The sale of its 20.1m shares in Vietnam Maritime Bank has been set for 8 December at the Hanoi Stock Exchange, the Vian news agency said.
The lender was established by the government's maritime department.
But Vinalines' stake is only just over 1% and it does not have an administrative role.
The bank's capital was VND 8 trillion ($377.5m) at the end of 2013.
Vinalines