U.S. stock market now runs on silicon, about 15% of it, anyway

Oct 12, 2026
us.-stock-market-now-runs-on-silicon,-about-15%-of-it,-anyway
Oct 12, 2026, 11:23 AM ETPhiladelphia Semiconductor Index (SOX), , , , , , , , , By: Sinchita Mitra, SA News Editor
Microprocessors on a dark background

Andrei Berezovskii/iStock Editorial via Getty Images

Semiconductor stocks make up about 15% of the U.S. stock market, while the sector’s share of market earnings has climbed to nearly 12%, according to data posted by Hedgeye.

The sector’s market-cap weighting rose from around 4% in 2023 to nearly

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