New York-listed NAT is paying $0.38 per share to investors for the first quarter of 2015.
The figure marks a hike from $0.22 per share in the final three months of 2014 and $0.12 per share a year ago.
NAT says the change comes following a positive market development in the first quarter of 2015.
The owner, which has paid 71 successive dividends since its 1997 listing, will release its first quarter results on 11 May.
