I thought that OI and volume should run parallel. But I always find that the numbers don't run parallel. Why is it so?

    Disparity between OI and volume on an options chain
    byu/minding_money inoptions



    Posted by minding_money

    2 Comments

    1. Volume is just activity of contracts traded in a given day. Each transaction executed adds to volume, but not necessarily to OI – particularly if a new buyer purchases from an existing seller. This doesn’t add to the amount of open contracts, just shifts it around.

      But if someone new says I want to sell a CC on this ticker, and a new buyer wants to buy it, that creates volume and OI together.

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