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    How to know if an option leg is expensive?

    How does one know if the price of an options leg is expensive or not? Is looking at the IV of that strike relative to its historic IV the only way to do it?
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    NDX options fills and liquidity

    By NQ you mean NDX?
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    NDX options fills and liquidity

    QQQ is not part of 1256 contracts. So taxes are high. Also QQQ is cheap, so commissions will be high. I do regular strategies but with far away expirations so that gamma is less and margin is less
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    NDX options fills and liquidity

    I trade expirations which are at least 6 months away. Even though SPX does not have much volume that far away the fills are still good. I trade in 1:2, 1:3 or 1:2:3 ratios. How is NDX 6 months away? Do we have to give up few more cents from mid than SPX to get filled?
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    Has the correction begun?

    Yes, if they never sold, they never lost because the market is UP overall from any point in US history.
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    Portfolio Margin vs SPAN Margin

    Actually I have been doing proper risk management for a long time. But, only with PM. I do not have any idea about SPAN. Trying to learn the exact algorithm which SPAN uses. It looks very similar to what PM uses with sticky delta and sticky strike.
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    Portfolio Margin vs SPAN Margin

    Thanks. Will do. No, I am not a naked options seller. I usually trade multi-leg trades. I was trying to decide between SPX and ES. SPX has the advantage of being an 1256 contract which make taxes cheaper.
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    Portfolio Margin vs SPAN Margin

    I have to choose between /ES Futures Options and SPX Options. I am trying to see where leverage for options is more? In Portfolio Margin for SPX or SPAN margin for /ES Options? I trade with TDAmeritrade.
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    How much did it take to become more or less consistent for you?

    Yes I know she cheated.and her strategy was very risky. I was just talking about the fact that she got millions of dollars worth of contracts filled. I was just talking about scalability of SPX options.
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    How much did it take to become more or less consistent for you?

    Many are talking about scalability here. I am worried about it as well. I trade index options like SPX. The returns are good, but worried about scalability. I know some are able to scale this to millions of dollars. I heard Karen the supertrader was trading index options with 100 million dollars.
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    How much did it take to become more or less consistent for you?

    Your strategy is with stocks, options or forex?
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    How much did it take to become more or less consistent for you?

    How is your consistency till 2019? Still above 200% per year? Does your strategy scale to millions of dollars?
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    Options Spread Orders Execution

    Are delta neutral trades better at getting filled with a market maker? I can split my trades in such a way as to create multiple delta neutral entries.
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    Where to find American calculations for Black-Scholes

    Any update on this? I am looking for it as well. I am interested in 2nd order derivatives like Vanna and Vomma as well.
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    Where to find American calculations for Black-Scholes

    Can you send me the code as well?
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    Client library for TDAmeritrade?

    Is there a client library for TDAmeritrade for order execution? Or should I write one from scratch using their API?
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    Code for Sticky Delta & Sticky Strike

    Is there any library I can use, to calculate the margin required for an options trade using Sticky Delta and Sticky Strike method?
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    Code to calculate Margin using TIMS model?

    How do you trade options without a broker? You directly place orders with OCC? Is that possible?
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    Code to calculate Margin using TIMS model?

    If calculating margin is so difficult, then is there a way to programmatically back test strategies without calculating margin for portfolio margin accounts?
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    Code to calculate Margin using TIMS model?

    Is there a simple way to calculate margin using TIMS? We have to vary the underlying price and change IV to simulate what would happen.
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