Hartnett: Today’s "AI Big 10" (Mag 7 plus Broadcom, AMD and Micron) is 41% of US market cap, which is where all previous major bubbles peaked https://t.co/IX7GXnlWO9
Why now
Thesis: AI mega-cap concentration mirrors past bubbles
Catalyst to watch: Rotation out of AI leaders
Main risk: Concentrated unwind hits broad index
Why it matters
Extreme AI concentration echoes prior bubble peaks, raising drawdown risk if sentiment turns.
Details
Hartnett: Today’s "AI Big 10" (Mag 7 plus Broadcom, AMD and Micron) is 41% of US market cap, which is where all previous major bubbles peaked https://t.co/IX7GXnlWO9
Sources
- x · 2026-09-27 02:01 UTC