(Bloomberg) — An apparent glitch at the operator of the New York Stock Exchange triggered volatility trading halts in about a dozen companies, including Chipotle Mexican Grill Inc.

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NYSE confirmed in a statement that it was having issues.

“NYSE Equities is currently investigating a reported technical issue,” the firm said in a statement. “Additional information will follow as soon as possible.”

Representatives for NYSE didn’t immediately provide a comment. Index provider Intercontinental Exchange Inc. is the owner of the New York Stock Exchange.

Chipotle was down 1.2% at 9:44 a.m. when it was halted. Volatility halts are normally triggered by a series of factors, most commonly for rapid and large changes in price and volume. Horace Mann Educators Corp. and Franco-Nevada Corp. also were halted despite appearing to move less than 3%.

The glitches come a week after US stock exchanges switched to one-day settlement.

On Thursday, a computer error prevented prices from printing on the biggest US equity index for over an hour, but did not affect individual stocks and resulted in only minor disruptions.

–With assistance from Katherine Doherty.

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