Herbjorn Hansson-led NAT carded a profit of $33.54m in the three months to the end of June, flipping a loss of $15.65m a year ago.
Earnings per share of $0.35 were two and a half cents ahead of what Wall Street was looking for.
Its suezmax fleet earned an average of $38,800 per day for the quarter as revenue rose from $22.62m
