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
Chicago Stock Exchange the New Orleans Stock Exchange became part of the Midwest Stock Exchange, and in the early 1960s the Midwest Stock Exchange Service Corporation was established to provide centralized accounting for member firms. In April 1978, the Chicago Stock Exchange launched an Intermarket Trading System (ITS), a system that allowed orders to be sent from one exchange to another to ensure that customers received the best execution available. In the 1980s, the Chicago Stock Exchange made several technological advancements to improve trading. In 1982, the CHX launched the MAX system, which allowed CHX to be one of the first stock exchanges