Beyond GEX
DEX · VEX · CHEX

Why GEX Isn't Enough

GEX tells you about volatility — whether moves will be dampened or amplified. But it says nothing about direction, volatility sensitivity, or time decay. To understand the full picture of dealer positioning, you need all four Greeks.

DEX — The Directional Edge

Delta exposure (DEX) reveals the net directional bias of dealer hedging at each strike. While GEX tells you how much dealers must hedge, DEX tells you which direction.

High positive DEX at a strike means dealers hold significant long delta exposure there. If the stock drops toward that strike, dealers must sell to stay hedged — adding selling pressure. If it rises above, their delta position works in their favor and hedging pressure eases.

DEX is particularly useful for identifying directional gravity — the price levels where dealer hedging flows create a natural pull.

VEX — Reading Volatility-Driven Flows

Vanna exposure (VEX) measures the sensitivity of dealer delta to changes in implied volatility. This is the cross-Greek that explains why markets rally when IV drops and sell off when IV spikes.

• Positive vanna + falling IV: Dealers' deltas decrease → they sell the underlying → vol-compression rally
• Positive vanna + rising IV: Dealers' deltas increase → they buy the underlying → amplifies the selloff

VEX is critical around events like FOMC meetings, earnings, and VIX term structure inversions — any time IV is moving significantly.

"VEX explains the famous 'vol-compression rally' — when IV drops, vanna-driven flows force dealers to sell, creating a mechanical bid that pushes price higher."

CHEX — The Expiration Countdown

Charm exposure (CHEX) measures how dealer delta changes from the passage of time alone. As options approach expiration, their deltas drift — calls decay toward 0 or 1, puts decay toward 0 or -1.

This creates a ticking clock of hedging adjustments. CHEX quantifies this flow. It's most important in three scenarios:

1. 0DTE trading: Charm is the dominant force on expiration day. Understanding CHEX tells you where the EOD hedging unwind will hit.
2. Weekly options Friday: As the weekly expiration passes, charm-driven flows can move markets into the close.
3. Heavily front-weighted OI: When most open interest is in near-term expirations, CHEX becomes a primary driver of intraday price action.

Using GEX + DEX + VEX + CHEX Together

The four exposure metrics complement each other:

1. GEX tells you the volatility regime — will the market be calm or explosive?
2. DEX tells you the directional lean — where are hedging flows pulling price?
3. VEX tells you the vol-sensitivity — what happens if IV moves?
4. CHEX tells you the time sensitivity — what happens as expiry approaches?

A professional setup: check GEX for regime, DEX for direction, then VEX to assess event risk and CHEX for expiry-day flows.