The S&P 500 fell 0.4% on Tuesday as a sharp sell-off in artificial intelligence stocks erased earlier gains, dragging the Nasdaq composite down 1.2%. The pullback came despite stronger-than-expected earnings from Samsung Electronics, signaling that investors are increasingly questioning whether lofty AI valuations can hold up.
The Dow Jones Industrial Average slipped 130 points, or 0.2%, from its record close. Market breadth was mixed: the majority of stocks in the S&P 500 rose, but the index was weighed down by heavy losses in the chip sector. Advanced Micro Devices dropped 6.5%, Intel fell 9.7%, and Micron Technology shed 4.7%.
AI stocks face reality check
Samsung Electronics triggered the slide after reporting a preliminary operating profit surge of roughly 1,800% for the second quarter. Analysts called the numbers strong, but the stock still tumbled 6.9% in Seoul. The reaction reflects a broader concern: AI shares have already priced in years of growth, and even solid results are failing to satisfy investors.
On Wall Street, the same dynamic played out. AI stocks have been under pressure for weeks amid worries that the massive spending on chips and data centers may not deliver enough productivity gains or profits. The recent pullback in AI stocks has raised questions about the sector's valuation, a topic covered in depth through AI for Finance training.
SpaceX, which owns the xAI business, fell 6.8% in its first trading session after joining the Nasdaq 100 index. Rivian Automotive dropped 18.1% after the electric vehicle maker announced it would sell 75 million new shares, diluting existing investors.
Deal activity and biotech moves
Vertex Pharmaceuticals said it agreed to buy Crinetics Pharmaceuticals for $85 per share in cash, pushing Crinetics shares up 98.7%. Vertex fell 1.4% on the news. The acquisition adds a developer of endocrine disease therapies to Vertex's portfolio.
Oil prices and inflation fears resurface
A sharp rise in oil added to the market's unease. The British military reported that three tankers were struck by projectiles in the Strait of Hormuz, and the U.S. later revoked a license that had allowed Iranian oil sales under an interim deal. Brent crude, the international benchmark, rose 3% to settle at $74.16 per barrel.
Higher oil prices put upward pressure on inflation, driving Treasury yields higher. The yield on the 10-year Treasury note climbed to 4.54% from 4.48% late Monday. Yields have been volatile since the conflict with Iran sent oil prices above $100 per barrel in March, stoking fears that the Federal Reserve may need to raise interest rates again to cool inflation.
Global markets feel the drag
South Korea's Kospi index tumbled 4.9%, largely because Samsung Electronics alone accounts for more than a quarter of its weighting. Japan's Nikkei 225 fell 2.1%, and Germany's DAX lost 1.4%.
Why this matters for finance professionals
The selloff in AI names highlights the thin line between earnings growth and overvaluation. With inflation risks tied to energy prices and central bank policy still uncertain, the margin for error in tech investments is shrinking. Executives weighing AI investments face similar pressure to assess long-term returns, a challenge addressed by AI for Executives & Strategy courses. For investors, the key question is whether the productivity gains from AI can justify the capital already deployed - and whether any new geopolitical shock could further unsettle the bond market.
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