The National Stock Exchange of India (NSE), on July 30, 2026, announced a mock trading session in the Futures & Options (F&O) segment on August 1, 2026, to test the go-live of trading modalities related to the introduction of the Closing Auction Session (CAS) in the Equity Cash segment. The revised trading framework will become effective in the live market from August 3, 2026, and members are required to participate in the mock using the new NEAT+ Version 7.8.9.
The mock exercise will be conducted in three trading sessions across the Primary Site and Disaster Recovery (DR) Site, followed by a live re-login session. The Exchange has also introduced changes to the price band determination for stock futures, which will be aligned with the CAS by using the Volume Weighted Average Price (VWAP) during specified time windows. Members are advised to migrate to NEAT+ Version 7.8.9 and update their systems to support the new market data broadcast parameters, as the existing parameters will be discontinued from September 5, 2026.
Members have been instructed to participate actively in all mock sessions, complete system testing, and ensure readiness for the live implementation of the revised trading modalities from August 3, 2026. The Exchange has also issued detailed operational guidelines, technical instructions, and disaster recovery procedures to facilitate a smooth transition.
[Circular Ref. No. 109/2026]
