China’s AI Bubble Just Lost $480 Billion. Is the Rest of the World Next?

The global AI boom has been built on extraordinary expectations. In China, investors are now getting a preview of what happens when those expectations reset.

The STAR50 index, which includes many of China's leading AI and semiconductor companies, has fallen roughly 40% in less than four months. Reuters estimates that about $480 billion in market value has disappeared.

A rally that became too crowded

AI-related companies had grown to an unusually large share of China's market value and trading activity. Retail investors piled into robotics, chips and optical components as policy support and excitement around domestic technology pushed valuations higher.

The correction has been severe. Several highly promoted technology names have fallen sharply from their peaks, and some companies that surged after listing have given back much of those gains.

Valuations are still high

Even after the decline, the STAR50 reportedly trades at a much higher earnings multiple than the Nasdaq 100. That suggests the selloff may not automatically mean the sector is cheap.

Investors are also weighing export restrictions, competition, price wars and questions about whether AI demand can grow fast enough to justify the capacity being built.

Why the rest of the world should pay attention

China's market is different from the U.S., but the underlying issue is familiar: when too much capital crowds into one theme, even good companies can become overpriced.

The Chinese correction does not prove a global AI crash is coming. It does show that enthusiasm alone cannot support valuations forever.