China's CSI 300 enters bear market as 10-week selloff deepens

China's benchmark CSI 300 index entered bear-market territory on Thursday, October 22, falling 20% from its June peak as a prolonged retreat in mainland equities deepened, CNBC reported. The milestone puts the scale of the decline in sharper focus after a selloff stretching across 10 weeks.

The 20% threshold is a widely used market convention rather than a forecast of what comes next. Crossing it describes the damage already sustained from a previous high; it does not establish whether shares are approaching a bottom or face a further sustained decline. The duration of the retreat adds another dimension to the headline loss.

The index covers 300 large stocks listed in Shanghai and Shenzhen. LSEG figures cited by CNBC showed it was down 2.6% for the week and trading more than 1% lower on Thursday. Those readings were reported during the session, rather than as final figures for either the day or the week.

Pressure on company profitability forms part of the backdrop. Pella Funds chairman and chief investment officer Jordan Cvetanovski told CNBC that excess capacity and past overinvestment remained structural challenges, including in competitive industries such as batteries. His assessment distinguishes opportunities in individual businesses from the difficulties confronting the broader market.

That distinction matters when interpreting a benchmark's fall. An index can capture a broad deterioration in market confidence without showing that every constituent faces the same commercial outlook. Equally, the presence of competitive companies does not, by itself, explain when demand for their shares will return or whether a market-wide recovery can last.

China Market Research Group managing director Shaun Rein pointed to geopolitical uncertainty, concerns about an artificial intelligence bubble and weaker consumer confidence as sources of further selling pressure, CNBC reported. He also said individual investors could amplify volatility by withdrawing quickly during uncertainty. These were assessments of the forces behind the retreat, not assurances about its next stage.

Rein nevertheless considered the selling excessive, citing resilient exports and improving property prices in major cities, and forecast a strong equity rebound in 2027. State Street Markets strategist Daniel Gerard separately suggested that China's AI capabilities could attract international investors before earnings recover. Both offered potential routes toward renewed interest rather than evidence that a turnaround was already under way.

The immediate question is whether the CSI 300 can interrupt its extended decline and sustain any subsequent gains. Beyond that, the contrasting assessments frame a broader test: whether investors regain confidence before corporate results improve, or wait for clearer evidence of stronger profitability. The bear-market threshold marks the depth of the setback, while leaving that timing unresolved.