Stats › Concentration and breadth › Equal weight

Same 500 companies, -9% or +64% across the 2000s

2000s cap: -9%-9%2000scap2000s equal: 64%+64%2000sequal1H26 cap: 10.2%+10.2%1H26cap1H26 equal: 12.1%+12.1%1H26equal

Left pair is the 2000 to 2009 decade. Right pair is the first half of 2026. Sources: AMG Wealth and First Trust.

The equal weighted S&P 500 holds the same five hundred American companies as the usual version, in identical amounts rather than by size. Across the 2000s one returned minus nine percent and the other plus sixty four. Position sizing alone produced that gap.

-9%2000s, cap weighted
+64.0%2000s, equal weighted
38.5%Top ten, cap weighted
about 2%Top ten, equal weighted

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