Group 1 - The stock price of Haimer Technology closed at 8.33 yuan on August 20, 2025, with an increase of 0.06 yuan, representing a rise of 0.73% compared to the previous trading day [1] - The trading volume on that day was 175,557 hands, with a total transaction amount of 146 million yuan, and the price fluctuation was 2.42% [1] - Haimer Technology operates in the mining industry, focusing on the manufacturing of oil and gas field equipment and providing technical services [1] Group 2 - An independent director, Wan Hongbo, submitted a written resignation report to the board due to personal work arrangements, and after resigning, he will no longer hold any position in the company [1] - On August 20, the net outflow of main funds was 3.1538 million yuan, with a cumulative net outflow of 37.1823 million yuan over the past five days [1]