Group 1 - The core viewpoint of the news is that Suzhou Su Test Experiment Group Co., Ltd. has seen a significant increase in its stock price, rising by 5.22% to reach 20.96 yuan per share, with a trading volume of 600 million yuan and a turnover rate of 5.81%, resulting in a total market capitalization of 10.659 billion yuan [1] - The company, established on December 29, 2007, and listed on January 22, 2015, specializes in environmental and quality reliability testing and analysis services for industrial products, focusing on the research and production of environmental testing equipment [1] - The revenue composition of the company's main business includes: environmental reliability testing services at 49.19%, testing equipment at 31.27%, integrated circuit verification and analysis services at 15.63%, and other supplementary services at 3.91% [1] Group 2 - From the perspective of the top ten circulating shareholders, Southern Fund has a fund that ranks among the top shareholders of Su Test Experiment, specifically the Southern CSI 1000 ETF (512100), which holds 3.2527 million shares, accounting for 0.64% of the circulating shares [2] - The Southern CSI 1000 ETF was established on September 29, 2016, with a current scale of 76.63 billion yuan, and has achieved a year-to-date return of 7.05%, ranking 1300 out of 5579 in its category [2] - The fund has a one-year return of 45.31%, ranking 1627 out of 4202 in its category, and a cumulative return since inception of 22.43% [2]