Hoang Thi Yen, sister-in-law of Kosy chairman Nguyen Viet Cuong, has registered to buy eight million KOS shares, VnExpress reports. The plan announced on October 8 aims to raise her holding from approximately 0.01% to 3.71%, with trading expected to run until mid-November. It follows a sharp decline in the stock. The registered volume and target ownership remain planned figures: the announcement does not confirm that the purchases have been completed.