Stemat Marine Services

What Stemat Marine Services does

Stemat Marine Services is a Dutch maritime services company headquartered in Rotterdam that operates specialized floating equipment for the offshore energy sector, including a cable-laying vessel and a fleet of multi-purpose vessels. The company was acquired by Royal Boskalis Westminster N.V. in July 2016 as part of Boskalis' purchase of offshore-related activities from VolkerWessels, alongside VBMS and VSI, and has since been integrated into Boskalis' dredging and offshore fleet. Its vessels primarily support subsea cable installation and related marine services for the offshore wind energy market, positioning Stemat within the Subsea Cables and Marine Services activities of the Boskalis Offshore Energy division.

The company's commercial offering is built around domain-specialized maritime assets rather than proprietary software or recurring service contracts at the standalone entity level. Stemat is presented on the Boskalis corporate website as a sub-brand with its own product page, but it does not operate independent pricing, public customer disclosures, or separate financial reporting. All revenue generated by Stemat's vessel operations is consolidated within Boskalis' offshore energy segment, and the parent itself was taken private in November 2022 when HAL Investments acquired 98.3% of Boskalis shares at EUR 33.00 per share, ending the Euronext Amsterdam listing.

Stemat's business model is therefore best characterized as a vessel-operating sub-brand whose commercial framework is governed entirely by its parent. Customer relationships, contract bidding, and project execution are run through Boskalis, with Stemat contributing specialized tonnage and operational capability to larger integrated offshore wind and subsea contracts. The company has only 21 reported employees, reflecting its role as a lean operational unit absorbed into a much larger global maritime services platform rather than a standalone enterprise.

Name

Stemat Marine Services

Legal name

Stemat

Website

https://stemat.com

Company type

Private

Operating status

Operating

Headcount range

11–50 employees

Short description

Stemat Marine Services is a Rotterdam-based maritime services firm that operates a cable-laying vessel and multi-purpose vessels for offshore wind energy projects. It operates as a wholly-owned sub-brand of Royal Boskalis Westminster N.V., following acquisition from VolkerWessels in July 2016.

Ownership category

akta.pro rank

Product category

Offshore Maritime Services

NAICS

Support Activities for Water Transportation (4883), Ship Building and Repairing (336611)

SIC

Ship & Boat Building & Repairing (3730)

akta.pro primary industry

Marine & Offshore Wind BOP Construction (Foundations, Cables, Ports, Installation Support) (EUAMAFAI)

akta.pro secondary industries

Offshore Wind Substructures & Marine Engineering (Monopiles, Jackets, Floating) (EUAMACAE), Retrofits, Upgrades & Compliance Conversions (Scrubbers, BWTS, Alternative Fuels, Energy-Saving Devices) (TLAHAMAI)

Keywords

• Offshore marine services
• Cable-laying vessels
• Offshore wind support
• Multi-purpose vessels
• Subsea cable installation

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure

Core offering

Stemat Marine Services is a maritime service company that provides specialized floating equipment and vessels, including a cable-laying vessel and multi-purpose vessels, for the offshore wind energy market. Following its acquisition by Boskalis in July 2016, the Stemat fleet has been integrated into Boskalis' dredging and offshore fleet and is operated as a sub-brand within the Boskalis Group.

Product overview

Stemat Marine Services is a maritime service company that operates as a sub-brand within the Boskalis Group. It provides specialized floating equipment and vessels, including cable-laying vessels and multi-purpose vessels, primarily serving the offshore wind energy market. Following its acquisition by Boskalis in July 2016, Stemat's fleet has been integrated into Boskalis' broader dredging and offshore operations.

Differentiator

Problem solved

Functional benefit

Products and services

• Maritime services for offshore wind energy (cable-laying and multi-purpose vessel operations) Maritime services providing specialized floating equipment — including a cable-laying vessel and multi-purpose vessels — for offshore wind farm installation and maintenance. Targeted at offshore wind developers, EPC contractors, and offshore energy operators seeking cable-laying and vessel support for renewable energy projects.

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Recent moves4 records

Expansion highlights3 records

Direct peers

• Subsea 7: Global subsea engineering and construction contractor with offshore wind and subsea cable capabilities. Competes for similar offshore EPCI scopes and operates comparable tonnage.
• NKT A/S: Danish cable manufacturer and owner/operator of cable-lay vessels (e.g., NKT Victoria) for offshore wind high-voltage cable projects. Direct peer in submarine cable installation services.
• Jan De Nul Group: Belgian marine contractor operating cable-lay and multi-purpose offshore vessels for offshore wind and inter-array cable installation. Direct competitor to Stemat's cable-lay service line.
• DEME Group: Belgium-based dredging and offshore contractor with significant offshore wind and subsea cable installation work. Competes directly for the same offshore wind EPCI scopes as Stemat.
• Van Oord: Dutch-headquartered marine contractor with major offshore wind installation and cable-lay capabilities. Highly comparable to Stemat/Boskalis in the North Sea offshore wind EPCI market.
• Prysmian Group: World's largest cable manufacturer with a growing fleet of cable-lay vessels (e.g., Leonardo da Vinci) for offshore wind export and inter-array cables. Competes with Stemat on cable installation services.
• Seaway 7 (Subsea 7 renewables arm): Subsea 7's offshore wind EPCI unit operating cable-lay and heavy-lift vessels. Directly competes with Stemat for offshore wind cable installation contracts in Europe and globally.

Others

• VolkerWessels (offshore division): The Dutch construction group that previously owned Stemat before divesting its offshore activities to Boskalis in 2016. Relevant as the prior owner and former operator of the same cable-lay vessel.

Broad incumbents

• Royal Boskalis Westminster N.V. Stemat's parent and a global maritime services leader with dredging, offshore wind, and subsea operations. Provides the broader platform in which Stemat's vessels are deployed and competes for the same scopes.

Emerging players

• Hellenic Cables: Greek submarine cable manufacturer and installer with growing offshore wind exposure. A partial peer in cable-lay capability and offshore wind supply chain participation.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights4 records

Customer concentration

• LinkedInlinkedin.com/company/stemat-marine-services

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Stemat Marine Services