China's CSI 300 index, the main gauge of large-cap mainland equities, has moved into a bear market. The benchmark now sits 20% below the peak it reached in June, which meets the commonly used definition of a bear market.
Wire coverage describes the decline as a prolonged one, with the index extending a rout that has run for about ten weeks. The reports characterize the selloff in mainland shares as deepening rather than stabilizing, and the crossing of the 20% threshold is presented as a milestone in that sustained retreat.
One strand of the reporting ties the latest leg lower to a rout in artificial intelligence-related stocks. The material reviewed by FXMARE does not break down how much of the index's fall can be attributed to that theme, nor does it name specific companies or sectors that contributed most, so the precise weight of AI shares in the decline remains unclear from the available information.
The CSI 300 tracks 300 large, liquid companies listed in Shanghai and Shenzhen, which is why it is widely used as a shorthand for the health of China's onshore market. A 20% drop from a recent high is a conventional marker of a sustained downturn, and its breach often draws attention because it reflects a broad loss of value rather than a short-lived pullback.
The sources supplied do not give the index's closing level, the size of the most recent daily move, trading volumes, or any official response from regulators or policymakers. Those details are therefore not included here. What the reporting does establish is the central fact: after about ten weeks of declines, the benchmark has fallen 20% from its June high and is now officially in bear-market territory, with the AI-related selloff cited as a factor in the latest weakness.