SPY Sits Below 774.01 Flip as Short Gamma Dominates Index Books

The level that matters most today across the equity indices is SPY 774.01. With spot sitting at 762.22, the index is trading squarely below its gamma flip line. In this regime, dealer positioning changes its function. Above the flip, dealers act as a market buffer, buying dips and selling rallies. Below 774.01, they are short gamma, meaning their hedging flow forces them to sell into weakness and buy into strength, expanding price swings rather than dampening them. This short gamma posture is not isolated to SPY. QQQ is trading at 710.89 with its flip at 731.08, and IWM sits at 288.98 against a 295.86 flip. Across all three major benchmark indices, market makers are positioned on the same side of the tape. Benzinga reported earlier today that the Nasdaq fell over 200 points during morning trading, and this structural setup explains why intraday pressure can cascade quickly once downside momentum begins. On the downside, SPY is currently sitting just above its major put wall at 760, with QQQ resting directly on its 710 put wall and IWM touching its 288 put wall. These strike concentrations represent the heaviest put open interest in the current chain. While put walls often act as structural support when dealers absorb selling, a break below 760 on SPY opens up room toward the edge of the daily expected move, which sits at ±0.86%. I logged 1,008 historical sessions tracking daily expected move resolutions in SPY. That backtest shows price closes inside the implied expected move 74.2% of the time, against a baseline of 68%. In the current live tracking sample of 34 sessions, price has stayed inside the move in 33 of them, or 97.1% of the time. However, when all three indices trade in short gamma simultaneously, intraday moves become far sharper even if the final close ultimately respects the broader expected range. Benzinga also noted a 3% jump in crude oil and sharp moves across single stocks, but the structural driver of index volatility today remains dealer hedging. Until SPY reclaims 774.01, dealers are forced to press moves instead of padding them. The 760 put wall is the key line preventing further dealer hedging flows from pushing price down toward the lower boundary of today's expected move.