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 sign. Above this level, gamma is positive (stabilizing). Below it, gamma is negative (destabilizing).

Why It Matters#

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

How Price Behaves at the Flip Point#

• Above flip: Dealers buy on dips and sell on rips - dampens volatility
• Below 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#

• Above flip: Iron condors, calendars, butterflies, credit spreads
• Below flip: Long calls, long puts, directional spreads - avoid selling naked premium
• Crossing the flip: If price breaks below 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#

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