Euronext. The New York Stock Exchange trading floor is located at 11 Wall Street, and is composed of four rooms used for the facilitation of trading. A fifth trading room, located at 30 Broad Street, was closed in February 2007. The main building, located at 18 Broad Street between the corners of Wall Street and Exchange Place, was designated a National Historic Landmark in 1978. National Park Service, blank">National Historic Landmarks Survey, New York, retrieved May 31, 2007.

NYSE Group merged with _Euronext, and many of its operations (particularly IT and the trading platform) will be combined with that of the New York Stock Exchange and NYSE Arca.