Why is A2 Milk stock tumbling today?

Global markets show mixed performance across various sectors. Positive momentum is seen with Alibaba, Geely Automobile, Zijin Gold International, and HUTCHMED. Additionally, Shanghai Biren Technology, CanSino Biologics, and Shanghai Henlius Biotech are rallying. Conversely, several stocks are facing declines, including Aurizon, Trend Micro, A2 Milk, and Dentsu. Notably, JB Hi-Fi shares slid after flagging a weak start to FY27. Other tumbling stocks include Ebara, Ulvac, and National Australia Bank, reflecting a volatile trading session.