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AI Stock Selloff Pulls Wall Street to Third Straight Loss as Valuation Fears Mount

Markets1 source·Aug 18

Summary

  • • AI stocks led Wall Street lower Tuesday, with Micron falling 7%, Nvidia 2.3%, and Broadcom 3.2%.
  • • S&P 500 fell 0.7% and Nasdaq sank 1.3%, marking a third consecutive loss since last week's all-time high.
  • • Investors worry AI valuations overshot and data-center demand may fizzle if AI proves less profitable than promised.
  • • High Treasury yields at 4.70% and oil near $91/barrel are compounding pressure on growth stocks.
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Details

Market Impact

S&P 500 fell 0.7% to 7,691 for third straight loss

The S&P 500 declined 53.30 points to 7,691.76, its third straight modest loss since setting an all-time high the prior Thursday.

Market Impact

Nasdaq sank 1.3% led by AI and chip stocks

The Nasdaq composite fell 355.20 points to 26,289.71, led lower by AI and semiconductor stocks.

Market Impact

Micron Technology dropped 7%, heaviest S&P drag

Micron Technology was among the heaviest weights on the S&P 500, falling 7% amid concerns about sustainability of memory demand from AI data centers.

Market Impact

Nvidia fell 2.3% and Broadcom fell 3.2%

Nvidia fell 2.3% and Broadcom sank 3.2%, continuing a pattern of volatility in AI chip stocks driven by valuation concerns.

Context

AI profitability doubts are driving the volatility

Investors worry AI stocks shot too high during the AI frenzy, and that demand for memory, processors, and data center components may fizzle if AI proves less profitable than expected.

Context

10-year Treasury yield held elevated at 4.70%

The 10-year Treasury yield held at 4.70%, well above its pre-Iran-conflict level of 3.97%, making expensive growth stocks less attractive relative to bonds.

Context

Oil at $91/barrel keeping inflation and yields high

Brent crude at $91.02/barrel — up from $72.87 before the Iran conflict — is pushing inflation expectations higher and keeping bond yields elevated globally.

Market Impact

Klarna sank 22.8% after cutting its 2026 forecasts

Buy-now-pay-later firm Klarna dropped 22.8% despite beating earnings estimates after cutting 2026 financial forecasts, citing weakness in Germany, its largest market by volume.

Market Impact

Meta fell 4.4% as social media harms trial opened

Meta Platforms dropped 4.4% as opening statements began in a California federal trial where states seek billions in damages for alleged social media harms to children.

Insight

AI stocks remain big year-to-date winners despite dip

Despite recent volatility, AI stocks remain major 2026 outperformers; Micron has more than tripled year-to-date, suggesting a correction rather than a collapse in the AI investment thesis.

Rows 1–4: index and stock moves; Rows 5–7: macro context; Rows 8–9: other notable movers; Row 10: broader perspective.

What This Means

Tuesday's AI stock selloff reflects a deepening investor debate over whether massive AI infrastructure spending will translate to proportional revenue — a question making high-valued AI stocks especially sensitive to macro headwinds. With the S&P 500 logging a third straight loss after an all-time high, markets are entering a more cautious phase where proof of AI profitability is increasingly demanded. Elevated bond yields and oil prices add macro pressure that disproportionately hurts premium-priced growth sectors, but the strong year-to-date gains for stocks like Micron suggest this is a recalibration rather than a crisis of confidence in AI's long-term trajectory.

Sources

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