[Youyan Silicon employee Liu Bing avoided losses of 70,000 yuan in insider trading and was fined 670,000 yuan.] On November 12, the Beijing Securities Regulatory Bureau issued an administrative penalty decision (Liu Bing). Liu Bing was investigated for insider trading in the shares of Youyan Semiconductor Silicon Materials Co., Ltd. Liu Bing is an employee of Youyan Silicon and works in the same office area as Sun, an insider of insider information. The two have a close relationship. On the evening of May 16, 2025, Liu Bing, Sun and others had a dinner and played cards. During the sensitive period of insider information, Liu Bing had contact with Sun. On May 19, 2025, Liu Bing controlled the use of the "Liu Bing" account, the "Zhan Mouxin" account, and the "Liu Moulin" account to sell 158,118 shares of "Youyan Silicon", with a selling amount of 1,769,186.41 yuan and a loss avoidance amount of 70,953.42 yuan. The Beijing Securities Regulatory Bureau decided to confiscate Liu Bing’s illegal income of 70,953.42 yuan and impose a fine of 600,000 yuan.