Biocytogen-B (02315) and Asymchem (06821) experienced unusual trading activity at 1:46 PM, with stock prices increasing 10.09% and 10.10%, respectively, according to ETNet.

Biocytogen-B last traded at HK$63.85, while Asymchem closed at HK$145.00 and marked a 52-week high.

Both stocks showed an active buy-sell ratio of 64:36.