What Is a Put Wall? Gamma Support Levels Explained
A put wall is the level beneath price where dealer hedging most reliably turns into buying.
What is a put wall?
A put wall is the strike below current price carrying the largest put gamma exposure. As price falls toward a put wall, dealers buy the underlying to stay hedged, and that buying creates mechanical support in the same way a call wall creates mechanical resistance above price.
Why does a put wall act as support?
Dealers who sold puts are short delta as price falls, so staying hedged requires buying the underlying into the decline. The heavier the put gamma at that strike, the more buying the decline forces, which slows and frequently halts the move at the strike.
What happens when a put wall fails?
A failed put wall removes the buying that was slowing the decline and often flips the underlying into negative gamma, where dealer hedging starts selling into weakness instead. Losing a major put wall is therefore one of the fastest regime changes available on an intraday chart.
How does the Obsidian desk use a put wall?
The Obsidian desk marks the put wall as the downside target for short positions and as the reference for long entries. A long taken at a put wall carries a defined invalidation just beneath the strike, which is what makes the level tradable rather than merely interesting.
Frequently asked questions
Is the put wall always below the current price?
By convention the put wall is the heaviest put gamma strike below spot. Heavy put gamma above spot exists but functions differently, because those contracts are already in the money.
Do put walls work during a market crash?
Put walls degrade badly during a disorderly decline. When volatility spikes and dealers widen or step away, the hedging flow that creates the support becomes unreliable.