Free COST GEX - Costco Gamma Exposure
Free COST GEX maps Costco gamma exposure by strike. Select expirations around earnings, membership updates or retail demand, then generate the chart to compare net GEX, call wall, put wall and gamma flip.
How to use the COST GEX tool
Search COST
COST is already entered. Keep it or enter another ticker, then select Search.
Select expirations
Choose one or more expiration dates to include.
Generate GEX
Select Generate GEX to view the chart and key levels.
Run up to 3 free GEX calculations per day. Need more?
Continue for free in the GEX SandboxGEX Workspace
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What is Gamma Exposure (GEX)?
Gamma Exposure represents the sensitivity of an option's delta to changes in the underlying price. Market makers hedge their gamma exposure, creating support/resistance at high GEX strikes.
Key Levels:
- Call Wall: Strike with highest positive GEX (resistance)
- Put Wall: Strike with the largest put GEX, shown as the deepest negative bar (support)
- Gamma Flip: Where total GEX changes from negative to positive
Positive GEX: Market makers sell into rallies, buy into dips (stabilizing).
Negative GEX: Market makers buy into rallies, sell into dips (amplifying moves).
Select a ticker and expiration date, then click Generate GEX to see the analysis
Build your COST GEX workspace
Add COST Heatmap, Max Pain and other GEX views to a custom multi-ticker workspace.
Open GEX WorkspaceWant to compare strikes across expirations? View the COST GEX heatmap.
Understanding COST gamma exposure
Costco carries one of the highest nominal share prices in consumer retail, which pushes strike intervals wide and prices casual speculation out of its options chain. What remains is institutional: hedges on large positions, systematic overwriting, and earnings positioning. COST gamma exposure is therefore concentrated into relatively few strikes, and those strikes hold - the call wall and put wall on this name are among the more stable levels in the consumer sector.
Costco also reports monthly sales figures, which gives its gamma a rhythm most retailers lack: positioning refreshes twelve times a year rather than four. The stock's persistent premium valuation means the options market is unusually attentive to any deceleration in comparable sales, and the put wall firms up quickly when one appears. In positive gamma, which is most of the time, COST pins into monthly expiration with the reliability you would expect from a chain this institutionally held.
New to the concept? Start with our guides to gamma in options and the options Greeks.
COST GEX methodology and limitations
QuantWheel calculates COST GEX from the selected expirations, available options data and the formula displayed in the calculator. The result summarizes modeled gamma exposure by strike.
GEX is a model output, not observed dealer inventory or a price forecast. Open interest does not identify who owns an option, and the displayed call wall, put wall and gamma flip can change when the inputs or selected expirations change.
COST GEX FAQ
What is COST GEX?
COST GEX estimates gamma exposure across listed COST options using option gamma and open interest. It helps you compare how modeled exposure is distributed by strike and expiration. COST GEX does not reveal actual dealer positions or predict where COST will trade.
How do I read the COST call wall and put wall?
QuantWheel labels the COST call wall as the strike with the largest positive modeled GEX and the COST put wall as the strike with the largest negative modeled GEX in your selected data. Compare both with the COST price and expiration choices. They are reference levels, not guaranteed support or resistance.
What is the COST gamma flip?
The COST gamma flip is the price where modeled net gamma crosses zero for the selected COST options data. Compare it with the current price and the shape of the strike chart. The COST gamma flip is a model output, not a trading signal.
Which expirations should I use for COST GEX?
Start with the nearest COST expiration to study short-dated positioning, then add later expirations to compare a broader part of the options chain. Each selection changes which COST contracts are included, so compare one expiration with a combined view before drawing conclusions.
Is the COST GEX calculator free?
Yes. You can run up to three free COST GEX calculations per day on the public tool. After using those calculations, continue for free in the GEX Sandbox. Check the current QuantWheel pricing page for plan access details.