Why did my order not fill overnight?

The term Regular Trading Hours (RTH) is generally used to refer to the primary trading session for a particular exchange or region. For example, in the case of US equity markets, the RTH are from 09:30 to 16:00 ET. This designation is relevant as many exchanges offer pre- and post-market trading sessions which are referred to as extended trading hours or trading outside of RTH…

Trading outside Regular Trading Hours (RTH), which includes pre-market and after-hours sessions, requires special attention to certain factors:

1. Order Types and Eligibility:
   • Market orders are generally not accepted during extended trading hours…

No, orders from Regular Trading Hours (RTH) and those orders marked to work outside RTH will not be eligible for the overnight session.

Additional Information…

There are two reasons why an order would be filled during the pre-market session:

1. The submitted order was set to work outside regular trading hours (RTH) or pre-market hours.
2. The order was for an OTC/Penny stock which does not have a pre-market session but starts regular trading hours at 8:00 EST…