Group 1 - A-shares saw 52 stocks hitting the daily limit up and 18 stocks hitting the daily limit down on January 20, indicating a volatile trading session [1] - The cement sector was notably active, with stocks like Hongbaoli and Subote reaching the daily limit up [1] - The housing rental concept strengthened, with Hefei Urban Construction achieving two limit ups in three days and I Love My Home hitting the daily limit up [1] Group 2 - The epoxy propylene sector also saw gains, with Weiyuan Co. hitting the daily limit up [1] - Continuous limit-up stocks included Jiamei Packaging with 16 limit ups in 23 days and Fenglong Co. with 15 consecutive limit ups [1] - Stocks facing consecutive limit downs included *ST Aowei with 8 days of limit downs and *ST Yanshi with 6 days of limit downs [1]