The New York Stock Exchange (NYSE, nicknamed "The Big Board") is an American stock exchange in the Financial District of Lower Manhattan in New York City. 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 at the New York Stock Exchange Building on 11 Wall Street and 18 Broad Street and is a National Historic Landmark. An additional trading room, at 30 Broad Street, was closed in February 2007.
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 relied for many years on floor trading only, using the open outcry system. Many NYSE trades have transitioned to electronic systems, but floor traders are still used to set pricing and deal in high-volume institutional trading.
Currently, the NYSE is open for trading Monday through Friday from 9:30 a.m. to 4:00 p.m. ET. The stock exchange is closed on all federal holidays. When federal holidays fall on a Saturday, the NYSE is sometimes closed the preceding Friday. When the federal holiday falls on a Sunday, the NYSE may be closed the following Monday.
According to Wikipedia