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%.
https://blossom.prima...
Also if you were to calculate a daily average based on all of the data show (all bubbles... Excess liquidity), it would suggest a major continuation move up.