# Open interest versus volume: outstanding contracts and completed trades

Open interest counts derivative contracts that remain outstanding. Volume counts contracts traded during a specified period. The same exposure can change hands repeatedly and generate substantial volume without increasing open interest; neither measure alone identifies whether future prices will rise or fall.

Evidence: [Open Interest](https://www.cmegroup.com/education/lessons/open-interest)

Canonical: https://degreesofsatoshi.com/encyclopedia/open-interest-vs-volume/
Published: 2026-10-02
Substantively modified: 2026-10-02
Independently verified by an automated reviewer: 2026-10-02T19:18:00.092Z
Data current through: 2026-10-02

AI-assisted research and drafting with a separate automated source-verification pass; no external expert or named human review is implied.

## Key facts

- **Stock measure:** Open interest describes outstanding contracts at a point in time. ([Open Interest](https://www.cmegroup.com/education/lessons/open-interest))
- **Flow measure:** Volume counts trading during a period. ([Open Interest](https://www.cmegroup.com/education/lessons/open-interest))
- **Different questions:** Turnover and remaining exposure need not move together. ([Open Interest](https://www.cmegroup.com/education/lessons/open-interest))

## Count a matched contract once

In a simplified market, a new buyer and a new seller open one matched contract: volume increases by one and open interest increases by one. There is a long and a short, but this is one outstanding contract, not two.

If an existing long transfers its position to a new buyer while the original short remains, trading volume increases but the outstanding count need not change. When both counterparties close corresponding exposure, open interest decreases.

Evidence: [Open Interest](https://www.cmegroup.com/education/lessons/open-interest)

## Read the unit and timestamp

A dashboard may report contracts, underlying units or a currency valuation. Price changes can alter a currency-valued display even if the contract count is unchanged. Compare like units and the same observation times; a 24-hour volume figure cannot be directly equated with end-of-day open interest.

Evidence: [Open Interest](https://www.cmegroup.com/education/lessons/open-interest)

## Activity is not a sufficient forecast

Every outstanding matched contract has opposing sides. Increasing open interest can accompany different strategies, including hedges and spread trades. CME discusses using it with other analysis; it does not make a standalone count a dependable buy-or-sell signal.

Evidence: [Open Interest](https://www.cmegroup.com/education/lessons/open-interest)

## Questions

### Can volume be high while open interest stays flat?

Yes. Existing exposure can be repeatedly transferred, or openings and closings can offset over the period.

Evidence: [Open Interest](https://www.cmegroup.com/education/lessons/open-interest)

## Claims and scope

### open-interest-vs-volume-quick-answer

Open interest counts derivative contracts that remain outstanding. Volume counts contracts traded during a specified period. The same exposure can change hands repeatedly and generate substantial volume without increasing open interest; neither measure alone identifies whether future prices will rise or fall.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### open-interest-vs-volume-fact-stock-measure

Stock measure: Open interest describes outstanding contracts at a point in time.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### open-interest-vs-volume-fact-flow-measure

Flow measure: Volume counts trading during a period.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### open-interest-vs-volume-fact-different-questions

Different questions: Turnover and remaining exposure need not move together.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

## Sources

- [Open Interest](https://www.cmegroup.com/education/lessons/open-interest) — CME Group. Definition of outstanding contracts; not a forecast of price direction. Locator: Understanding Open Interest. Retrieved: 2026-10-02T18:57:10.036Z.

## Revision history

- 2026-10-02: First publication after primary-source research and separate automated verification.

## Cite this entry

Degrees of Satoshi editorial project. “Open interest versus volume: outstanding contracts and completed trades.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/open-interest-vs-volume/