Philadelphia Stock Exchange 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 referred to as the Philadelphia Board of Brokers. In 1875, the Board of Brokers changed its name to the Philadelphia Stock Exchange. The exchange merged with the Baltimore Stock Exchange in 1949 and was named the Philadelphia-Baltimore Stock Exchange. It merged with the Washington Stock Exchange in 1954, becoming known as the Philadelphia-Baltimore-Washington Stock
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