SPX Dealer Positioning

"Dealer positioning" for SPX provides a vital lens into the collective options exposure of market makers, particularly their net gamma. This is critical because their hedging activities directly influence market dynamics. When dealers are collectively net short gamma, they are compelled to sell into rallies and buy into dips to maintain a delta-neutral book. This reactive hedging can amplify price movements, contributing to higher realized volatility, especially around significant strike clusters. Conversely, if dealers are net long gamma, they would buy into dips and sell into rallies, acting as a dampening force that can absorb volatility and keep price action more contained. On a chart, you would observe these net gamma positions aggregated across various SPX strike levels, often showing significant concentrations or "walls" at specific points. A substantial cluster of short gamma below the current SPX price, for example, might suggest increased downside acceleration if that level is breached, as dealers are forced to sell. Conversely, a flip from a net short to a net long gamma regime can signal a shift in market character, moving from choppy and trending to more range-bound. For a volatility-focused trader, understanding these critical dealer levels helps anticipate whether market movements are likely to be amplified or absorbed, offering crucial insight into potential support or resistance driven by hedging flows. Full live view on CrossVol Terminal.