I have to admit that I never used a trailing stop order before. I have lots of long stock and figured that in in this market a trailing stop would fit m long strategy. I figured that using a rather than $ stop would be best. I want to avoid selling just from daily volatility. I could not find out how to determine the range of up and down during a certain period. For example what was the max down during one day during the last six months for SIRI?