Open Interest (OI)
A practical explanation of “Open Interest (OI)” in options trading—what it means and how traders use it.
Quick facts
| Field | Value |
|---|---|
| Category | Options Trading Terminology |
| Use | Learn vocabulary to read chains and manage risk |
Definition
“Open Interest (OI)” is a commonly used term in options markets. Traders use it to describe contract behavior, risk, execution, or market structure. The most important part is how it changes your payoff or decision-making.
Why it matters
- Helps you interpret the option chain and price behavior
- Improves communication and clarity when planning trades
- Reduces mistakes caused by misunderstanding contract mechanics
Quick example
Info
Try to connect the term to one of these: price direction (delta), time (theta), volatility (IV/vega), or execution (orders/liquidity).
Summary
- Use “Open Interest (OI)” to describe risk/behavior clearly.
- Always pair terminology with a trade plan (entry, exits, size).