S&P 500 top-10 concentration at seven decade endpoints
Embed the seven reproducible S&P 500 top-10 concentration decade endpoints from 1965 through 2025.
38.15% top-10 index weight. June 2025, versus 38.24% in June 1965.
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Embed the seven reproducible S&P 500 top-10 concentration decade endpoints from 1965 through 2025.
38.15% top-10 index weight. June 2025, versus 38.24% in June 1965.
Preview & embedEmbed the top-10 share of S&P 500 market capitalization versus trailing earnings for March 2024 and March 2026.
4.7 pp market-cap minus earnings gap. March 2026: 37.9% of market cap versus 33.2% of trailing earnings.
Preview & embedEmbed the top-10, remaining-company, and full-index forward-P/E comparison for March 2024 and June 2026.
2.0x top-10 forward-P/E spread. June 2026: 21.6x for the top 10 versus 19.6x for the remaining companies.
Preview & embedEmbed the six historical starting-concentration observations and their subsequent 10-year annualized S&P 500 price returns.
-0.04 correlation excluding June 1965. The full six-observation sample is -0.72, showing the relationship is highly sensitive to one starting point.
Preview & embedA compact four-part view of top-10 index weight, earnings support, valuation spread, and forward-return sensitivity.
4 dimensions one concentration research series. Historical weight, earnings support, valuation, and forward-return sensitivity retain separate dates and denominators.
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