A bubble call from one of the most closely watched figures in finance is likely to sharpen the debate over AI valuations, though Griffin’s framing stops well short of a call to exit. His argument that transformative shifts usually come with a bubble implies volatility and losers along the way, not a collapse in the underlying trend, which may limit any direct market reaction. The timing is notable: his comments arrived alongside SpaceX’s AI revenue beat, Super Micro’s surprise upgrade and Musk’s claim that compute remains scarce, so investors are weighing strong near-term demand against concerns about how much of it is already priced in. That tension may feed the stock-specific volatility analysts expect this earnings season.
Griffin thinks AI is both a bubble and the real thing, which is less a contradiction than a reminder that the dot-com bust still left Amazon standing.
Summary:
- Citadel founder Ken Griffin said investors are almost certainly in an AI bubble
- He argued that any radical transformation of the economy is generally intertwined with a bubble
- Griffin compared the moment to the dot-com era and its fanciful business models, adding he wished he had kept his Amazon shares
- He spoke at the Future of Global Markets Conference in New York on Tuesday
- His views on AI have shifted through 2026, from dismissive at Davos in January to unsettled by its capabilities in May
- The comments came on a day of strong AI demand signals from SpaceX, Super Micro and Elon Musk
Ken Griffin, the billionaire founder of hedge fund Citadel and market maker Citadel Securities, said investors are almost certainly in an artificial intelligence bubble, offering a sceptical counterpoint on a day of strong AI demand signals.
Speaking at the Future of Global Markets Conference in New York on Tuesday, Griffin argued that radical transformations of the economy tend to be tied up with bubbles. He pointed to the period before the dot-com crash, when some business models proved fanciful, but also to the companies that endured, remarking that he wished he had held on to his Amazon shares at the time.
That framing matters. Griffin was not dismissing AI as hype. His argument was that a genuine technological shift and a speculative bubble can coexist, with excess valuations and failed ventures alongside lasting winners.
His remarks mark the latest turn in a shifting stance through 2026. At Davos early in the year, he was openly dismissive of AI. By May, speaking at Stanford’s business school, he said he was unsettled by how much the technology could achieve. His latest comments sit between those positions, accepting AI’s transformative potential while warning that markets have run ahead of it.
The timing gave his view added weight. Earlier in the session, SpaceX reported AI revenue of about $7.6 billion, more than half its quarterly total, and chief executive Elon Musk said compute was so scarce that older Nvidia chips now rent for more than when new. Super Micro Computer separately released a preliminary update showing September-quarter revenue far ahead of its own guidance.
Those data points suggest demand is real and, for now, accelerating. Griffin’s warning is about price rather than demand: whether the valuations attached to AI-linked companies reflect realistic outcomes for all of them.
With mega-cap tech earnings season under way, starting with Meta, investors will be looking for evidence on that question, particularly whether heavy AI spending is beginning to generate returns that support current valuations.
This article was written by Eamonn Sheridan at investinglive.com.