Overseas Shipholding Group was in the red in final quarter of the year.
The Tampa-based Jones Act player posted a $5.2m loss for the fourth quarter, a $0.05 per share loss and a year-over-year decline of $58.8m.
Despite the quarterly deficit, OSG logged a $13.5m profit for the full year, down from $56m in 2017.
The company's shipping revenue also dropped in the last three months of the year by 4% to $89.2m.
