Top ten US stocks hit record 33 percent market share

Global equity indices are reaching historic concentration levels, with the top 10 United States stocks now accounting for 33% of total market value. Morgan Stanley analysts report this top-heavy structure is even more extreme in Taiwan, where one stock holds a 40% weight. For investors, these benchmarks have become directional bets on artificial intelligence, raising the risk of indiscriminate drawdowns if earnings disappoint.

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