It blamed the losses mainly on the poor performance in the second quarter when fuel prices fluctuated dramatically.
Its revenues were up 28% to VND7.4 trillion ($313.56 million) but were only half the targeted sum.
Its gross profits fell by two-thirds even as selling and interest expenses skyrocketed.
The major supply of fuels in the Mekong Delta had been consistently profitable between 2017 and 2021.
On the Ho Chi Minh Stock Exchange, the company's shares closed at VND5,400 ($0.23) Wednesday after losing 3%. The shares of many other petroleum firms, including PLX, OIL, PVT, and POW, also fell.