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Jeremy Grantham Calls U.S. Stocks 'The Most Expensive Market in American History'

6/27/2026

Jeremy Grantham is warning that soaring artificial intelligence valuations have pushed the U.S. stock market to its most expensive level in American history.

The assessment places AI-driven enthusiasm at the center of what he describes as a historically extreme stretch in prices across U.S.

A Price Warning, Not a Technology Verdict Grantham's argument is about valuation, not about whether artificial intelligence will ultimately deliver. Soaring AI-related prices have, in his view, carried the entire U.S.

market to a level he describes as the most expensive it has ever been — a claim that sets current conditions above every prior historical peak.

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