The S&P 500 fell 1.1% and the Nasdaq composite dropped 1.9% on October 14, 2026, their worst session since July. Inflation served as the trigger with a September CPI reading that came in hotter than expected at 3.7% year-over-year versus 3.6% consensus, reviving fears of another Federal Reserve rate hike. AI infrastructure stocks bore the brunt of the selloff: AMD lost 6.1%, Nvidia and Broadcom each fell 3.7%, and CoreWeave plunged as much as 15.9%. Rising Treasury yields added pressure by making borrowing more expensive for companies investing heavily in data centers and chips. This setback highlights how rate-sensitive AI valuations have become and how tightly the sector is now linked to macroeconomic data.
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