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I am the owner of Historical Option Data com. I have looked at their data. It exactly matches mine. (Even the greek values I calculate each day) (Meaning they have no authorization to be selling my data !!) So far, I believe they are selling stolen property. We are in the vendor list under...

I think what you are after may only be good for backtesting. But in real trading, you should be able to tell which are the most active by looking at several factors. These would be: bid/ask spread. If it is wide, then you are just trading against the market maker. Open Interest for a specific...