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What Is “Open Interest” and How Does It Differ from Trading Volume?

Open interest is the total number of outstanding, unclosed contracts; volume is the total number of contracts traded in a period.
Greeks.Live22.11.25

What Is “Open Interest” and How Does It Differ from Trading Volume?

Open interest is the total number of outstanding futures or options contracts that have not yet been closed, offset, or exercised. It represents the total commitment of traders to the market.

Trading volume is the total number of contracts that have changed hands during a specific period, typically one day. Volume measures activity, while open interest measures the number of active contracts in existence.

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