Core Viewpoint - Nine A-shares, including SMIC and Roadbridge Information, have had their financing and securities margin rates adjusted to zero due to their static price-to-earnings (P/E) ratios exceeding 300 or being negative, as part of a dynamic risk control measure by several securities firms [2][5][10]. Group 1: Adjustments and Impact - Multiple securities firms, including Dongfang Caifu Securities and Guorong Securities, confirmed the adjustment of financing and securities margin rates for nine stocks to zero, effective October 9 [2][3]. - Following the announcement, stocks such as SMIC and Roadbridge Information experienced significant declines, with SMIC's A-shares dropping by 0.87% and Roadbridge Information's shares falling by 17.24% [5][6]. - The adjustment means that these stocks temporarily lose their function as collateral for financing, significantly reducing investors' ability to leverage these stocks [5][6]. Group 2: Reasons for Adjustment - The adjustments are based on the rules of the Shanghai, Shenzhen, and Beijing Stock Exchanges, which state that stocks with a static P/E ratio above 300 or negative must have their financing margin rates set to zero [5][10]. - The highest static P/E ratio among the affected stocks was 947 for Roadbridge Information, while SMIC and Baiwei Storage had static P/E ratios of 303 and 301, respectively [7][8]. Group 3: Recovery Conditions - The financing margin rates can be restored if the static P/E ratios of the affected stocks fall below 300 in the future, as demonstrated by other stocks like Sifang Precision and Jikong Co., which had their rates restored after meeting this criterion [10].