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By Barbara Kollmeyer

CyrusOne says a cooling issue at a Chicago-area data center had impacted customers, including CME

The CME said Friday that futures trading has been halted for several markets due to a technical problem.

U.S. equity futures were finally back up and running just ahead of the opening of regular trading on Friday after a glitch at a data center in Chicago knocked markets out for several hours.

The outage had affected futures and options markets for stocks, commodities, as well as the EBS foreign-exchange platform and another for fixed-income trading. “All CME Group markets are open and trading,” the exchange said in a statement on X.

CME had blamed the outage, which began hours earlier, on a cooling issue at a data center. In an emailed comment to MarketWatch, a spokesperson for CyrusOne said it had been responding to a cooling problem at its CHI1 data center facility in the Chicago area affecting certain customers, including CME.

“On November 27, our CHI1 facility experienced a chiller plant failure affecting multiple cooling units. Our engineering teams, along with specialized mechanical contractors, are on-site working to restore full cooling capacity. We have successfully restarted several chillers at limited capacity and have deployed temporary cooling equipment to supplement our permanent systems,” said the spokesperson.

The world’s biggest operator of derivatives exchanges, the CME also runs the New York Mercantile Exchange and the Chicago Board of Trade. Futures for the Dow Jones Industrial Average (YM00) , S&P 500 (ES00) and Nasdaq-100 (NQ00) were moving modestly higher.

The CME also had a major outage in early 2019, which halted trading across all of its platforms, but equity futures trading was down for three hours, as opposed to Friday’s seemingly much longer outage.

The stock market was already set for a shortened day of trading on Black Friday, with the New York Stock Exchange and the Nasdaq exchange due to close at 1 p.m. ET, following Thursday’s Thanksgiving Day closure. Volumes tend to be lower on the day after the holiday, which can mean even small orders could cause big swings.

The Dow Jones Industrial Average DJIA and S&P 500 SPX each finished up nearly 0.7% on Wednesday, bringing week-to-date advances to 2.6% and 3.2%, respectively. Both indexes were on track for their strongest Thanksgiving-week performances since 2012, based on preliminary data from Dow Jones Market Data. The Nasdaq composite finished 0.8%, bringing its week-to-date gain to 4.2% and on track for its best Thanksgiving-week performance since 2008, when it rose 10.9%.

Read: Stocks stage powerful comeback ahead of Thanksgiving. It wasn’t enough to erase November’s losses.

-Barbara Kollmeyer

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  11-28-25 0915ET
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