Semiconductor and optical networking stocks surged overnight as investors rotated back into AI infrastructure plays following Nvidia's strong spending guidance. SanDisk (+11.0%), Seagate (+7.2%), Lumentum (+12.0%), and Ciena (+5.8%) led the charge on renewed data center demand, while IBM (+11.1%) jumped on a Trump administration quantum computing grant. Elsewhere, Ralph Lauren (+14.1%) and Williams-Sonoma (+6.1%) crushed earnings on strong consumer spending and supply chain improvements, but Walmart's (-6.6%) profit miss despite revenue beat signaled concerning margin compression in retail. Broad indices gained modestly—SPY +0.20%, QQQ +0.15%—but the real action concentrated in sector rotation from defensive to growth and luxury plays.
Buy the dip in memory and optical connectivity names (SNDK, STX, LITE, CIEN) if they consolidate—the AI infrastructure trade remains intact despite overnight volatility. Avoid Walmart and defensive retail until margin trends stabilize; however, luxury consumer (RL) and higher-end discretionary (WSM) show resilience and warrant consideration. Hold tech ETFs (QQQ, TQQQ) through this sector-specific strength; the broadening participation from semiconductors to consumer suggests healthy market internals beneath modest headline gains.