FIELD GUIDE · PLAIN ENGLISH · 8 MINUTE READ
How the market
builds its mountains.
You don't need a quant background to read market terrain. You need six ideas, in order. Everything Orogex renders is built from these.
CHAPTER 01 · THE PLATES
The other side of your trade
When you buy an option, someone sells it to you — usually a market maker whose job is to be on the other side. They don't want your directional bet. So they neutralize it: buy an option, hedge with shares; sell an option, hedge the other way. This is not strategy. It is obligation, written into how market-making works.
Now multiply by millions of contracts. At any moment, dealers as a group hold an enormous, measurable position they are required to keep hedged. That collective obligation is the tectonic plate under the market. It moves slowly. It carries everything on top of it.
FIG. 01 — TWO PLATES
CHAPTER 02 · THE FORCE
Gamma, the force meter
Gamma measures how violently a dealer's hedge must change when price moves. High gamma at a strike means small price moves force large re-hedging flows — real buying and selling, in the actual market, at predictable levels.
Add it up across every strike and expiry and you get GEX: gamma exposure, the market's force map. Where GEX concentrates, hedging flow concentrates. Where hedging flow concentrates, price behavior changes. This is the single most useful number most traders have never seen.
FIG. 02 — THE FORCE METER
CHAPTER 03 · THE REGIMES
Firm ground and landslides
Dealer gamma comes in two signs, and they produce opposite worlds.
Positive gamma: dealers hedge against the move — selling rallies, buying dips. Volatility is absorbed. Ranges hold. Price grinds and pins. Firm ground.
Negative gamma: dealers hedge with the move — selling weakness, buying strength. Volatility is amplified. Moves extend and accelerate. Landslide.
The boundary between the two is the gamma flip. Cross it, and the same market obeys different physics. It is the single most important line on the map.
FIG. 03 — TWO REGIMES
CHAPTER 04 · THE LANDMARKS
The landmarks
Call wall — the strike with the heaviest concentration of call gamma above price. Rallies tend to slow as they climb into it: dealers sell more the closer price gets. A ridge.
Put wall — the mirror below price, built from put gamma. It often acts as first support in a selloff — and if it fails in negative-gamma conditions, the drop below can be fast. A cliff edge.
Gamma flip — the crossing point where dealer hedging changes sign. Above it, hedging calms the market; below it, hedging chases the market. A fault line.
These are not chart patterns. They are locations of obligated flow, and they move as positioning moves. Orogex redraws them continuously.
FIG. 04 — THE CROSS-SECTION
CHAPTER 05 · TIME
Pinning, and the clock
Options expire, and expiration is when the terrain is loudest. Into a big expiry, hedging pressure can hold price near a heavy strike like a ball rolled into a basin — traders call it pinning. The market isn't calm; it's constrained.
Time of day matters too. Zero-days-to-expiry options — now the majority of index option volume — build gamma through the morning, peak in the afternoon, and vanish at the close. The same index can stand on firm ground at 10 a.m. and a landslide at 3 p.m. The map has a clock.
FIG. 05 — THE CLOCK
CHAPTER 06 · VANNA & CHARM
The slow forces
Two quieter forces reshape the terrain without price moving at all.
Vanna: when volatility falls, dealer hedges shift — often forcing mechanical buying into calm. Rallies that "make no sense" on no news frequently make perfect sense in vanna terms.
Charm: as expiration approaches, hedges decay on a schedule, producing slow, persistent flows at predictable times. Weather, not geology — but it moves markets, and it's on the map.
FIG. 06 — THE SLOW FORCES
THE POINT
None of this predicts the future. A map doesn't tell you where you'll walk tomorrow — it tells you where the cliffs are when you do. That is what an edge actually looks like: knowing the ground before you commit capital to it.
GLOSSARY