How to Read GEX/DEX (Gamma Exposure)

Yuka Finance Guide — market maker structure and volatility regimes

If you've ever watched an index suddenly accelerate for no obvious reason, or seen it stay "pinned" to a price level for several sessions, options market structure is often the hidden driver. GEX (Gamma Exposure) and DEX (Delta Exposure) measure this phenomenon precisely.

What Is GEX?

GEX measures the net gamma exposure held by options sellers — overwhelmingly market makers providing liquidity on listed options chains. Two opposing regimes matter:

Positive gamma — market makers buy as price falls, sell as it rises. This dampens movement, keeping the market in tighter ranges.
Negative gamma — the dynamic flips, mechanically amplifying moves in both directions. This is where the sharpest, self-reinforcing moves occur.

The tipping point between regimes is the gamma flip — a closely watched price level.

DEX: The Essential Complement

While GEX tells you about intensity, DEX tells you about direction. It measures dealers' net delta exposure — the amount of underlying they must hold or sell to stay hedged.

Concrete example: an index trading above its gamma flip in a positive regime sees support-breakdown attempts quickly bought back by market makers. If price falls below the flip, those same dealers must now sell as price falls — accelerating the decline instead of cushioning it.

Limitations to Keep in Mind

GEX/DEX rests on modeling assumptions that can vary between data providers — the trend and regime matter more than the exact figure. It remains a structural indicator, not a sentiment one, and works best combined with price structure and institutional positioning data.

Track GEX/DEX in real time, effortlessly

Yuka Finance calculates GEX, DEX, and the gamma flip live for major indices and liquid stocks — for free.

See GEX/DEX on Yuka Finance →