午后异动！300557，“20cm”涨停

Group 1: Optical Communication Sector - The optical communication concept is experiencing a strong rebound, with companies like LIGONG Optical Science (300557) hitting the daily limit up of "20cm" [2] - Tongding Interconnection has seen a rise with two consecutive trading days of gains, while other companies such as Changfei Optical Fiber, Fenghuo Communication, and Hengtong Optic-Electric are also following suit [2] Group 2: Market Performance - The A-share market is showing overall positive performance, with all three major indices rising and a total market turnover of 12,860 billion, with over 4,600 stocks increasing in value [8] - The dairy industry concept is also gaining strength, with companies like Huanlejia reaching a "20cm" limit up and an increase of over 18% at the time of reporting [8]