By Jesse Westbrook

May 11 (Bloomberg) — NYSE Euronext and Nasdaq OMX Group Inc. support temporary halts for individual stocks when they fall 10 percent or more over preset time periods.

Single-stock circuit breakers may help prevent selloffs such as last week’s 998.5-point plunge in the Dow Jones Industrial Average, NYSE Chief Operating Officer Larry Leibowitz and Eric Noll, vice president for transaction services at Nasdaq, said in congressional testimony today.

To contact the reporter on this story: Jesse Westbrook in Washington at jwestbrook1@bloomberg.net

Last Updated: May 11, 2010 18:55 EDT

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