Volume & Open Interest Heatmap
Last reviewed: by Options Analysis Suite Research.
How Do Volume and Open Interest Differ?
When to Use This
Best for: Identifying the most actively traded strikes and where large positions sit
Market condition: Valuable in all conditions; combines the "what happened today" (volume) with "what's been built up" (OI)
Example: TSLA shows heavy volume at the 250 call (20K traded) but only 5K OI. Volume/OI ratio of 4.0 suggests aggressive new positioning at this strike today
The Volume & Open Interest view combines two complementary datasets into a single heatmap visualization. Volume shows today's activity (what's being traded right now), while OI shows the accumulated positioning (what has been built up over time). Together, they paint a more complete picture than either metric alone.
What Are the Key Metrics?
- Volume/OI Ratio: Daily volume ÷ open interest at a strike. A ratio above 1.0 means more contracts traded today than currently exist, indicating aggressive new activity or rapid turnover.
- Volume concentration: Which strikes attracted the most trading today. Clustered volume at a specific strike suggests block trades or institutional activity.
- OI distribution: The shape of OI across strikes reveals the market's aggregate position structure: wide distributions suggest spread activity; concentrated peaks suggest directional bets.
How Is This Used in Trading?
- Unusual activity identification: High volume/OI ratio at a strike that didn't previously have significant OI signals new position building
- Confirmation: Use volume concentration to confirm support/resistance levels identified by OI analysis
- Roll tracking: Watch for volume spikes at near-term strikes paired with OI increases at next-month strikes; signals institutional rolls
Limitations and Caveats
- Volume includes all transaction types (opening, closing, adjustments, exercises)
- OI is delayed by one day; today's volume won't be reflected in OI until tomorrow
- Heatmap visualization may obscure absolute magnitudes if the color scale is auto-normalized
Explore live volume and OI data: SPY · /ES · BTC-USD
Related Screeners
Unusual Activity: breadth count of contracts with vol/OI > 2 AND vol ≥ 500 · Unusual Call Activity · Unusual Put Activity: call/put directional split · Highest Open Interest · Biggest Put/Call Change
Related Concepts
Open Interest · Volume History · Dealer Gamma · Max Pain · Dealer Positioning · Unusual Activity
This section is part of the Options Analysis Suite Documentation. Explore the full Charts & Analytics hub for every options analytics view.