The A-share market saw mixed performances on June 18, with the STAR 50 Index surging 3.84% amid a volatile session. The ChiNext Index and Shenzhen Component Index rebounded, gaining 2.05% and 0.94% respectively. Trading volume on the Shanghai and Shenzhen exchanges reached 3.31 trillion yuan, marking an increase of 218.3 billion yuan from the previous day. Market activity was characterized by rapid sector rotations. The chip industry chain experienced a strong rally, with Cambricon Technologies soaring over 14% to a record high. The CPO concept also strengthened, as Accelink Technologies hit the daily limit up twice in four days. Meanwhile, the PCB sector maintained its momentum, with Shiming Technology achieving a 20% daily limit up for the second consecutive session. Conversely, the power sector faced volatility, with Shennandian A hitting the daily limit down. The financial sector continued to weaken, with notable declines in Xiamen Bank and major insurance companies. At the close, the Shanghai Composite Index fell by 0.43%.