US stocks today: Nasdaq lags on angst over AI spending ahead of earnings reports

The Nasdaq's underperformance reflects sector-specific headwinds rather than broad market stress, with chip and mega-cap tech stocks facing renewed scrutiny over artificial intelligence capex sustainability. Investors are pricing in the risk that reported AI spending may fail to deliver proportionate revenue uplift, creating a valuation reset ahead of Q4 earnings season.

The divergence between the Nasdaq's decline and the Dow's modest gains signals a rotation toward value and defensive positioning. Energy's stability on falling oil prices provides a tactical hedge, though geopolitical and tariff uncertainties prevent a clean defensive rally. This mixed backdrop suggests market participants are de-risking large-cap tech exposure as a precautionary measure.

Upcoming earnings from AAPL, MSFT, and AMZN will be critical inflection points; management guidance on AI capex efficiency and return expectations will likely determine whether sentiment stabilizes or deteriorates further. The market is currently pricing in elevated skepticism rather than confirmation bias.

Sector implication: Technology faces tactical headwinds but remains structurally exposed to macro earnings surprises. A broadening decline would require evidence of demand destruction, not merely caution about spending ratios. Current mixed-market condition reflects healthy skepticism rather than systemic stress.