Two listed companies showed unusual trading activity at 9:49 a.m., according to ETNet.

Lightron Health (02661) slipped 0.51% to HK$4.87, marking a fresh listing low. The stock's buy-sell ratio was 41:59, and it has fallen for three consecutive sessions, for a total decline of 5.98%.

Baidu (09888) declined 2.91% to HK$93.40, with a buy-sell ratio of 59:41. Its yuan-denominated counter, 89888, fell 2.6% to RMB80.1.