午间涨跌停股分析：37只涨停股、13只跌停股，铁矿石概念活跃，广东明珠涨停

Core Viewpoint - The A-share market showed significant activity with 37 stocks hitting the daily limit up and 13 stocks hitting the limit down, indicating a volatile trading environment on October 17th [1] Group 1: Market Performance - The iron ore concept stocks were particularly active, with Guangdong Mingzhu reaching the daily limit up [1] - Notable stocks with consecutive limit ups include Dayou Energy and Hefei Urban Construction with 5 limit ups in 6 days, and Yuanda Holdings with 4 consecutive limit ups [1] - Other stocks showing strong performance include Guo Xin Energy with 3 limit ups in 4 days, and Shanghai Shendi Development and ST Xinhuajin with 3 consecutive limit ups [1] Group 2: Declining Stocks - *ST Yuancheng experienced 5 consecutive limit downs, indicating significant downward pressure [1] - Other stocks facing declines include Songyang Resources and Tianpu Shares, both with 2 consecutive limit downs, and *ST Jinbi and *ST Yatai also hitting the limit down [1]