Excellant post - here is a little more: htt

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[/The alternative uptick rule (Rule 201) approved today imposes restrictions on short selling only when a stock has triggered a circuit breaker by experiencing a price decline of at least 10 percent in one day. At that point, short selling would be permitted if the price of the security is above the current national best bid.

Rule 201 includes the following features:

•Duration of Price Test Restriction: Once the circuit breaker has been triggered, the alternative uptick rule would apply to short sale orders in that security for the remainder of the day as well as the following day.

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https://www.sec.gov/news/press/2010/2010-26.htm

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