Grantham Calls US Market Priciest in American History
Legendary investor Jeremy Grantham warns AI-fueled valuations have pushed US stocks to historic extremes. Here's what that means for your portfolio.
Jeremy Grantham isn't whispering anymore. The legendary bubble-spotter is flat-out saying the US stock market is the most expensive it has ever been in American history — and he's pointing his finger squarely at artificial intelligence euphoria as the driver.
Grantham has been right before. He called the dot-com bust, the 2008 housing crash, and the 2022 selloff. When this guy talks about stretched valuations, you don't scroll past. His argument is straightforward: AI hype has inflated stock prices to levels that dwarf even the most notorious bubbles in US market history.
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For retail traders, this is the kind of signal that demands attention. Historically expensive markets don't mean an immediate crash — timing a bubble is notoriously brutal. But it does mean the margin for error is razor-thin. Buying momentum here carries asymmetric risk: the upside is limited by already-elevated prices, while the downside in a mean-reversion scenario could be brutal.
The smart play isn't panic-selling everything. It's reassessing your risk exposure right now. Are you overweight US large-cap tech? Are you holding names that only make sense if AI delivers every promise it's ever made? Grantham's warning is a gut-check, not necessarily an exit signal — but ignoring it entirely would be a mistake.
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