New York Stock Exchange (NYSE)
The world's largest stock exchange and the de facto center of the U.S. financial markets. Founded in 1792, the New York Stock Exchange merged with Archipelago (Arca) and the Pacific Stock Exchange (PCX) in 2006 to form the NYSE Group. NYSE Group operates two separate exchanges, the New York Stock Exchange and NYSEArca. The New York Stock Exchange operates from the floor of its Wall Street location as a hybrid system that combines an open-outcry auction with electronic trading. NYSEArca is a fully electronic exchange. On the Web at www.nyse.com.