Mainland Chinese stocks have shed approximately $2.4 trillion in market value since May, driven by investor skepticism regarding the profitability of Beijing’s artificial intelligence sector. The CSI 300 index entered a bear market on October 22 after falling more than 20% from its peak, while the STAR 50 index, which tracks major tech and chip companies, declined 40% in under four months, erasing about $480 billion. According to Goldman Sachs, AI firms now account for 42% of the market value of Chinese shares listed on the mainland and in Hong Kong, and represent 57% of trading volume, meaning declines in this sector disproportionately impact the broader market.
The valuation correction has been severe; the STAR 50 trades at roughly 100 times earnings, down from nearly 250 at its peak, compared to the Nasdaq 100’s ratio of around 30. This downturn follows high-profile volatility, including Nvidia losing nearly $600 billion in market value in a single day after DeepSeek released a cost-effective chatbot in January 2025, and further drops in July triggered by Moonshot AI’s Kimi K3 model. In response, Beijing reportedly instructed tech giants like ByteDance and Alibaba to cease purchasing Nvidia chips in September 2025, pushing toward homegrown alternatives such as Huawei chips used by Z.ai for its GLM-5.2 model.
External pressures compound domestic concerns. U.S. regulatory actions, including an FCC ban on new foreign-made humanoid robots in July and moves to restrict Chinese optical parts in data centers, have hurt suppliers like Zhongji Innolight and Eoptolink, whose stocks are down about 60% from peaks. Meanwhile, global macroeconomic factors, such as Brent crude exceeding $111 and 10-year Treasury yields near 5%, are pressuring risk assets worldwide, with Bitcoin briefly dipping below $80,000 ahead of the Federal Reserve’s October 28 decision.
The collapse in Chinese tech valuations reflects a structural disconnect between speculative enthusiasm and fundamental earnings power. With AI companies comprising over half of trading volume but facing doubts about their ability to recoup massive investments, the market is undergoing a painful repricing. The shift from a "speculative crazy bull" to a bear market suggests that retail-driven momentum, exemplified by Unitree’s initial listing surge followed by a halving in value, has exhausted itself against the backdrop of weak consumer spending and unproven business models.
Geopolitical friction accelerates this correction by fragmenting supply chains and limiting access to critical technology. U.S. restrictions on robotics and data center components directly impair the growth prospects of Chinese hardware manufacturers, forcing a pivot to domestic alternatives that may lack immediate competitive parity. As global interest rates remain elevated and energy costs rise, the dual pressure of internal valuation bubbles and external regulatory containment creates a challenging environment for institutional adoption of Chinese AI equities, likely prolonging the period of uncertainty and capital outflow.
