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Open interest

Open interest is the number of outstanding option contracts that have not been closed or exercised. It is not the same as daily volume.

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Why it matters

OI helps see where contracts remain open. Like IV, it requires an exchange/OPRA-style feed RomeWay Hosted does not carry.

How RomeWay uses it

OPT panel prints — rather than scraping unofficial OI.

FAQ

Volume vs open interest?
Volume is contracts traded today; open interest is contracts still open after settlement.