Put Wall¶
A put wall is the strike price carrying the largest concentration of put option open interest for a given underlying security. It marks the level where dealers, assumed to be net short those puts, hold their greatest hedging obligation on the downside. Traders read it as a soft floor where a decline often stalls, at least into the expiration holding the bulk of the contracts.
HOW IT WORKS¶
As the underlying falls toward the put wall, dealers short the underlying to hedge their exposure, which accelerates the move down. When price reaches the wall, gamma peaks, the hedge flow stabilizes, and concentrated positioning absorbs further selling. A bounce frequently follows because any uptick forces dealers to cover short hedges. The wall is identified by ranking strikes by put open interest—the highest is the put wall—or by weighting strikes by negative gamma exposure to isolate the economically significant level. The wall is not a guaranteed floor: in a genuine liquidation, price can slice through it and dealer hedging underneath turns into additional downside fuel. Open interest also does not confirm trade direction, so the dealer-short assumption is an approximation that can break down for strikes dominated by structured product issuance or spread legs.
IN TAPEBOARD¶
Use the live scanner to identify tickers building heavy put-side open interest and to monitor shifts in the put wall strike across expirations. The distance between the current spot price and the put wall quantifies how much downside the options market has positioned for, providing a read on crash protection demand. Traders use the put wall level to place stop losses below key support, to select long strikes for debit spreads, and to size downside risk in a position.