New pre-open session rules take effect on stock exchanges

Stock exchanges have implemented revised rules for the pre-open trading session starting today. The buffer period for transitioning from the pre-open to the continuous trading session remains fixed from 9:12 am to 9:15 am, according to multiple sources.

The key objective of the new pre-open session is to make the opening price discovery process more structured and efficient. This change is intended to reduce the scope for last-minute market-order activity that can affect price stability. The revised timings include a pre-open session starting at 9:00 am, with the buffer period unchanged at 9:12 am to 9:15 am before continuous trading begins.