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The CME Group suspended trading across several major markets after a cooling failure at its data center partner CyrusOne caused a widespread systems outage late on November 27.
The disruption, which emerged amid thin post-holiday liquidity conditions, forced core platforms offline, leaving traders without access to real-time pricing.
Cooling Malfunction Freezes Key Electronic Markets
According to CME Group, the technical issue at the CyrusOne facility affected infrastructure supporting CME Globex, EBS, and BMD, halting activity across futures, options, and foreign exchange markets.
The exchange posted its first alert at 20:40 CT, noting that teams were working to restore services.
“Our markets are currently halted due to a cooling issue at CyrusOne data centers,” CME said in repeated status updates. The exchange added that it would provide pre-open guidance once systems were stable.
Market Data Stalls During Low-Liquidity Asian Hours
The outage occurred at a particularly challenging moment for global markets. Specifically, liquidity was already thin after the Thanksgiving break, creating conditions where even small disruptions can have a large impact.
According to data from LSEG, pricing for major equity and currency benchmarks stopped updating around 03:44 GMT.
With markets stuck, traders across the Asia-Pacific region reported being unable to hedge positions or execute orders amid heightened volatility. Reuters reported that the freeze affected key contracts, including the S&P 500 and Nasdaq 100 futures.
Commenting on the impact, Tony Sycamore of IG Markets said, “This hasn’t helped at all, especially on a day when there was real interest to transact.”
Outage Follows Recent Technology Upgrades
The breakdown comes months after CME expanded its technology partnerships to strengthen operational resilience. For instance, in March, the exchange announced a collaboration with Google Cloud to explore cloud-based efficiency tools, including tokenization and distributed ledger technologies.
At the same time, CME continued to diversify its product offerings. The exchange recently unveiled new spot-quoted crypto futures for XRP and Solana, which are expected to launch on December 15, pending regulatory approval.
Despite the current disruption, CME has reported record activity in crypto and U.S. Treasury markets. Its stock is up more than 20% this year, extending strong returns for long-term investors.
CME Working Toward Full System Restoration
CME said its technical teams remain focused on bringing all markets back online. At the time of publication, the exchange has not provided a timeline for full service restoration. However, it continues to issue rolling updates.
Meanwhile, clients have been urged to monitor official channels for pre-open announcements and further instructions.