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US stock market hits 40-year concentration high; small caps fall sharply but may rebound.

Market News
12 Nov 2026, 06:45 WIB
Seeking Alpha
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Neutral
US stock market hits 40-year concentration high; small caps fall sharply but may rebound.

The US stock market is at its most concentrated level in 40 years, with the top 30 stocks representing about 50% of market capitalization by Q3 2026. Small-cap stocks fell 8.8% in Q3, marking their third-worst quarter in five decades, but historically such declines have been followed by strong rebounds. The biggest S&P 500 companies now dwarf the entire Russell 2000, with valuation gaps at record levels, suggesting potential opportunities in undervalued small-cap and value stocks. Experts see this concentration and valuation disparity as conditions that often precede broader market leadership and value cycles, indicating possible future gains outside mega-cap tech and AI leaders.

Market concentration at a 40-year high is the subject, with Pluang data providing context as of Nov 12, 2026 11:01 WIB. Of 150 priced US stocks tradable on Pluang, 96 rose and 53 fell today. Notable movers include Nvidia Corp (NVDA) at USD 161.23 with a 1-day change of -4.48% and a typical hold time of 118 days, FuelCell Energy Inc (FCEL) at USD 10.74 up 4.47%, and Sea Limited (SE) at USD 73.69 down 4.05%. The most notable figure is NVDA's 69% buy order activity on Pluang.

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