0DTE Gamma outlook for today's session

SPX and NDX begin the session in negative gamma regimes while RTY remains in positive gamma territory.

Market structure

Market	Regime	Trend Odds	Character
SPX/ES	Negative Gamma	55%	Expansion
NDX/NQ	Negative Gamma	55%	Expansion
RUT/RTY	Positive Gamma	15%	Mean Reversion

Negative gamma environments often produce larger directional moves as dealer hedging amplifies market movement. Traders should respect expansion zones and avoid assuming mean reversion in SPX and NQ. RTY currently presents a different structure with lower trend-day probabilities. For 0DTE participants, the key question is whether the session remains inside compression zones or breaks into expansion territory. The current gamma profile favors elevated vigilance for trend development in SPX and NQ.