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Definition · updated 2026-10-21
Call wall
The call wall is the strike carrying the largest positive gamma exposure in an option chain, usually the strike with the most call open interest above spot. Dealers hedging those calls sell shares as price rises toward it, so rallies tend to slow or stall there.
See it live: today's GEX levels by ticker.
How to use it
Treat the call wall as a target and a resistance with a mechanical cause rather than a line on a chart. A break above it with rising call volume means dealers are chasing, which can accelerate the move; a rejection with fading volume is the base case.
The wall moves as open interest moves, so re-read it each session and after large prints.
Frequently asked questions
- What happens when price breaks the call wall?
- Dealers who were selling into the rally are now short more delta and must buy, so a clean break can extend. Often the wall rolls up to the next heavy strike.
- Is the call wall always above spot?
- Usually, but after a sharp rally the heaviest call strike can sit below spot, which signals the chain has not caught up and the level is stale.