Definition 1.
1. The total number of options or futures contracts that are not closed or delivered on a particular day.2. The number of buy market orders before the stock market opens.
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Definition 2.
The total number of derivatives contracts traded that have not yet been liquidated either by an offsetting derivative transaction or by delivery. Related: Liquidation.
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Definition 3.
The total number of futures contracts or option contracts that have not yet been exercised, expired, or fulfilled by delivery.
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Definition 4.
The number of contracts outstanding for a given option or commodities future. Open interest is a measure in literally how much interest there is in a particular option or future, and is reported in the financial press.
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