Jeremy Grantham Calls U.S. Market the Priciest in History
Legendary investor Jeremy Grantham warns AI-driven valuations have pushed U.S. stocks to historic extremes. Here's what that means for you.
If you've been feeling like stocks seem a little… pricey lately, you're in good company. Jeremy Grantham — the legendary investor and co-founder of asset management firm GMO — is now saying the U.S. stock market is the most expensive it has ever been in American history. That's a bold claim, and it's not one Grantham makes lightly given his long track record of calling market bubbles.
At the center of this valuation surge, according to Grantham, is the artificial intelligence boom. Excitement around AI has sent certain stocks into the stratosphere, pushing broad market valuations to levels that even surpass the dot-com bubble of the late 1990s — a period Grantham is well known for warning about before it imploded. When someone who called that bubble says things look worse now, it's worth paying attention.
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For everyday investors, this kind of warning can feel paralyzing. Do you sell everything? Stuff cash under the mattress? Not necessarily — but Grantham's concern is a reminder that markets priced for perfection tend to punish investors harshly when reality doesn't cooperate. Stretched valuations don't mean a crash is imminent, but they do suggest that future returns from current price levels could be disappointingly slim.
Grantham has worn the bear label for a while now, and critics will point out that being early with a warning is essentially the same as being wrong — until it isn't. Still, the core argument is straightforward: when investors collectively agree that a transformative technology justifies almost any price, history suggests some of that enthusiasm is borrowed from future returns rather than grounded in present fundamentals.
Whether AI ultimately delivers on its enormous promise or not, the valuation math deserves a hard look before you pile in. Continue reading at US Top News and Analysis.
