Using Historical GEX Filters to Review Past Gamma Levels

Historical GEX filters are a premium feature that let you select past option expiration dates and see how gamma exposure was distributed at the time. Instead of only analyzing the current chain, you can replay how dealer positioning shaped price action in previous cycles.

What Historical Filters Do

When you choose one or more historical expirations in the screener (or on the analysis page), the GEX calculations are rebuilt from the option chain as it existed for those dates, and price context is anchored to the same period.

• Backtest strategies using historical gamma exposure data
• Understand how GEX levels influenced past price action
• Identify recurring patterns around expiration dates

A Simple Backtesting Workflow

1. Pick a stock that had significant gamma walls in a prior cycle.
2. Select the historical expiration(s) you want to study.
3. Compare the significant GEX levels against where price actually traded into and through expiration.
4. Note whether positive-gamma levels acted as support and negative-gamma levels as resistance.

Things to Keep in Mind

• Historical GEX shows tendencies, not guarantees — confirm with price and volume.
• Pinning effects are strongest near monthly OPEX with large open interest.
• Use several cycles before drawing conclusions about a recurring pattern.

Historical GEX filters require an active subscription. Upgrade to premium to unlock them, or head to the screener to start exploring.