The National Stock Exchange (NSE) has announced a significant change to trading hours in the equity derivatives segment with the introduction of the Closing Auction Session (CAS) framework.
Starting August 3, 2026, the normal market closing time for equity derivatives will be extended by 10 minutes to 3:40 pm from the current 3:30 pm. While the extension is noteworthy, the bigger change lies in how closing prices for eligible securities will be determined.