As my account grow, I found that stop does not work well. I was in 18.11, it went up to 18.40, I set market stop at 18.18. Then it wend from 18.2 to 18.14 within seconds. If I use stop limit, I am worried that my position may not get out quick enough. So for those big traders, how do you use stops? Or you just seperate your account across different stocks?