China's Star 50 index of AI and chip leaders is down by 40% in under four months, losing ~$480B in market value; chipmaker CXMT is down ~25% in the past month

Valuations for Chinese AI and chip stocks are now significantly lower, making future fundraising more difficult for startups.

China's STAR50 index, comprising leading AI and chip companies, has plummeted by 40% in under four months, erasing approximately $480 billion in market value. This significant downturn reflects a collapse in AI valuations as investor enthusiasm wanes and questions arise about corporate profitability and the high price-to-earnings ratios of Chinese semiconductor and robotics firms. The broader CSI 300 index has also entered bear market territory, falling 20% from its June peak. Concurrently, Nvidia faces increasing competition within China's data-center AI accelerator market. IDC research indicates Nvidia's market share in China fell to 34% in the first half of 2026, with shipments dropping 44% year-over-year, partly due to U.S. export controls and the rise of domestic competitors like Huawei.

The sharp decline in China's AI stock market, highlighted by the STAR50 index's 40% drop, signals a potential recalibration of high-growth technology valuations globally. Even after this correction, the STAR50 index trades at a trailing earnings multiple of around 100, far exceeding the Nasdaq 100's 30, suggesting that elevated expectations for future growth persist despite the market's plunge. This disconnect could leave investors vulnerable to further volatility if performance does not meet these ambitious projections.

Nvidia's shrinking market share in China, now at 34% for AI accelerators, underscores the growing success of domestic players like Huawei. While U.S. export controls are a factor, the situation demonstrates Beijing's effective strategy of fostering a self-sufficient domestic semiconductor ecosystem. This shift presents a complex challenge for Nvidia, as it must navigate geopolitical restrictions while contending with increasingly capable local competition, even as global demand for its AI chips remains strong.