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Sell Limits
You use stops or trailing stops when you want to sell a stock at a loss from its highest price; it's merely a method of safety that ignores any potential upside. That said, I believe that an 5-12% trailing-stop order is able to limit losses from gyrations in individual stocks. However, if the market tanks and you own a good stock, than you will miss out on that stock's returns because you sold it prematurely. However, a stock like TEVA that was trading at over $40 per share and dropped below $33 (it fell all the way to $29.83 from $45.91 per shaer and now trades at $38.12 per share) would have been good to sell at $38 per share and then when it fell below $33 to rebuy that stock. Off course, an over 20% drop in the price of a great stock is unusual and those opportunities don't come knocking on your door. You've got to go find them and by investoe's estimates, you have only a 15% chance of being successful of beating the market.
I've used trailing stops of 2-10% (mostly between 5-8%). I've sold CBH for a slight gain on a 2% trailing stop. I would use a trailing stop that is <5% if you truly want to sell the stock but are attempting to get the best possible price for that stock. The price needs to be above what it's normal (such as 2-3 times its normal) daily gyration will be. For example, CBH may gyrate 1.75% so 1.96% was above that 1.75% gyration.
Never put your trailing-stop on auto-pilot. During times of excessive trading (such as a 400 point drop in the Dow), the price that you sell the stock at and the actual price you receive (will be much lower). On the other hand, you may have wanted to buy at that price (not sell). That's the downside of a trailing-stop; you sell at an inopportune time and at a lower price than the trailing stop. A similar thing would happen if the company files for Chapter 11 bankruptcy protection in which the stock drops to near zero (and renders your trailing stop ineffective).
But enough of my speal, I think an 8-10% trailing stop is what most people should use.
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