US stocks today: US stocks end higher as Iran tensions ease; major tech-related shares jump

US equities rallied sharply with the Dow Jones reaching a record close, driven primarily by de-escalation of geopolitical tensions between the US and Iran. Risk-off sentiment reversed as investors repositioned into higher-beta equity positions, with the Nasdaq composite surging over 2% and outpacing broader indices. This suggests a broad risk-appetite recovery rather than sector-specific strength.

Technology stocks emerged as the primary beneficiary of the sentiment shift, with Alphabet (GOOGL) and other mega-cap names gaining momentum. The sector's outsized performance reflects typical "risk-on" rotation patterns when geopolitical headwinds ease. Comcast (CMCSA) and implied SpaceX positioning also contributed, indicating that communications and infrastructure plays benefited from improved market tone.

The earnings season narrative backdrop provides additional support, as investors appear willing to price in growth expectations amid improved sentiment. This represents a technical relief rally following prior volatility, with breadth indicators likely showing broad participation across market-cap segments. The record Dow close signals institutional confidence in fundamental valuations.

Sector implication: Technology and Communication sectors show positive momentum tied to risk sentiment rather than fundamental catalysts. Correlation with broader market indices is elevated, indicating this is a macro-driven sentiment event. Persistence depends on sustained easing of geopolitical tensions and earnings delivery.