Key Highlights

  • The S&P 500 fell 0.45 percent to 7,503.36 points, while the Nasdaq Composite dropped 1.19 percent.
  • Micron and Sandisk both declined, pulling the PHLX semiconductor index lower.
  • Samsung's blowout earnings report failed to satisfy investors with elevated expectations.
  • Reports that Chinese startup DeepSeek is developing its own AI chip added to chipmaker jitters.

Broad Market Decline Led by Semiconductor Weakness

The S&P 500 ended Tuesday's session lower, weighed down by losses in Micron Technology and other chipmakers amid mounting investor doubts about the sustainability of Wall Street's AI-driven rally. The index lost 34.07 points, or 0.45 percent, to close at 7,503.36 points, while the Nasdaq Composite fell more sharply, losing 310.06 points, or 1.19 percent, to 25,811.10, and the Dow Jones Industrial Average declined 140.30 points, or 0.26 percent, to 52,915.61 after touching an all-time high earlier in the session.

Chip stocks across both Asian and US markets declined after memory chip giant Samsung Electronics reported blowout earnings that nonetheless failed to satisfy investors holding elevated expectations, with Micron and Sandisk both falling and pulling the PHLX semiconductor index lower in sympathy.

Competitive Threats Add to Investor Unease

Adding to concerns about high-flying chipmakers, reports emerged that Chinese startup DeepSeek is developing its own AI chip, a development that could potentially reduce the company's dependence on Nvidia and Huawei chips over time. This news compounded existing worries about whether current valuations for AI-related semiconductor companies adequately reflect emerging competitive dynamics within the industry.

Zachary Hill, head of portfolio management at Horizon Investments, characterised the session as a continuation of recent weeks' theme, describing it as rotation following a blistering run in AI buildout, semiconductor and memory stocks, with expectations having grown to what he described as almost impossible levels for these companies to beat consistently.

Additional Volatility Expected From Upcoming Listings and Data

Investors face another test of appetite for chip stocks on Friday, when South Korean semiconductor giant SK Hynix begins trading on the Nasdaq following its US listing. Meanwhile, Elon Musk's SpaceX fell during its first day of trading as part of the Nasdaq 100 index, despite a wave of brokerages initiating coverage on the newly public stock.

Beyond equity markets, oil prices rose following reports of attacks on vessels near the Strait of Hormuz, adding a geopolitical dimension to Tuesday's trading session. Federal Reserve watchers are also awaiting Wednesday's release of the central bank's latest meeting minutes, the first of new Chairman Kevin Warsh's tenure, for additional insight into the policy outlook.

Conclusion

Tuesday's chip-driven selloff highlights growing investor sensitivity to valuation concerns within the AI-related semiconductor sector, even as broader market indices had shown resilience in recent sessions. Whether this represents a temporary rotation following an extended rally, as some strategists suggest, or a more sustained reassessment of AI infrastructure valuations may become clearer as SK Hynix's upcoming listing and Wednesday's Fed minutes provide additional catalysts for market direction.

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