Chip stocks now make up 14% of U.S. market cap, twice the dot-com peak
As seen on the 24/7 Wall St. homepage on October 26, 2026.
Anyone holding a plain index fund now owns twice the semiconductor exposure that dot-com era investors did at the top, so a chip spending slowdown hits the whole portfolio.
Chip stocks are about 14% of U.S. market cap, double their 2000 peak of about 7% https://t.co/HWjgSAGiR9
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Semiconductor stocks now represent roughly 14% of total U.S. market capitalization, double the share they held at the height of the dot-com bubble in 2000. That 2000 peak is remembered as extreme concentration in a single technology theme, and chips have surpassed it by a wide margin.
For anyone holding a broad index fund, that concentration is already built into the portfolio whether they chose it or not. A slowdown in chip spending, a demand warning from a major manufacturer, or a supply glut moves the whole index.
The 2000 parallel is a reference point for scale. Investors who thought they were diversified through plain index ownership at the dot-com peak discovered that a single sector's unraveling could drag the broader market sharply lower.
Keep an eye on how durable the demand driving that weight actually is. If capital spending on artificial intelligence infrastructure holds, the concentration is justified by earnings. If it softens, index exposure amplifies any drawdown.