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Anchor Points, Defense Lines, and GEX Flip Points

A deep dive on the three key levels that drive price behavior in the GEX heatmap.

Anchor Point​

What It Is​

The Anchor Point is the brightest tile on the heatmap - the strike with the highest gamma exposure. It is the strongest magnet for price.

Why It Matters​

  • Dealers have the most hedging pressure at this level
  • Price gravitates toward the anchor as market makers buy below and sell above
  • The anchor acts as a gravitational center for intraday and short-term price action

How Price Behaves at the Anchor​

  • Price below anchor: Dealers buy to hedge - creates upward pressure (support)
  • Price above anchor: Dealers sell to hedge - creates downward pressure (resistance)
  • Price at anchor: Equilibrium - price tends to pin or oscillate around this level

How to Trade Around the Anchor​

  • Price approaching from below: Consider calls or bull spreads targeting the anchor
  • Price approaching from above: Consider puts or bear spreads targeting the anchor
  • Price at anchor: Sell premium (iron condors, strangles) - range-bound environment
  • Price breaking through anchor: Momentum play - follow the break with defined risk

When the Anchor Changes​

The anchor shifts as:

  • Options expire (OpEx, monthly, weekly)
  • New options are written at different strikes
  • Open interest changes significantly
  • Major market events alter dealer positioning

Best practice: Re-check the anchor daily. It typically updates overnight as new data flows in.

Defense Lines​

What They Are​

Defense Lines are secondary high-GEX strikes - typically 60-80% of the anchor's strength. They act as backup support and resistance levels.

Why They Matter​

  • If price breaks through the anchor, defense lines become the next key levels
  • They define the range boundaries when price is pinned
  • Multiple defense lines create a "zone" of support or resistance rather than a single level

How Price Behaves at Defense Lines​

  • As support: Price may bounce when approaching from above
  • As resistance: Price may reject when approaching from below
  • Weaker than anchor: Breaks are more likely than at the anchor, but still significant

How to Trade Around Defense Lines​

  • Place stops: Set stops beyond the next defense line (not right at it - avoid stop hunts)
  • Target levels: Use defense lines as secondary profit targets
  • Range definition: In neutral (3/5) environments, sell iron condors between defense lines
  • Breakout confirmation: Wait for a clean break of the defense line before entering momentum trades

Visual Explanation​

Price
  ^
  |     [Resistance Zone - Defense Line]
  |     --------------------------------
  |     
  |     [ANCHOR POINT - Brightest Tile]
  |     ================================
  |     
  |     [Support Zone - Defense Line]
  |     --------------------------------
  v
       Strike

GEX Flip Point​

What It Is​

The GEX Flip Point is where gamma changes from positive to negative. Below this level, gamma is positive (stabilizing). Above it, gamma is negative (destabilizing).

Why It Matters​

  • Below flip: Price is stable, range-bound, predictable - ideal for selling premium
  • Above flip: Price is volatile, explosive, unpredictable - ideal for buying premium or avoiding

How Price Behaves at the Flip Point​

  • Below flip: Dealers buy on dips and sell on rips - dampens volatility
  • Above flip: Dealers sell on dips and buy on rips - amplifies volatility
  • At flip: Transition zone - behavior can be choppy

How to Trade Around the Flip Point​

  • Below flip: Iron condors, calendars, butterflies, credit spreads
  • Above flip: Long calls, long puts, directional spreads - avoid selling naked premium
  • Crossing the flip: If price breaks above flip, switch from premium selling to directional buying (or stay flat)

When the Flip Point Changes​

  • Shifts with expiration cycles
  • Moves as dealer positioning changes
  • Can be steep (sharp transition) or gradual (wide zone) depending on the gamma distribution

Summary: Trading by Level​

LevelRolePrice BehaviorBest Strategy
AnchorPrimary magnetStrongest support/resistanceDirection and range definition
Defense LinesBackup levelsSecondary support/resistanceStops, targets, range boundaries
GEX Flip PointVolatility thresholdBelow = stable, above = volatileStrategy selection (sell vs buy premium)

Quick Checklist​

  • Identify the anchor (brightest tile)
  • Note defense lines (secondary bright tiles)
  • Locate the GEX flip point (green-to-red transition)
  • Compare current price to all three levels
  • Choose strategy based on position relative to flip point
  • Set stops beyond defense lines
  • Re-check levels daily