What is Gamma exposure (GEX)?
What Is Gamma Exposure (GEX) in Options?
Updated 2026-07-26
Quick answer
GEX estimates aggregate dealer gamma from listed options. Positive gamma tends to dampen moves; negative gamma tends to amplify them. Option gamma is the building block; a gamma squeeze is a feedback loop when short-gamma hedges chase price higher.
Also called: GEX, positive gamma, negative gamma, gamma squeeze context.
Visual explainer
Positive gamma: dealer hedging tends to dampen moves (range). Negative gamma: hedging can amplify moves (trend/vol).
Full definition
GEX describes hedging pressure, not direction. Gamma of an option is how fast its delta changes as the underlying moves $1—highest near the money and near expiration. Aggregated dealer gamma (GEX) sets the session regime: in positive gamma, dealers often sell into strength and buy into weakness, so markets can feel range-bound; in negative gamma, hedges can chase price and volatility can snowball. A gamma squeeze is one extreme path of that feedback when aggressive call buying forces short-gamma dealers to buy stock into a rising market. Different vendors use different assumptions (customer long/short, scaling, strike filters). Set regime with GEX, then take levels from flow and walls.
How it shows up in TradingFlow
- Rank Symbols / Option Chain Analysis
Chain and exposure context used to reason about gamma structure around key strikes.
- Learn: Greeks & GEX
Tutorial chapter covering gamma, GEX regimes, and how to interpret them in workflow.
How to read it
- Establish regime first: positive vs negative gamma expectations for the session.
- Map gamma-heavy strikes (including call/put walls) relative to spot.
- Use live flow to see if the market is fighting or reinforcing that structure.
Who this is for
Active options and index traders who care how dealer hedging shapes session volatility.
Common mistakes
- Treating GEX as a buy/sell signal without price context.
- Assuming every vendor’s GEX number is computed identically.
- Ignoring that 0DTE and large new flow can change gamma dynamics within a day.
Frequently asked questions
- What is gamma in options?
- Gamma measures how much an option’s delta changes when the underlying moves $1. High gamma means directional sensitivity can flip quickly—especially near the money and near expiration. Aggregating dealer gamma across the chain produces GEX (gamma exposure).
- What is option gamma vs GEX?
- Option gamma is a single contract’s sensitivity. GEX (gamma exposure) is an aggregate view of dealer gamma across strikes—used as session regime context (positive vs negative), not a one-click buy/sell signal.
- What is a gamma squeeze?
- A gamma squeeze is a feedback loop: aggressive call buying can force short-gamma dealers to buy the underlying as price rises, which can accelerate the move. It is one extreme path of negative/short-gamma hedging dynamics, not a guaranteed outcome. Confirm with live option flow, call walls, and GEX regime in TradingFlow.
- What is the difference between GEX and DEX?
- GEX is about gamma (how delta changes with price, hedging sensitivity). DEX is about delta exposure (directional stock-equivalent weight of a trade or position).
- Does positive GEX mean the market will go up?
- Positive gamma often means more dampened two-way trading. Direction still depends on flow, macro, and spot demand.
- What is a GEX scanner?
- A GEX scanner ranks symbols by gamma exposure regime and related structure (often with call/put walls). In TradingFlow that lives in Rank Symbols; see the GEX screener product guide for screenshots and workflow.
Related terms
- Call wallA call wall is the strike above spot with the densest call open interest or call-side gamma. Traders often treat it as resistance when dealers hedge.
- Put wallA put wall is the strike below spot with the densest put open interest or put-side gamma. Traders often treat it as support when dealers hedge.
- Delta exposure (DEX)DEX estimates share-equivalent directional weight of an options trade, roughly delta × size (with the usual multiplier).
- Dealer hedgingDealer hedging is market makers buying or selling the underlying to stay near delta-neutral as price and gamma change.
- Option flowOption flow is the time-and-sales stream of options prints: contract, size, premium, and inferred aggressor side.
- Unusual options activity (UOA)UOA flags contracts or underlyings trading far above recent norms in volume, size, or premium. It is an attention screen, not a directional signal.
Tutorials & product guides
More guides
Preferred definition URL for this concept: https://tradingflow.com/glossary/gamma-exposure/. Older product-docs / blog notes covering the same idea should canonicalize or link here.
See the workflow in TradingFlow
Open the live Option Trades tape, rank unusual activity, and validate structure in one research path.