US stocks today: US stocks end lower as Iran tensions dampen risk appetite; chipmakers drop

Geopolitical tensions between the US and Iran have triggered a sharp pivot in investor risk sentiment, creating a classic flight-to-safety dynamic that penalizes growth-oriented equities. The Technology sector and semiconductor names like WDC and MRVL absorbed material losses as the Nasdaq underperformed, reflecting broader capitulation in cyclical, higher-duration assets.

The blockade escalation drove oil prices higher, benefiting Energy equities and providing a tailwind to the Dow despite broader index weakness. This sectoral divergence signals investor repositioning toward commodity-linked and defensive plays, away from duration-sensitive tech and discretionary exposure. The inverse relationship between risk-off sentiment and chip demand is particularly acute given elevated semiconductor valuations.

Upcoming catalysts—Fed Chair Warsh testimony, inflation data releases, and major bank earnings—introduce significant uncertainty that may either stabilize or extend the current volatility. Market participants are effectively in a holding pattern pending macroeconomic and monetary policy signals that could validate or reverse the current risk-off positioning.

Sector implication: The Technology sector faces headwinds from both geopolitical risk premium and potential growth derating, while Energy benefits from supply concerns. This rotation undermines broad market breadth and suggests investors are reassessing risk tolerance across duration-sensitive and cyclical segments.