What is a Put Wall? The Put Wall is the strike with the largest net negative Gamma in the underlying stock/ETF. Why does Put Wall matter? It can act as support, indicating where buyers may enter the market. How to use a Put Wall The Put Wall level lets you know where support lies for a stock, and a change in the price of the Put Wall can help you can manage your risk while either long or short. A shift higher is often a bullish signal while a shift lower in the Put Wall is a bearish signal. Related articles What is Put Wall Support? What are Zero Gamma Levels? What is a Call Wall? What is Call Wall Strike? What is Key Gamma Strike?