Description

NSE notifies members that the UCC live environment will be unavailable from 12 PM to midnight on April 18, 2026 due to mock trading. Any UCC modifications during this period will be purged and invalid for live trading on April 20, 2026.

Summary

NSE is conducting a Mock Trading session on Saturday, April 18, 2026, as previously communicated via circulars NSE/CMTR/73778, NSE/FAOP/73779, NSE/CD/73773, NSE/COM/73775, and NSE/SLBS/73774 dated April 17, 2026. As a consequence, the Unique Client Code (UCC) live environment will be unavailable from 12 PM to midnight on April 18, 2026. Members are advised to avoid any UCC modifications during this window.

Key Points

  • UCC live environment will be unavailable from 12 PM to midnight on Saturday, April 18, 2026
  • Any UCC additions or modifications during this period will be considered invalid
  • Invalid UCC records will be purged from the Exchange’s UCC system by end of day on April 18, 2026
  • Purged records will not be valid for the live trading session on Monday, April 20, 2026
  • Members are advised to refrain from any UCC modification or uploads during the blackout window

Regulatory Changes

No new regulatory changes introduced. This is an operational advisory supplementary to previously issued mock trading circulars.

Compliance Requirements

  • All NSE members must avoid making any UCC modifications or uploads between 12 PM and midnight on April 18, 2026
  • Members should ensure all necessary UCC updates are completed before 12 PM on April 18, 2026, or deferred to after midnight
  • Members participating in or impacted by mock trading should coordinate UCC readiness for Monday, April 20, 2026 live session

Important Dates

  • April 18, 2026 (Saturday): Mock Trading session; UCC live environment unavailable from 12 PM to midnight
  • April 18, 2026 (end of day): Purge of invalid UCC records by NSE
  • April 20, 2026 (Monday): Live trading resumes; only valid UCC records will be recognized

Impact Assessment

This circular has a moderate operational impact on all NSE members who manage client UCC data. Members who inadvertently modify or upload UCC records during the blackout window risk having those records purged, potentially preventing affected clients from trading on April 20, 2026. Advance planning is essential to ensure UCC data is current before the blackout begins or updated after midnight on April 18.

Impact Justification

Operational advisory affecting all NSE members regarding UCC system unavailability during mock trading; no regulatory changes, but non-compliance could affect trading eligibility on April 20.