A股最强赛道，突然杀跌

Market Overview - The A-share market opened higher on August 21, with the Shanghai Composite Index rising by 0.12%, the Shenzhen Component Index by 0.33%, and the ChiNext Index by 0.28%. However, over 3,200 companies in the market experienced declines by 10:00 AM [1]. Sector Performance - Sectors such as digital currency, cross-border payments, rare earths, fintech, and cybersecurity saw significant gains, while sectors like copper-clad laminates, liquid cooling servers, circuit boards, optical modules (CPO), optical communications, PEEK materials, consumer electronics manufacturing, photolithography machines, and robotic technology faced notable declines [3][4]. Notable Index Movements - The Wind Liquid Cooling Server Index fell by 3.56%, with companies like Feilong Co. and Tenglong Co. nearing their daily limit down, and others like Kexin New Source and Yingweike dropping over 5% [5]. - The Wind Optical Module (CPO) Index decreased by 3.38%, with significant drops in companies such as Cambridge Technology and Guangku Technology, both falling over 5% [7]. - In the consumer electronics manufacturing sector, companies like Furi Electronics and Lingyi Technology saw declines exceeding 3% [9]. Highlighted Stocks - Despite the overall market downturn, Cambrian Biologics (寒武纪-U) continued to rise, reaching a new historical high with a stock price increase of 3.65%, bringing its market capitalization to over 440 billion yuan [9][10]. - ZTE Corporation initially surged by 9.99% but later opened its limit, with trading volume exceeding 12.6 billion yuan [10].