Concentration of AI stocks inside S&P 500 hits dot-com bubble peak – and Bitcoin miners are now exposed

The 10 largest AI stocks now make up about 41% of the S&P 500, according to a BofA Global Research chart circulated online. That puts the AI basket at the same concentration level that tech and telecom reached around the dot-com peak. The BofA chart put the Nifty Fifty at 40% in the 1970s and Japan at 44% in the late 1980s. The comparison turns a stock-market concentration warning into a stress test for a corner …