China's major A-share indexes weakened on Aug. 11, with the Shanghai Composite down 0.4% to 3,951 and the Shenzhen Component off 0.5% to 14,249 by the close after opening lower and remaining under pressure through the session. Sentiment was hurt by selling in AI and other high-growth technology names, while market breadth was weak, with more than 3,700 stocks declining. Combined turnover on the Shanghai and Shenzhen exchanges reached 2.32 trillion yuan, down 202.1 billion yuan from the previous trading day. Oil and gas, coal and precious-metals shares advanced amid geopolitical concern tied to U.S.-Iran tensions and the Strait of Hormuz, while robot, MLCC, innovative drug, pharmaceutical commerce and computing power rental shares also showed localized strength. Analysts including Huatai Securities and Jinyuan United Securities said rapid sector rotation, earnings-season verification and uncertainty around external policy and geopolitics support balanced positioning rather than expecting a broad market rally.