Michael Burry, the contrarian investor renowned for foreseeing the 2008 subprime mortgage crisis and profitably betting against it, has delivered a sobering message to investors amid the ongoing surge in technology and artificial intelligence stocks. He warned that the market has entered historically perilous territory marked by speculative excess, and it is time to reduce risk.
In a recent Substack post, Burry advised investors to “reject greed” as relentless enthusiasm around AI and momentum-driven trading propels valuations to unsustainable levels. He highlighted the detachment of stock prices from traditional economic indicators.
“An easier way for most is to simply reduce exposure to stocks, to tech stocks in particular. For any stocks going parabolic reduce positions almost entirely,” Burry wrote.
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His latest comments build on months of cautionary notes. Burry has repeatedly likened the current environment to the final, euphoric phase of the late 1990s dot-com bubble. Last week, he specifically compared the trajectory of the Philadelphia Semiconductor Index (SOX), which has skyrocketed roughly 148% over the past year and shown parabolic gains in 2026, to the unsustainable run-up before the March 2000 tech collapse.
“Feeling like the last months of the 1999-2000 bubble,” he observed, noting that stocks are moving independently of fundamentals such as jobs data or consumer sentiment.
Burry’s concerns come as major U.S. indexes continue setting records. The S&P 500 has climbed approximately 8% in 2026, while the Nasdaq has advanced around 13%, with gains heavily concentrated in a small group of AI-related megacap and semiconductor names. AI stocks now account for a record share of the S&P 500’s market capitalization, and an S&P 500 ex-AI version of the index has remained essentially flat since February, underscoring the narrow breadth of the rally.
Semiconductor leaders like Nvidia, Broadcom, AMD, Micron, and others have powered much of the advance, fueled by massive corporate spending on AI infrastructure and data centers. Yet Burry argues this fixation, “Absolutely non-stop AI. Nobody is talking about anything else all day”, mirrors the narrative-driven mania of the dot-com era, where “internet” became a two-letter thesis that everyone claimed to understand.
Burry disclosed that he maintains “a significant leveraged short position” against a basket of companies he views as depressed and undervalued, echoing tactics he used successfully around the 2000 peak. He has held bearish bets on names like Nvidia and Palantir in the past, though some of those positions have faced challenges amid the rally’s persistence.
Despite his own positioning, he strongly discourages most investors from attempting to fight the trend through short selling or options.
“Shorting is not the answer. It is not something most people should ever do,” Burry emphasized. “Right now it is expensive, in general, to buy put options and directly shorting stocks can still cause significant pain.”
His recommended course is simpler and more defensive: raise cash and prepare for better opportunities ahead.
“The idea is to raise cash, and prepare to put it to work when it makes more sense to do so,” he wrote. “History tells us that even if the party goes on for another week, month, three months or year, the resolution will be to much lower prices.”
Burry’s warnings tap into a growing divide on Wall Street. Bulls point to tangible progress in AI, real revenue growth, productivity potential, and strong balance sheets at leading tech firms as differentiators from the unprofitable dot-com era. Skeptics, including Burry, highlight extreme valuations, concentration risk, soaring implied multiples, and the potential for disappointment if AI monetization lags behind hype and capital expenditure.
The SOX index’s extraordinary gains, frequent record streaks, and premium to long-term averages have drawn particular scrutiny as classic bubble indicators. Burry has even taken fresh put options on semiconductor ETFs to express his view that the sector “will return to earth.”
Burry’s message is reminding individual investors of market cycles: euphoria eventually gives way to reality, often with painful drawdowns. While timing remains notoriously difficult, his track record of identifying major excesses lends credibility to the call for prudence.
As geopolitical risks (including the Middle East conflict) persist and economic data send mixed signals, the disconnect between AI optimism and broader fundamentals may prove increasingly difficult to sustain.
One of the defining investment debates of 2026 remains whether the current rally represents sustainable technological transformation or late-stage speculative froth. But Burry has placed his bet firmly on the latter — and urged others to protect themselves accordingly.