Investor Michael Burry Warns of Tech Bubble While Valuation Gaps Suggest Bull Market Still Holds

Michael Burry, whose reputation was built on betting against the subprime mortgage market, has once again turned his attention to equity valuations. In a recent Substack post he argued that the rapid climb in technology and semiconductor shares mirrors conditions that preceded the collapse of the late‑1990s internet bubble. He highlighted that several Nasdaq‑100 constituents have posted percentage gains comparable to those seen during the dot‑com era, suggesting that investor enthusiasm for artificial intelligence (AI) and related hardware may be reaching unsustainable levels.

Burry’s warning arrives at a time when the S&P 500 has been driven higher largely by a handful of AI‑focused megacompany stocks. Companies such as Nvidia, Microsoft, Meta, Amazon and Broadcom have commanded valuation premiums that dwarf those of the broader index. The investor disclosed that he has taken sizable short positions on high‑momentum tech names and urged market participants to trim exposure to stocks whose price appreciation is largely powered by speculative sentiment rather than fundamentals.

While Burry’s perspective resonates with many value‑oriented analysts, another voice in the market – Giuseppe Sette, co‑founder of Reflexivity – points to a different indicator. He tracks the spread between the average price‑to‑earnings (P/E) ratio of the 100 largest S&P 500 constituents and that of the next 100 firms. Historically, widening spreads have coincided with periods when large caps lead market gains, reinforcing investor confidence in those companies’ earnings prospects. The current data shows a pronounced premium for the top tier, implying that investors continue to reward the dominant AI players with higher multiples.

The implication for portfolio construction is twofold. First, exposure to mega‑caps like Amazon (AMZN) remains a key driver of performance for broad market ETFs such as SPY and VOO. Amazon’s stock sits near its 52‑week high at $270.64, up roughly 17% year‑to‑date, and still trades above both its 50‑day and 200‑day moving averages, indicating technical strength. However, the relative volume of about 1.3 times average suggests heightened trading interest that could amplify price swings.

Second, investors should monitor whether the valuation gap between large and mid‑cap stocks begins to compress. A narrowing spread would signal that market leadership is weakening, potentially exposing the rally to macro‑driven headwinds such as geopolitical tensions or inflationary pressures. Conversely, if the premium persists, it may support continued upside for AI leaders while leaving room for selective short positions on overextended names.

From a risk‑management standpoint, Burry’s cautionary stance underscores the importance of diversification and position sizing. The consensus price target for Amazon stands at $306.77, implying roughly 13% upside from current levels. Yet the stock’s relative strength index (RSI) sits near 48, indicating neither overbought nor oversold conditions, and its volatility over the past 20 days remains elevated at about 21%. Investors should weigh these metrics against their tolerance for sector concentration risk.

In summary, while Burry’s historical track record lends weight to his bearish outlook on the tech surge, the “valuation premium” indicator suggests that as long as investors continue to assign higher multiples to AI‑driven megacaps, the broader bull market may retain momentum. Market participants would do well to balance vigilance for a potential bubble burst with an appreciation of the structural earnings growth embedded in today’s leading technology firms.