On the midday break of August 4, 2026, the three major indices of A-shares collectively rose, with the Shanghai Composite Index up 0.16%, the Shenzhen Component Index up 2.74%, and the ChiNext Index up 4.83%. The optical module sector surged, with Lianxun Instrument surging over 18%, TFC Communication, Zhongji Innolight, and Yixing Optical Communication rising over 10%, and Dongshan Precision hitting the daily limit. The CRO concept strengthened, with WuXi AppTec and Asymchem hitting the daily limit. Bank stocks declined, with the four major state-owned banks—Industrial and Commercial Bank of China, Agricultural Bank of China, Bank of China, and China Construction Bank—all falling over 3%. More than 3,700 stocks across the market rose.