US Stocks Fall as Alphabet Drop Revives AI Concerns

US stock indices declined on Thursday as a record drop in Alphabet shares following earnings reports revived investor concerns over heavy artificial intelligence spending. Communication services fell sharply while broader markets digested mixed economic data and Federal Reserve policy updates.

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Traders work, as screens broadcast a news conference by US Federal Reserve Chair Kevin Warsh following the Fed rate announcement, on the floor of the New York Stock Exchange (NYSE) in New York City, US, October 28, 2026. REUTERS/Jeenah Moon

The major United States stock indices fell Thursday despite economic growth data, driven by a record drop in Alphabet Inc. Class A shares. The sell-off outpaced gains in healthcare stocks and lower bond yields. The decline revived investor anxiety over the soaring costs of artificial intelligence infrastructure.