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
New-York Mining Stock and National Petroleum Exchange New-York Mining Stock and National Petroleum Exchange The National Petroleum Exchange was a resource exchange in New York City founded in 1882. In 1883 the National Petroleum Exchange and the New York Mining Stock Exchange were consolidated, becoming the New-York Mining Stock and National Petroleum Exchange. After several other exchange mergers with competitors, the exchange became the Consolidated Stock and Petroleum Exchange of New York, which in 1885 became the Consolidated Stock Exchange of New York. On December 18, 1882, the National Petroleum Exchange was opened. Sales that day equated to 150,000 barrels. On March 24, 1883, the New-York Mining