a standard stop loss isnt guarenteed... so if your standard stop loss was at $8, and the sp at $10... if the company announced before the market opened something really bad and the pre market price and open price gaps down to say $4, your standard stop loss will close out your position at $4 (the price it opens at), not $8... but a guarenteed stop loss is guarenteed to sell at $8, no matter what the company sp opens at,, cheers
