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Options positioning · call wall, put wall, gamma flip · long or short

GEX Levels

Options dealers hedge, and their hedging leaves fingerprints at a few prices every morning. The walls tell you where price is likely to stall. The gamma flip tells you how it will move: fade the walls above the flip, follow the break below it.

3levels that matter
2regimes, two playbooks
9:30snapshot, fresh every day

6 / 6

Watch one session against the levels

1

Measure gamma exposure at every strike

  • For each strike: gamma × open interest × 100 × spot² × 1%. Calls count positive, puts negative. The result is the dollars dealers have to buy or sell for each 1% move.
  • Use expirations out to 30 days and price them at the 9:30 open. Including every expiration lets far-dated round strikes take over the picture.

Dealers are mostly short the options the public buys, and they hedge to stay neutral. Where that hedging is concentrated, their buying and selling becomes the market's.

2

The call wall: the biggest call exposure above price

  • Of the strikes above the current price, the one with the largest call gamma is the call wall. A second-largest is the backup (CW2).
  • Above the flip it acts as resistance: as price climbs into it, dealer hedging leans against the move.

It's a ceiling made of hedging flows, not of past prices. It moves when positioning moves, which is why it's recalculated every morning.

3

The put wall: the biggest put exposure below price

  • Of the strikes below the current price, the one with the largest put gamma is the put wall, with a backup (PW2).
  • It acts as support. Same-day (0DTE) walls are tracked separately: they matter for SPY and QQQ every day and for most names on Fridays.

A put wall that holds tends to hold hard, because the hedging there pushes back against the drop. A put wall that breaks tends to break fast.

4

The gamma flip sets the regime

  • Re-price the whole chain across a range of prices and find where total gamma crosses zero. That price is the flip.
  • Above it, dealers are long gamma: they sell rips and buy dips, so moves get damped. Below it, they're short gamma and hedge with the move, so moves stretch.

The flip doesn't tell you direction. It tells you which playbook the market is running today, and that decides how to treat every other level.

5

Fade the walls above the flip, follow the break below it

  • Above the flip: short the call wall rejection (tag the zone, close red back under) and buy the put wall hold (tag the zone, close green back over).
  • Below the flip: short the failed flip retest from below; take wall breaks seriously. A close back over the flip is the reclaim, and the regime turns again.

The same touch of the same wall is a different trade depending on which side of the flip you're on. Most bad GEX trades are fades in negative gamma.

6

Grade the levels before trusting them

  • Confidence comes from total net GEX: HIGH at $500M or more, GOOD at $100M, MED at $25M, LOW below that. Any ticker whose biggest wall is under $5M is LOW too.
  • Each wall also carries its own size in dollars per 1% move. A $2.4B put wall and a $49M put wall are not the same level.

On thin names the walls are a few contracts deep, and nothing about them forces anyone to hedge. Faded lines on the chart mean LOW confidence: treat them as reference only.

Where the levels come from

Net gamma exposure by strike. The tallest call bar above price is the call wall; the tallest put bar below price is the put wall; the flip sits where the total crosses zero.

Net GEX by strike · $B per 1% move · illustrative ◀ puts (negative) calls (positive) ▶ −1.1 764 −2.4 765 −1.2 766 −1.5 767 −0.9 768 −0.6 769 +0.1 770 +0.5 771 +0.7 772 +0.9 773 +1.0 774 +2.1 775 +0.8 776 +0.6 777 CALL WALL 775 GAMMA FLIP 770 PUT WALL 765 price 771.40

Same levels, two playbooks

Which side of the flip price is on decides whether the walls are levels to fade or levels to break.

Above the flip · positive gamma Dealers sell rips and buy dips. Walls hold more often: fade them. CALL WALL FLIP PUT WALL CW rejection PW hold Below the flip · negative gamma Dealers hedge with the move. Moves stretch: follow them. CALL WALL FLIP PUT WALL loses flip retest fails PW break

When to pull the levels

The levels are a morning snapshot. They're good for that session, and they go stale when positioning shifts.

