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.
The total number of derivatives contracts traded that have not yet been liquidated either by an offsetting derivative transaction or by delivery. Related: Liquidation.
The total number of futures contracts or option contracts that have not yet been exercised, expired, or fulfilled by delivery.
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.