At midday on September 3rd, China's three major stock indices opened sharply higher, with the Shanghai Composite up 0.29%, the Shenzhen Component up 0.73%, and the ChiNext up 0.90%. After an initial rally faded, the benchmarks climbed back in fluctuating trade, with the ChiNext and Shenzhen Component briefly turning red during the session. This created a bifurcated market where indices closed higher but a majority of individual stocks fell, with shipping and lab-grown diamond sectors leading the gains.
By the lunch break, the Shanghai Composite had risen 0.43% to 3,958.19 points, the Shenzhen Component was up 0.39% to 13,664.14 points, and the ChiNext had gained 0.43% to 3,326.42 points. Across the broader market, more than 3,100 stocks declined, with 43 hitting the daily limit up and 7 hitting the daily limit down. The combined turnover for the Shanghai and Shenzhen exchanges reached 1.1 trillion yuan in the morning, a decrease of 110.4 billion yuan compared to the previous trading day. Early main capital flows favored non-bank financials, securities, and non-ferrous metals sectors, while funds exited electronics, communications, and semiconductors, with the electronics sector seeing net outflows exceeding 4.5 billion yuan. Among individual stocks, San'an Optoelectronics attracted the highest net buying by main capital, exceeding 1 billion yuan.
Market Breakdown
On the upside, the shipping and lab-grown diamond concepts led gains, while the liquid cooling server and humanoid robot themes remained active. Insurance and securities sectors within the broader financial space moved higher. On the downside, the agricultural planting and grain concepts led losses, with dairy and chemical pharmaceuticals weakening. Previously popular high-flying stocks such as Chuanyi Education, Shenzhen Zhongheng Hua, Yiming Food, and Aili Home Furnishing saw a wave of limit-downs.
Overall, strength in heavyweight and financial stocks drove the three major indices higher, but with over 3,100 stocks falling, the wealth effect was weak as funds rotated away from earlier high-level themes and into shipping and lab-grown diamonds, driven by news catalysts.
Hot Sectors
1. Shipping Sector Rallies Broadly
The shipping sector surged collectively, with Hede Development, Fenghuang Shipping, and COSCO Shipping Energy hitting their daily limits. Guoyuan Shipping rose more than 10%, China Merchants Energy Shipping gained over 8%, and China Merchants Nanjing Oil Tanker and COSCO Shipping Specialized Carriers followed suit.
Commentary: On the news front, the Baltic Dry Index (BDI) jumped 174 points, or 5.5%, to 3,331 points on September 2nd, a new high since December 2023, with the Capesize index rising 8.1%. As the third quarter marks the traditional peak season for dry bulk shipping, concentrated shipments of iron ore, coal, and grains, combined with Middle East tensions causing detours for some vessels and shrinking effective capacity, have provided support for freight rates.
2. Lab-Grown Diamond Concept Strengthens
The lab-grown diamond concept strengthened, with Huanghe Whirlwind and Hengsheng Energy hitting their daily limits. Huifeng Diamond rose more than 10%, and Sifangda climbed over 8%, with Liliang Diamond and World adding gains.
Commentary: Institutional research notes indicate that lab-grown diamonds and industrial diamonds share high-pressure high-temperature (HPHT) synthesis technology, which can be combined with CVD epitaxial processes to produce semiconductor-grade diamond wafers, showing strong industry chain synergy. The rapidly growing demand for diamond functional materials is expected to transmit through the industrial chain to the lab-grown diamond segment.
3. Liquid Cooling Server Concept Stays Active
The liquid cooling server concept remained active, with Jitai Co. hitting its fourth consecutive daily limit, Jindi Co. achieving a 3-in-4-day pattern, Jinfu Technology at a 2-in-4-day pace, and Sisens Material rising over 10%.
Commentary: Institutional analysis points out that the overall increase in AI server shipments is likely to drive liquid cooling penetration rates to higher levels, potentially opening up revenue space for the liquid cooling industry chain. In its stock trading anomaly announcement, Jitai Co. cautioned that its liquid-cooled silicone oil product is still in the critical validation phase before commercial application and has not yet generated scaled orders or sales revenue.
4. Humanoid Robot Concept Fluctuates Higher
The humanoid robot concept oscillated upward, with Mashi Electric and Juli Intelligent hitting daily limits, while Zhaowei Electromechanics and Fengguang Precision also gained.
Commentary: On September 1st, Tesla CEO Elon Musk stated that the number of humanoid robots globally could reach 1 billion units within the next decade. Additionally, XPeng's humanoid robot business completed a first-round financing of over $900 million in late August, with a post-investment valuation exceeding $6.3 billion. The Ministry of Industry and Information Technology also began soliciting public comments in late August on the "National Humanoid Robot Industry Standard System Construction Guidelines (2026 Edition)," providing continued catalysts for the sector.