Semiconductor Index Slides 3.6% to One-Month Low

A sharp drop across US semiconductor names accelerated through morning trading, driving the Philadelphia Semiconductor Index down 3.6% to its lowest mark in nearly a month. The selloff was reported across financial wires, with DeItaone detailing outsized pressure across mega-cap hardware and component suppliers. Nvidia fell 3%, AMD slid 5%, Intel dropped 5.9%, and Marvell Technology traded down 5.5%, while specialized cloud infrastructure names CoreWeave and Nebius dropped 7.1% and 6.7% respectively. The decline follows mounting hardware headwinds and macro jitters after higher-than-expected September CPI data reported by Bloomberg News pushed the 10-year Treasury yield past 5%, resetting cost-of-capital assumptions across high-multiple growth equities. DeItaone noted the chip index is now poised to erase more than $2 trillion in market value over a seven-session retreat, pulling broader equity benchmarks along with it as the Nasdaq composite gave up 1.29%. That hardware drag landed directly on our index book. QQQ sits at 720.37, trading in deep short gamma under its 732.62 gamma flip. In positive gamma, dealer hedging works as a mechanical shock absorber by buying into declines and offering into rallies. When the tape slides below the flip, that dynamic reverses completely: dealers must sell underlying shares as prices decline to remain delta-hedged, accelerating the very moves hitting the screen. With QQQ carrying an expected move of plus or minus 1.65% and skew pinned at 3.7, the immediate boundary sits at the 717 put wall, just three points below current spot. If that level gives way without hedging flow turning, there is little structural cushion before broader options open interest falls away. Across the floor, SPY is also locked in short gamma at 767.11 against its 775.95 flip, sitting just above its own 765 put wall, while VIX trades up at 17.53. The selling in hardware is what broke the tape loose, but dealer hedging is what keeps it slippery. Where this resolves depends on whether spot can claw back toward the flip, but right now the structural pressure remains squarely tilted downhill.