Positive gamma and negative gamma are the two weather reports on a GEX chart. People say them like team names. They’re not teams. They’re a guess about which way a dealer’s hedge leans as price ticks.
If dealers are long gamma — positive-gamma regime — the hedge tends to buy dips and sell rips to stay delta-neutral. That can slow a move. The tape gets sticky. Chop. Range stories have a better chance while the assumption holds.
If dealers are short gamma — negative-gamma regime — the hedge tends to sell weakness and buy strength. Flow leans with the move. Moves can run farther than they “should.” A break can accelerate instead of reverse.
Is it always true? No. You never see the desk. Thin names, events, overwriting, a quiet book — the model is wrong on a lot of afternoons. Treat it as a weather map, not a GPS.
If you want the live picture, open Gamma. This page is the two regimes. The line that splits them is the gamma flip.
What “long gamma” actually means
Gamma is how fast delta changes when the underlying moves. If you’re long an option, you’re long gamma (plain vanilla, no extras). If you’re short an option, you’re short gamma.
Market makers sell a lot of the calls and puts you see on SPY, QQQ, NVDA. In the standard model they’re net short those options, so they’re net short gamma a lot of the time — until they aren’t. Customers can be net short too: covered calls, call-overwriting ETFs, vol selling. Then dealers can end up long gamma. The chart doesn’t interview them. It infers from listed open interest and a guess about who is on which side.
When the model says dealers are long gamma at a strike, the hedge to stay delta-neutral looks like this: price drops, delta of the long-gamma book falls, they buy the underlying to catch up. Price rips, delta rises, they sell. Buy the dip, sell the rip. From the outside it looks like a shock absorber.
That’s why a fat +Gamma bar (cyan on our chart) gets nicknamed sticky. Max +Gamma is the strike where that absorber is loudest. In a positive-gamma tape, the call wall and put wall have a better chance of behaving like a range, because the hedge is fighting the move.
“Better chance” is doing a lot of work in that sentence. Absorbers fail. Headlines exist. 0DTE can overwhelm a monthly absorber by lunch.
What “short gamma” actually means
Short gamma is the shock absorber run in reverse.
Price drops. The short-gamma book’s delta gets more short. To catch up they sell more underlying. Price rips. Delta gets more long. They buy. Sell weakness, buy strength. From the outside it looks like someone is feeding the move.
That’s why a fat −Gamma bar (red on our chart) gets nicknamed fuel. Max −Gamma is the strike where that fuel is loudest. Below the gamma flip, walls are easier to punch. A break can accelerate. People say “negative gamma squeezes.” Sometimes the tape looks like that. Sometimes it’s just a thin Tuesday.
Short gamma is not “bearish.” The hedge buys rips too. Negative gamma can be a melt-up machine as easily as a flush. The regime is about *amplification*, not direction. If you hear “we’re in negative gamma so it has to dump,” that’s a camp, not a model.
The gamma flip is the regime line
The gamma flip — also zero-gamma level, gamma pivot, ZGL — is where net GEX crosses zero. Above it, the stacked profile is net positive. Below it, net negative. That’s the cartoon.
On a real chain the flip is a strike (or a price between strikes) that moves when you change expiries, when OI changes, when spot runs and moneyness reshuffles the stack. It is not a buy stop. Crossing it does not mean go long or go short. It means the model’s regime line moved relative to spot.
Sometimes the flip sits above the market all day and nobody cares. Sometimes spot chops across it and the chart looks like a blender. The line is a weather front. You don’t place an order on a cold front.
I look at spot versus the flip first, before I tell a wall story. If you skip that, a call wall “failing” is just you applying a positive-gamma story to a negative-gamma tape. That order is also how I read the GEX chart.
Positive versus negative is not only a global regime. Individual strikes print +Gamma and −Gamma on the same profile. You can be net positive overall and still have a vicious red bar under the market. Global weather, local storms. Both are on the chart. Don’t flatten them into one adjective for the whole day.
