Does anyone know how the margin on these securities will work? I know they agreed to 20% of the underlying value of the contract... e.g. 5 contracts * stock is 50 * underlying 100 = $5000 margin Isn't future margin calculated intraday? How often? What happens when you get an intraday call? (send $ or sold out?) Does Reg-T apply to SSF? Do daytrading rules apply? 4 round turns in 5 days? Do they have to be held in a special acount like shorts? Any other insight??