--Nasdaq cancels pre-market trades in eight companies

--Exchange cuts trades from 9:29 a.m. through 9:30 a.m. EST marked at more than 10% from Wednesday's closing price

--Big names affected include Goldman, Citigroup and AT&T

(Updates with comment from BATS Global Markets in the fourth paragraph.)

   By Kaitlyn Kiernan 

NEW YORK--Nasdaq OMX Group (NDAQ) canceled some premarket trades in eight companies Thursday, including Citigroup Inc. (C), Goldman Sachs Group Inc. (GS), and Hewlett-Packard Co. (HPQ), according to a trader notice from Nasdaq.

The exchange operator said it will cancel all trades in the eight names that priced more than 10% from Wednesday's closing price during the last minute before the open Thursday, according to the notice. The decision follows an earlier announcement that Nasdaq was looking into potentially erroneous trading activity between 9:29 a.m. and 9:30 a.m. EST in more than a dozen companies.

After first advising traders to look into their trading activity for trades that could be marked as "clearly erroneous," Nasdaq later said the exchange "will be canceling trades on the participants behalf."

A New York Stock Exchange representative said it wasn't affected and isn't canceling any trades. A spokesman from BATS Global Markets said the exchange didn't have affected trades.

Other companies whose shares were affected include AT&T Inc. (T), Western Union Co. (WU), Wells Fargo & Co. (WFC), Kroger Co. (KR), Ventas Inc. (VTR) and Sprint Nextel Corp. (S).

It was the second time this week that issues have arisen regarding trading ahead of the market's 9:30 a.m. EST open. On Wednesday, confusion over dividend payments to holders of shares of fiber-optics firm Tellabs Inc. (TLAB) was suspected to be behind sharp swings in its shares. Some investors appeared to think the cutoff for receiving the dividend was this week as opposed to later this month.

Write to Kaitlyn Kiernan at kaitlyn.kiernan@dowjones.com

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