Whether dealers are net long gamma or short gamma determines whether their hedging damps volatility or amplifies it — the single most important regime read for intraday SPY. It’s the practical face of positive vs negative gamma.

Long gamma: the damping regime

When dealers are long gamma (positive net GEX), their hedging is stabilizing: as price rises their delta grows, so they sell into strength; as price falls their delta shrinks, so they buy weakness. This damps volatility — dips get bought, rips get sold, and price gets pinned in a range. Calm, mean-reverting, fade-friendly tape.

Short gamma: the amplifying regime

When dealers are short gamma (negative net GEX), hedging amplifies: as price rises they must buy more, as it falls they must sell more — chasing the move. This accelerates trends and breaks, produces sharp moves and gaps, and makes support/resistance more likely to fail. Volatile, trending, breakout-friendly tape.

Long gamma dealers lean against the move (calm); short gamma dealers pile into it (violent). Knowing which regime you’re in tells you whether to fade or chase.

What it means for a scalper

This regime read should shape your whole approach: fade extremes in long gamma, trade breakouts/trends in short gamma. Fighting the regime is how you get chopped. The gamma flip is the price where the regime switches. NoVo maps the live net GEX regime so you always know which game you’re playing.