Analysts Warn AI Stock Boom Has Entered Late-Stage Bubble

Market analysts warn that the AI-led stock market boom has entered a late-stage bubble and is poised for a significant crash. James Reilly of Capital Economics forecasts that while the S&P 500 may end 2026 at 8,250, it could plunge 21% to 6,500 by the end of 2027. He cites extreme market-cap concentration, booming equity issuance, and unsustainable earnings growth as primary indicators of the bubble.

Other financial leaders highlight macroeconomic triggers that could accelerate a downturn. Ruchir Sharma of Rockefeller International warns that a decisive breach of 5% in the 10-year Treasury yield would signal a new era of tight money. Such a shift would increase the burden of U.S. national debt and make the funding of AI mega-projects more difficult.

Even typically bullish analysts have tempered their expectations. Ed Yardeni increased the probability of a bearish outcome for the remainder of the decade to 30%, citing unnerving developments in the bond and oil markets.