CME Group halted trading across multiple markets due to a cooling system failure at CyrusOne data centers on November 27, 2025. Support teams are resolving the issue swiftly, with pre-open details forthcoming, underscoring vulnerabilities in high-stakes financial infrastructure amid rising trading volumes.
CME Group, the world's leading derivatives marketplace, suspended trading operations following a critical cooling malfunction at its CyrusOne data centers. The outage impacted electronic platforms handling futures and options on interest rates, equities, commodities, and FX, halting pre-open sessions during peak activity hours.
Response and Impact
CME support teams are actively addressing the technical disruption, promising rapid resolution and client updates on pre-open resumption. Such incidents highlight data center resilience challenges in 24/7 global trading environments, potentially delaying billions in contracts while failover systems activate.
Key Highlights
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Cause: Cooling system failure at CyrusOne data centers.
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Scope: Multiple CME markets (futures, options) affected.
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Timeline: Halted November 27; resolution "in near term."
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Client Advisory: Pre-open details to follow; normal ops targeted soon.
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Context: Rare but critical; echoes past tech glitches.
Sources: StreetInsider/Reuters, Marketscreener, Reuters.