The New York Stock Exchange (NYSE) is a stock exchange located at 11 Wall Street in lower Manhattan, New York City, USA. It is the world's largest stock exchange by market capitalization of its listed companies at US$12.25 trillion as of May 2010. Average daily trading value was approximately US$153 billion in 2008. The NYSE is operated by NYSE Euronext, which was formed by the NYSE's 2007 merger with the fully electronic stock exchange Euronext. The NYSE 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, as was the 11 Wall Street building.