Optimarin has flipped to the black, making 2017 the best year in its history, as Klaveness Marine boosted its holding in the technology company.
The positive result came after Optimarin became the first manufacturer to receive US Coast Guard type-approval for its ballast water management system, in December 2016.
The Norwegian company, which has been in operation for 23 years, logged a pre-tax profit of NOK 1m ($125,000) last year, against a NOK 24m loss in 2016.
