Legendary investor Jeremy Grantham, who successfully predicted the dot-com bubble in 2000 and the financial crisis in 2008, recently said he is actively selling U.S. stocks and warned that the current market valuations are at historical bubble levels, with AI at the core. The 87-year-old Grantham, who once managed $165 billion in assets, said that current U.S. stock market valuations have surpassed those of the dot-com era in 2000. He predicts that when the bubble bursts—which could happen in days, months, or years—some stocks could fall as much as 70%, similar to the Nasdaq's collapse of over 80% at that time.