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Good point. Indeed, I try also to check whether I am a looking at one leg of a vertical spread, to a rollover or a contrarian transaction on the underlying and so forth.

Absolutely. I try to keep truck of the sentiment on a given Underlying also by looking at where the big money goes. So it is important to check if someone else sold (bought) to an institution buyer (seller) or to someone else who has simply a different opinion.

That makes sense. Thank you.

Sure. I use iqfeed mainly to get Times&Sales of US option and Underlying data. Apart from cases like this, iqfeed over the years has proved to be a relatively cheap source of reliable data. Their support forum is quite responsive, but if you want to have access to their API you need to pay a...

My data vendor (iqfeed) reports it as one transaction. I don't expect them to aggregate the data, but I agree with you that you can see this kind of oddities every now and then.

Thank you, Robert. (You are always on duty :) ) That's my point. If someone closed 112 contracts, the OI interest should be way below 186, not a small reduction of only 3 contracts to 183.

I was reviewing the following trade on AA190418P00039000 made this year on January 16, where apparently 112 options were bought. It was the only trade made that day on this option. I am a little puzzled because the open interest before the trade was 186 and then, the day after, became only 183...

Glad that he took the prize. With his brother started a quite successful option monitoring program, spotting unusual option activity in the US market. I learned a lot from him, first on seeking alpha and then on optionmonster. After he sold his business to TS, I see he is still continuing to...

Interesting thread. Thanks for pointing it out.

Thanks Bob. I'll have a look.

Good point. The answer however is no, because, unless a plane hits the world trade center, I end up buying anyway an option at a price I am comfortable with. If I look at more than one year of completely manual implementation of this strategy, I have got much more damage from manual mistakes and...

Absolutely. I completely agree with you, Robert. I would be perfectly happy with a software populating the order mask with pre-filled orders waiting for manual approval. I don't have this software and it is just what I was asking for.

Thank you. Generally I get the opposite problem: I am rarely filled because I place my order at least two ticks below the bid. Anyway, no problem with multiple fillings because I allocate only a tiny fraction on my trading capital when doing this kind of transaction. So my broker will kill my...

My strategy daily ouputs about 10 recommendations on taking long or short positions on a given underlying using options. It also recommends the range of expirations dates as well as the range of strikes and the IV (or the bid price) I have to target. So, It is quite a bit of error-prone, order...

no problem

I use iqfeed

I get the times&sales from a commercial vendor and then I try to find meaningful relationships in the data.

How do you know?

Thank you. You guys must have been doing this job for ever to know so many things! It is also nice of you that you share this info with fellow traders. As for myself, I am just trying to measure the market sentiment by looking at this transactions. So I am glad that you confirm that this could...

Thanks for your thoughtful answer, mksl. So, if I read you correctly, this could be considered a short position on the underlying, with some hedging involved. One last question, if you don't mind. Sometimes, I see, instead, a perfect agreement between the stock/option combo (i.e., buy the call...