This term is synonymous with the “open outcry” or pit session hours for a given market, e.g. 9:30 – 16:15 EST for the S&P 500. Many markets trade nearly 24 hours a day electronically; however, the bulk of volume is transacted during their “regular” trading hours. For this reason, the regular session’s open, high, low, and closing prices carry great significance for most traders and their systems.
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