Hai Phong Building Materials Joint Stock Company signed a contract to acquire an unknown stake in DNA Investment Joint Stock Company (HNX:KSD) from Nguyen Huu Bien on March 12, 2019. Hai Phong Building Materials Joint Stock Company cancelled the acquisition of an unknown stake in DNA Investment Joint Stock Company (HNX:KSD) from Nguyen Huu Bien on March 12, 2020.