Call wall and put wall: what they are and how to read them
The short answerThe call wall is the strike with the most call open interest within reach of the price; the put wall is the strike with the most put open interest. Because so much hedging sits at those strikes, prices often slow near them — the call wall acting like resistance, the put wall like support. They are zones of pressure, not guarantees.
How the walls are found
Add up the open interest of every call at each strike, across the expirations, and pick the biggest one near the price: that is the call wall. Do the same for puts: that is the put wall. “Near” matters — a huge block of puts 30% below the price is usually a long-dated hedge, not a level the price will meet this month. On this site such far blocks are mentioned separately and not drawn as walls.
Why they act like levels
- Dealers hedge the options they hold. Around a strike with very large open interest, that hedging tends to sell strength under a call wall and buy weakness above a put wall — especially when dealers are long gamma.
- Into an expiration, heavy strikes can “pin” the price (see max pain).
- Many traders watch the same strikes, which adds to the effect.
When walls break
Walls give way when the market has a reason to move — news, earnings, a big macro release — and more easily when dealers are short gamma, because then their hedging pushes with the move. A wall that moves is information too: a call wall that rolls up to a higher strike means new call positions are being built above; a put wall that drops means protection is being bought lower. The site’s Today page lists walls that gave way each night.
Live example: SPY and QQQ today
From the close of Fri, Nov 13, 2026 — this box is rebuilt after every trading day.
On Nov 13, 2026 SPY closed at 754.21. Its call wall is 800 (6.1% above the close, unchanged for 31 sessions) and its put wall is 700 (7.2% below the close, unchanged for 36 sessions). Further down, 500 holds more put open interest than any strike near the price — a long-dated hedge, too far away to act as a level.
QQQ: call wall 700, put wall 650, close 679.89.
The walls for every stock and ETF: SPY · all stocks.
Questions and answers
Is the call wall resistance?
Often it behaves like resistance, because dealer hedging tends to sell strength below a large call strike. It is a zone of pressure, not a ceiling, and it breaks when the market has a reason to move.
Do call and put walls change every day?
They can. Walls are recalculated each night from open interest; on SPY they often stay at the same round strike for weeks and then jump when positions roll.
What is the difference between a put wall and support?
Support is read from past prices; the put wall is read from today’s option positions. When both point to the same area, traders give it more weight.
All 10 lessons: Learn · every term in one long page: the full guide · the numbers for any ticker: ETFs, stocks. For education only — not investment advice.