The SEC has amended Regulation SHO to include a short sale price rule that will be triggered by a significant drop in a security's price. Under new Rule 201, trading centers will be required to establish written policies and procedures designed to prevent short sales of a covered security at a price that is less than or equal to the current national best bid, whenever the price of that security decreases by 10% or more from its closing price on the prior day. Once triggered, the price restriction will remain in place for the remainder of the day and the following trading day. Please see the Winston & Strawn Client Briefing on this topic. Client Briefing. 75 FR 11231.