How to read an open interest heatmap beside options flow
An open interest heatmap shows where outstanding call and put contracts sit across strikes using the latest cleared daily figures. Options flow shows activity occurring during the current session. Read them on separate clocks: use the heatmap for existing positioning context and intraday premium or volume for what is changing now.
- Open interest
- Outstanding contracts after clearing
- Update cadence
- Once daily, not intraday
- Options flow
- Executed activity during the selected session
- Heatmap job
- Compare concentration across strikes
- Cannot establish
- Direction, ownership or the full position
What does an open interest heatmap show?
An open interest heatmap converts a strike-by-strike table into a visual concentration map. Larger cells show more outstanding contracts for the selected call or put series, making nearby clusters and expiry differences easier to compare.
Read the supporting context
The number is the same open interest available in a chain table; the heatmap changes the presentation, not the measurement. Each open contract still has a long and a short side, so the total does not reveal which participant carries the directional exposure.
Why do open interest and options flow run on different clocks?
Options flow is built from trades as they occur during a session. Open interest is calculated by OCC after opening, closing, exercise and assignment records are consolidated through clearing. The latest figure displayed intraday therefore describes the prior completed clearing cycle.
| Measurement | What its timestamp means |
|---|---|
| Intraday options flow | Executed premium, volume and trade count from the current session |
| Published open interest | Outstanding contracts after the latest completed clearing cycle |
| Next open-interest change | The first cleared evidence of whether total outstanding positioning grew, fell or transferred |
How should an open interest heatmap be read with today's activity?
Start with the settled map, add today's activity, then wait for the next cleared figure before describing a change in outstanding positioning. This prevents intraday volume from being treated as if it were already open interest.
- Mark the largest call and put open-interest clusters around the current price.
- Overlay today's premium and volume by strike without adding them to open interest.
- Check trade count and execution location for the structure of the activity.
- Look across neighboring strikes and expiries for possible related legs.
- Review the next published open-interest change before describing new or closed positioning.
Why does high open interest not reveal direction?
Every outstanding contract has both a buyer and a seller. A high call-open-interest strike can include covered calls, spreads, hedges and directional positions at the same time. A high put-open-interest strike can reflect protection, put writing, spreads or other structures.
Read the supporting context
The heatmap reliably shows location and scale. Direction and purpose require additional evidence and often remain unresolved even after the next daily change is available.
What does the next open-interest update add?
The next update shows whether outstanding contracts increased, decreased or remained similar after the session's trades cleared. An increase supports the narrower statement that more contracts remained open; it still does not identify the owner, pair separate spread legs or establish an expected price move.
Common questions
What is an open interest heatmap?
An open interest heatmap is a visual grid of outstanding option contracts by strike, expiry and call or put side. It makes concentration easier to compare than a row-by-row chain.
Is open interest updated in real time?
No. OCC calculates open interest through the clearing process, and the published figure updates once daily. Intraday dashboards use the latest completed daily value.
Is options volume added directly to open interest?
No. Volume counts contracts traded during the session. Open interest changes only after opening and closing activity, exercise and assignment are netted through clearing.
Does high call open interest mean the market is bullish?
No. Every open call has a long and a short side, and the contracts may belong to covered calls, spreads, hedges or directional positions. The heatmap shows concentration, not intent.
Where is the open interest heatmap in Realtime Options?
The Open Interest Heatmap maps every strike against every expiry and labels concentration, churn, call wall, put wall and pin-zone context. The separate Premium Heatmap and Open Interest view compares intraday premium with cleared positioning by strike.