Are stocks getting frothy? AI-fueled highs stoke bubble talk on Wall Street

Wall Street’s AI sugar rush has pushed the S&P 500 and Nasdaq to fresh records, and now the hangover fears are kicking in. A blistering rally — powered by enthusiasm for artificial intelligence and mega-cap tech names — has valuations looking stretched, prompting louder warnings that a shakeout could be coming.

The bull case is obvious: optimism around AI has supercharged the market’s biggest players and helped lift the S&P 500 and Nasdaq to new peaks this year. But that momentum has also drawn the attention of risk cops. IMF chief Kristalina Georgieva cautioned that lofty equity prices raise the odds of a painful correction that could spill into the global economy. JPMorgan’s Jamie Dimon echoed the concern, saying the chance of a “meaningful” drop in US stocks over the next 6–24 months is higher than investors seem to think.

Not everyone sees a bubble. Goldman Sachs argues this isn’t a dot-com rerun: today’s rally, they say, is anchored more in fundamental earnings growth than in wild speculation, with AI’s early spoils concentrated among profitable incumbents. Even so, Goldman flags two pressure points — sky-high market concentration and intensifying AI competition — and urges investors to stay diversified.

Bottom line: AI excitement has been a powerful tailwind, but with indexes at all-time highs and caution lights flashing from the IMF and the Street’s biggest bank, the margin for error is shrinking. This doesn’t scream “bursting bubble” yet — but it does argue for seatbelts and a broader portfolio.

Reuters, CNN, Axios contributed to this report.