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Grantham warns AI-driven rally makes market historically expensive, signaling risk

Jun 26, 2026, 10:21 AM EDT1 sourcesAI-analyzed

Why it may matterVerify against the original reporting

Extreme overvaluation metrics (Buffett indicator ~235% GDP) and frothy IPO/valuation signals (SpaceX) heighten risk of a drawdown; historically, peaks followed by corrections, reducing investor appetite for riskier SPACs.

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Veteran investor Jeremy Grantham argues the AI-driven rally has pushed U.S. stocks to a record-high valuation relative to GDP, around 235% per Longtermtrends data. He warned that the market could peak and head lower, citing the dot-com-era crash as a possible analog. SpaceX’s reported $2 trillion valuation is used to illustrate froth, while the broader implication for P-SPACs is tighter funding and discounting of lofty deal values.

Grantham: AI boom makes U.S. market historically expensive.
Buffett indicator near 235% of GDP; overvaluation risk.
SpaceX valuation cited around $2 trillion amid frothy sentiment.
Amazon dot-com crash example cited; potential peak and downturn.

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