Group 1 - On December 8, a total of 12 companies were investigated by institutions, with 10 of them being surveyed by funds, highlighting a significant interest in Hengtong Optic-Electric, which attracted 12 fund participants [1] - The surveyed companies included 2 from the main board of the Shenzhen Stock Exchange, 6 from the ChiNext board, and 2 from the main board of the Shanghai Stock Exchange, indicating a diverse representation across different market segments [1] - The companies under investigation spanned 7 industries, with the electronics, machinery equipment, and pharmaceutical sectors having the highest representation, each featuring 2 stocks [1] Group 2 - Among the surveyed companies, 2 had a total market capitalization exceeding 50 billion yuan, while 7 had a market capitalization below 10 billion yuan, including companies like Yingli Co., Ltd., Yalian Machinery, and Taili Technology [1] - In terms of market performance, 4 out of the surveyed stocks increased in value over the past 5 days, with the highest gains seen in Boin Special Welding (26.53%), Chaojie Co., Ltd. (17.69%), and Taili Technology (1.68%); conversely, 6 stocks experienced declines, with the largest drops in China Merchants Energy (-13.66%), Zhongsheng Pharmaceutical (-9.67%), and Yingli Co., Ltd. (-2.72%) [1]