主力个股资金流出前20：包钢股份流出13.23亿元、长江电力流出9.19亿元

Group 1 - The main focus of the article is on the significant outflow of capital from major stocks as of July 31, with specific amounts listed for each company [1] - The top three companies with the highest capital outflow are Baogang Co., Ltd. (-1.32 billion), Changjiang Electric Power (-0.92 billion), and Northern Rare Earth (-0.86 billion) [1] - Other notable companies experiencing capital outflow include Ningde Times (-0.84 billion), Guizhou Moutai (-0.70 billion), and BYD (-0.57 billion) [1] Group 2 - The total capital outflow from the listed companies indicates a trend of investors pulling back from these stocks [1] - The data reflects a broader market sentiment that may impact future investment strategies in these sectors [1]