Stemat Marine Services
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.
- Company typePrivate
- Founded-
- Headquarters—
- Headcount11–50
- GTM typeB2B
- OfferingServices
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.
Stemat Marine Services firmographics
Firmographics- 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
Stemat Marine Services industry classification
Industry- 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
Stemat Marine Services business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Infrastructure
Stemat Marine Services product offering
Product offeringCore 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.
Companies that use Stemat Marine Services
Customer profileSegments1 record
Ideal customer profiles1 record
Stemat Marine Services technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature2 records
Stemat Marine Services partnerships and signals
Strategic signalRecent moves4 records
Expansion highlights3 records
Stemat Marine Services competitors and assessment
Company assessmentDirect 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
Stemat Marine Services social profiles
Digital presenceStemat Marine Services financial estimates
Financial estimateRevenue estimate
Valuation estimate
Stemat Marine Services leadership team
Management profileNumber of profiles
Profiles1 record
Stemat Marine Services funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Stemat Marine Services M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Stemat Marine Services
What does Stemat Marine Services do?
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.
Is Stemat Marine Services a public or private company?
Stemat Marine Services is a private company. It is classified as corporate owned and is currently operating.
When was Stemat Marine Services founded?
Stemat Marine Services was founded in -1. It employs 11 to 50 people.
Who are Stemat Marine Services's main competitors?
Direct peers on record are Subsea 7, NKT A/S, Jan De Nul Group, DEME Group, Van Oord, Prysmian Group and Seaway 7 (Subsea 7 renewables arm). VolkerWessels (offshore division) is listed as an others. Royal Boskalis Westminster N.V. is listed as a broad incumbent. Hellenic Cables is listed as an emerging player.
Does Stemat Marine Services have an API?
No public API is recorded for Stemat Marine Services.
What industry is Stemat Marine Services in?
Stemat Marine Services's product category is Offshore Maritime Services. Its primary akta.pro industry code is EUAMAFAI, Marine & Offshore Wind BOP Construction (Foundations, Cables, Ports, Installation Support), with a secondary code of EUAMACAE, Offshore Wind Substructures & Marine Engineering (Monopiles, Jackets, Floating). Its NAICS code is 4883 and its SIC code is 3730.