The National Stock Exchange (NSE) will introduce a pre-open session for the equity derivatives (F&O) segment starting December 8, 2025. This mechanism will apply to both single-stock and index futures, marking a key step toward improving price discovery and market efficiency in the derivatives market.

The pre-open session will run for 15 minutes, from 9:00 am to 9:15 am, through a call auction mechanism. It will be divided into three phases:

Order Entry (9:00 am–9:08 am) – Participants can place, modify, and cancel orders, with a system-driven random closure between the 7th and 8th minute. Note that random closures will occur independently for equity and derivatives pre-open sessions.

Order Matching & Trade Confirmation (9:08 am–9:12 am) – The system will determine the opening price b

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