China's A-share market closed with a sharp split on Aug. 18 as the Shanghai Composite Index rose 0.19% to 3,990.3, leaving it just below the 4,000 mark, while the Shenzhen Component Index fell 0.56% to 14,622.5 and the ChiNext Index dropped 0.92% to 3,705.56. The STAR Composite Index bucked the broader growth weakness with a 0.27% gain to 2,104.77. Combined turnover on the Shanghai and Shenzhen exchanges reached 2.4 trillion yuan, up 13.3 billion yuan from the previous session, yet market breadth stayed weak with more than 3,200 stocks falling. Seed stocks were the clearest winners, with Shennong Seed, Dunhuang Seed and other names hitting limit-up as investors bet on stronger agricultural policy support and food security themes, while oil and gas shares also benefited from commodity-price moves. Cloud gaming, film and healthcare stocks lagged, with Kaiser Culture and Yoozoo Games falling more than 2%, underscoring a market driven by fast sector rotation rather than broad risk appetite.