The New York Stock Exchange (NYSE, nicknamed "The Big Board") is an American stock exchange located at 11 Wall Street, Lower Manhattan, New York City, New York. It is by far the world's largest stock exchange by market capitalization of its listed companies at US$30.1 trillion as of February 2018. The average daily trading value was approximately US$169 billion in 2013. The NYSE trading floor is located at 11 Wall Street and is composed of 21 rooms used for the facilitation of trading. A fifth trading room, located at 30 Broad Street, was closed in February 2007. The main building and the 11 Wall Street building were designated National Historic Landmarks in 1978. The NYSE is owned by Intercontinental Exchange, an American holding company that it also lists (NYSE: ICE). Previously, it was part of NYSE Euronext (NYX), which was formed by the NYSE's 2007 merger with Euronext.The NYSE has been the subject of several lawsuits regarding fraud or breach of duty and in 2004 was sued by its former CEO for breach of contract and defamation.
The main New York Stock Exchange Building, built in 1903, is at 18 Broad Street, between the corners of Wall Street and Exchange Place, and was designed in the Beaux Arts style by George B. Post. The adjacent structure at 11 Wall Street, completed in 1922, was designed in a similar style by Trowbridge & Livingston. The buildings were both designated a National Historic Landmark in 1978. 18 Broad Street is also a New York City designated landmark.