The SEC announced today that it passed the proposed circuit breaker rules for all exchanges. It released separate orders for FINRA and other SROs and electronic trading exchanges. As a primary component of the rules, circuit breakers will now be triggered if a stock falls 10 percent or more within a five-minute period. In that situation, trading in the security would be halted for five minutes. The rules apply to all S&P 500 stocks and implementation will begin as soon as Friday, June 11, 2010. The rules will be in effect through December 10, 2010 as a pilot study.