Stock market anomaly | CNOOC Oilfield Services (02883.HK) surged more than 4% in the morning and will announce its performance next Wednesday. Citigroup has initiated a 90-day catalyst observation on it.

According to the Wise Finance App, China Oilfield Services Limited (02883.HK) surged by over 4% in the morning session. As of the time of writing, it was up by 4.19% to 7.46 Hong Kong dollars, with a trading volume of 62.0124 million Hong Kong dollars.