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S&P 500 concentration risk is surging—the top 10 now make up 41%. See a quant-optimized 15-stock barbell from Strong Buy picks for better diversification.

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Carol M. Kopp edits features on a wide range of subjects for Investopedia, including investing, personal finance, retirement planning, taxes, business management, and career development. Erika Rasure ...

Discover how AI tools like ChatGPT, Claude.ai, Humata, and Excel Copilot help research teams transform raw data into actionable insights and speed up market analysis.