Grantham Calls US Market the Priciest in American History
Legendary investor Jeremy Grantham warns AI-driven valuations have pushed US stocks to unprecedented expensive territory.
Jeremy Grantham isn't whispering anymore. The GMO co-founder and legendary bear is flat-out calling this the most expensive stock market America has ever seen — and he's pointing directly at AI euphoria as the accelerant.
Valuations tied to artificial intelligence hype have sent prices into the stratosphere, according to Grantham. This isn't your run-of-the-mill overvaluation warning from a perma-bear. This is a guy who called the dot-com bust and the 2008 housing crash telling you the setup right now is worse than anything he's seen before.
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Here's your tradeable reality check: when the smartest long-term value minds in the room start using phrases like "most expensive in American history," that's not background noise — that's a signal worth stress-testing your portfolio against. Stretched AI valuations can unwind fast, and retail traders holding momentum plays need to understand what multiple compression actually feels like on the way down.
Grantham has worn the perma-bear label for years, and markets have punished that caution during prolonged bull runs. But his track record on the biggest bubbles is hard to dismiss. The question isn't whether he's right about the timing — nobody nails that. The question is whether you've sized your risk for a market he's calling historically unprecedented on the expensive side.
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