AI-related stocks now make up 49% of the S&P 500.
That's above the peak of the dot-com bubble (41%) and Japan in 1988 (44%). Only the railroad mania of 1881 went higher, at 63%.

That's above the peak of the dot-com bubble (41%) and Japan in 1988 (44%). Only the railroad mania of 1881 went higher, at 63%.

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