Herbjorn Hansson-led NAT has paid $2.56m to pick up extra shares in Nordic American Offshore, it announced today.

In a statement NAT said it bought 198,624 shares in the PSV owner at $12.89 each.

This took its holding from 17.1% to 18%, with its 4,207,388 shares worth $54.23m at the latest purchase price.

NAO, which has 10 PSVs including newbuildings, has been boosting its parent of late - with $1.8m