On August 13th, during the midday trading break, China's A-share market witnessed a collective surge across its three primary indices. The Shanghai Composite Index climbed by 0.42%, the Shenzhen Component Index advanced by 0.73%, and the ChiNext Index surged by 1.61%. The CPO (Coherent Optical Communication) and semiconductor sectors spearheaded the market's gains. Notably, Tianfu Communication and Biyi Microelectronics soared by over 10%, while Yuanjie Technology and MetaX experienced increases exceeding 8%.

CRO (Contract Research Organization) concept stocks also demonstrated robust performance, with Boji Pharmaceutical hitting the daily limit (the maximum price movement allowed in one trading day), and Bide Medicine and Pharmablock surging by more than 10%. Conversely, the precious metals and oil and gas sectors faced significant downturns. Xiaocheng Technology plummeted by over 6%, and China National Offshore Oil Corporation witnessed a decline exceeding 2%.