US stocks tumble as semiconductor index sinks 11%; Nvidia, AMD lead tech sell-off - CNBC TV18

US equities declined sharply as the semiconductor index fell 11%, with Nvidia and AMD leading the tech sell-off, according to CNBC-TV18. The move points to a concentrated repricing within the chip sector rather than a uniform broad-market deleveraging, since the headline ties the decline specifically to semiconductor names. The transmission channel appears to be sector-specific risk appetite, where elevated valuations in AI-linked semiconductor stocks compress rapidly when growth expectations or earnings sentiment shift. Nvidia and AMD carry the most direct exposure given their weight in the index and their sensitivity to AI-infrastructure spending narratives, while the S&P 500 is affected through its heavy technology weighting. Traders should watch the next session's trading in semiconductor peers and any upcoming hyperscaler capital expenditure guidance, which would indicate whether demand expectations for advanced chips are being revised.

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