I had been led to believe that SSFs would trade in close relation to the movement of the underlying. That has been promoted as a big advantage over an option. However, a few days ago I took a long SSF contract in BAC when it tanked, as an experiment. Since then, the stock has rallied 3 percent and the SSF hasn't budged. In fact, the SSF is actually down (!) slightly. What is particularly bothersome is that the SSF is showing a decent number of contracts being traded, so I don't think it is a liquidity issue. I was looking forward to using SSFs on selected stocks. But not after this debacle. I'd be interested in knowing of other experiences with SSFs.