We keep ports and waterways working

Marinum brings together entrepreneur-led specialists in marine contracting, commercial diving, inspection and port services. Rooted in the Nordics, growing across Europe.

One group for the whole waterline

Marinum is a group of entrepreneur-led companies serving ports, harbours and maritime infrastructure. We work with customers such as ports and harbours, shipping and transport companies, construction contractors, energy and utility companies, municipalities and national agencies.

Each company is a specialist in its field, from towage and marine assistance to commercial diving, underwater inspection and quay construction. Working together, they deliver anything from a single inspection dive to complete marine works under one contract. Our workboats, platforms and equipment are also available for rental.

More about Marinum

Above and below the surface

Eight services, one group. Customers can buy a single service or a complete solution across our companies.

Above the surface

Quay and marine construction

Piling, jetties, dolphins and quay repair.

Dredging

Maintenance dredging for ports, harbours and fairways.

Workboats, platforms and rental

Workboats, jack-ups, pontoons, heavy lifts and equipment rental.

Towage, assistance and icebreaking

Harbour towage, vessel assistance and icebreaking.

Below the surface

Commercial diving

Underwater construction, repair and maintenance by certified divers.

Inspection and survey

Underwater and structural inspections, including 3D sonar.

Cable and pipeline works

Laying, protection and repair of subsea cables and pipes.

Salvage

Recovery of vessels, equipment and objects from the water.

All services

2026

Founded

~60

Employees

Companies

Country

For entrepreneurs

Stay at the helm. Go further together.

For owners of maritime service companies, Marinum is a way to grow without giving up what you built. You keep the helm. We add the fleet, the tenders and the support to go further.

A bigger fleet behind you

Vessels, platforms, references and certifications across the group.

Tenders you could not win alone

Bid together for the large port and infrastructure contracts.

An owner with boots on the ground

Hands-on support from Celero Capital in pricing, digitalisation and AI, marketing and more.

Why entrepreneurs join Marinum

Specialists with local roots

Specialist companies with strong local roots.

About our companies

From the Gulf of Bothnia to the west coast

Our companies are based in Gävle, Stockholm and Gothenburg and work across Sweden, Scandinavia and the Baltic Sea. Select a location to see who works where.

Company headquarters
Selected customer and project locations

Select a location on the map to see which company works there.

News

August 2026

Planning marine-related work?

Tell us about your project and we will connect you with the right company in the group.