A股指数走弱：创业板指跌逾2%，此前一度涨近2%

Market Overview - A-shares indices weakened, with the ChiNext Index dropping over 2% and the Shanghai Composite Index down 1.18% [1] - Nearly 1,900 stocks declined across the Shanghai, Shenzhen, and Beijing markets [1] Index Performance - Shanghai Composite Index closed at 3,768.57, down 1.18%, with 1,245 gainers and 982 losers [2] - Shenzhen Component Index closed at 12,289.86, down 1.46%, with 1,982 gainers and 849 losers [2] - ChiNext Index closed at 2,834.16, down 2.25%, with 958 gainers and 405 losers [2] - North Star 50 Index increased by 1.22% to 1,570.39, with 236 gainers and 34 losers [2] Sector Performance - CPO concept stocks collectively plummeted, with Yuanjie Technology falling over 10% and several others, including Taicheng Light, Tianfu Communication, and others, dropping over 5% [2] - Chip stocks also saw a significant decline, with companies like Cambricon, Tongfu Microelectronics, and others falling over 5% [3]