Subsea 7

What Subsea 7 does

Subsea 7 S.A. is a Luxembourg-domiciled, Oslo Børs-listed offshore engineering, procurement, construction and installation (EPCI) contractor serving the global energy industry. Founded in its current form in 2002 from a DSND/Halliburton joint venture and reshaped by the 2011 merger with Acergy, the company operates a fleet of pipelay, construction, heavy-lift, survey and ROV vessels supported by spoolbases, fabrication yards and project management offices across more than 30 countries, employing approximately 15,000 people. Its core offering is the integrated delivery of SURF (subsea umbilicals, risers and flowlines) projects for major international oil companies and national oil companies such as Petrobras, ExxonMobil, Chevron, BP, Equinor, ConocoPhillips, Woodside and Vår Energi, alongside inspection, repair and maintenance (IRM), life-of-field and decommissioning services.

The company's revenue model is project-based, with contract values ranging from $50M (sizeable) to over $1.25B (supermajor), spanning two-to-four-year execution cycles. Subsea7 also operates the Seaway7 renewables business unit for offshore wind installation (cumulative ~15.8 GW supported by end-2024) and runs autonomous subsidiaries Xodus (engineering) and 4Subsea (data analytics). Strategic alliances include the OneSubsea joint venture with SLB and Aker Solutions and the Subsea Integration Alliance, both targeting integrated SPS-SURF delivery. The company is also pursuing emerging energy services in carbon capture and storage (Northern Lights project) and offshore hydrogen.

Subsea7 generated $7.1B of revenue in FY2025 with $1.48B adjusted EBITDA (21% margin, 36% YoY growth) and ended the year with a record $13.8B backlog. It is engaged in a proposed 50:50 merger with Saipem S.p.A. to create Saipem7 (target close H2 2026, ~€21B combined revenue, ~€43B backlog, €300M synergies), with Brazil's CADE having granted unconditional antitrust approval in June 2026.

Name

Subsea 7

Legal name

Subsea 7 S.A.

Website

https://subsea7.com

Company type

Public

Founded year

2002

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

Subsea 7 is a Luxembourg-domiciled, Oslo-listed offshore EPCI contractor delivering SURF projects, vessel-based installation, IRM and renewables services to major international and national oil companies across 30+ countries, with FY2025 revenue of $7.1B and a $13.8B backlog.

Ownership category

akta.pro rank

Product category

Subsea Engineering and Offshore EPCI Services

NAICS

Oil and Gas Field Machinery and Equipment Manufacturing (333132), Ship Building and Repairing (336611)

SIC

Oil & Gas Field Machinery & Equipment (3533), Ship & Boat Building & Repairing (3730)

akta.pro primary industry

Subsea Services & Equipment (Subsea Trees, Umbilicals, Installation, IMR) (EUALABAI)

akta.pro secondary industries

Offshore Wind Substructures & Marine Engineering (Monopiles, Jackets, Floating) (EUAMACAE), Subsea Construction & IMR Vessel Newbuilds (CSV, DSV, ROV Support) (IMAJACAD)

Keywords

• Subsea engineering services
• Offshore EPCI contracts
• SURF installation services
• Offshore wind installation
• Subsea inspection maintenance

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices6 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Operations, Personnel, Infrastructure, Supply Chain, Technology or R&D, Marketing or Sales

Revenue model

1. EPCI Contracts: Engineering, Procurement, Construction and Installation contracts for subsea offshore projects. Revenue recognized over project lifecycle typically spanning 2-4 years. Contract values range from $150M-$300M (substantial) to over $1.25B (supermajor).
2. Offshore Services: Inspection, Repair and Maintenance (IRM) services, life of field services, and decommissioning support. Typically shorter-cycle engagements complementing large project work.
3. Renewables Installation: Offshore wind installation services through Seaway7, including foundation installation, turbine installation, and cable lay operations.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels9 records

Core offering

Subsea 7 delivers engineered offshore projects and services for the global energy industry, covering subsea umbilicals, risers and flowlines (SURF) EPCI, inspection/repair/maintenance (IRM), life-of-field services, and decommissioning. The company also installs offshore wind foundations, turbines and cables through its Seaway7 business unit, and sells proprietary enabling products such as EHTF flowlines, deepwater risers and modular structures.

