The Kobeissi Letter(@KobeissiLetter):BREAKING: The "AI Big 10" now accounts for a record 42% of US stock market cap. This includes Magnificent 7 stocks as well as Broadcom, $AVGO, AMD, $AMD, and Micron, $MU. This figure has more than doubled since the 2022 bear market low. By comparison, during the 2000 Dot-Com Bubble, the Technology, Media & Telecom (TMT) sector peaked at 41%, while the Nifty Fifty peaked at 40% in the 1970s. Furthermore, Japan’s equity market bubble in the 1980s peaked at 44%. In the past, only railroad stocks have significantly exceeded this concentration, accounting for 63% of US market cap at their highest point in the 1900s. The dominance of Big Tech is extraordinary.

2026.10.08 02:43

BREAKING: The "AI Big 10" now accounts for a record 42% of US stock market cap. This includes Magnificent 7 stocks as well as Broadcom, $AVGO, AMD, $AMD, and Micron, $MU. This figure has more than doubled since the 2022 bear market low. By comparison, during the 2000 Dot-Com Bubble, the Technology, Media & Telecom (TMT) sector peaked at 41%, while the Nifty Fifty peaked at 40% in the 1970s. Furthermore, Japan’s equity market bubble in the 1980s peaked at 44%. In the past, only railroad stocks have significantly exceeded this concentration, accounting for 63% of US market cap at their highest point in the 1900s. The dominance of Big Tech is extraordinary.