A-share Midday | Shanghai Composite Index Rises 0.16%, Lab-grown Diamond and MLCC Concepts Strengthen Collectively

Title context: A-share Midday | Shanghai Composite Index Rises 0.16%, Lab-grown Diamond and MLCC Concepts Strengthen Collectively Text: On September 14, the three major A-share indices opened lower collectively, then fluctuated upward. The Shanghai Composite Index turned positive and maintained narrow-range consolidation, while the Shenzhen Component Index and ChiNext Index turned positive intraday before pulling back, remaining slightly lower at the midday close. The divergence between the yellow and white lines was pronounced, with small- and mid-cap stocks showing relatively strong performance. The market displayed a divergent pattern of "Shanghai strong, Shenzhen weak, theme rotation, and shrinking volume." As of the midday close, the Shanghai Composite Index rose 0.16% to 3894.28 points, the Shenzhen Component Index fell 0.25% to 13436.92 points, and the ChiNext Index fell 0.47% to 3306.36 points. Across the entire market, 3,576 stocks rose and 1,797 stocks fell, with 50 stocks hitting the daily limit up and 10 stocks hitting the daily limit down. Half-day turnover across the Shanghai, Beijing, and Shenzhen markets totaled 1,113.9 billion yuan, a decrease of 170.8 billion yuan from the previous trading day. On the capital flow front, the PCB concept received a net inflow of 5.607 billion yuan from main funds, with 8 stocks in the sector hitting the daily limit up. Market Overview On the board, on the upside, lab-grown diamond, CRO concept, and medical services sectors led the gains, MLCC and cybersecurity concepts strengthened collectively, and the automobile sector rebounded amid volatility; on the downside, planting, military equipment, and communication equipment sectors led the declines. Overall, market volume shrank noticeably compared with the previous trading day, with funds rotating rapidly among theme directions. Lab-grown diamond, CRO, and PCB directions received capital inflows; at the same time, high-flying popular stocks adjusted collectively, with Heilongjiang Publishing&Media Holdings, Xinjiang Talimu Agriculture Development, and Gansu Dunhuang Seed Group hitting the daily limit down. Hot Sectors 1. Lab-grown diamond concept strengthens The lab-grown diamond concept strengthened, with Henan Huanghe Whirlwind and Hengsheng Energy hitting the daily limit up, among which Hengsheng Energy was a reverse-package limit-up; Inno Laser Technology rose over 15%, Henan Liliang Diamond rose over 9%, and Sf Diamond Co., Ltd. and HFZS followed the gains. Comment: On the news front, institutional research reports pointed out that diamond copper is expected to achieve large-scale application first due to the triple advantages of thermal conductivity, cost, and thermal expansion matching. From 2025 to 2029, the global AI chip diamond copper market compound growth rate is expected to reach 237%, and the market space is expected to expand to US$6.5 billion. In addition, the BSE 50 index sample adjustment took effect on September 14, and HFZS was included. 2. MLCC concept strengthens collectively The MLCC concept strengthened collectively, with Jiangsu Shuangxing Color Plastic New Materials posting a second consecutive limit-up, Kangda New Materials hitting the daily limit up, Suzhou Gyz Electronic Technology rising over 8%, Shandong Chunguang Technology Group rising over 7%, and Guangdong Fenghua Advanced Technology following the gains. Comment: On the news front, according to multiple media reports, Murata Manufacturing recently issued a notice to customers announcing the launch of product line optimization in fiscal 2026, gradually discontinuing certain specifications of MLCC across nine major seriesGRM, GRJ, GRT, GXM, GXT, GCM, GCJ, GCG, and ZRAcovering consumer electronics, automotive-grade, and RF application fields, while expanding advanced high-end product lines and prioritizing supply of high-value-added products for AI servers. Separately, Samsung Electro-Mechanics signed a long-term MLCC supply agreement worth approximately 1.07 trillion won with a major global technology company earlier this month for AI servers, setting a record for the company's single order value. 3. CRO concept active The CRO concept was active, with Anhui Wanbang Pharmaceutical Technology and Novoprotein Scientific Inc. hitting the 20CM daily limit up, Sino Biological, Inc. rising over 10%, and Asymchem Laboratories, Pharmaron Beijing, and WuXi AppTec following the gains. Comment: On the news front, from September 12 to 15, the 2026 World Conference on Lung Cancer (WCLC) was held in Seoul, South Korea, where multiple domestic pharmaceutical companies disclosed clinical data in a concentrated manner. Among them, AKESO released significantly positive overall survival (OS) results from the Phase III HARMONi-2 study of ivonescimab versus pembrolizumab as first-line treatment for PD-L1-positive non-small cell lung cancer. The study was selected by the conference as an oral presentation as a late-breaking abstract; HANSOH PHARMA announced interim analysis results from the Phase III ARTEMIS-008 study of the B7-H3-targeted ADC recanlifutamab, which met the primary endpoint of overall survival. 4. Cybersecurity concept rises The cybersecurity concept rose, with Shenzhen Sinovatio Technology posting a third consecutive limit-up, Integrity Technology Group Inc. and Beijing Bohui Science & Technology Co., Ltd. hitting the 20CM daily limit up, Topsec Technologies Group Inc. and Qiming Information Technology hitting the daily limit up, Hangzhou Dbappsecurity Co., Ltd. rising over 11%, and Surfilter Network Technology rising over 10%. Comment: On the news front, according to Cailian Press, Anthropic CEO Dario Amodei recently published a blog post titled "We Must Pace the Frontier," stating that the AI industry needs to slow the pace of new model development to allow enough time to complete model alignment with human goals and safety protections; subsequently, xAI founder Musk and OpenAI CEO Altman publicly expressed support one after another.