Mock Trading for Closing Auction Session Implementation in Equity Cash Segment
Official title
Mock trading on Saturday, August 01, 2026 - Go Live of trading modalities related to Introduction of Closing Auction Session (CAS) in Equity Cash segment - New version of NEAT+ 7.8.9
Official record
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Check the official recordWhat changed
The National Stock Exchange (NSE) will conduct a mock trading session in the Futures & Options segment on August 1, 2026, to test trading modalities related to the introduction of the Closing Auction Session (CAS) in the Equity Cash segment. This session will utilize the new NEAT+ version 7.8.9. Members are required to participate to ensure system readiness for the live implementation of these changes, which takes effect on August 3, 2026. The mock session includes three trading sessions across primary and disaster recovery sites. Members must ensure their systems are updated and compatible with new market data broadcast parameters, as existing parameters will be discontinued on September 5, 2026.
- Who is affected
- All members enabled for trading in the Futures & Options segment.
- Required action
- Participate in the mock trading session on August 1, 2026, using NEAT+ version 7.8.9.
- Migrate to new market data broadcast parameters if currently using existing ones.
- Key dates
- Mock trading session date — 31 Jul 2026
- Effective date for CAS trading modalities in live environment — 02 Aug 2026
- Discontinuation date for NEAT+ version 7.8.8 and existing broadcast parameters — 04 Sept 2026
- Consequences
- Existing broadcast parameters will be discontinued on September 5, 2026.
Source details
- Source
- National Stock Exchange of India
- Type
- circular
- Published by source
- 29 Jul 2026
- Document number
- NSE/FAOP/75472
- Issuing division
- FUTURES & OPTIONS
- Effective date
- 02 Aug 2026
- Coverage area
- securities
Document text
National Stock Exchange of India Limited
Circular
| Department: FUTURES & OPTIONS | |
|---|---|
| Download Ref No: NSE/FAOP/75472 | Date: July 30, 2026 |
| Circular Ref. No: 109/2026 |
All Members,
Mock trading on Saturday, August 01, 2026 – Go Live of Trading modalities related to Introduction of Closing Auction Session (CAS) in Equity Cash segment – New version of NEAT+ 7.8.9
Members are required to note that the changes in trading modalities in the Equity Derivatives segment due to introduction of CAS in equity segment, shall be effective in LIVE from August 03, 2026. Following circulars were issued by Exchange:
| Particulars | Reference number & date | Subject |
|---|---|---|
| Circulars | NSE/CMTR/73362 dated March 18, 2026 | Operational guidelines and Standard Operating Procedure (SOP) on Introduction of Closing Auction Session (CAS) in the Equity Cash Segment |
| NSE/FAOP/74467 dated May 29, 2026 | Introduction of Closing Auction Session (CAS) in the Equity Cash segment - Change in trading modalities in the Equity Derivatives segment | |
| FAQ path | https://www.nseindia.com/static/trade/continuous-markets-FAQs > Closing Auction Session (CAS) in Equity segment(CM) and changes in Equity Derivatives (F&O) Segment |
In continuation to circular (Download No. 71999) dated December 24, 2025, Exchange shall be conducting a mock trading session in the Futures & Options segment on Saturday, August 01, 2026.
| Mock Date: August 01, 2026 | |
|---|---|
| Particulars | Time in Hrs |
| Trading Session-1 from Primary Site | - |
| Pre-Open Open time | 07:45 |
| Pre-Open Close time* *Random closure in last one minute | 07:53 |
| Normal Market open time | 08:00 |
| Contingency start time | 08:45 |
| Contingency end time | 09:55 |
| Normal Market close time | 10:00 |
| Mock Date: August 01, 2026 | |
|---|---|
| Particulars | Time in Hrs |
| Trading Session-2 from DR Site# | - |
| Pre-Open Open time | 10:30 |
| Pre-Open Close time* *Random closure in last one minute | 10:38 |
| Normal Market open time | 10:45 |
| Update of Stock future price bands for alignment with CAS in Equity Cash Market | 11:30 |
| Normal Market close time | 11:55 |
| Trade Modification end time | 12:05 |
| Mock Date: August 01, 2026 | |
|---|---|
| Particulars | Time in Hrs |
| Trading Session-3 from Primary Site# | - |
| Pre-Open Open time | 14:00 |
| Pre-Open Close time* *Random closure in last one minute | 14:08 |
| Normal Market open time | 14:15 |
| Update of Stock future price bands for alignment with CAS in Equity Cash Market | 15:15 |
| Normal Market close time | 15:40 |
| Trade Modification end time | 15:50 |
| Re-login Timings | |
| Live Re-login start time | 20:00 |
| Live Re-login close time | 21:00 |
#Trades from trading session 1 & 2 shall not be available in trading session 3. However, Trades from trading session 1 shall be available in trading session 2. Members are requested to actively participate in all trading sessions.
Members are required to take note of the below important points:
A) NEATPlus version details :
| Version | Download path on NSE Extranet path | Discontinuation date |
|---|---|---|
| 7.8.8 | /faoftp/faocommon/NEATPlus788 | September 05, 2026 (mock) |
| 7.8.9 | /faoftp/faocommon/NEATPlus789 | - |
B) In order to align the price band for stock future contacts applicable during the CAS in CM segment, the reference price shall be determined based on the VWAP of the trades executed in the respective stock futures between 11:15 a.m and 11:30 a.m (Session 2) and 03:00 p.m to 03:15 p.m (Session 3).
C) NEATPlus version (7.8.8 & 7.8.9) are compatible with new broadcast parameters. For information regarding market data parameters, kindly refer the circular NSE/MSD/75324 dated July 21, 2026.
D) Members using direct connection via NNF may note that existing broadcast parameters shall be discontinued from September 05, 2026 (circular reference NSE/MSD/75324). Accordingly, they shall plan to migrate to new market data broadcast parameters on priority if still using existing broadcast parameters.
For other important instructions regarding the mock trading, kindly refer to the following Annexure: 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
| Toll Free No | Email id |
|---|---|
| 1800-266-0050 (Option 1) | msm@nse.co.in |
Annexure – 1
Important instructions regarding mock trading session
| Particulars | Details |
|---|---|
| Connectivity Parameters: | Refer to circular NSE/MSD/74511 dated June 02, 2026 for interactive connectivity details. |
| Installation Guide: | Available on NSE Extranet at /faoftp/faocommon/Installation_Procedure. |
| NEAT Version: | NEATPlus 7.8.8 & 7.8.9 |
| 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: | With reference to Exchange circular NSE/ISC/51754 dated March 24, 2022 and NSE/ISC/52722 dated June 23, 2022 issued by Investor Services Cell and updated from time to time : 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. |
| Participation: | Members should participate using all trading software and re-login into live environment to ensure smooth connectivity for Monday, August 03, 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 Futures & Options (FO) 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. |
Annexure – 3
Important guidelines in case of switchover of trading system to Disaster Recovery (DR) Site
- 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.
- 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.
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