Product overview

Subsea 7 is a global leader in offshore projects and services for the energy industry, operating as a single unified service provider rather than a platform-plus-modules architecture. The company offers a comprehensive portfolio spanning: (1) Subsea and Conventional services including SURF (Subsea Umbilicals, Risers, and Flowlines) EPCI, inspection/repair/maintenance (IRM), life-of-field services, and decommissioning; (2) Renewables and Emerging Energies through Seaway7 subsidiary for offshore wind installation, plus Carbon Capture and Storage and Hydrogen initiatives; (3) Enabling Products including Flowlines (with EHTF thermal mitigation), Risers, and Structures. The portfolio is supported by autonomous subsidiaries Xodus (engineering) and 4Subsea (data analytics), strategic alliances including Subsea Integration Alliance with SLB OneSubsea and OneSubsea joint venture (with Aker Solutions and SLB), and regional joint ventures in Nigeria, Angola, Ghana, Equatorial Guinea, and Malaysia. Recent major contracts include Sépia 2 in Brazil ($1.25B+), Goliat Gas Export in Norway ($150-300M), Likembe in Angola ($150-300M), and Sakarya in Turkey ($300-500M). The company is pursuing a merger with Saipem to create 'Saipem7' expected to close H2 2026.

Differentiator

Problem solved

Functional benefit

Brands

• Seaway7: Offshore wind installation business unit of Subsea7 Group offering foundation, turbine installation, cable lay, and transportation services
• Xodus
• 4Subsea

Products and services

• SURF (Subsea Umbilicals, Risers and Flowlines) EPCI
• Inspection, Repair and Maintenance (IRM)
• Flowline Systems
• Riser Systems
• Modular Subsea Structures
• Seaway7 Offshore Wind Installation
• Carbon Capture and Storage (CCS) Services
• Offshore Hydrogen Solutions
• Xodus Engineering Services
• 4Subsea Decision Support and Analytics
• Subsea Integration Alliance (Integrated SPS-SURF)
• OneSubsea Subsea Technology and Solutions

Quantifiable outcome

• 35GW cumulative power capacity of renewables projects supported by 2030 (18GW by 2025)
• +5 more outcomes

Named customers14 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

15 partnerships are on record, tiered supporting, major, core and regional.

