CME trading halted after CyrusOne data center cooling failure

Sunday, November 30, 2025 at 10:25 UTC+01:00 (+0100), United States, Chicago area

News category : Market Structure and Financial Stability Events

On November 30 a critical cooling failure at a CyrusOne data center supporting CME infrastructure forced a suspension of electronic trading across a broad set of futures and options contracts. The outage affected equity index contracts, currency and interest-rate futures, and many commodity benchmarks, stopping routine price discovery and hedging operations during a key trading window. Brokers and market makers resorted to internal models and alternative venues, widening spreads and elevating execution risk. The incident prompted immediate scrutiny of the resilience of concentrated market infrastructure and triggered urgent coordination between exchanges, clearinghouses and regulators on contingency measures and redundancy improvements.

Overall market impact

Strong bearish market impact - strength score : 92/100

Detailed breakdown of market impact over instruments, sectors, and asset classes

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Impacted instruments :

Equity index futures

Commodity futures

FX futures

Interest-rate futures

Derivatives liquidity

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