Mock Trading for Closing Auction Session Testing in Equity Cash Segment

National Stock Exchange of India Limited

Circular Department: CAPITAL MARKET SEGMENT Download Ref No: NSE/CMTR/75366 Date: July 23, 2026 Circular Ref. No: 103/2026

All Members,

Mock trading on Saturday, July 25, 2026 – Testing of Trading modalities related to Introduction of Closing Auction Session (CAS) in Equity Cash segment

With reference to circular no. NSE/CMTR/74466 dated May 29, 2026 regarding ‘Introduction of Closing Auction Session (CAS) in the Equity Cash segment - trading modalities’, Exchange will be conducting a mock trading session in the Capital Market on Saturday, July 25, 2026.

Further, Exchange shall be introducing new NEATPlus version (7.8.9) for aforesaid CAS implementation related testing. Members must note that said new NEATPlus version shall be applicable only during the Trading Session-1 of the mock. Post Trading session 1, members shall have to reinstall and login with earlier NEATPlus version (7.8.8) for Trading Session – 2 & 3 which shall be conducted as per existing Trading modalities without changes related to CAS. Kindly refer point A, and B for more information.

Mock Date: July 25, 2026

Call Auction Illiquid session open time (2 sessions of 30 min each)* * Random closure in last one minute | 08:30 T+0 Market Close time | 08:40 T+0 Market Trade modification end time | 08:45 Normal market open time for stocks in special preopen session | 09:00 Auction Market Open Time | 08:30 Auction Market Close Time | 09:15 Normal Market close time for CAS securities. | 09:00 CAS Open time | 09:05 CAS Market order restriction start time | 09:50 CAS close time * * Random closure in last two minute | 10:35 Normal Market close time | 10:35 Closing Session open time | 10:45 Closing Session close time | 10:55

Trading Session-2 from Primary Site | Block Deal Window Session open time | 13:00 Block Deal Window Session close time | 13:15 Pre-Open open time | 13:15 Pre-Open* close time * Random closure in last one minute | 13:23 Special Preopen Session open time (For IPO & Relisted security) | 13:15 Special Preopen Session** close time (For IPO & Relisted security) ** Random closure in last ten minute | 14:00 Normal Market open time | 13:30 T+0 Market Open time | 13:30 Call Auction Illiquid session open time (3 sessions of 1 hour each)* * Random closure in last one minute | 13:30 T+0 Market Close time | 14:30 T+0 Market Trade modification end time | 14:40 Normal market open time for stocks in special preopen session | 14:15 Auction Market Open Time | 14:45 Auction Market Close Time | 15:30 Block Deal Window Session Open time | 16:00 Block Deal Window Session Close time | 16:15 Normal Market close time | 17:00 Trading Session-3 from DR Site | Pre-Open open time | 18:15 Pre-Open* close time * Random closure in last one minute | 18:23 Normal Market open time | 18:30 Call Auction Illiquid session open time (1 session of 15 mins)* * Random closure in last one minute | 18:30 Normal Market close time | 19:00 Closing Session open time | 19:10 Closing Session close time | 19:20 Trade Modification end time | 19:30 Re-login Timings | Live Re-login start time | 19:30 Live Re-login close time | 20:00

#Trades from trading session 1 shall not be available in trading session 2 & 3. However, Trades from trading session 2 shall be available in trading session 3. Members are requested to actively participate in all trading sessions.

Members are advised to take note of the below important instructions:

A) Testing of Closing Auction Session (CAS) (Trading session - 1)

➢ Below NEAT+ version should be used explicitly for mock session 1 only:

➢ The master files applicable for Trading Session-1 (i.e. security.gz, nnf_security.gz & NSE_CM_security_25072026.csv.gz) will be made available to trading members on the NSE Extranet (Path: /cmftp/common/Mock/CM/25JULY2026) on July 25, 2026 on or before 7:00 hours. All other master files which were generated by Exchange post completion of end of trading day activities on July 24, 2026 shall be applicable for the mock trading session. ➢ Members are advised to load the above master files in the trading application before Mock trading session 1 on July 25, 2026.

B) For mock session 2,3 and Live trading from July 27, 2026, kindly use below NEAT+ version (i.e. 7.8.8) & download the master files which were generated by Exchange post completion of end of trading day activities on July 24, 2026:

For other important instructions regarding the mock trading, kindly refer to the following Annexures: Annexure 1: Important instructions regarding mock trading session. Annexure 2: Pre-requisites / General guidelines for participating in the Mock environment. Annexure 3: Important guidelines in case of switchover of trading system to Disaster Recovery (DR) Site.

For and on behalf of National Stock Exchange of India Limited

Khushal Shah Associate Vice President

Annexure – 1 Important instructions regarding mock trading session

Annexure – 2 Pre-requisites / General guidelines for participating in the Mock environment

Annexure – 3 Important guidelines in case of switchover of trading system to Disaster Recovery (DR) Site

1. Kindly note below points after switch over to DR site: a. Trades of primary site will be available in Previous Trades window. b. Trades can be modified/cancelled using Multiple Trade Modification and Cancellation window respectively. c. Messages of primary site will be available in TWS Message Area.
2. If user renames or deletes the User folder and re-login the NEAT+ terminal, then data of primary site shall not be available in the functional window as mentioned above point.