The Motley Foolยท2025-11-09 09:06Core Viewpoint - Hedge fund billionaire Michael Burry has made a significant bet against popular AI stocks Palantir and Nvidia, indicating a potential downturn in the AI sector [1][4]. Group 1: Michael Burry's Investment Strategy - Burry's hedge fund, Scion Capital Management, has allocated 66% of its $1.4 billion portfolio to put options on Palantir and 14% to put options on Nvidia, totaling over $1 billion in bets against these stocks [3][4]. - This strategy reflects Burry's historical approach, as he previously profited from a similar strategy during the 2008 financial crisis by betting against subprime mortgage-backed securities [1][2]. Group 2: Performance of AI Stocks - The AI boom, initiated by OpenAI's ChatGPT in November 2022, has led to substantial stock price increases, with Palantir and Nvidia shares rising 2,000% and 1,300%, respectively [5]. - Palantir has gained popularity among retail investors, particularly due to its AI platform launched in April 2023, which has driven nine consecutive quarters of revenue growth [6]. - Nvidia is recognized as a leader in AI infrastructure, holding over 90% market share in data center GPUs and establishing a strong position in generative AI networking equipment [7]. Group 3: Market Context and Comparisons - The S&P 500 has increased by 75% since the launch of ChatGPT, with an annual compounding rate of 20%, drawing parallels to the dot-com bubble [8]. - The S&P 500's cyclically adjusted price-to-earnings (CAPE) ratio reached 39.5 in October, the highest in 25 years, indicating extreme market valuations similar to those seen during the dot-com bubble [10]. - Historical data suggests that the S&P 500 has typically performed poorly following such high CAPE ratios, with an average decline of 30% over three years after surpassing a CAPE of 39 [12].