Call Wall
A call wall is the strike above the current price with the largest concentration of call open interest. Because dealers are often short those calls and long gamma there, their hedging can slow advances into the strike, so it frequently behaves as a near-term ceiling.
When a strike accumulates heavy call open interest, dealers holding the other side tend to be long gamma at and below it. As price rises toward the wall, their hedging leans against the move, which can cap momentum - the market often stalls or pins just beneath a strong call wall.
A call wall that holds acts as resistance; a call wall that migrates upward with price is a different signal, suggesting the market is being bought systematically rather than capped. Watching whether the wall defends or moves is often more informative than the level itself.
The wall is identified from an estimate of open-interest concentration and dealer positioning, so it is a structural tendency, not a guaranteed level. Prices can and do push through walls, especially when positioning shifts.
Frequently asked
Is a call wall guaranteed resistance?
No. It is a strike where dealer hedging can slow an advance, which often makes it act as a ceiling - but it is a tendency estimated from positioning, and price can break through.
What does it mean when the call wall moves up with price?
It suggests new call interest is being written above spot as fast as the old is absorbed - a sign the market is being bought systematically rather than capped at a fixed level.
Related terms
This term is part of a bigger picture: Gamma Exposure, Explained — the complete guide →