June 1, 2012
SEC Approves Plans to Address Extraordinary Stock Volatility
The SEC approved two proposals submitted by the national securities exchanges and FINRA that are designed to address extraordinary volatility in individual securities and the broader U.S. stock market.
One initiative establishes a “limit up-limit down” mechanism that prevents trades in individual exchange-listed stocks from occurring outside of a specified price band. When implemented, this new mechanism will replace the existing single-stock circuit breakers that the Commission approved on a pilot basis after the market events of May 6, 2010.
The second initiative updates existing market-wide circuit breakers that when triggered, halt trading in all exchange-listed securities throughout the U.S. markets. The existing market-wide circuit breakers were adopted in October 1988 and have been triggered only once, in 1997. The changes lower the percentage-decline threshold for triggering a market-wide trading halt and shorten the amount of time that trading is halted.
The exchanges and FINRA will implement these changes by February 4, 2013, for a one-year pilot period. Additional information, including the approval orders, are posted on the SEC website.
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