• Envirex GroupsupportingTechnology or Integration · 11 May 2026OneSubsea (SLB/Aker Solutions/Subsea7 JV) completed acquisition of the subsea business of Norwegian Envirex Group to support development of next-generation subsea solutions including umbilical-less and wireless systems.
• PETRONAS SurinamemajorStrategic or Co-development Partner · 7 April 2026Subsea Integration Alliance signed strategic collaboration agreement with PETRONAS Suriname E&P for field development projects in Suriname's frontier basin. Establishes long-term framework for pre-FEED, FEED and EPCIC solutions.
• OneSubsea (SLB, Aker Solutions, Subsea7 JV)coreStrategic or Co-development Partner · 1 January 2023OneSubsea is a joint venture established in 2023 by SLB (formerly Schlumberger), Aker Solutions, and Subsea7 to create a world-leading subsea technology and solutions provider. The joint venture combines subsea production systems (SPS) and SURF capabilities for integrated project delivery.
• Subsea Integration AlliancecoreStrategic or Co-development PartnerStrategic partnership between Subsea7 and SLB OneSubsea providing integrated SPS-SURF solutions to clients. Enables standardisation and optimisation of systems across the full subsea spectrum.
• Aker BPmajorStrategic or Co-development PartnerStrategic partnership with Aker BP in Norway for subsea projects on the Norwegian Continental Shelf, working as an alliance to facilitate standardisation and optimisation.
• Global Oceon (Nigeria)regionalStrategic or Co-development PartnerJoint venture in Lagos providing multi-disciplinary engineering services for offshore oil and gas projects in Nigeria.
• Sonamet (Angola)regionalStrategic or Co-development PartnerJoint venture in Angola operating the Lobito fabrication yard, providing construction services for shallow and deep water projects off the coast of Angola.
• Subsea 7 Volta Contractors and Belmet 7 (Ghana)regionalStrategic or Co-development PartnerJoint ventures in Ghana providing EPCI and IMR project support and execution, with Belmet 7 operating a fabrication yard in Takoradi supporting onshore and offshore oil and gas projects.
• Subsea 7 Equatorial GuinearegionalStrategic or Co-development PartnerJoint venture developed to provide life of field services and SURF and conventional projects for the oil and gas industry offshore Equatorial Guinea.
• Subsea 7 MalaysiaregionalStrategic or Co-development PartnerJoint venture established to provide EPCI services to the oil and gas industry in Malaysia.
• Seaway7coreStrategic or Co-development PartnerSeaway7 is a business unit within Subsea7 Group and a leader in offshore wind installation, offering foundation installation, turbine installation, cable lay and transportation services.
• XodussupportingStrategic or Co-development PartnerAutonomous Subsea7 subsidiary supporting clients with independent engineering solutions to reduce carbon footprint and optimise field development plans.
• 4SubseasupportingStrategic or Co-development PartnerAutonomous Subsea7 subsidiary delivering critical decision support to energy providers through domain expertise, data analytics and digital services to maximise asset lifetime and reduce operational cost.
• EnerMechregionalImplementation/ SI/ Consulting PartnerEnerMech was contracted by Subsea7 to deliver pipeline flushing and cleaning workscope as part of field decommissioning program in Gulf of Mexico.
• ABL Energy & Marine Consultants BrasilregionalImplementation/ SI/ Consulting PartnerABL appointed as Marine Warranty Surveyor (MWS) to support Subsea7 with transportation and installation of subsea SURF infrastructure for FPSO units at the Mero field in Brazil.

Scale indicators11 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Boskalis: Dutch marine services major with offshore wind, subsea cable lay and heavy-lift capabilities that overlap Subsea7/Seaway7's renewables and SURF install scopes.
• Helix Energy Solutions: US-based subsea well intervention and field services company competing for IRM and life-of-field scopes on Gulf of Mexico and Brazilian deepwater assets.
• Jan De Nul: Luxembourg-based offshore contractor with strong offshore wind installation and subsea cable-lay presence — directly comparable to Seaway7's renewables installation offering.
• DOF Subsea: Norwegian subsea IMR, SURF and offshore vessel operator competing for inspection, repair and maintenance contracts — the same life-of-field revenue stream Subsea7 pursues via Equinor frame agreements.
• DeepOcean: Netherlands-based subsea services company competing for SURF installation, IMR and trenching contracts across the North Sea and Atlantic margins.
• Van Oord: Dutch offshore contractor and key competitor to Seaway7 in foundation, cable-lay and turbine installation for European offshore wind farms.
• Saipem: Italian offshore E&C major competing head-to-head in SURF EPCI tendering across Brazil, West Africa, Mediterranean and the Middle East; designated merger partner under the Saipem7 combination announced mid-2025.
• TechnipFMC: Dual-listed subsea EPCI and SPS provider — closest direct comp on the SPS-SURF integrated offering that Subsea7's OneSubsea JV is designed to match.
• McDermott: Houston-based offshore EPCI competitor active across the same deepwater basins (Gulf of Mexico, Brazil pre-salt, Asia-Pacific) with comparable SURF project delivery capability.
• Aker Solutions: Norwegian subsea and engineering peer; co-owner of the OneSubsea JV with Subsea7 and SLB, and a direct competitor on Norwegian Continental Shelf subsea contracts.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/subsea7official
• YouTubeyoutube.com/channel/UCRI019_bpxv_oKeLyQ-icKA
• Facebookfacebook.com/subsea7official
• LinkedInlinkedin.com/company/subsea-7
• Instagraminstagram.com/subsea7official

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Subsidiaries10 records

Funding overview

Funding rounds

Investors

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

M&A5 records

Investments

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

Frequently asked questions about Subsea 7