The Shanghai Stock Exchange said it took self-regulatory actions this week against 277 cases of abnormal securities trading, including suspected price ramping and suppression and false order submissions, according to Jiemian News. The exchange said it placed stocks with unusual volatility including Hengshang Energy Saving, GRINM Semiconductor Materials (Youyan Silicon) and CSSC Special Gas under close monitoring, and also focused on funds with relatively high premiums such as Caitong Fuxin LOF. It also conducted special checks on 23 cases involving major matters at listed companies and reported one suspected illegal or non-compliant case lead to the China Securities Regulatory Commission (CSRC).