What is the gamma flip level?
The gamma flip is the price where the estimated dealer book goes from net positive to net negative. It is widely sold as a regime switch that changes how every level on the board behaves. What it actually is is simpler: a price where net gamma changes sign — useful context, not a trigger.
How it is derived
Aggregate dealer gamma is not constant across prices — it is calculated strike by strike, so the total changes as spot moves. The flip is the price at which that total crosses zero.
What matters is which side of zero the book is on at the current price. Positive gamma absorbs; negative gamma amplifies — measured, negative gamma has run about a quarter more movement ahead. The flip is just where that sign would change if price got there.
What the flip is not
It is not a line that decides how every level behaves. Nothing we have tested supports treating it as a switch that changes how the levels around it behave, and crossing the flip is not a tested trade trigger. Like any other level, it is not a bounce point.
Where it does show up in our read is on the path. A sign flip sitting between price and a far level made that level harder to reach when we graded it, so the read counts a far flip as a checkpoint. That is a statement about reach, not about direction.
How it moves
The flip is not fixed. It shifts as positioning changes, and levels move more in expiry weeks when large blocks of open interest roll off — though when we tested it, levels in expiry week did not hold any worse than in other weeks. They just move more.
That is worth internalising generally: levels drawn from an option board have a short shelf life. When we measured it, roughly a quarter of dealer walls had moved by the next session and about half were gone within a week. Treat any level as today's read, not a standing line on your chart.
| Where price sits | Dealer book | What hedging does | What that feels like |
|---|---|---|---|
| Above the flip | Net positive gamma | Sells rallies, buys dips | Absorbs; ranges tend to be smaller |
| At the flip | Near zero | Little net hedging force | No strong lean either way |
| Below the flip | Net negative gamma | Buys rallies, sells dips | Amplifies; about a quarter more movement ahead |
Common questions
What happens when price crosses the gamma flip?
The sign of the book at price changes, so hedging goes from absorbing to amplifying or back. That changes how much movement to expect over the coming days. It is not a tested entry signal, and it does not change how the other levels on the board behave.
Is the gamma flip a directional signal?
No. It says how price is likely to MOVE — absorbed or amplified — not which way. Below the flip a rally and a selloff both travel faster; the flip has no opinion about which one you get.
How often does the flip level move?
Daily, and more in expiry weeks. When we measured our own book, roughly a quarter of dealer levels had shifted by the next session and about half were gone within a week — treat the flip as today's read, never a standing line.
Where can I see the flip level live?
The free SPY board shows the live gamma map with the walls and the ★ Apex — no login, on a 15-minute delay. The flip level and the full read, with every level priced by whether the ticker can actually reach it today, are on the member maps.
The flip is a price where net gamma changes sign — nothing more. Read the sign at the current price for the day's character, treat a far flip as a checkpoint on the path, and re-read it daily: it moves.
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See it on a live board
FlowMonkey prices every level by whether your ticker can actually reach it today — measured on that symbol's own range, re-sorted as the session burns down.
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