The S&P 500 fell 4.36 percent while the equal-weight version fell only 1.1 percent. That gap shows the decline was concentrated in the largest companies. When market-cap weighting pulls the index lower, products that track the standard index experience larger drawdowns than an equal allocation across all members would produce. Investors holding broad index funds therefore absorb more of the volatility tied to those few names than the equal-weight numbers alone would indicate.
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