Nasdaq OMX Group and NYSE Euronext notified customers this week that "circuit breaker" measures intended to prevent significant market swings might be delayed to April 8 to give firms more time to adjust. The measures, originally scheduled to go into effect in early February, are a response to the 2010 "flash crash." Register today to take advantage of early bird-rates for SIFMA's Tech 2013, June 18-19 in New York City.

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