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
Chicago Stock Exchange 2014, bringing the number of active stock exchanges in the United States to 11. Wrote "Bloomberg", that left "just one public exchange, Chicago Stock Exchange Inc., that isn't owned Bats, Nasdaq OMX Group or IntercontinentalExchange Group Inc." On 5 February 2016, Chongqing Casin Enterprise Group, a Chinese led investment group, entered into a definitive agreement to acquire CHX Holdings, Inc., the parent corporation of the Chicago Stock Exchange, for an undisclosed amount, which is subject to regulatory approvals. The privately held Casin Group was founded in 1997. A minority ownership position is held by Bank of America, E-Trade, Goldman Sachs