What Is Open Interest (OI)?
Open interest = total number of outstanding futures contracts that have not been settled. It measures the money flow into or out of the market.
The 4 OI scenarios
| Price | OI | Signal | Interpretation |
|---|---|---|---|
| ↑ Rising | ↑ Rising | Strong uptrend | New money entering. Longs are building. Trend likely to continue. |
| ↓ Falling | ↑ Rising | Strong downtrend | New shorts piling in. Selling pressure increasing. Bearish. |
| ↑ Rising | ↓ Falling | Weak rally | Short covering, not new longs. Rally may not hold. Cautious. |
| ↓ Falling | ↓ Falling | Weak drop | Long liquidation, not new shorts. Drop may stabilise. Neutral. |
OI vs Volume — the difference
Open Interest
- Count of open contracts right now
- Increases when new contracts created
- Decreases when contracts closed/liquidated
- Resets only when positions close
Volume
- Total contracts traded in a period
- Resets every 24 hours
- High volume = high activity (any direction)
- Doesn't tell you net positioning
OI danger zones
- Very high OI + extreme funding: Overleveraged market. One move can cascade into mass liquidations.
- OI spike on low volume: Often means a large whale opened a position — watch for sudden moves.
- OI collapses suddenly: Mass liquidation event. Usually marks local bottom (longs wiped) or local top (shorts wiped).
- OI grows during sideways price: Coiling spring. Large move likely coming in either direction.
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