CSUB

What CSUB does

CSUB AS is a Norwegian privately held engineering and fabrication company headquartered in Arendal, Norway, founded in 2003 (with predecessor composite deliveries dating to 1992). The company designs, engineers, and manufactures Glass Fibre Reinforced Polymer (GRP) subsea structures for the global offshore energy industry, organized into two product families: Support Structures (sleepers, buckling initiators, crossings and bridges, pipeline freespan correction, foundations, J-tube ramps) and Protection Systems (pipeline and spool protection covers, subsea production systems, hatches, and cable protection). Manufacturing relies on a proprietary vacuum infusion process achieving approximately 70% fiber volume fraction, with engineering analysis supported by FEM and CFD capabilities and reference to DNV and NORSOK standards.

The business operates an EPC supplier model, with revenue generated from custom-engineered, project-based contracts priced against specifications and complexity. Sales are driven through direct enterprise engagement with EPCI contractors (Subsea7, TechnipFMC, Saipem, Ocean Installer, McDermott) and operators (Aker BP, Equinor, Shell Sarawak, Petronas affiliate Carigali Sdn Berhad), supplemented by frame agreements and long-term relationships. Production is conducted at owned facilities in Arendal/Eydehavn (Norway) and Klaipeda (Lithuania), with a manufacturing partnership established in 2024 in Doha, Qatar via Qatar Shipyard Technology Solutions. CSUB has completed more than 500 deliveries across the Norwegian Continental Shelf, Middle East, West Africa, South America, and Southeast Asia, and reports 51-100 employees.

Beyond the core offshore energy business, CSUB operates the HighComp brand for land-based and marine aquaculture (fish tanks, LESS-STRESS bridges, water treatment tanks) and CSUB Civil for bridges and swimming pools in civil engineering applications. The group is privately held with no disclosed external institutional investment, holds ISO 9001, ISO 14001, and ISO 45001 certifications, is Achilles JQS qualified for the Norwegian and Danish oil industry, and has been a UN Global Compact member since 2021.

Name

CSUB

Legal name

CSUB AS

Website

https://csub.com

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

51–100 employees

Ownership category

akta.pro rank

Product category

Composite Subsea Structures

NAICS

Oil and Gas Field Machinery and Equipment Manufacturing (333132)

SIC

Oil & Gas Field Machinery & Equipment (3533)

akta.pro primary industry

FRP/GRP & Composite Materials (Resins, Fibers, Core Materials) (IMAJAKAC)

akta.pro secondary industry

Offshore Wind Substructures & Marine Engineering (Monopiles, Jackets, Floating) (EUAMACAE)

Keywords

• Composite subsea structures
• GRP fabrication
• Subsea protection systems
• Offshore pipeline supports
• EPC composite supplier

Headquarters

HQ city

Arendal

HQ country

Norway

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. EPC - Engineering, Procurement & Fabrication: Full EPC supplier model where CSUB designs, engineers, and fabricates custom GRP subsea structures for client projects. Revenue is generated through project-based contracts for custom-engineered composite structures including support structures and protection systems.
2. Custom Product Sales: Direct fabrication and delivery of GRP subsea products including sleepers, crossings, bridges, foundations, protection covers, and cable protection systems. Pricing based on project specifications and complexity.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

CSUB designs, engineers, and manufactures Glass Fibre Reinforced Polymer (GRP) composite subsea structures for the offshore energy industry. Its offerings fall into two product families — Support Structures (sleepers, buckling initiators, crossings, bridges, pipeline freespan correction, foundations, and J-tube ramps) and Protection Systems (subsea protection covers, subsea production systems, subsea hatches, and cable protection). The company operates as a full EPC (Engineering, Procurement, and Fabrication) supplier, delivering custom-engineered, non-metallic structures to offshore projects worldwide.

