Why is my limit or market order not done when the market opens at 9.30am (EST) and why is my executed price different from the opening price shown on POEMS?
All the orders received prior to market open will be routed and protected versus the stock’s primary listing exchange market opening print. There may be a delay in the opening for certain stocks in the primary exchange which results in these counters not opening at 9.30am sharp.
However, you may still see transactions executed off the primary exchange before the official open, and these transactions are required to be reported under US Securities and Exchange Commission (SEC) regulation. Any activities taking place prior to the primary market open that is reported to the tape are from alternative display facilities or dark pools. These trades are reported to the tape because under SEC rules, every stock transaction must be reported to a consolidated data feed, whether it occurs on an exchange, like the Nasdaq or Intercontinental Exchange Inc’s (ICE.N) New York Stock Exchange (NYSE), or in a dark pool. Off-exchange trades are reported through Trade Reporting Facilities (TRFs) run by Nasdaq and NYSE in conjunction with FINRA.
Similarly, the high and low of the day for certain counters may be executed off the primary exchange and may not be taken as official primary executed prices.