What FSubsea does

FSubsea AS is a Norwegian private limited company headquartered in Oslo that designs and manufactures subsea pumping systems for the offshore energy and water industries. Founded in 2013 as a de-merger from the Fuglesangs family industrial group (with roots in pump systems dating to 1982), the company has supplied more than 90 deep-sea pumping systems to large global subsea service companies and energy majors. Its portfolio spans seven product lines built around a proprietary seal-less magnetic coupling platform: Omnirise (permanent subsea process pumps in HydroMag, Mag, and HiDi variants), Searise (heavy-duty seawater and trenching pumps for ROVs and cable-laying tools), Mudrise (subsea slurry lift and circulation systems), FASTsubsea X (a topside-less multiphase boosting system co-developed with Aker Solutions as a joint venture), Mag 2000 (magnetic couplings for ammonia, hydrogen, CO2, and refinery service), Flocean (subsea desalination using natural ocean-column pressure), and Digital Solutions (Birdseye AI monitoring, Digital Twin, and SubProx sensors).\n\nThe company generates revenue primarily through enterprise project-based sales of engineered hardware systems, with pricing handled through bespoke quotes rather than published list prices. A dedicated Sales Manager and Key Account Management function targets enterprise buyers in oil & gas subsea boosting, subsea cable infrastructure (offshore wind and inter-country HV links), dredging and excavation, and — most recently — water desalination. Engineering, repair, upgrade, and full-load testing services (up to 2750 kW at 6600V) are delivered from a single Oslo facility equipped with an indoor 6-meter subsea test pit and 25-ton gantry crane. FSubsea is majority-owned by the Fuglesangs family through G.R. Fuglesangs Sønner AS, with additional investors including Freebird Partners LP, VIND, Hatteland Group, and Skeie Group; no institutional venture or growth equity rounds are disclosed. Solfrid Kolby became CEO in January 2026, succeeding the prior leadership that had overseen the company's transition into energy-transition adjacencies including desalination, hydrogen, and carbon capture process pumping.

Name

FSubsea

Legal name

FSubsea AS

Website

https://fsubsea.com

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

11–50 employees

Short description

FSubsea AS is a Norwegian subsea pumping systems manufacturer serving offshore energy, subsea cable, dredging, and water desalination customers. It builds seal-less pumps using proprietary magnetic coupling technology across seven product lines from a single Oslo facility.

Ownership category

akta.pro rank

Headquarters

HQ city

Oslo

HQ country

Norway

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Subsea Pump Systems: Sale of proprietary subsea pumping systems including Omnirise, Searise, and Mudrise product lines for permanent subsea use, trenching, and slurry applications
2. Desalination Systems: Sale of Flocean subsea desalination plants for water-stressed coastal areas
3. Engineering Services: Bespoke engineering, repair, upgrade and testing services for subsea pumping systems from Oslo facility
4. FASTsubsea Joint Venture: Topside-less subsea multiphase boosting system developed through JV with Aker Solutions for increased oil recovery

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

FSubsea AS designs, manufactures, and supplies robust and autonomous subsea pumping systems for the offshore energy industry, including seal-less permanent subsea process pumps (Omnirise HydroMag/Mag), heavy-duty trenching and dredging pumps (Searise Deep), subsea slurry lift systems (Mudrise), topside-less multiphase boosting (FASTsubsea X JV with Aker Solutions), and subsea desalination plants (Flocean). The company also delivers bespoke engineering, repair, upgrade and testing services from its Oslo facility, including an indoor 6-meter subsea test pit.

