US stock market today: Dow, S&P 500, Nasdaq fall amid tech sell-off, Iran tensions

US equity indices declined in the session, with the Dow, S&P 500 and Nasdaq all lower as a sell-off in technology shares weighed on the broader market alongside heightened tensions involving Iran. The transmission runs through two channels: a risk-appetite shift that pulls capital away from high-multiple growth equities, and a geopolitical premium that lifts oil and defence-related demand while raising uncertainty over energy supply and global growth. The Nasdaq 100 and the S&P 500, given their heavy weighting toward large-cap technology names, are the most exposed, while energy-sensitive sectors and Iran-linked market proxies face the most direct repricing from the geopolitical headlines. Traders will watch whether crude oil prices extend their gains and whether Treasury yields move lower as safe-haven demand builds, since a sustained rise in oil would feed into inflation expectations and complicate the rate outlook for equities.

The Nasdaq-100 (NDX) is the US large-cap tech benchmark. NDX is more sensitive to rate decisions than SPX because of longer-duration cash flows, and heavily concentrated in Tech/Comms names — mega-cap earnings season dominates price action.

HIGH-impact news is typically a market-moving event with multi-pip or multi-percent intraday reactions. Examples include central bank rate decisions, major CPI/NFP releases, geopolitical shocks, mega-cap earnings beats/misses, and regulatory announcements. Traders typically position-reduce or hedge ahead of scheduled HIGH-impact events, and follow the wire in real time to react to unscheduled ones (war headlines, central-bank emergency statements, surprise corporate actions). The Trading News Terminal squawk box reads every HIGH-impact headline aloud the moment it hits the wire — so active traders don't have to stare at the feed.

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