Net GEX is a live quantity: it changes as spot moves through the gamma profile and as positioning shifts. So the regime you read at 9:30 can invert by lunch — the same event as price crossing the gamma flip, viewed through the GEX lens.

How the flip happens live

As price falls toward and through the flip, net GEX slides from positive toward zero and then negative. The market doesn't announce it — but the tape changes: dips that were getting bought stop bouncing, ranges that were compressing start expanding, and levels that were holding give way. A calm, mean-reverting morning becomes a trending, amplifying afternoon.

A live GEX flip is a regime change with no bell to ring. The tape tells you before the dashboard does — if you know what to watch.

Spotting it in real time

Watch for the cluster of tells: a failed bounce at a level that had been holding, expanding range and rising velocity, and price sitting on the wrong side of the flip without snapping back. Any one can be noise; together they say the sign has changed. A live-updated map that recomputes net GEX through the session catches it earlier than a static open-of-day snapshot.

How to trade it

The moment GEX flips negative, switch playbooks — stop fading, respect trend, size down (how to trade negative gamma). The reverse cross back to positive is your cue to bring fades and pins back. The single most expensive mistake is running your morning's positive-gamma playbook into an afternoon that quietly flipped negative. Re-check the regime; don't assume it.