今日涨跌停股分析：143只涨停股、2只跌停股，PVC概念活跃，氯碱化工、中泰化学等涨停

Group 1 - A-shares experienced significant activity on January 6, with 143 stocks hitting the daily limit up and only 2 stocks hitting the limit down [1] - The PVC concept saw notable activity, with companies like Chlor-alkali Chemical and Zhongtai Chemical reaching the limit up [1] - The securities IT concept strengthened, highlighted by Dazhihui hitting the limit up [1] - The small metals sector also rose, with companies such as Xiyu Co. and Anning Co. reaching the limit up [1] Group 2 - Continuous limit-up stocks included Shengtong Energy with 13 consecutive limit-ups, and Jiamei Packaging with 11 limit-ups over 13 days [1] - Other notable continuous limit-up stocks included Fenglong Co. with 8 consecutive limit-ups, and *ST Dongyi with 7 limit-ups over 10 days [1] - Stocks like Lvxin Chuangtou and ST Bailing achieved 6 limit-ups over 8 days, while companies such as Leike Defense and Beidouxing achieved 4 limit-ups over 6 days [1] Group 3 - Declining stocks included Dengyun Co. and ST Derun, both hitting the limit down [2]