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AI infrastructure stocks Coherent, Ciena, and Teradyne drop 10%+ amid sector rotation and valuation concerns

Market News
18 Aug 2026
24/7 Wall Street
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Bearish
pluang ai news

Shares of AI infrastructure leaders Coherent, Ciena, and Teradyne fell sharply by around 10% or more, leading the S&P 500 lower on Tuesday. The sell-off reflects a rotation out of semiconductor and AI hardware stocks amid concerns over high valuations and off-balance-sheet AI commitments totaling trillions. Despite strong recent earnings and massive year-to-date gains, these stocks are vulnerable to sharp declines on risk-off days due to their stretched valuations. Analysts remain generally bullish, but investors are cautious as the 30-year Treasury yield hits a 19-year high, pressuring growth stock valuations. Long-term AI growth prospects remain intact despite short-term volatility.

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