# How to Trade GEX Levels: Setups, Triggers and Exits ## SPX DAILY GEX LEVELS Computed from daily-settled Cboe open interest. Dealer positioning is modeled, not observed. Nothing here is advice. Open interest settlement: 2026-09-24. - **Call wall, settled 2026-09-24. Computed from daily-settled Cboe open interest.** $7,800 - **Put wall, settled 2026-09-24. Computed from daily-settled Cboe open interest.** $7,500 - **Zero-gamma flip, settled 2026-09-24. Computed from daily-settled Cboe open interest.** $7,670 - **Vol trigger, settled 2026-09-24. Computed from daily-settled Cboe open interest.** $7,709 - **Net dealer gamma, settled 2026-09-24. Computed from daily-settled Cboe open interest.** $15.06B - **Largest absolute gamma strike, settled 2026-09-24. Computed from daily-settled Cboe open interest.** $8,000 Source: SquawkFlow URL: https://squawkflow.com/learn/how-to-trade-gex-levels Category: Options Strategy Published: 2026-09-25 Type: Explainer > How traders use GEX levels in practice: the base-rate problem, the regime read, setups at the walls, what invalidates each, and when to stand aside. --- ## What a GEX level can and cannot tell you Trading GEX levels means trading around the prices where options dealers are expected to hedge hardest. The premise is that dealers hedge mechanically, so knowing where their gamma sits and which way it points tells you where forced buying or selling should appear. If gamma exposure itself is new to you, start with [what gamma exposure is](/learn/what-is-gamma-exposure-gex). This page assumes the vocabulary and covers the process. Three facts shape everything that follows. **The levels are a model, not an observation.** Nobody publishes dealer inventory. Every GEX level is built from public open interest plus an assumption about who holds it. The usual assumption is that customers sell calls (covered-call overwriting) and buy puts (protection), which leaves dealers long calls and short puts. Where that assumption is wrong at a strike, the level at that strike is wrong too. **The map is fixed for the session.** The Options Industry Council notes that OCC "can only report new open interest after clearing and pairing opening and closing positions at the end of the day" ([OIC FAQ](https://www.optionseducation.org/referencelibrary/faq/general-information)). A GEX map built from open interest reflects the prior close and does not update while the market trades, however often the page refreshes. **Much of the day's gamma is not on the map.** Cboe reported that same-day (0DTE) contracts made up 66.2% of total SPX options volume in July 2026 ([Cboe July 2026 volume report](https://ir.cboe.com/news/news-details/2026/Cboe-Global-Markets-Reports-Trading-Volume-for-July-2026/default.aspx)). Positions opened and closed inside the session never reach an end-of-day open interest file, so the morning levels describe the book dealers carried in overnight and nothing that builds after the open. GEX levels are therefore zones where a reaction is plausible and a response can be planned, not prices where the market must turn. ## The base-rate problem, before any setup Guides to trading GEX levels describe setups. None of the top-ranking ones publishes how often those setups work, and a headline hold rate that does not say how it was measured deserves suspicion. The most common distortion is distance. A wall far from spot "holds" on most days simply because price never gets there, so a hold rate taken across all sessions mostly measures how far away walls usually sit. The number that matters is **touch-conditioned**: of the sessions where price actually reached the level, how often did it reject? SquawkFlow withdrew its own published hold rate in August 2026 for exactly this reason. The only base rate that fits your levels, your provider and your definitions is one you collect. A minimal journal: - Date, level type, and the level's distance from spot at the open - Regime at the time (above, below or on the flip) - Whether price touched the level, and what you defined as a touch - The outcome: rejected, accepted beyond, or chopped through - Any scheduled event or expiration in the window Everything below is a hypothesis that this journal eventually confirms or kills. ## Read the regime, then the distance Most GEX traders reduce the board to a few written answers before the open. **Which side of the flip is spot on?** Above the [zero-gamma flip](/learn/gex-flip-price-explained), dealers are net long gamma and their hedging leans against moves. Below it, they are net short gamma and their hedging leans with moves. **Is spot sitting on the flip?** That is the least stable state on the board. Small moves change the sign of net gamma, and different estimators disagree near zero, so the same tape can be called positive by one model and negative by another. The common response is to wait and see which side price accepts, then treat the session as that regime. The failure mode is a false flip, where price pokes through and returns within minutes, which is why a rule for "held long enough to count" belongs in the plan, not in the moment. **How far away is each wall?** Record the call wall and put wall as a percentage from spot. A nearby wall is a potential trade location; a distant one is context. **What is on the calendar?