Key facts
- NSE will introduce the Closing Auction Session (CAS) framework in the equity derivatives segment.
- The change will be effective from August 3, 2026.
- Market closing time will be extended by 10 minutes to 3:40 pm.
- An auction-based mechanism will be adopted to determine closing prices.
- The aim is to improve price discovery and align cash and derivatives market settlements.
The National Stock Exchange (NSE) is implementing a new framework for its equity derivatives segment to enhance market efficiency. The introduction of the Closing Auction Session (CAS) aims to refine the process of determining closing prices and bring it closer to the settlement mechanisms used in the cash market.