Michael Burry, the investor who famously predicted the U.S. housing crash and was immortalized in the film "The Big Short," is sounding a public alarm about the current state of the stock market, comparing the AI-driven rally to the final stages of the dot-com bubble that collapsed in early 2000.
Burry made the warning in a Substack post published Friday, written after he spent a long drive listening to financial television and radio coverage. "Absolutely non-stop AI. Nobody is talking about anything else all day," he wrote, describing the media environment as a signal of dangerous market groupthink.
His central concern is that stocks have become detached from underlying economic fundamentals. The S&P 500 climbed to a fresh record high Friday after traders focused on a slightly better-than-expected April jobs report, even as consumer sentiment fell to a record low. Burry dismissed the logic. "Stocks are not up or down because of jobs or consumer sentiment," he wrote. "They are going straight up because they have been going straight up. On a two letter thesis that everyone thinks they understand. ... Feeling like the last months of the 1999-2000 bubble."
The "two letter thesis" he referenced is AI. Over the past two years, investors have poured money into AI-linked shares, driving semiconductor companies and megacap technology firms to repeated record valuations. The enthusiasm has been broad and consistent, lifting major U.S. equity indexes to highs that many analysts have struggled to justify on earnings alone.
Burry specifically pointed to the Philadelphia Semiconductor Index, known as the SOX, drawing a direct comparison between its recent trajectory and the run-up that preceded the dot-com collapse. The index gained more than 10% in a single week, pushing its total 2026 gains to 65%. The last time a comparable surge occurred in semiconductor stocks, the broader technology sector peaked in March 2000 and then fell sharply over the following two years, erasing trillions in market value.
Burry is not alone in his concern, though others are less certain about the timing. Hedge fund manager Paul Tudor Jones told CNBC's "Squawk Box" this week that the current environment feels similar to 1999, roughly a year before technology shares peaked. But Jones stopped short of predicting an imminent collapse, estimating the rally could run for another year or two. He was more specific about what the aftermath might look like. "Just imagine the stock market went up another 40%," Jones said. "The stock market GDP is going to probably be good lord 300%, 350%. You just know that there'll be some ... breathtaking kind of corrections."
The divergence between Burry and Jones reflects a broader uncertainty gripping market analysts: whether the AI investment cycle represents a genuine transformation in corporate productivity and earnings, or whether valuations have simply outrun reality on speculative enthusiasm. For now, the rally continues, with generative AI applications, data center buildouts, and chip demand all cited by bulls as reasons the comparison to 1999 is imperfect.
What is harder to dispute is the scale of the move. A 65% gain in a major sector index within a single calendar year is historically rare. The last time it happened, the correction that followed took the Nasdaq more than a decade to recover from in inflation-adjusted terms. Burry, who was one of the few investors to publicly and profitably bet against the housing market before 2008, has a track record of being early and, eventually, right. Whether this warning lands in the same category remains to be seen, but the Substack post drew immediate attention across financial media Friday.
