Market structure & regulation
What is Pre-open session?
Hinglish mein padhein: Pre-open session kya hota hai?
The 15-minute auction before normal trading (9:00–9:15 am) in which the exchange discovers each stock's opening price.
Orders are collected for the first eight minutes, then matched at the single price where the most shares can trade. That becomes the open.
It reduces wild swings at the open, especially after overnight news.
Related terms
- Market hoursNSE and BSE equity markets trade from 9:15 am to 3:30 pm IST, Monday to Friday, except exchange holidays, with a pre-open session from 9:00 am.
- Gap up and gap downA gap up is when a stock opens above the previous day's high (or close); a gap down opens below. Gaps usually follow overnight news.