Description
NSE will conduct a mock trading session in the Capital Market Segment on April 18, 2026, covering both Primary Site and DR Site sessions. NEAT+ version 7.8.7 is applicable; no new version release.
Summary
NSE is conducting a mock trading session in the Capital Market Segment on Saturday, April 18, 2026. The session covers two trading sessions — one from the Primary Site and one from the Disaster Recovery (DR) Site. This mock is linked to the earlier circular on New Encryption Mechanism of Interactive Messages & Immediate Order Acknowledgement (NSE/CMTR/72769 dated February 12, 2026). No new software version is being released for this mock.
Key Points
- Mock trading date: Saturday, April 18, 2026
- Two trading sessions: Session-1 from Primary Site, Session-2 from DR Site
- NEAT+ version applicable: 7.8.7 (download path:
/common/NEATPlus787) - No new version release for this mock
- All outstanding orders will be purged before each session
- Members using NNF software must manually clear orders in their systems
- NEAT Adapter reference circular: NSE/MSD/73674 dated April 09, 2026
Session Schedule
Trading Session-1 (Primary Site)
| Particulars | Time |
|---|---|
| Morning Block Deal Window Session-1 Open | 10:45 |
| Morning Block Deal Window Session-1 Close | 11:00 |
| Pre-Open Open | 11:00 |
| Pre-Open Close (random in last 1 min) | 11:08 |
| Special Pre-Open Open (IPO & Relisted) | 11:00 |
| Special Pre-Open Close (random in last 10 min) | 11:45 |
| Normal Market Open | 11:15 |
| T+0 Market Open | 11:15 |
| Call Auction Illiquid Session Open | 11:30 |
| T+0 Market Close | 12:30 |
| T+0 Trade Modification End | 12:40 |
| Normal Market Open (special pre-open stocks) | 12:00 |
| Auction Market Open | 11:30 |
| Auction Market Close | 12:15 |
| Afternoon Block Deal Window Session-2 Open | 12:05 |
| Afternoon Block Deal Window Session-2 Close | 12:20 |
| Normal Market Close | 13:00 |
Trading Session-2 (DR Site)
| Particulars | Time |
|---|---|
| Pre-Open Open | 13:30 |
| Pre-Open Close (random in last 1 min) | 13:38 |
| Normal Market Open | 13:45 |
| Call Auction Illiquid Session Open (30 mins) | 13:45 |
| Normal Market Close | 14:30 |
| Closing Session Open | 14:40 |
| Closing Session Close | 14:50 |
| Trade Modification End | 15:00 |
Re-login Timings
| Particulars | Time |
|---|---|
| Live Re-login Start | 16:00 |
| Live Re-login Close | 16:30 |
NEAT Adapter Port Details
| Login Through | Applicable GR Port |
|---|---|
| Old NEAT Adapter v1.0.20 (Windows/Linux) | 10817 |
| New NEAT Adapter v1.0.27 (Windows/Linux) | 10823 |
Regulatory Changes
No regulatory changes. This is a routine operational mock trading exercise tied to the rollout of the New Encryption Mechanism for Interactive Messages & Immediate Order Acknowledgement.
Compliance Requirements
- All Capital Market segment members must take note of session timings and software version requirements
- Members must use NEAT+ version 7.8.7 for this mock
- Members using NNF software must manually purge outstanding orders before each session
- Members should refer to Annexures 1, 2, and 3 for detailed instructions on mock participation and DR site switchover guidelines
- Connectivity details available in circular NSE/MSD/67674 dated April 24, 2025
- Installation guide available on NSE Extranet at
/common/InstallationProcedure
Important Dates
- April 18, 2026: Mock trading session date
- April 09, 2026: NEAT Adapter reference circular (NSE/MSD/73674)
- February 12, 2026: Original encryption mechanism circular (NSE/CMTR/72769)
Impact Assessment
This circular is operationally relevant for all NSE Capital Market segment members. Participation in the mock session allows members to validate connectivity, software compatibility (NEAT+ 7.8.7), and DR site switchover procedures. No financial or regulatory impact; no new software version is being released. Members not participating may face operational risks during live market sessions if system readiness is not verified.
Impact Justification
Routine mock trading exercise relevant to all Capital Market segment members; no regulatory or listing impact, but operationally important for members to test connectivity and software versions.