What the tape can look like — and what it doesn’t prove
In a positive-gamma afternoon the path often looks like work: probes at the call wall, probes at the put wall, a lot of time in the middle. People call it pinned. Pinning is a word from expiry. Don’t steal it for 11 a.m. unless you’re looking at 0DTE. Sticky is enough.
In a negative-gamma afternoon the path can look unfair. A level that “should” hold doesn’t. A squeeze runs farther than the last three days. That can be hedge flow. It can also be a headline, a stop cascade, a thin book. GEX does not get to take credit for every trend.
The worst read is using yesterday’s regime as today’s personality. OI rolls. 0DTE dies at the close. A monthly expiry takes a pile with it. Morning can be long gamma on monthlies and short gamma on the same-day strip. If you left “all” expiries on, you mixed the weather reports. The smoothie problem again.
Intraday the regime can change without anyone “deciding.” Spot runs through the flip. Moneyness reshuffles. A 0DTE pile that was +Gamma at 10 a.m. is −Gamma at 2 p.m. because the market walked through it. That’s not a new philosophy. That’s the same stack, new location. If you named the day “positive gamma” at the open and refuse to look again, you’re reading a morning tweet, not a chart.
Index versus single name matters here too. SPY can print a clean flip and a clean cyan/red split. A thin name can print a red bar that’s three thousand contracts and a breeze. Same words. Different animal. Negative gamma on NVDA is not negative gamma on SPX. We still show both. Don’t import an index personality onto a single stock because the colors match.
What positive and negative gamma are not
They are not bullish and bearish. Long gamma can sit through a grind up if the absorber is selling rips into a slow bid. Short gamma can melt up. Sign is about hedge *direction relative to the last tick*, not about the week’s destination.
They are not a trading signal. “Positive gamma so fade” and “negative gamma so chase” are how people donate money to the tape. The chart tells you how the hedge *might* lean. It does not tell you to click buy.
They are not max pain. Max pain is an expiry toy. Regime is a GEX toy. Different drawers.
They are not proof dealers are actually long or short. The model infers. Covered-call funds, structured notes, customer shorts — the inference can be backwards. When the tape refuses to act sticky in a “positive” stack, believe the tape. The map was wrong, or the mix of expiries was wrong, or something else was louder than gamma.
They are not the same as open interest. You can have huge OI and still be in a quiet-gamma neighborhood. You can have a violent negative-gamma bar on modest OI. Contracts versus shove.
How this looks on our Gamma tab
Cyan bars: +Gamma. Red bars: −Gamma. Purple: ABS GEX (how loud, ignoring sign). Max +Gamma and Max −Gamma are the two loudest signed strikes. Gamma flip is the zero crossing. ABS GEX will often peak near one of those, but it can peak on a mixed strike that’s dense without winning the sign contest.
Tap a row. The help text on Max +Gamma talks about pinning or slowing. The help text on Max −Gamma talks about acceleration. Those are the usual stories. They are not orders.
Pick expiries before you name the regime. A 0DTE-only view can be screaming short gamma while the monthly stack is long. “The market is in negative gamma” is incomplete until you say *which mix*.
Guests get a delayed snapshot. A free account keeps a journal and one full report. Pro is unlimited tickers, not a secret regime. Single names are noisier than SPY or SPX. A “negative gamma” print on a thin name can be three market makers and a breeze. Don’t read it like an index.
A short way to use the two regimes without a playbook
- Spot versus the gamma flip — which weather report.
- Where Max +Gamma and Max −Gamma sit relative to spot.
- Whether that stack is 0DTE, weeklies, monthlies, or a smoothie.
- Then stop. Sticky versus runaway is a tendency, not an entry.
If those four are boring, good. Boring is the point. You wanted a map. You got a map.
Also in this series: what GEX is, gamma flip and walls, how to read a GEX chart, 0DTE gamma.