午间涨跌停股分析：111只涨停股、2只跌停股，证券IT概念活跃，指南针、大智慧2连板

Group 1 - A-shares experienced significant activity with 111 stocks hitting the daily limit up and only 2 stocks hitting the limit down on August 18 [1] - The securities IT concept was notably active, with stocks like Zhinan Zhen and Dazhihui achieving consecutive limit ups [1] - The CPO concept also showed strength, with stocks such as Ruijie Network and Cambridge Technology reaching limit up [1] - The film and theater sector saw gains, with Huace Film and Bainacheng hitting limit up [1] Group 2 - *ST Aowei (rights protection) achieved 8 limit ups in 9 days, while *ST Huarong recorded 6 consecutive limit ups [1] - Huasheng Tiancai had 5 limit ups in 8 days, and Tongzhou Electronics achieved 5 limit ups in 6 days [1] - Other notable stocks include *ST Nanzhi with 5 consecutive limit ups, Zhongdian Xinlong with 4 limit ups in 5 days, and Changcheng Securities with 4 limit ups in 4 days [1] - *ST Gaohong (rights protection) faced a continuous decline with 6 consecutive limit downs, and Wantong Development (rights protection) also hit the limit down [2]