Volume/OI Ratio
Today's volume divided by open interest. High ratios may indicate new positions being established.
The Volume/OI Ratio compares today's trading activity to the total outstanding contracts. It helps identify whether options activity represents new positions being established or existing positions being closed.
Interpreting the Ratio
- Ratio > 1.0: Today's volume exceeds total open interest - significant new interest
- Ratio 0.5-1.0: Active trading, mix of new and closing positions
- Ratio < 0.5: Normal activity relative to existing positions
Why It Matters
A high Volume/OI ratio often signals unusual options activity. When traders establish new positions (rather than closing existing ones), it suggests conviction about future price movement.
Bullish Signals
- High Vol/OI on calls with volume at the ask (buyers paying up)
- Concentrated at specific strikes, especially OTM
Bearish Signals
- High Vol/OI on puts with volume at the ask
- Increased activity across multiple put strikes
Limitations
The ratio alone doesn't tell you:
- Whether positions are opening or closing
- The direction (buy vs sell)
- Time frame of the traders
That's why professional traders combine Vol/OI with bid/ask analysis and open interest changes to build a complete picture of market positioning.
See it in Action
Volume/OI Ratio is used throughout our options analysis platform to help you make better trading decisions.
Related Tools
Related Terms
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