LIVEMarkets rolling coverageStarted: August 11, 2026, 4:00 AM EDTUpdated: August 11, 2026, 7:47 AM EDT Unusual Stock Signal Draws Dot-Com Bubble Comparisons August 11, 2026, 7:44 AM EDT. The S&P 500, Nasdaq Composite, and Dow Jones have each climbed between 5% and 9% since late July. The S&P 500 Shiller CAPE ratio has stayed above 40 since May, a mark reached just twice before, including leading up to the 2000 dot-com collapse, highlighting expensive valuations. Tech sector concentration is increasing, with chip stocks taking up 14% of the S&P 500, adding to risks as markets face uncertain economic indicators. The