Can anyone help me with the math TOS is using? I will keep it simple and talk in single lot fly terms. I have a 50 wing iron fly in SPX. The credit was 41.10 so that means no matter what I can't lose more than $890 but TOS is saying that if we move 2sd down the margin would bump to $4400? I emailed them and was given the standard 10%/12% margining and call their margin dept tomorrow but I am just curious before I waste all the time tomorrow I am not missing something simple.