China’s Artificial Intelligence Market Faces Historic Retraction as $2.4 Trillion Evaporates

Stocks on China’s mainland have suffered a staggering loss of approximately $2.4 trillion in market value since May, driven by a growing wave of investor skepticism over whether Beijing’s high-flying artificial intelligence boom will ever materialize into sustainable profits. To put the scale of the downturn into perspective, the wealth wiped out from the mainland market in less than half a year exceeds the entire annual economic output of South Korea.

The dramatic reversal highlights the immense volatility of a sector that has come to dominate China’s financial landscape. According to data from Goldman Sachs, AI-related companies currently account for a massive 42% of the total market capitalization of Chinese shares listed both on the mainland and in Hong Kong. Furthermore, these tech issues drive an astonishing 57% of total trading volume. Because the sector occupies such an outsized footprint in the national economy, when AI stocks stumble, the entire broader market is dragged down with them.

The cascading effects of this investor retreat pushed the CSI 300, a key benchmark tracking China’s 300 largest listed companies, firmly into a bear market on October 22. In financial terms, a bear market signifies a drop of at least 20% from a recent peak, signaling a profound shift in market sentiment from unbridled optimism to deep-seated caution.

The most severe damage has been concentrated within Shanghai’s STAR 50 index, a specialized gauge tracking 50 of the country’s largest technology and semiconductor firms. The index plummeted by 40% in less than four months, effectively erasing about $480 billion in value. Despite this punishing correction, valuations remain remarkably high compared to Western counterparts. The STAR 50 still trades at roughly 100 times earnings—meaning investors are paying for a century of current corporate profits—though that figure represents a steep descent from nearly 250 times earnings at its peak. By comparison, the Nasdaq 100, the benchmark index for American technology giants, hovers around a price-to-earnings ratio of 30.

This historic market correction did not occur in a vacuum; it has been repeatedly jolted by a series of technological disruptions and geopolitical shocks. The tremors began in earnest in January 2025, when Chinese startup DeepSeek introduced an exceptionally cheap and powerful AI chatbot to the global market. The release sent immediate shockwaves across the Pacific, causing U.S. chip giant Nvidia—whose advanced processors power the vast majority of global artificial intelligence infrastructure—to lose nearly $600 billion in market value in a single trading session. The vulnerability of the sector was exposed again in July when Moonshot AI unveiled its Kimi K3 model, another product of a domestic Chinese AI lab that similarly sent domestic chip stocks tumbling.

Amid these rapid market shifts, Beijing intensified its push for technological self-reliance, directing domestic tech giants to pivot away from foreign hardware. According to reports from the Financial Times, China’s internet regulators instructed major internet and technology firms, including ByteDance and Alibaba, to halt their purchases of Nvidia chips in September 2025. Domestic labs quickly rushed to fill the void; Beijing-based Z.ai proudly announced that it trained its GLM-5.2 model entirely on domestic Huawei chips, showcasing the rapid militarization and industrial localization of China’s AI supply chain.

However, financial analysts point out that underlying structural weaknesses, including chronically sluggish consumer spending within China and persistent doubts over the monetization timelines of heavy AI investments, are catching up with the market. Retail enthusiasm, which once drove speculative frengies, has turned into sharp caution. For instance, humanoid robot manufacturer Unitree drew retail orders for an astonishing 8,000 times the shares on offer when it went public in August. Even after experiencing a notable market recovery during the week, the company’s stock has still lost nearly half of its value since its initial public offering.

"The stock market later evolved into a speculative crazy bull," said Dong Baozhen, a Beijing-based fund manager, describing the euphoric trading environment that preceded the crash. "And now we see the bubble bursting."

Compounding the domestic pressure, international regulatory hurdles have added another layer of risk for Chinese tech firms operating globally. In July, the U.S. Federal Communications Commission instituted a ban on imports of new foreign-made humanoid robots, citing national security concerns. Washington has also advanced legislative and regulatory efforts to restrict Chinese-made optical components from being utilized in United States data centers. Consequently, shares of major Chinese optical suppliers Zhongji Innolight and Eoptolink have suffered steep declines, trading down about 60% from their all-time peaks as the global technology decoupling continues to reshape supply chains and investor outlooks.