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Jeremy Grantham warned the AI boom has pushed U.S. stocks to a historic valuation peak

The GMO co-founder pointed to a market-cap-to-GDP ratio of 235% and called SpaceX's IPO a potential sign of a market top

Jeremy Grantham warned the AI boom has pushed U.S. stocks to a historic valuation peak

Published June 26, 2026 · Category: Markets

Overview

The GMO co-founder pointed to a market-cap-to-GDP ratio of 235% and called SpaceX's IPO a potential sign of a market top

Source

Originally published at qz.com.

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