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PM in the USA.

I downloaded the software and logged in to paper trading. No option to change margin to Portfolio Margin.

Is it possible to demo a portfolio margin account with paper trading?

Any good brokers for portfolio margin other than TD Ameritrade and interactive brokers? If they support API based trading it would be better but it's not required.

Do people use tasty works nowadays? I am planning to use them for options for portfolio margin account.

Hi, What sectors has liquid options? Tech sector has NDX and QQQ which have decent options liquidity. What other sectors have good options trading volume so that fills can be good?

Yes, I currently have portfolio margin with TDA.

I am using TD ameritrade with portfolio margin and use their API. I was thinking of moving to IB as the margins from TDA was higher than IB. But in IB there is a 30% margin rule for concentrated positions. Do you know what that means?

I meant the ratio of 50 delta IV to 20 delta IV

It looks like there is a huge IV crush for the past 3 days for SPX Calls. Is that because of low volume? Never seen so much crush so quickly for an index.

Yes. I have the full chain.

I want to know the price of options at 20 delta, irrespective of the presence of a strike exactly at 20 delta.

Can I get the price of options for a symbo, like SPX, for an expiration, like Dec 18 2020, at Delta 20 (even if there is no leg at EXACTLY 20 delta). Where can I get such calculated prices. I am willing to pay for it too. I need the data in real time.

This data too is available for all deltas at multiples of 5 irrespective of existing strikes?

Thanks. Do you also have theoretical price for those deltas or just theoretical IVs?

This is nice. I always need 25 or 50 delta even if there is no leg exactly at 25/50 delta. Today the 25 delta must the much more expensive than 50 delta in SPX than usual.

How do you choose 75 delta and 25 delta? I think you pick the nearest strike. I have had problems with this. For example, sometimes the closest delta to 25d could be 24.5d for several days. Then it could become 25.5d. That fact that historically we had picked 24.5d and today we are picking 25.5d...

I am not getting fills for SPX options 9 months away. It was good till the first half of last month. Is the liquidity low? Are others experiencing the same?

It's IV% of 50delta calls / 25 Delta calls.

@TheBigShort How good is their Forecasting feed? They forecast volatility of every leg.