Mock trading on Saturday, June 20, 2026 - Testing of Trading modalities related to Introduction of Closing Auction Session (CAS) in Equity Cash Segment

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National Stock Exchange of India Limited Circular Department: CAPITAL MARKET SEGMENT Download Ref No: NSE/CMTR/74792 Date: June 19, 2026 Circular Ref. No: 87/2026 All Members, Mock trading on Saturday, June 20, 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’, members are advised to note that Exchange will be conducting a mock trading session in the Capital Market on Saturday, June 20, 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: June 20, 2026 Particulars Time in Hrs Trading Session-1 from DR Site# Morning Block Deal Window Session-1 open time 08:45 Morning Block Deal Window Session-1 close time 09:00 Pre-Open open time 09:00 Pre-Open* close time * Random closure in last one minute 09:08 Special Preopen Session open time (For IPO & Relisted security) 09:00 Special Preopen Session** close time (For IPO & Relisted security) ** Random closure in last ten minute 09:45 Normal Market open time 09:15 T+0 Market Open time 09:15 National Stock Exchange of India Limited Page 2 of 7 Call Auction Illiquid session open time (1 sessions of 1 hour)* * Random closure in last one minute 09:30 T+0 Market Close time 09:45 T+0 Market Trade modification end time 09:50 Normal market open time for stocks in special preopen session 10:00 Auction Market Open Time 09:30 Auction Market Close Time 10:15 Block Deal Window Session – 2 Open time 09:50 Block Deal Window Session – 2 Close time 10:05 Normal Market close time for CAS securities. 10:25 CAS Open time 10:30 CAS Market order restriction start time 10:45 CAS close time * * Random closure in last two minute 11:00 Normal Market close time 11:00 Closing Session open time 11:20 Closing Session close time 11:30 Mock Date: June 20, 2026 Particulars Time in Hrs Trading Session-2 from Primary Site Morning Block Deal Window Session open time 13:30 Morning Block Deal Window Session close time 13:45 Pre-Open open time 13:45 Pre-Open* close time * Random closure in last one minute 13:53 Special Preopen Session open time (For IPO & Relisted security) 13:45 Special Preopen Session** close time (For IPO & Relisted security) ** Random closure in last ten minute 14:30 Normal Market open time 14:00 T+0 Market Open time 14:00 Call Auction Illiquid session open time (2 sessions of 30 min each)* * Random closure in last one minute 14:15 T+0 Market Close time 15:00 T+0 Market Trade modification end time 15:10 Normal market open time for stocks in special preopen session 14:45 National Stock Exchange of India Limited Page 3 of 7 Auction Market Open Time 14:30 Auction Market Close Time 15:15 Block Deal Window Session Open time 15:05 Block Deal Window Session Close time 15:20 Normal Market close time 15:45 Trading Session-3 from DR Site Pre-Open open time 16:30 Pre-Open* close time * Random closure in last one minute 16:38 Normal Market open time 16:45 Call Auction Illiquid session open time (1 session of 15 mins)* * Random closure in last one minute 16:45 Normal Market close time 17:15 Closing Session open time 17:25 Closing Session close time 17:35 Trade Modification end time 17:40 Relogin Timings Live Re-login start time 18:30 Live Re-login close time 19:00 #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: Version Availability Download path on NSE Extranet path NEAT+ 7.8.9 On June 20, 2026, 07:00 hours /cmftp/common/ Mock/CM/20JUNE2026/NEATPlus789 ➢ The master files applicable for Trading Session-1 (i.e., security.gz, nnf_security.gz & NSE_CM_security_20062026.csv.gz) will be made available to trading members on the NSE Extranet (Path: /cmftp/common/Mock/CM/20JUNE2026) on June 20, 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 June 19, 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 June 20, 2026. National Stock Exchange of India Limited Page 4 of 7 B) For mock session 2 & 3 and Live trading from June 22, 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 June 19, 2026: Version Download Path on NSE Extranet: 7.8.8 /cmftp/common/NEATPlus788 File name Location EOD File Date security.gz /cmftp/common/ntneat June 19, 2026 participant.gz nnf_security.gz nnf_participant.gz NSE_CM_security_19062026.csv.gz cm_contract_stream_info.csv /cmftp/common/tbt_masters C) Discontinuation of Order book snapshot recovery via Solace API ➢ Members may note that Order book snapshot recovery via Solace API shall be discontinued from June 20, 2026. Hence, members may mandatorily