The first regulatory changes following the May 6 "flash crash" were approved on June 10 by the SEC, instituting single stock circuit breakers on a trial basis through Dec. 10, 2010. The call for circuit breakers on individual stocks came after none of the market-wide circuit breakers were tripped on May 6.rnUnder the new regulation, trading in a stock that has dipped 10% in a five-minute period will be frozen for five minutes. According to the SEC press release, "The pause, which would apply to stocks in the S&P 500 index, would give the markets the opportunity to attract new trading interest in an affected stock, establish a reasonable marketrnprice, and resume trading in a fair and orderly fashion."
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