Description

NSE will conduct mock trading session on December 06, 2025. UCC live environment will be unavailable from 10 AM to midnight, and any modifications during this period will be purged.

Summary

NSE will conduct a mock trading session on Saturday, December 06, 2025. The Unique Client Code (UCC) live environment will be unavailable from 10 AM until midnight on that day. Members are advised to refrain from making any UCC modifications or uploads during this period, as any changes made will not be valid for live trading on Monday, December 08, 2025, and will be purged from the system.

Key Points

  • Mock trading session scheduled for Saturday, December 06, 2025
  • UCC live environment unavailable from 10 AM to midnight on December 06, 2025
  • Any UCC additions or modifications during downtime will be purged by end of day
  • Changes made during mock trading period will not be valid for live trading on December 08, 2025
  • Members must avoid UCC modifications/uploads during the specified timeframe
  • Related circulars: NSE/CMTR/71647, NSE/FAOP/71649, NSE/CD/71646, NSE/SLBS/71650, NSE/COM/71648

Regulatory Changes

No regulatory changes introduced. This is an operational notice for mock trading procedures.

Compliance Requirements

  • Members must refrain from making any UCC modifications or uploads between 10 AM and midnight on December 06, 2025
  • Members should plan UCC updates before 10 AM on December 06, 2025, or after the system is restored
  • Ensure all critical UCC changes are completed before the mock trading session begins

Important Dates

  • December 05, 2025: Circular issued
  • December 06, 2025: Mock trading session; UCC environment unavailable from 10 AM to midnight
  • December 06, 2025: End of day - all UCC records added/modified during downtime will be purged
  • December 08, 2025: Regular live trading resumes on Monday

Impact Assessment

Operational Impact: Medium - Members cannot add or modify UCC records during a 14-hour window on Saturday. This may affect members who need to onboard new clients or update client information over the weekend.

Market Impact: Low - The mock trading session occurs on a non-trading day (Saturday) and does not affect regular market operations. Normal trading resumes Monday.

Member Action Required: Members must plan UCC management activities around the downtime period to avoid data loss. Critical updates should be completed before 10 AM on December 06, 2025, or postponed until after midnight.

Contact Information: Members can reach out via toll-free number 1800 266 0050 (option 5) or email uci@nse.co.in for queries.

Impact Justification

Mock trading session requires system downtime affecting UCC operations, but does not impact regular trading days. Members must avoid modifications during specified period to prevent data loss.