US stocks tumble as Nvidia slides 4.3%, triggering fresh selloff in technology shares

US equities declined sharply as Nvidia shares fell 4.3%, with the drop spreading to other technology names and reigniting a broader selloff in the sector. Nvidia's weight in major equity indices, including the S&P 500, means a move of this size in a single megacap stock transmits directly to index performance, a mechanism traders often call concentration risk. The pressure appears to reflect a shift in risk appetite toward high-valuation growth stocks, where earnings expectations are most sensitive to changes in sentiment and discount rates. The S&P 500 and the technology-heavy Nasdaq-100 are most exposed, while semiconductor peers and AI-linked suppliers typically move in correlation with Nvidia. Traders will be watching the next Consumer Price Index release and Federal Reserve commentary, since any upside surprise in inflation could push Treasury yields higher and further compress multiples on richly valued technology shares.

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