AI chipmakers and infrastructure stocks slide in sharp October sell-off Other

Semiconductor manufacturers, AI cloud infrastructure providers, and hardware suppliers recorded double-digit declines across October as investors repriced capital intensity and timeline expectations for artificial intelligence infrastructure.

The sell-off hit both legacy chipmakers and dedicated AI hyperscalers, with the Philadelphia Semiconductor Index dropping over 20% during the monthly trading period.

What it is

• Broad semiconductor downturn. The Philadelphia Semiconductor Sector Index fell 20.2% over 28 trading days, retreating from previous record highs.
• Hyperscale and cloud pressure. Specialized cloud and infrastructure providers took heavy losses, led by CoreWeave (-37%) and enterprise hardware vendors including Dell (-21%).
• Foundry and memory volatility. Memory manufacturers and legacy foundries suffered steep contractions, with Intel sliding 45%, SanDisk falling 34%, and Micron dropping 17%.
• Megacap hardware resilience. NVIDIA declined 10.4% and AMD dropped 17.5%, proving relatively more resilient than component suppliers despite broader macroeconomic headwinds.
• Investor scrutiny on returns. Market analysts attributed the October correction to concerns over enterprise AI monetization timelines and rising hyperscaler capital expenditures.

Stock performance breakdown

Sources

• Nasdaq Philadelphia Semiconductor Index (SOX)
• TradingView Market Overview