Semiconductor Stocks Make Up 15% of U.S. Market Capitalization

Semiconductor stocks account for about 15% of the U.S. stock market by market capitalization, giving the sector a substantial role in overall equity performance and investor exposure.

The sector also represents nearly 12% of market earnings. That share shows the industry’s influence extends beyond its valuation weight and into the profits generated by publicly traded companies.

The semiconductor sector’s market-cap weighting has risen from about 4% in 2023. The figures are dated Oct. 12, 2026, at 11:23 a.m. ET (15:23 UTC).