The Chicago Mercantile Exchange brought all trading to a halt Friday morning after a cooling system malfunctioned at one of its data centers. The outage affected multiple markets and trading platforms across the exchange.
CME halted – not sure when trading will be re-enabled.
Best to take off until morning or even Sunday open. Will update here tomorrow pic.twitter.com/9dgUrgs6jL
— Brett Simba (@BrettSimba) November 28, 2025
CME Group confirmed the halt in a statement released in the early morning hours. “Due to a cooling issue at CyrusOne data centers, our markets are currently halted,” a spokesperson said. The company added that support teams were working to fix the problem but could not provide an immediate timeline for resolution.
The outage disrupted trading across several key markets. Globex futures and options markets stopped functioning along with the EBS foreign exchange platform and BMD markets. By 4:29 AM ET, prices for WTI crude oil futures, US 10-year Treasury futures, and S&P 500 futures had not updated according to LSEG data.
CME Group operates as the world’s largest derivatives exchange by market value. The exchange handles futures and options contracts for agricultural commodities, energy products, metals, and equity indexes.
The data center experiencing the cooling problem is operated by CyrusOne, a company headquartered in Dallas, Texas. CyrusOne representatives were not available for immediate comment about the technical issue.
Emir Syazwan, a futures trader at Ninefold Trading Co. in Kuala Lumpur, Malaysia, described spending hours on the phone with his broker during the outage. He noted that the timing of the halt affected Asian and European trading sessions more directly than American traders.
The outage occurred at the end of the trading week, following the Thanksgiving holiday in the United States. Markets were scheduled to close early on Friday at 1 PM ET. Syazwan said markets had already been trading in a tight range since November 26 around 10 PM EST.
This is not the first time CME has experienced technical difficulties. In 2014, technical problems shut down parts of the CME’s Globex electronic trading system, affecting agricultural commodity contracts.
Last year, Switzerland’s SIX stock exchange temporarily halted trading of equities, bonds, and exchange-traded funds after experiencing data dissemination problems. These types of technical outages remain rare but can disrupt global financial markets when they occur.
Before the trading halt, US stock futures showed modest gains. Dow Jones Industrial Average futures were up 0.1 percent while S&P 500 futures also rose 0.1 percent. Nasdaq 100 futures increased 0.2 percent.
The three major US indexes were heading toward a losing month in November. Both the Dow and S&P 500 were slightly lower for the month as of Wednesday’s close. The Nasdaq was down 2 percent for the month. Megacap technology stocks cooled off during November as investors questioned the pace at which AI companies can generate sustainable profits.
CME said it would notify clients about pre-opening procedures once the cooling issue was resolved. The exchange warned that price movements in affected contracts might take time to appear after trading resumed.
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