Why it matters
The regime tells you what kind of tape to expect. In positive gamma, the hedging flow works like a shock absorber: a push lower meets buying, a push higher meets selling, and the stock tends to grind inside a range and settle near heavy strikes. In negative gamma, the same flow works like an accelerator: selling begets more selling and rallies get chased, so ranges widen and moves that start tend to extend.
Robinflow labels every optionable ticker's regime from its net gamma exposure and shows it next to the call wall, put wall and spot price on its symbol page. On the GEX heatmap the same information appears cell by cell: gold and green cells are positive magnets that tend to attract and pin price, purple and red cells are negative zones where price can accelerate through.
The two regimes also change how the walls behave. In positive gamma, walls act like brakes. In negative gamma, a wall that gives way can turn into a trapdoor, because the hedging on the far side pushes in the direction of the break.
What it does not tell you
- It is not a direction call. Positive gamma does not mean up and negative gamma does not mean down. It describes the size and character of moves, not their sign.
- It is a net figure. A ticker can be in a positive regime overall while carrying a large negative zone just below the price. The heatmap shows the zones; the regime label does not.
- It changes. Regimes switch when positions change or expirations roll, sometimes overnight. The label describes the session it is stamped with.
- Index products behave differently from single stocks. Index ETFs carry heavy put hedging, so they spend more time in negative gamma than most single names. Compare a ticker with itself over time rather than with an index.
What it looks like in the data
On September 14, 2026 the Nasdaq-100 ETF closed in a negative gamma regime while Apple closed in a positive one.
Negative regime: net exposure of −$1.2B means hedging leaned with the move that session. Price closed midway between the walls, 1.4% above the put wall and 1.4% below the call wall. Drawn to scale. Not a price target.
| Ticker | Session | Regime | Net gamma exposure | Put wall | Spot at close | Call wall |
|---|---|---|---|---|---|---|
| QQQ | Sep 14, 2026 | Negative | −$1.2B | $700 | $709.73 | $720 |
| AAPL | Sep 14, 2026 | Positive | +$378.3M | $332 | $332.78 | $340 |
Read together: the ETF sat in the middle of a negative-gamma band, where either wall giving way could extend the move, while Apple closed on its put wall inside a positive band, where hedging leaned against a further drop. Two different tapes on the same day, which is the point of checking the regime before reading anything else on the page.
