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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.
Published September 21, 2026Data through June 30, 2025Recommended height 520px
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<iframe src="https://grizzlybulls.com/embed/research/sp500-concentration-history?theme=auto" title="S&P 500 top-10 concentration at seven decade endpoints" loading="lazy" referrerpolicy="strict-origin-when-cross-origin" style="width:100%;height:520px;border:0;overflow:hidden"></iframe>
Research source
38.15% top-10 index weight. June 2025, versus 38.24% in June 1965.
The widget is a distribution view of S&P 500 Concentration History: How the Top 10 Changed From 1965 to 2025. Use the full study for methodology, evidence, and limitations.
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