Market pre-open rules change from today: Here's what is different
The National Stock Exchange (NSE) has implemented new rules for its pre-open auction session to improve price discovery and reduce market volatility. The changes include a restructured timeline for order entry and modifications, specifically limiting the window for market orders.
Why it matters
These regulatory changes directly impact how traders and investors execute orders at the start of the trading day, aiming to create a more efficient market.
The National Stock Exchange (NSE) will implement the new pre-open auction session to help determine the opening prices for stocks. The new pre-open session is applicable for all stocks in equity cash market - including SME, InvITs/REITs and the derivatives segment. The overall market timing for the new pre-open session remains the same - i.e. from 09:00 am to 09:15 am. However, there are certain changes in the order entry, type of order entry, modifications, cancellations and matching/execution procedure when compared the earlier pre-open system in place till Friday, September 04, 2026. "The key objective of the revised pre-open session is to make opening price discovery more structured and efficient, while reducing the scope for last-minute market-order activity," says Sudeep Shah, Head- Technical and Derivatives Research at SBI Securities. Here's a step-by-step guide on the new pre-open session, and how it is different from the earlier pre-open session.
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