Product overview

FSubsea provides a comprehensive portfolio of robust and autonomous subsea pumping systems, consisting of seven core product lines and supporting services. The hardware portfolio includes Flocean™ (subsea desalination using natural ocean pressure), Omnirise™ (seal-less permanent subsea pumps with magnetic coupling technology, including HydroMag®, Mag®, and HiDi® variants), Mudrise™ (subsea slurry lift and circulation systems), Searise™ (subsea seawater, trenching, and dredging pumps including Deep variants), and FASTsubsea X (topside-less multiphase boosting system developed with Aker Solutions). Supporting technology includes Magnetic Couplings (Mag 2000 — the world's most powerful magnetic coupling enabling seal-less operation), and Digital Solutions (Birdseye AI-powered monitoring, Digital Twin systems, and SubProx™ proximity sensors). Services include engineering, repair/upgrade, and testing facilities in Oslo with a 6-meter subsea test pit and 2750 kW testing capacity. The company has supplied more than 90 deep sea pumping systems to date and is involved in pioneering subsea energy infrastructure projects.

Differentiator

Problem solved

Functional benefit

Brands

• Flocean: Subsea desalination system that provides low-cost potable water or cold clean seawater harvested from deeper parts of the ocean using natural water pressure to reduce energy consumption by 30-50% compared to terrestrial SWRO facilities.
• Omnirise
• Mudrise
• Searise
• Digital Solutions
• Magnetic Couplings
• FASTsubsea

Products and services

• Flocean Subsea desalination system that uses natural ocean pressure at 300-600 meter depths to produce freshwater for water-stressed coastal communities, agriculture, and industrial processes. Capacity 7,000-8,000 m3/day per pod; size 6m x 6m x 7m; weight 50 tons; power demand 2.2-2.3 kWh/m3. Eco-friendly with no marine life damage.
• Omnirise Seal-less 'Fit & Forget' subsea pumping systems for permanent use on the seabed. Zero discharge of toxic barrier-fluid, minimal maintenance. Three variants: Omnirise HydroMag (hermetically sealed with magnetic coupling and built-in variable speed; 5000 psi casing rating), Omnirise Mag (world's first seal-less subsea process pump), and Omnirise HiDi (hermetically sealed with high pressure diaphragms). For subsea boosting in oil & gas brownfields, tie-backs, and marginal fields.
• Mudrise Subsea slurry lift and circulation systems with 16 subsea slurry units in operation and 50+ pumps overhauled/upgraded for deep seas. Generates up to 250 meter differential pressure in a single unit with capability to pump large rock particles; typical capacities up to 600 m3/hr. Applications include Plug & Abandonment, seabed clean-up, riser-less tophole drilling, managed pressure drilling, and zero discharge slurry operations.
• Searise Subsea seawater, trenching, and dredging systems. Heavy-duty centrifugal pumps for use on ROVs, trenchers, and other subsea tools. Includes Searise Deep (200M, 400M, 200S, 400S, H13, H25) variants for raw and contaminated seawater applications. Typical capacities up to 1000 m3/hr with generated pressures up to 80 bar. Used for laying HV subsea cables, connecting offshore wind farms and countries.
• FASTsubsea X World's first topside-less subsea multiphase boosting system, developed as a joint venture between Aker Solutions and FSubsea. Designed to increase oil recovery for brownfields, tie-backs, and marginal or distributed fields. Reduces capex by up to 50% by enabling subsea boosting where no topside space is available. Flowrate <600 m3/hr, development pressure <150 bar, gas volume fraction <100%, shaft power <2 MW, 6600V.
• Magnetic Couplings (Mag 2000) World's most powerful magnetic coupling system enabling seal-less operation for critical-application process pumps. Torque <3200 Nm, speed <6000 rpm, energy <2000 kW, pressure <600 bar (external-to-internal) and <200 bar (internal-to-external). Materials include Inconel 625/718 and advanced ceramics. Enables hermetically sealed pumping for ammonia, hydrogen, CO2, refinery, and other critical applications.
• Digital Solutions Suite of digital capabilities including Birdseye (AI-powered digital advisor for performance monitoring and maintenance planning with predictive analytics), Digital Twin systems for system simulation, and SubProx (subsea analog and digital proximity sensor qualified to API 17F, rated to 500 bar sensing element, immune to seawater corrosion, suitable for >25 years permanently submerged). Interfaces with legacy control and monitoring systems.
• Engineering, Repair & Upgrade, and Testing Services Bespoke engineering services for subsea pumping solutions including total development, design, troubleshooting, analysis, and optimization. Workshop with 25-ton crane capacity, 6-meter deep indoor subsea test pit (200 m3), and large test pool (220 m3) capable of full load testing up to 2750 kW at 6600V. Repair and upgrade capabilities for any submersible/subsea pump and motor brand.

