Philadelphia Stock Exchange options, and a number of FX options. The PHLX has more than 16% of United States market share in exchange-listed stock and ETF options trading. The exchange's normal trading sessions are from 9:30 am to 4:00 pm on all days of the week except Saturdays, Sundays and holidays declared by the exchange in advance. Philadelphia Stock Exchange Philadelphia Stock Exchange (PHLX), now known as NASDAQ OMX PHLX, is the oldest stock exchange in the United States. It is now owned by The NASDAQ OMX Group. Founded in 1790, the exchange was originally named the Board of Brokers of Philadelphia, also
National Stock Exchange (Jersey City, New Jersey) The other, associated with the New York Mercantile Exchange, traded from March 7, 1962 to January 31, 1975. National Stock Exchange (Jersey City, New Jersey) The National Stock Exchange (NSX) is an electronic stock exchange based in Jersey City, New Jersey. It was founded March 1885 in Cincinnati, Ohio, as the Cincinnati Stock Exchange. In 1995 it moved headquarters to Chicago, Illinois, and it was renamed the National Stock Exchange in 2003. After demutualizing in 2006, it moved headquarters to Jersey City. In 2011, CBOE Stock Exchange acquired the National Stock Exchange, with both exchanges operating under separate names. The