Philadelphia Stock Exchange that the tax was illegal, and the PHLX moved its trading floor back to its headquarters in the city. In 1981, the exchange moved to 19th and Market, where it stayed until 2017 when it moved to its current location in the newly built FMC Tower. The exchange merged with the Baltimore Stock Exchange in 1949. The exchange was then named the Philadelphia-Baltimore Stock Exchange. The Baltimore Stock Exchange then migrated out of its Baltimore Stock Exchange Building, later renamed the Totman Building, to a new home base in Philadelphia. The exchange merged with the Washington Stock Exchange in 1954.
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