Quantifiable outcome

• 30-50% reduction in energy consumption vs terrestrial SWRO plants
• +3 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature9 records

Partnerships

Three partnerships are on record, tiered core.

• Aker SolutionscoreStrategic or Co-development PartnerFASTsubsea is a joint venture between Aker Solutions and FSubsea to develop the world's first topside-less subsea multiphase boosting system called FASTsubsea X. The system enables subsea boosting at fields where no topside space is available, reducing capex by up to 50%.
• Voith TurbocoreTechnology or IntegrationPartnership for development of patented high performance magnetic coupling embedded with fluid torque converter used in Omnirise HydroMag pumps.
• FloceancoreTechnology or IntegrationFlocean is a subsea desalination solution developed by FSubsea using natural water pressure at 300-600m depth. CEO Birgitte Hjertum previously worked with Flocean before joining FSubsea. Flocean is presented as an FSubsea product/solution line.

Scale indicators12 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Aker Solutions: Norwegian subsea processing and offshore engineering major; FSubsea's JV partner in FASTsubsea and a direct competitor in subsea boosting (Aker Solutions Subsea Pump System department). Same Norwegian/Oslo ecosystem, same target customers (energy majors, subsea service cos).

Broad incumbents

• TechnipFMC: Global subsea production systems and subsea services incumbent offering integrated subsea trees, manifolds and trenching/installation solutions that overlap with FSubsea's Omnirise, FASTsubsea and Searise Deep offerings for offshore E&P and renewables customers.
• Baker Hughes: Major oilfield services and equipment provider with a subsea production systems portfolio (formerly GE Oil & Gas) that competes with FSubsea's subsea boosting and topside-less processing solutions across offshore E&P and brownfield applications.
• SLB (Schlumberger): Global oilfield services leader whose OneSubsea joint venture and WesternGeco heritage compete with FSubsea in subsea production, boosting and trenching markets; key talent source for FSubsea's management team.
• Sulzer: Swiss industrial pump and rotating-equipment manufacturer with deep process-pump expertise; comparable to FSubsea's Omnirise and Mag 2000 product lines in refinery, chemical and energy-transition applications (ammonia, hydrogen, CO2).
• Flowserve: Global pump and valve manufacturer serving oil & gas, power, water and chemical end markets; comparable to FSubsea's subsea pumps and seal-less magnetic coupling technology at the industrial-pump level.
• Xylem: Global water technology company with extensive desalination and water-treatment expertise; comparable to FSubsea's Flocean subsea desalination business as a terrestrial SWRO and water-pumping incumbent that Flocean aims to disrupt on energy and environmental footprint.

Emerging players

• KSB: German pump and valve specialist with strong industrial process-pump, energy and water-technology franchises; comparable to FSubsea's Omnirise/Mag 2000 seal-less pumps for chemical, refinery and emerging hydrogen applications.

Others

• SBM Offshore: Dutch offshore infrastructure provider of FPSOs and offshore oil & gas production systems; adjacent to FSubsea's subsea boosting and multiphase processing technology, with shared end customers (offshore operators) and complementary but non-overlapping product lines.
• Voith Turbo: German drive and coupling technology company that co-developed FSubsea's patented high-performance magnetic coupling with fluid torque converter (core IP behind Omnirise HydroMag and Mag 2000). A technology/partner peer rather than a direct competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/fsubsea

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles20 records

Subsidiaries2 records

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 FSubsea