The operator of the Dung Quat Oil Refinery in central Vietnam said revenues rose 17 percent year-on-year to VND21.05 trillion.
It had reported a loss of nearly VND2 trillion in the first quarter last year.
BSR went through a challenging 2020 as the Covid-19 pandemic pushed down oil prices, sending its revenues and profits plummeting, while a 51-day closure of the refinery caused a fall in output.
In the event it reported a loss of VND2.8 trillion for the full year.