Technical glitch halts trading on Chicago Stock Exchange

The Exchange blamed the trading halt on an unspecified "technical issue." The trading suspension began at 9:20 a.m. ET, according to an alert.

No impact is expected to the broader market because the Chicago Stock Exchange handles less than 1% of all US stock trading, according to the Cboe Global Markets.

"We expect to resolve the issue and resume trading shortly," a spokesperson from Intercontinental Exchange, which owns the Chicago venue, told CNN Business in an email.

Complete trading halts are relatively uncommon, but when they have happened in the past, orders are routed to other exchanges. The Chicago Stock Exchange is dwarfed in size by the New York Stock Exchange and Nasdaq.

"They're such a small piece of the puzzle," said Joe Saluzzi, co-founder of brokerage firm Themis Trading and author of "Broken Markets." "If this was Nasdaq, that would be a bigger problem."

The Chicago Stock Exchange reached a deal earlier this year to be sold to Intercontinental Exchange (ICE), which also owns NYSE. The buyout came after the SEC rejected a planned sale of the Chicago Stock Exchange to a Chinese-led group.

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