It is by far the world's largest stock exchange by market capitalization of its listed companies at US$20 trillion as of June 2016. 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 New York Stock Exchange is closed on New Years Day, Martin Luther King, Jr. Day, Washington's Birthday, Good Friday, Memorial Day, Fourth of July, Labor Day, Thanksgiving and Christmas. When those holidays occur on a weekend, the holiday is observed on the closest weekday. In addition, the Stock Exchange closes early on the day before Independence Day, the day after Thanksgiving, and the day before Christmas. The NYSE averages about 253 trading days per year.
According to wikipedia