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One of the company told me that as soon as your equity is down to 20% then you have to 'pay up' the next day. I assume it is by closing the positions. Overall, the margin formula seem to be secret. ANyoe has some PM accountexperience that can share. Frank

I have seen SpeedTrader and LightSpeed both offering the -8/+6. I'll confirm with them. The other issue is that is it a good idea to split the $$ among different brokers to their insured cash limit (250K?). That way, I'll be in a 100% safe zone for long term. For short option trading...

I take the SPX down 50 points in the calculator and the Aug 1000P is now 150K. The commission is 10x less but the margin will be a killer also. My broker has a 10%/10%. I am looking for a better broker with a -8%/+6% and my target is SpeedTrader. Their commission rate is also very good. Can...

Dolemite, Looking at a 60 days out example - Aug1000P for 100 contracts the margin is 75K. Premium is $1.55 last trade. 1.55/11weeks = 1.55/11 = 0.15 per week. How do you assess the risk between a weekly and a longer expiration term option. As I am typing, SPX dropped to 1279.64, margin...

Very true, I have seen a margin jump of 4K to 89K when price jump from 0.10 to 0.15. Is there a way to predict this one? The supplied margin calculator can only calculates the change of stock/index value.

MMMnnn.. just check... 30 @ 0.05 and not 0.1...

Must be lucky today, sold some @ 0.10.

Look at the SPX put option at this moment -> SXP = 1295, Friday's 1170P has 0.15 last trade. So, 2 days from expiration for a 125 SPX point away is too risky? Frank

I used to trading in a regular margin account and I can only trade 60 option contracts (e.g. $1) . After I open a portfolio margin account now I can trade 600 contracts of the same option but at a much lower strike (selling puts) (e.g. $0.1) I pay more commission ($45 vs $350) but seem like it...