Core Viewpoint - The continuous decline in the number of shareholders in various companies indicates a trend of increasing concentration of shares, with 188 companies experiencing a decrease for more than three consecutive periods, and some, like Yihau New Materials, seeing a drop for 12 consecutive periods [1] Group 1: Shareholder Trends - A total of 893 companies reported their latest shareholder numbers as of December 20, with 188 companies showing a continuous decline in shareholder numbers for over three periods [1] - Yihau New Materials has the lowest number of shareholders at 14,402, with a cumulative decrease of 37.94% over 12 periods [1] - Other companies with significant declines include Zhukebo Design, which has seen a 27.40% drop over 11 periods, and Kute Intelligent, Dadongnan, and Far East Transmission also showing notable decreases [1] Group 2: Market Performance - Among the companies with declining shareholder numbers, 46 have seen their stock prices rise, while 142 have experienced declines, with notable gainers including Shibu Detection (up 54.90%), Guojijiangong (up 52.63%), and Quanyin High-Tech (up 30.86%) [2] - 49 companies outperformed the Shanghai Composite Index during this period, representing 26.06% of the declining shareholder group, with Shibu Detection, Guojijiangong, and Quanyin High-Tech showing relative returns of 54.63%, 53.95%, and 32.18% respectively [2] Group 3: Industry Distribution - The industries with the highest concentration of companies experiencing declining shareholder numbers include basic chemicals (26 companies), machinery and equipment (21 companies), and pharmaceutical biology (18 companies) [2] - The main board has 114 companies with declining shareholder numbers, while the ChiNext board has 74 [2] Group 4: Institutional Activity - In the past month, 22 companies with declining shareholder numbers have been investigated by institutions, with Shengda Resources, Guojijiangong, and Shenzhen Huqiang receiving the most attention, having been investigated 6, 4, and 3 times respectively [2] - The companies with the highest number of institutional participants in their investigations are Shengda Resources (47 institutions), Guojijiangong (17 institutions), and Xinkai Technology (17 institutions) [2]