A major data center outage halted futures and options trading early Friday, leaving investors in the dark for more than 10 hours.

CME Group, a Chicago-based exchange operator, said trading had resumed mid-morning Friday in futures tied to US stock indexes, Treasurys, gold, crude oil and other major markets.

That was after a data center in Illinois, owned by the Cyrus One firm, overheated on Thursday night, sparking the longest such outage in years.

The holiday-shortened session over the Thanksgiving period means trading is tradtionally much lighter, but it left brokers flying blind as many were reluctant to trade contracts with no live prices overnight.

The cooling problem spared other exchanges like NYSE and Nasdaq, where stocks traded normally in premarket.

“It could have been a l

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