Learn · options market structure
What does negative gamma mean for the stock market?
Negative gamma means options dealers are, on balance, short gamma, so their hedging buys as prices rise and sells as prices fall. That hedging adds to moves instead of dampening them, which is why negative-gamma sessions tend to have wider ranges and more trending intraday action. It describes conditions, not direction.
Dealers amplify moves: trending and higher intraday volatility.
Positive versus negative gamma
In positive gamma, dealers sell rallies and buy dips to stay hedged, which compresses ranges and favours pinning near large strikes. In negative gamma, the same hedging chases price, so moves extend.
What changes it
The regime flips when price crosses the level where net dealer gamma changes sign, and as options expire or new positions open. Large expirations can change it overnight.
Reading it with other data
Volatility indexes and realized range usually rise in negative gamma. The regime says how hard moves may run, not which way they go.
Related
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