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 and in the early 1960s the Midwest Stock Exchange Service Corporation was established to provide centralized accounting for member firms. In 1993 it changed its name back to the Chicago Stock Exchange. The Chicago Stock Exchange was founded in a formal meeting on March 21, 1882. At this time, Charles Henrotin was elected the chairman and president. In April that year, a lease was taken out at 115 Dearborn Street for the location of the exchange and during that year 750 memberships were sold. On May 15, 1882, the Chicago Stock Exchange officially became public and opened its offices, with