NYSE Euronext plans to reevaluate a program aimed at curbing sudden price swings after about 40 thinly traded securities set off trading halts last week.

NYSE said it will work to refine the system, known as limit up/limit down (LULD), after it briefly stopped trading in some securities only because they had a wide bid-ask spread, according to a release from its Arca unit today. About 530 securities that move 10,000 shares or less per day on average will be removed from the program and return to the old system of circuit breakers.

"NYSE Arca will work with the SEC and other markets to identify the best methodology for incorporating low-volume derivative securities into the LULD plan," Katrina Clay, an NYSE spokeswoman, wrote in an e-mail.

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