Economist Steve Hanke warned on Monday that the increasing concentration of semiconductor stocks in U.S. equity markets does not indicate a real bull market. Hanke responded to data showing semiconductors account for roughly 15% of U.S. equity-market value. Hanke wrote, "This high concentration is not the stuff that makes for a real bull market. BEWARE."
The chart Hanke shared shows semiconductor market-cap weight rising from about 4% in 2023 to around 15%. The chart shows the semiconductor industry's share of market earnings climbing toward 12%. The gap has widened sharply during the artificial-intelligence infrastructure boom. Demand for accelerators, memory and networking chips has lifted companies across the semiconductor supply chain.
Nasdaq Dorsey Wright research shows semiconductors rising from 5.05% of the S&P 500 in 2022 to 16.67% by early 2026. The research shows semiconductors becoming larger than every broad sector except technology. Semiconductors also represented nearly half of the technology sector. Hanke previously declared "WELCOME TO THE AI BUBBLE" while criticizing circular financing around major chip investments.
The S&P 500 has gained about 14% in 2026 as of Monday, although more than 40% of the index's constituents are down this year. Technology alone contributed more than 10 percentage points of the index's gain. Fewer than half of S&P 500 members traded above their 200-day moving averages. More than half of Nasdaq 100 constituents recently traded below their 50-day averages despite record index levels.
Market strategists see concentration as a vulnerability, though not necessarily evidence of a bubble. Miller Tabak strategist Matthew Maley said in June that the indexes will decline if the small group of leading technology stocks declines. Schwab's Liz Ann Sonders said an overarching AI theme clearly explains what is performing well.
However, Bespoke Investment Group said today's technology dominance looks much more sustainable than the dot-com peak because profits are substantially stronger. Bank of America's Vivek Arya has similarly argued that earnings, rather than pure speculation, continue to drive the semiconductor rally. The U.S. benchmark Philadelphia Semiconductor Index fell 2.7% on Monday, showing how quickly sentiment can shift. The iShares Semiconductor ETF (NASDAQ:SOXX) tracks the index.
Top Economist Warns High Concentration of Semiconductor Stocks Isn't a Real Bull Market
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Summary
Top Economist Warns High Concentration of Semiconductor Stocks Isn't a Real Bull Market. Steve Hanke noted semiconductors now make up 15% of U.S. equity value, up from 4% in 2023. AI demand boosted their earnings share to 12%. Nasdaq Dorsey Wright data shows their S&P 500 weight rose to 16.67% by early 2026. Analysts say earnings—not speculation—fuel the rise. Meanwhile, top altcoins remain under pressure in the crypto market.
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