Is the gamma wall the same as the call wall?

On Owl Mastery, yes. The gamma wall is the strike with the largest gamma times open interest, with puts counted as negative. Call resistance (call wall) is the strike with the largest net gamma exposure, calculated as that same value times 100 times the stock price. Since every strike uses the same positive stock price, both calculations select the same strike. The levels table shows both names in one row. Other providers may compute a gamma wall differently.

Is the gamma wall support or resistance?

Owl Mastery's gamma wall is call resistance, so it is where a rally may stall. It marks where net gamma is most concentrated. Price can trade through it, and news or broad market flows can outweigh hedging at any strike.

Why does the gamma wall move?

Owl Mastery recomputes it once a day, after each US close, from the options open interest for that day. It moves when positions open, close or expire, and when gamma shifts as price, time to expiry and implied volatility change.

Where can I see the gamma wall for a stock?

Each Owl Mastery ticker page with options data lists the gamma wall in the same row as call resistance, with its distance from the last close, next to the HVL, put support and the one-day range.

What is the gamma wall?

On Owl Mastery, the gamma wall and call resistance are the same strike by construction. The gamma wall marks where net options gamma is most concentrated. It is the strike with the largest gamma times open interest, with puts counted as negative, computed over every strike after each US close. Owl Mastery shows both names in one row of the levels table. Other providers may compute a gamma wall differently.

SPX levels for the Nov 10, 2026 close
Level	Price	From close
Call resistance (call wall) and gamma wall	8,100.00	+7.70%
HVL	7,660.00	+1.85%
1-day range high	7,592.67	+0.95%
Close	7,520.93
Put support (put wall)	7,500.00	-0.28%
1-day range low	7,449.19	-0.95%

How Owl Mastery computes the gamma wall

Gamma is how much an option's delta changes when the underlying moves by $1. Open interest is how many contracts are still open at a strike. Multiplying the two shows how much the delta of all the open contracts at a strike changes for a $1 move. That is the amount of hedging those contracts may call for.

Owl Mastery's gamma wall is the strike with the largest gamma times open interest, with puts counted as negative. Each strike's figure adds the gamma times open interest of its calls and subtracts that of its puts. Owl Mastery looks at every strike and every expiry, once a day after the US close. The methodology page lists the formula next to the other levels.

A worked example

The numbers below are illustrative, not live data. Assume calls and puts at a strike share the same gamma. Each option contract covers 100 shares, so gamma times open interest times 100 is the change in hedge, in shares, for a $1 move.

Strike	Call open interest	Put open interest	Gamma per share	Gamma × open interest, puts negative
105	2,000	6,000	0.05	-200
110	5,000	1,000	0.03	+120
115	8,000	500	0.01	+75

The gamma wall here is 110, and so is call resistance. The 105 strike has the largest gross figure, 400 before puts are subtracted, but its puts outweigh its calls, so it nets to -200 and is the most negative strike, which makes it put support. The 115 strike has the most call open interest, but its options carry little gamma. Options with strikes near the price carry the most gamma, and more so as expiry approaches, which is why the strike with the most contracts is not always the gamma wall.

Gamma wall and call resistance

Owl Mastery's gamma wall and call resistance, also called the call wall, are the same strike. Call resistance ranks strikes by net gamma exposure. That is the strike's gamma times open interest, with puts negative, multiplied by 100 and by the stock price. The stock price is one positive number, so it scales every strike equally and the ranking does not change. The levels table shows both names in one row because both are in common use.

Level	How Owl Mastery picks the strike	Unit
Gamma wall	The largest gamma times open interest, puts counted as negative	Gamma times contracts
Call resistance	The largest net exposure, calls positive and puts negative	Dollars of delta-hedging exposure per $1 move
Put support	The most negative net exposure	Dollars of delta-hedging exposure per $1 move

Other providers may use "gamma wall" for a different measure, such as the strike with the most gamma regardless of sign, or for another level. Check the definition before you compare levels across sites.

The gamma wall for the nearest expiry

Owl Mastery computes the gamma wall twice. The level on ticker pages uses every expiry. With a free account, the dashboard also shows call resistance, the gamma wall, the HVL and put support for the nearest expiry alone. For each scope the gamma wall equals call resistance, so the nearest expiry's gamma wall is its call resistance.

The nearest-expiry level and the all-expiry level can differ. Options near expiry carry the most gamma when their strike is near the price, so the nearest expiry can have its own concentration close to where the stock trades. The all-expiry level can sit further away, where longer-dated open interest has built up over weeks. Comparing the two shows whether the largest concentration is tied to one expiration or spread across many. Once the nearest expiry passes, the nearest-expiry levels switch to the next expiry.

How to read the gamma wall

The largest net exposure. The gamma wall is the single strike with the largest net gamma times open interest. Because it is also call resistance, a rally may stall there.
Distance from the close. Each ticker page shows how far the gamma wall sits from the close, in percent. Compare it with the one-day range to see whether a typical day could reach it.
One level, two names. The gamma wall and call resistance are the same strike, so reading one reads the other.
The regime. Whether hedging at the wall damps or adds to moves depends on the sign of the dealer position, which the positive vs negative gamma article explains.

The SPX page lists the gamma wall in the same row as call resistance, with the other levels for the latest close.

Limits of the gamma wall

Size, not direction. Gamma times open interest measures how much hedging a strike may call for. Whether that hedging leans against a move or adds to it depends on who is long and who is short, which open interest does not show.
Expiries roll off. Gamma tied to a near-term expiration disappears once it passes, so the wall can jump to another strike.
Once a day. The gamma wall comes from the options open interest for that day and stays fixed through the next session, while gamma shifts with price, time to expiry and implied volatility.
A tendency, not a forecast. Hedging competes with every other buyer and seller. Price can move through the gamma wall without pausing.