Major DOF shareholder Helge Mogster has turned down the chance to maintain his stake in the restructuring offshore support vessel (OSV) owner.

His Laco investment company has decided not to exercise its option to buy stock to keep its ownership at 40.45% in a company hit hard by the offshore shipping slump.

The option arose from a decision to demerge the shareholdings of Laco and another major investor, Norwegian tanker owner Frederik Mohn.