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Large-cap U.S. stock gains bring the diversification case into sharp focus

8/22/2026

stocks have delivered well for investors holding low-cost S&P 500 index funds, a vehicle that serves as the foundation of many wealth-building portfolios.

Experts are signaling caution: adding different assets to lower volatility is the step that a concentrated large-cap position currently skips, and staying greedy with a position that has already worked carries its own cost.

Low-cost S&P 500 index funds capture broad exposure to large-cap U.S. equities at minimal cost, compounding over time in a way that supports long-term wealth growth.

What is in focus is the asymmetry that builds when the biggest U.S. A portfolio anchored heavily in those names captures the upside when they lead. It captures a disproportionate share of the drawdown when they do not.

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