migrate to Order book snapshot recovery via TCP/IP (refer circular NSE/MSD/74567 dated June 05, 2026) D) New CA Certificate ➢ Members are requested to refer to circular no. NSE/MSD/74511 dated June 02, 2026 regarding new CA certificate and NSE/MSD/74559 dated June 05, 2026 for new version of Neat Adapter EXE application. Accordingly, members are requested to use the combination of new NEAT adapter version and new ports applicable for capital market segment as below: Login through Dates Applicable GR PORT New NEAT Adapter application Version 1.0.29 for Windows Neat Adapter Version 1.0.29 for Linux Neat Adapter Mandatory from July 06, 2026 (mock) 10831 Members using Direct connection through NNF users, are requested to download and use the new CA certificate which is available in Extranet path ( /common/Encryption_CA_Certificate/2026_Certificate ). Accordingly, members shall ensure readiness of their migration plan by July 06, 2026. The applicable new interactive parameters to be used with ‘New CA certificate’: Segment Gateway Router Gateway IPs Subnet ranges IP Address New Port Network Mask Port Capital Market (CM) 172.19.12.85 10827 172.19.12.0 255.255.255.128 10810 10831* 10833** *Port – This port will support new encryption messages with MD5 checksum removal. National Stock Exchange of India Limited Page 5 of 7 **Port - This port will support new encryption messages with MD5 checksum removal and new immediate Ack request for order related messages. 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 Aarti Surve Chief Manager Annexure – 1 Important instructions regarding mock trading session Particulars Details Connectivity Parameters: Refer to circular NSE/MSD/73993 dated April 30, 2026 & NSE/MSD/74511 dated June 02, 2026 for interactive connectivity details. Installation Guide: Available on NSE Extranet at /common/InstallationProcedure. Software Version: NEAT+ 7.8.8 Order Purge: All outstanding orders will be cleared before each session. Members using NNF software must manually clear orders in their systems. Software Testing: Refer to circular NSE/MSD/46441 and SEBI circular SEBI/HO/MRD1/DSAP/CIR/P/2020/234. Members may use either Mock Trading or Simulated Environment to meet regulatory requirements. No Financial Obligation: Trades during mock sessions will not result in any fund pay-in or pay- out. UCC/PAN Validity: Only valid and compliant UCC/PAN uploaded and approved before cutoff will be allowed. For queries, contact uci@nse.co.in. UCC Validation will be skipped during contingency time for order entry. Toll Free No Email id 1800-266-0050 (Option 1) msm@nse.co.in National Stock Exchange of India Limited Page 6 of 7 NOTIS Availability: The NOTIS application will be accessible during the mock session. Participation: Members should participate using all trading software and re-login into live environment to ensure smooth connectivity for Monday June 22, 2026. Live Updates: Visit www.nseindia.com for any session-related updates. Support: For queries, call Toll-Free: 1800 266 0050 (Option 1). Annexure – 2 Pre-requisites / General guidelines for participating in the Mock environment Pre-requisites / General guidelines Heads Details Eligibility All members enabled for trading in the Capital Market (CM) segment in the live market are automatically eligible for mock trading. Participation is enabled using existing User IDs, IPs, and Box ID mappings from the live environment. Telnet Connectivity Ensure you can successfully telnet the Exchange host from the IP address you intend to use. Box ID Setup Confirm that the Box ID is created on the IP with appropriate messages for the segment you wish to trade in. NNF Application Users If using Non-NEAT Frontend (NNF): a) User ID must be of dealer type. b) It must be converted for NNF. C) It must be mapped with the IP. Branch/User Limits Set appropriate branch and user limits from the Corporate Manager Terminal before placing orders in the mock session. Exchange Requests for Mock Participation Send email requests for the following actions with User ID and segment details: a) Pro Enablement b) CTCL Conversion (only dealer IDs) c) Password Reset for Corporate Manager User ID d) Unlocking of Corporate Manager User ID e) Change of Trading Rights (e.g., PRO to CLI, PRO+CLI) Password Management Corporate Manager User ID: Exchange will assist with reset/unlock via email. Other User IDs: Members must reset/unlock these themselves using the Corporate Manager Terminal. National Stock Exchange of India Limited Page 7 of 7 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.