Tech Sinks Intraday as Index Gamma Flips Negative Across the Board

Tech stocks took the brunt of a late-afternoon pullback, with MT Newswires reporting a broad decline across the sector as the 10-Year Treasury yield crossed the 5% threshold. Against that backdrop, MT Newswires noted US equity indexes retreating intraday while Benzinga reported the Nasdaq 100 slipping as mega-cap chipmakers and AI leaders pulled back. While headline writers focused on rate pressure and sector updates, my read on the dealer map shows a distinct structural shift that explains the afternoon acceleration. Across all three major market proxies, spot price has dropped below the gamma flip. SPY sits at 761.03 against a flip of 771.68, QQQ is at 709.98 against a flip of 719.33, and IWM rests at 287.97 under its 293.83 flip. When spot sits below the gamma flip, market makers are positioned short gamma. Instead of acting as shock absorbers by buying dips and selling rallies, dealers are forced to hedge in the direction of the trend—selling underlying futures as price drops and buying as it rises. This regime change removes the usual stabilizing buffer from the tape, leaving price movements wider and less forgiving. Downside buffers are visible on the book, but they sit right at current levels. SPY has its put wall at 760, just below spot, while QQQ’s put wall rests at 705 and IWM’s sits at 287. Overhead, SPY’s call wall at 770 and QQQ’s at 720 mark the upside boundaries where heavy resistance sits. Options market pricing indicates an expected move of ±0.78% for SPY, ±1.03% for QQQ, and ±0.98% for IWM. In my scored track record across 1,008 historical sessions, SPY’s expected move calculation has held price inside its expected range 74.2% of the time against a 68% baseline. Furthermore, my logged record shows that when spot trades outside the flip in short gamma, realized volatility consistently outpaces the quiet sessions logged in positive territory. The wire reported the afternoon selloff, but the dealer book shows why the slide picked up speed once those flip levels gave way.