The NSE Pre-Open CAS Session will follow revised timings from September 7, 2026, with the order entry process beginning at 9:00 a.m. and the transition to the Continuous Trading Session completed by 9:15 a.m.
Under the revised schedule, all orders, including limit and market orders, can be entered between 9:00 a.m. and 9:05 a.m. The next phase, from 9:05 a.m. to 9:10 a.m., will allow only limit orders, with a random close during the final two minutes.
Revised Pre-Open Auction Session Schedule
Order matching will take place between 9:10 a.m. and 9:12 a.m. Orders will then move from the Pre-Open Session to the Continuous Trading Session (CTS) between 9:12 a.m. and 9:15 a.m.
NSE has also specified the execution priority for orders during the process. Market orders against market orders will receive the first priority based on time priority.
Residual market orders against limit orders will receive the second priority based on price-time priority. The remaining limit orders against limit orders will be executed under the third priority, also based on price-time priority.
CAS Records ₹39,718 Crore on Index Rebalancing Day
The revised timings come after the National Stock Exchange of India Limited (NSE) recorded ₹39,718 crore, or approximately USD 4.2 billion, in turnover through the Closing Auction Session (CAS) on August 31, 2026.
The session accounted for 22% of NSE’s total cash market turnover that day and recorded a market share of 99.9%. More than 98,000 unique investors participated in the session, while turnover was approximately 42 times that recorded in the previous trading session.
The high activity was driven by the MSCI August 2026 Index Review, which took effect at the close of trading on August 31, according to NSE.
The August 31 session also marked the completion of CAS’s first month. During this period, NSE recorded cumulative CAS turnover of ₹63,000 crore, or approximately USD 6.6 billion, with a market share of 98.2%.
Q1. When did the revised NSE Pre-Open CAS Session timings take effect?
The revised timings took effect on September 7, 2026.
Q2. What is the order entry time for all orders in the Pre-Open CAS Session?
Limit and market orders can be entered between 9:00 a.m. and 9:05 a.m.
Q3. When does order matching take place?
Order matching takes place from 9:10 a.m. to 9:12 a.m.
Q4. How much turnover did NSE’s Closing Auction Session record on August 31?
The Closing Auction Session recorded ₹39,718 crore in turnover.
Source: Official NSE India source for the Pre-Open and Closing Auction Session announcement.