Morning · 8:45–9:15 ET

The main run, before the open. Open interest is from the prior close; gamma is priced at the 9:30 open.

Midday rerun

For 0DTE names (SPY, QQQ, and everything on Fridays), or after a big move. Same-day options shift the walls by the hour.

Not tomorrow

Never carry today's walls into tomorrow. New open interest, new expirations, new levels.

The four filters

The levels are only as good as the positioning behind them. These keep you from trading a line that isn't really there.

1  Stale levels

Yesterday's walls, or this morning's walls after a big move or heavy 0DTE flow. Positioning has changed and the line hasn't.

Kills: trading a wall that has already moved.

2  LOW confidence

Total net GEX under $25M, or a biggest wall under $5M. There isn't enough hedging there to push price around.

Kills: treating a few contracts as a wall.

3  Fading in negative gamma

Below the flip, dealers add to the move. A wall touch here is far more likely to give way than in positive gamma.

Kills: catching a falling knife at a put wall.

4  Another symbol's strikes

SPX levels on SPY, or NDX levels on QQQ, without converting them. SPX 7700 is not SPY 770.00 exactly; the ratio drifts.

Kills: a level that's off by a few dollars and misses every touch.

Stop past the level, target the next one

The levels hand you both ends of the trade: the stop goes just past the level you're trading, the target is the next level in the way.

Risk budget for the trade$500.00
Entry — flip retest fails, short769.80
Stop — over the flip plus the zone770.40
Risk per share$0.60
Target — the put wall767.00
Position size · reward833 shares · 4.7R

The mistake this prevents

A wall is a zone, not a tick. Put the stop exactly on the level and every tag of the zone takes you out right before the turn.

Zone = 0.25 × ATR(14). Stop beyond the level by at least that.

And the target is the next level, not a fixed R. If the next level is too close to pay for the risk, there's no trade.

One morning, three tickers

Levels from the morning pipeline. These are the calculated levels, not trade results.

  SPXindex · checked against a reference chart SPYOct 5 MUsingle stock
Call wall7700—1100 · $105M
Gamma flip7685770989.87
Put wall7650767 · $2.4B1000 · $49M
Second walls / 0DTE0DTE call wall 7700—CW2 1150
Net GEX · confidenceHIGH−$5.2B · strong negative gammaGOOD
The read The calculated walls matched the reference chart's 7700 / 7650 / 7685 once expirations were capped at 30 days. Stuck just under its 770 flip in strong negative gamma, with the 767 put wall as the line to watch: a break there runs. A $105M call wall over a $49M put wall: GOOD, but a fraction of SPY's size. Weight the levels accordingly.

Example: one session against the levels

An example session run through the indicator's own rules, with a call wall at 775, a gamma flip at 770 and a put wall at 765. Above the flip price grinds into the call wall and is rejected; it then closes under the flip, a retest of the flip from below fails, and the slide stops at the put wall, where a green bar closes back over it. Each bar is tinted green above the flip and red below it. The bars and levels are made up to show the setup clearly. They aren't a real ticker.

Loading chart…

2-minute

Indicator for this setup

Add this to a TradingView chart and paste the morning levels into its settings. It draws and alerts on the levels — it does not place trades.

The walls tell you where. The flip tells you how.

A level without its regime is half the information. Check which side of the flip you're on before you decide whether a wall is something to lean on or something about to give way.

  • Pull the levels every morning, and again midday for 0DTE names or after a big move.
  • Above the flip, fade the walls. Below it, respect the breaks and short failed flip retests.
  • Grade before you trade: LOW confidence or a thin wall is a reference line, not a level.

Levels calculated from delayed options chains each morning (gamma × open interest × 100 × spot² × 1%, expirations out to 30 days, priced at the 9:30 open); the SPX method was checked against a reference chart's published levels. Chart above is an illustration of the mechanics; the table shows calculated levels, not trades.