8legs: Royal bank of canada

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Wall Street Is Flashing a Warning Signal Investors Shouldn't Ignore

A Royal Bank of Canada analysis finds the S&P 500 has become tech- and AI‑dominated, reducing traditional diversification.
Top 10 stocks now make up a much larger share of the index, increasing concentration risks for investors.
Nvidia, a key AI stock, now accounts for about 8% of the S&P 500's value, highlighting concentration.
The RBC analysis suggests passive flows can disproportionately support the largest stocks, reinforcing leadership regardless of fundamentals.
The Motley Fool highlights that Stock Advisor's top 10 stocks could outperform the S&P 500 over time.
Historical context shows concentration rose from roughly 18% in early years to over 40% of index value today.
The RBC report cautions investors not to assume index funds fully diversify away risk.
The article links to ongoing market data, including futures for major indices and notable stocks.
The report frames diversification as achievable but not as broad as in the past.
The piece emphasizes reassessing portfolio diversification in light of rising concentration.

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