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S&P 500 top-10 concentration at seven decade endpoints
Reconstructed decade endpoints from June 1965 through June 2025.
Published September 21, 2026Data through June 30, 2025Percent of S&P 500Source study v1.0
Figure provenance
- Research data date
- June 30, 2025
- Primary evidence
- S&P Dow Jones Indices, In the Shadows of Giants
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Use this when the chart or its underlying finding appears in editorial coverage, research, or analysis.
Lee Bailey. “S&P 500 top-10 concentration at seven decade endpoints.” Figure from S&P 500 Concentration History: How the Top 10 Changed From 1965 to 2025. Grizzly Bulls, September 21, 2026. Data snapshot June 30, 2025. https://grizzlybulls.com/research/figures/sp500-top-ten-concentration-history-figure
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<figure>
<a href="https://grizzlybulls.com/research/figures/sp500-top-ten-concentration-history-figure" rel="nofollow">
<img src="https://grizzlybulls.com/research/figures/sp500-top-ten-concentration-history-figure.svg" alt="Line chart of S&P 500 top-10 concentration falling from 38.24% in June 1965 to a low of 17.67% in June 1995, then rising to 38.15% in June 2025." loading="lazy" />
</a>
<figcaption>Source: <a href="https://grizzlybulls.com/research/historical-sp500-concentration" rel="nofollow">Grizzly Bulls Research</a></figcaption>
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