The National Stock Exchange (NSE) has extended trading hours for the equity derivatives segment by 10 minutes, with the normal market closing time revised to 3:40 pm from the current 3:30 pm. The change will come into effect from August 3, 2026.
According to an NSE circular, the pre-open session timings in the derivatives segment will remain unchanged, with trading beginning at 9:00 am and the pre-open session ending at 9:08 am through a system-driven random closure in the final minute. The normal market session will continue to open at 9:15 am.
The trade modification window will also remain unchanged and will continue until 4:15 pm.
There will be no change in the methodology used for computing closing prices of derivative contracts. NSE said the volume-weighted average price used for close price calculation will continue to be based on trades executed during the last half hour of trading, which will now be from 3:10 pm to 3:40 pm.
The exchange added that the functional changes arising from the implementation will be made available for testing during mock trading sessions. A separate circular detailing the mock sessions will be issued later.
The exchange will also broadcast a message on NEAT trading terminals at the start of the Closing Auction Session in the equity segment when the operating price range for stock futures is reset. As part of the process, outstanding orders lying outside the revised price range will be cancelled by the exchange in accordance with existing rules.
The exchange also said that a security will cease to be eligible for the Closing Auction Session (CAS) if it is excluded from the equity derivatives segment on both exchanges. In such cases, its closing price will be determined using the existing methodology, based on the volume-weighted average price (VWAP) of trades executed during the last 30 minutes of trading.
However, as long as the security remains part of the equity derivatives segment on at least one exchange, it will continue to be eligible for CAS.
The exchange will cancel all unexecuted special orders, including stop-loss and disclosed quantity orders. Any pending orders that fall outside the revised price band will also be cancelled, with members receiving an appropriate cancellation message.
