Semiconductor stocks now account for nearly 15% of U.S. market
The semiconductor sector has expanded its share of U.S. market capitalization and earnings as investment in AI infrastructure accelerates.
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what happened
Semiconductor companies now represent about 15% of the U.S. stock market, while their portion of total market earnings has risen to nearly 12%, according to data posted by Hedgeye and reported by Seeking Alpha. The sector’s market-cap share increased from around 4% in 2023 to nearly 15% in 2026, while its earnings share climbed from roughly 3% to close to 12%.
Around the dot-com boom in 2000, semiconductors accounted for about 7% of market capitalization and roughly 4% to 5% of market earnings. Both measures later fell before surging again in recent years. The latest increase has accompanied a boom in spending on artificial-intelligence infrastructure, boosting demand for advanced chips and earnings at companies that supply processors for AI computing.
why it matters
The figures highlight the semiconductor sector’s growing weight in both the valuation and earnings structure of the U.S. market. Seeking Alpha states that its content is for informational purposes only and does not constitute personal investment advice.
instruments
sources
- U.S. stock market now runs on silicon, about 15% of it, anyway — seekingalpha.com, 12 October 2026 at 15:23 UTC
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