Product overview

CSUB develops and manufactures Glass Fibre Reinforced Polymer (GRP) subsea structures for the energy industry, organized into two main product categories: Support Structures and Protection Systems. Support Structures include Subsea Sleepers, Buckling Initiators, Crossings & Bridges, Pipeline Freespan Correction systems, Foundations, and J-Tube Ramps. Protection Systems encompass Subsea Protection Covers, Subsea Production Systems (SPS), Subsea Hatches, and Subsea Cable Protection solutions. All products are custom-engineered using non-metallic composite materials that are 50-70% lighter than steel, with a 50+ year design life and resistance to corrosion.

Differentiator

Problem solved

Functional benefit

Products and services

• Subsea Sleepers & Buckling Initiators
• Subsea Crossings & Bridges
• Pipeline Freespan Correction
• Subsea Foundations
• J-Tube Ramp
• Subsea Protection Covers
• Subsea Production Systems (SPS)
• Subsea Hatches
• Subsea Cable Protection

Quantifiable outcome

• 50-70% weight reduction compared to steel (SG 2.0 vs 7.8)
• +6 more outcomes

Named customers9 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered core and minor.

• Qatar Shipyard Technology SolutionscoreStrategic or Co-development Partner · 1 January 2024Partnership agreement for local production of GRP structures in Qatar. Marks CSUB's first agreement for GRP production in the Middle East. The partnership enables shorter delivery times for Middle East clients, improved local content performance, and proximity to regional customers. Production site being planned in Doha with initial production demonstrated to clients.
• CivittaminorStrategic or Co-development PartnerSustainability partnership for carbon footprint assessment and analysis. Civitta conducted detailed analysis measuring total carbon footprint across CSUB Group, concluding 2023 emissions at 10,824 tons CO2eq.

Scale indicators7 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Advanced Insulation Systems (AIS): UK manufacturer of subsea thermal insulation and protection covers for offshore pipelines and equipment. Closely comparable product range to CSUB's subsea protection covers and SPS portfolio, serving the same EPCI contractor customer base.
• Matrix Composites: US-based manufacturer of composite subsea buoyancy modules and engineered structures for offshore oil & gas and renewables. Direct competitor in composite subsea hardware, with comparable vacuum-infusion and syntactic foam product capabilities.
• Tekmar Group: UK-based provider of subsea cable protection systems and engineered products for offshore wind and oil & gas markets. Direct competitor in CSUB's J-tube ramp and cable protection categories, particularly for offshore wind turbine and substation applications.
• Balmoral: Aberdeen-based manufacturer of composite subsea buoyancy, protection and foundation products for the offshore energy industry. Closest direct competitor to CSUB's subsea protection and support structure portfolio, serving the same EPCI contractors and operators.
• Subsea Innovation: UK-based designer and manufacturer of subsea protection structures, covers and intervention equipment for the offshore energy industry. Directly overlaps with CSUB's protection cover and structural product lines sold to the same North Sea and global EPCI customers.

Regional players

• Strongwell: US-based manufacturer of pultruded and molded FRP structural products for construction, infrastructure and industrial markets. Comparable composite materials, processes and product form factors to CSUB's civil and structural offerings, but focused on North American onshore applications.
• Fiberline Composites: Denmark-based manufacturer of pultruded GRP composite profiles for construction, wind and infrastructure applications. Comparable composite materials and manufacturing approach to CSUB, with overlap in CSUB Civil bridge and structural applications but primarily serving European onshore markets.

Broad incumbents

• Trelleborg: Sweden-headquartered global polymer engineering group with a dedicated offshore division producing buoyancy, cable protection, bend stiffeners and sealing products. Overlaps directly with CSUB's portfolio but as part of a much larger industrial conglomerate serving broader markets.

Emerging players

• Strohm: Netherlands-based developer of thermoplastic composite pipe (TCP) for offshore oil & gas and renewables. Competes with traditional subsea steel pipe and adjacent to CSUB's GRP composite structures; an emerging alternative technology targeting the same offshore infrastructure opportunity.
• Magma Global: UK-based manufacturer of m-pipe carbon fiber composite pipe for offshore risers and flowlines. Represents an emerging composite technology competing for the same offshore pipeline and structural applications where CSUB's GRP products are specified.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/profile.php?id=61551581346931
• LinkedInlinkedin.com/company/csub

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Subsidiaries1 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 CSUB