New Circuit Breakers to Be Implemented to Prevent Another Flash Crash


electronic trading New circuit breakers will take effect next week on the NYSE aimed at preventing another "flash crash." Under this new system, halts are triggered based on where the price of the stock was trading during the previous five minute period. They will be in effect from 9:45 a.m. to 3:35 p.m.

During the crash of May 6, some stocks crashed to near zero. For example, Accenture (ACN) plunged from $40 to an incredible penny per share.

Traders have mixed feelings about the new rules. Some say that those with high-speed computers will be able to sniff out when the circuit breakers will kick in, leaving traders on slower platforms with open positions.

Many traders question whether the circuit breakers will work at all. With the 10% rule, in a fast market a stock may move up or down more than 10% before the circuit breaker kicks in.

Then there is the problem of handling executions. In commodity markets during fast trading, brokers are not held on limit orders. Often a commodity will trade through your price and you must accept the lower price. Whether this will be the case in the stock market remains an open question.

And now for the granddaddy of all kinks. This ban only covers trading when the NYSE is open. It does not cover the electronic overnight trading. We could wake up to a market that has already crashed. The SEC must deal with electronic trading in overnight sessions.

Do you believe that these new circuit breakers will work?

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Last updated: February 08, 2012: 01:31 PM

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