Gamma Pressure: Understanding the Greek Flow Score

What is Gamma Pressure?

Dealer hedging is driven by more than just gamma. As implied volatility changes throughout the day (Vanna flows) and as time passes (Charm flows), dealers must continuously rehedge their entire book — not because price moved, but because the Greeks of their options positions changed. These mechanical rehedging flows can be substantial and can push price in a consistent direction even without a fundamental driver.

Gamma Pressure captures all three of these flows simultaneously and combines them into a single composite score from 1 to 10. When the score reads 8 with all three arrows pointing the same direction, it means three independent mechanical forces — each driven by a different Greek — are all pushing price in the same direction simultaneously. This is a powerful structural confluence that operates independently of news, sentiment, or technical levels.

The Three Greeks: Gamma, Vanna, Charm

Gamma (Γ) — The primary hedging flow. When dealers are long gamma (the standard Long Gamma regime), they buy dips and sell rips to stay delta-neutral. This dampens volatility and creates mean-reverting behavior. When dealers are short gamma, they amplify moves. This is the main GEX regime driver that the rest of the dashboard is built around.

Vanna (dΔ/dIV) — Sensitivity of dealer delta to implied volatility changes. When IV drops (common on green, trending-up days), dealers who are short vanna must buy the underlying to rehedge — a mechanical buying flow that accompanies IV compression. When IV spikes, the opposite occurs: vanna flows become a selling pressure as dealers rehedge in the other direction. Vanna flows can be large on days with significant IV moves, particularly around major macro events or sharp market reactions.

Charm (dΔ/dTime) — Sensitivity of delta to time decay. As options approach expiration, their delta changes continuously due to time decay, even without any price movement. Dealers must rehedge this delta drift daily. The charm flow is a directional force purely from time passing — entirely mechanical, completely independent of news or price action. Charm flows are strongest approaching OPEX (when options are near expiration and charm is highest) and on 0DTE-heavy days when the time decay of expiring contracts creates the largest delta drift per hour.

Reading the Score (1–10)

The composite Gamma Pressure score reflects the overall magnitude and alignment of all three greek flows:

• 1–3: Weak or mixed pressure — no strong mechanical direction from greek flows. The three flows are either weak in magnitude or contradicting each other, resulting in low net mechanical pressure. Structure-based analysis should lean primarily on GEX levels rather than greek flow direction.
• 4–6: Moderate pressure — some alignment between greeks, mild directional bias from mechanics. Worth noting as a contributing factor when combined with other signals, but not strong enough to be decisive on its own.
• 7–8: Strong pressure — significant mechanical alignment. Two or three of the greek flows are meaningfully aligned in the same direction with reasonable magnitude. This level of pressure is worth explicitly including in your analysis and strategy selection.
• 9–10: Extreme pressure — all three greeks are strongly aligned in the same direction simultaneously. Rare condition that historically correlates with higher follow-through than lower-score readings. When you see a 9–10 score, the mechanical forces are at maximum — the market has a strong mechanical tailwind or headwind from dealer rehedging.

Important: the score indicates magnitude and alignment, not direction. A score of 9 means strong mechanical pressure — but you need to look at the arrows to know which direction that pressure is pointing.

Directional Arrows

Each of the three greeks has its own directional arrow alongside the composite score:

• ↑ (bullish/buying pressure) — this greek's hedging flow is mechanically buying the underlying. Gamma ↑ = Long Gamma (dealers buy dips). Vanna ↑ = IV compression (dealers buy on vol decline). Charm ↑ = time decay creating upward delta drift (dealers buy to rehedge).
• ↓ (bearish/selling pressure) — this greek's flow is mechanically selling. Gamma ↓ = Short Gamma (dealers sell dips). Vanna ↓ = IV expansion (dealers sell as vol rises). Charm ↓ = time decay creating downward delta drift.

All three ↑ (score 8+): Maximum bullish mechanical pressure. Three independent mathematical forces are all mechanically buying — the market has a strong structural tailwind from dealer rehedging flows. This is the highest conviction positive mechanical setup.

Mixed arrows: Conflicting flows. For example, Gamma ↑ but Charm ↓ means gamma flows are bullish but time decay is creating selling pressure from Charm rehedging. These flows partially offset each other — the net mechanical pressure is lower than the individual components would suggest. Reduced conviction, with the mechanical forces working against each other.

The most powerful setup: high score (8+) with unanimous arrow direction — all three mechanical flows pushing the same way simultaneously.

Using Pressure in Practice

Gamma Pressure functions as a confirmation layer, not an initiation signal. Use it to increase or decrease confidence in directional trades rather than as a standalone signal:

Bullish trade with Gamma Pressure score 8, all arrows ↑: Three mechanical forces at your back. This is structural wind helping the trade — worth adding conviction and potentially sizing up relative to lower-pressure conditions.

Bullish trade with Gamma Pressure score 3, mixed arrows: Mechanics are not supporting the trade. This doesn't mean the trade is wrong — it means the mechanical backdrop is neutral to negative, and the trade relies more heavily on price action, flow, or fundamental thesis. Size accordingly.

The three scenarios where Gamma Pressure adds most value:

1. OPEX weeks — Charm flows are at their maximum during OPEX week as all monthly contracts approach expiration simultaneously. The Charm direction on OPEX week can create sustained buying or selling pressure across the entire week that technical analysis alone cannot explain.
2. Days with large IV moves — Vanna becomes the dominant flow on days when implied volatility makes large moves. A 2-point drop in VIX triggers substantial Vanna buying; a 2-point VIX spike triggers the opposite. The Vanna arrow on high-vol-move days is the most actionable signal in the panel.
3. Mornings after gap-and-go setups — all three greeks may align in the gap direction as the market opens, creating a mechanical momentum that extends the gap rather than filling it. Gamma Pressure score can help distinguish mechanical gap-extends from structural gap-fills.