‘AI Big 10’ is claimed to hold a record 42% of US stock market cap

A market commentary post claims the ‘AI Big 10’—the Magnificent 7 plus Broadcom, AMD and Micron—accounts for a record 42% of US stock market cap, more than double its share at the 2022 bear-market low. It compares that figure with a 41% peak for technology, media and telecom stocks during the dot-com bubble and a 44% peak for Japan’s equity market in the 1980s.