Skip to content

Which companies just had a verified incident, who lends to them and who owns them. Every claim carries its evidence level and its source. How we decide what is confirmed

Global Financial Service Disruptions

CME Group (Globex, EBS, BrokerTec)

securities exchange · US · Global · CME Group Inc.

Technical failureStatus: resolvedTier 1Severity 5 of 5Evidence confidence: highAnalyst-verified

A chiller plant failure at CyrusOne's CHI1 data center halted CME Globex futures and options and EBS FX trading from about 20:40 CT on 27 Nov 2025 until the next US morning. It was one of the largest derivatives market outages on record.

First disruption
Nov 28 02:40 UTC
First public signal
Nov 28 (CME market notice)
Acknowledged
Nov 28
Restored
Nov 28
Duration
not established
DFX first recorded
Nov 5 14:58 UTC

What was restricted

tradingScope: sector wide

Globex futures and options and EBS FX halted globally for roughly 10 hours, from Asian hours until US morning; BrokerTec and EBS reopened first.

Cause, kept in separate layers

What the institution said
Due to a cooling issue at CyrusOne data centres, our markets are currently halted
DFX classification
Technical failure (cyber: ruled out)
Conflicting reports
About 10 hour duration from one outlet only; duration_hours left null. One crypto outlet speculated a targeted disruption, unsupported.

Dependencies

A dependency is a documented relationship. It is not evidence that the provider was compromised.

  • Provider: CyrusOne CHI1 data center (colocation hosting of matching engines), verified
  • Downstream: Gulf Mercantile Exchange: trading also halted (documented)

Evidence