** CPI, FOMC, index rebalances and large expirations change how much weight the map deserves. [SPX gamma levels explained](/learn/spx-gamma-levels) covers why two providers' levels differ and what to check about a snapshot's inputs. ## Break and extend in negative gamma Below the flip, dealers hedge in the direction of the move: selling into declines, buying into rallies. This is the regime with the strongest academic support. Baltussen, Da, Lammers and Martens find that hedging short gamma "requires trading in the direction of price movements" and link it to intraday momentum across more than 60 futures markets ([Journal of Financial Economics, 2021](https://www.sciencedirect.com/science/article/abs/pii/S0304405X21001598)). Barbon and Buraschi report that intraday momentum and reversal are explained by negative and positive gamma imbalance interacting with illiquidity, an effect "stronger for the least liquid underlying securities" ([Gamma Fragility, SSRN](https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3725454)). That is a comparison across securities, not a finding about time of day. **How it is typically traded.** Traders who run this setup wait for a level to break and fail its retest, rather than acting on the first print through it. **What invalidates it.** A reclaim of the broken level, or a return above the flip, which removes the regime the idea depended on. **The common error.** Fading a negative-gamma move because it looks stretched. That is a positive-gamma instinct applied in the wrong regime. ## Selling pressure at the call wall Under the standard convention, dealers are net long the calls stacked at the [call wall](/glossary/call-wall). As price rallies toward that strike, their long-call delta rises and they sell the underlying to stay hedged, with the selling growing fastest near the strike. That is the mechanical reason rallies into the wall tend to decelerate when net gamma is positive and no catalyst is scheduled. **How it is typically traded.** On evidence of absorption, not on the touch. A touch only says price arrived. Traders look for a rejection candle, a failed second push, or volume drying up on the approach. **What invalidates it.** Acceptance beyond the wall, defined in advance (for example, several consecutive closes beyond it on a fixed bar length). Acceptance means the hedging flow lost. **What the gamma logic implies about targets.** Less than most guides suggest. Dealer selling explains why a rally slows near the wall. It says nothing about how far price then travels, so traders who use this setup typically look for rotation back into the range rather than a full move to the opposite wall. ## The put wall is a short-gamma level Many guides mirror the call-wall fade at the put wall. The convention says that is a weaker trade. If customers buy puts, dealers are short them, and short puts are short gamma: as price falls toward the strike, hedging sells into the decline rather than absorbing it. Support at the put wall therefore leans on other forces (put holders monetising, the broader regime staying positive) rather than on direct dealer hedging. That makes the put wall more plausible as support while the overall regime is positive, and leaves little mechanical support behind it when the regime is not. A put-wall break with net gamma already negative is the break-and-extend setup above, not a fade. ## The expiration pin Into an expiration, large open interest at a nearby strike can pull price toward it as dealers rebalance hedges. The best-known evidence is Ni, Pearson and Poteshman: "on expiration dates the closing prices of stocks with listed options cluster at option strike prices," with returns altered by at least 16.5 basis points on average ([Journal of Financial Economics, 2005](https://www.sciencedirect.com/science/article/abs/pii/S0304405X05000577)). Two cautions. The evidence is on single stocks, and the authors attribute part of it to manipulation by proprietary traders, not hedging alone, so it is suggestive for SPX rather than proof. And a pin needs dealers long gamma at the strike. In a negative-gamma regime, hedging near a large strike can push price away from it rather than toward it. If you trade same-day options around this read, the [0DTE SPX strategy guide](/learn/0dte-spx-strategy) covers which structures suit each side of the flip. ## When to stand aside Much of the skill is knowing when the map has little to say. - **Event windows.** Around CPI and FOMC, macro repricing routinely overwhelms hedging demand. - **After a large intraday move.** Once price has travelled far from where the levels were computed, the morning map describes a book that no longer exists. - **The session after a big expiration.** Walls built on contracts that just expired are gone, even if last week's chart still shows them. - **Model disagreement.** If independent sources put the flip far apart, positioning near it is genuinely ambiguous. Ni, Pearson, Poteshman and White find that market-maker "hedge rebalancing affects stock return volatility and the probability of large stock price moves" ([Review of Financial Studies, 2021](https://academic.oup.com/rfs/article-abstract/34/4/1952/5873587)). That is a statement about tendencies across many days, not about any single level on any single afternoon, which is why the journal matters more than any one setup. ## Where to get the levels SquawkFlow's [free SPX GEX page](/gex) publishes the call wall, put wall, vol trigger and zero-gamma flip, computed once each morning from the prior session's settlement open interest and fixed for the day, with spot refreshed intraday. When spot sits on the flip it says so, rather than forcing a positive or negative label. No signup is required. *Educational content, not financial advice. See our [risk disclosure](/risk-disclosure).* --- ## Citation Source: SquawkFlow, https://squawkflow.com/learn/how-to-trade-gex-levels Retrieved: 2026-09-25 23:20 ET Attribution: cite the page URL rather than a copied number. Levels are recomputed every session, so a number without its date is wrong within a day. SquawkFlow publishes market-structure data and education. Nothing here is investment advice, a price target or a recommendation, and we have no order execution.