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MCX Blames UCC Parameter for Four-Hour Halt as Sebi Probe Looms

The exchange says it has implemented fixes following a capacity breach tied to client‑code limits.

Overview

  • Trading on Tuesday started late and resumed at 1:25 p.m. after more than four hours, marking MCX’s longest halt this year and its second major outage in 2025.
  • Sebi is investigating the delay, and under its rules a stoppage exceeding three hours can attract additional monetary penalties.
  • MCX identified a predefined limit on Unique Client Codes as the root cause and said corrective steps are in place with systems stable for current volumes.
  • Failover to the disaster recovery site did not restore operations because the capacity breach persisted there as well, according to source reports.
  • Traders, especially in bullion, reported losses and escalated complaints via IBJA, while a brokers’ body is seeking talks with the MCX chair and top management.