Stocks on China’s mainland have lost about $2.4 trillion in market value, representing the total worth of all their shares, since May, as investors increasingly lose faith that Beijing’s artificial intelligence boom will ever turn a sustainable profit.
That staggering financial evaporation is larger than South Korea’s entire economy produces in a single year, highlighting the immense scale of the fallout currently reverberating through global financial markets. The downturn underscores a severe reevaluation of tech valuations as market participants confront the harsh reality of high capital expenditures paired with uncertain monetization paths.
According to data from Goldman Sachs, artificial intelligence-related companies now make up 42% of the total market value of Chinese shares listed across both the mainland and Hong Kong, alongside driving a massive 57% of overall trading volume. Because the sector occupies such a dominant portion of the local equity ecosystem, when AI stocks suffer a downturn, the entire broader market is dragged down with them in a synchronized cascade.
The heavy selling pressure culminated on October 22 when the CSI 300, a benchmark index tracking China’s 300 largest listed companies, officially entered a bear market. A bear market designation represents a decline of at least 20% from a previous peak, signaling widespread bearish sentiment among institutional and retail investors alike.
The sharpest damage within the broader market has targeted Shanghai’s STAR 50, a specialized index comprising 50 of the nation’s largest technology and semiconductor companies. That index plunged by 40% in less than four months, erasing approximately $480 billion in equity value.
Despite this catastrophic correction, the STAR 50 still trades at roughly 100 times earnings. This elevated price-to-earnings ratio shows that investors are paying for roughly a century of current profit at present valuation levels, though the figure has fallen sharply from nearly 250 times earnings at its peak. By comparison, the Nasdaq 100, the primary U.S. technology stock benchmark, typically sits at a much lower valuation multiple around 30 times earnings.
Market anxiety over Chinese tech valuations has been repeatedly stoked by disruptive breakthroughs and escalating geopolitical friction over semiconductor supply chains. In January 2025, a Chinese startup named DeepSeek released an exceptionally cheap and powerful AI chatbot, triggering a global shockwave. Nvidia, the American semiconductor giant whose high-end graphics processing units power the vast majority of global artificial intelligence workloads, lost nearly $600 billion in market value in a single trading day following the release. Later in July, Moonshot AI introduced Kimi K3, another advanced model produced by a domestic Chinese AI lab, which sent semiconductor and hardware stocks tumbling once again.
In response to mounting security concerns and shifting strategic priorities, Beijing aggressively pushed its domestic tech giants toward homegrown semiconductor alternatives. According to reports from the Financial Times, China’s internet regulator instructed major domestic internet and technology firms, including ByteDance and Alibaba, to halt their purchases of Nvidia chips in September 2025. Demonstrating the domestic pivot, Beijing-based lab Z.ai publicly stated that it successfully trained its GLM-5.2 artificial intelligence model entirely on domestic Huawei microchips.
Financial analysts point to a combination of weak domestic consumer spending and deep-seated skepticism regarding whether AI firms can successfully earn back the billions of dollars they have poured into infrastructure and research. This speculative fever and subsequent correction were vividly illustrated by the market debut of humanoid robot maker Unitree in August. The company drew retail orders for an astounding 8,000 times the number of shares initially on offer during its public listing. However, the stock quickly reversed course and lost almost half of its initial value, even after registering a significant recovery during recent trading sessions.
"The stock market later evolved into a speculative crazy bull," said Dong Baozhen, a Beijing-based fund manager, describing the unsustainable trajectory of the local tech sector. "And now we see the bubble bursting."
International trade barriers have added further downward pressure on Chinese tech suppliers. The U.S. Federal Communications Commission instituted a formal ban on imports of new foreign-made humanoid robots in July, citing national security grounds. Simultaneously, Washington has moved forward with legislative and regulatory measures aimed at banning Chinese-made optical components from U.S. data centers. As a result of these tightening global restrictions, major Chinese optical equipment manufacturers such as Zhongji Innolight and Eoptolink have seen their stock prices plummet by about 60% from their previous all-time peaks.
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