Ray Dalio said AI enthusiasm has pushed markets into bubble territory reminiscent of 1929 and 2000 during an interview on The Diary of a CEO with Steven Bartlett. He said the market now shows the kind of valuation pressure that can build when stock issuance accelerates.
Dalio said, “He’s right,” in response to Bartlett’s reference to Jeremy Grantham, and added, “There’s almost nothing that’s easier to produce than stock.” He said a company can raise $50 million, get valued at $1 billion, and mint a paper billionaire without a billion dollars ever changing hands.
The Diary of a CEO warning
Dalio identified surging stock issuance as one of the two primary forces that prick a bubble. The other force is not spelled out in the verified facts, but his point is procedural: when new equity can be created quickly and priced aggressively, wealth can rise on paper faster than cash moves in reality.
That concern lands in a market already shaped by AI-linked speculation. The verified facts say Anthropic has confidentially filed for a listing expected as early as October, while OpenAI has filed separately and is targeting a debut that some analysts peg above $1 trillion.
SpaceX, Anthropic, OpenAI
The same fact pattern extends to SpaceX, which went public in June and traded below its IPO price after listing. S&P projected negative free cash flow for SpaceX through 2029, and Moody’s flagged Elon Musk’s concentrated voting power as a governance risk.
Those details give Dalio’s warning a real-time test. When a company can be priced at $1 billion after raising $50 million, and when multiple AI-linked names are being discussed at trillion-dollar levels, the issue is not just enthusiasm; it is how quickly valuation can outrun cash flow and ownership discipline.
Jeremy Grantham’s Bubble Case
Dalio’s warning also tracks with Jeremy Grantham’s earlier calls. Grantham said the day after Chat came out, the Mag Seven lifted the market on its broad shoulders and staggered forward, and he argued that AI did not fix underlying overvaluation but deferred it while making it larger.
Grantham and Edward Chancellor published a January 2026 paper finding price/book ratios and cyclically adjusted earnings multiples at extremes surpassed only in 1929, 1972, 1999-2000, and 2021. Grantham also told Fortune in September 2007 that U.S. housing was in “genuine bubble territory.”
Investors in AI-linked and other high-valuation stocks now have a simple near-term test: whether new listings, rising issuance, and fresh valuations keep outrunning cash generation. If they do, Dalio’s bubble call gains force; if they slow, the market may be absorbing the excess rather than inflating it further.
