Company lists · Data refreshed September 2026

Top 25 Subsea installation contractors based in Norway

Name: Subsea installation contractors based in Norway
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 18, 2026 130 companies tracked

RevenueBase identified 130 subsea installation contractors headquartered in Norway as of September 2026 and tracks 7,207 professional contacts across them, including 2,461 with verified work emails. Stavanger is the largest hub.

This list covers subsea installation contractors headquartered in Norway, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 18, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 18, 2026 86% judged on-target in blind review

130Companies

7,207Contacts tracked

2,461Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest subsea installation contractors based in Norway

Ranked by team size

Top 25 of 130 subsea installation contractors based in Norway, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to subsea installation contractors: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	DOF	Partial evidence	Bergen, NorwayHQ checked Sep 18, 2026	5,001-10,000	2,942 contacts →
	Partial evidence “With a multi-national workforce of over 5,700 personnel, DOF is an international group of companies which owns and operates a fleet of modern offshore/subsea vessels, with an…” Source: RevenueBase Database · checked Sep 18, 2026
2	Island Offshore	Indirect evidence	Ulsteinvik, NorwayHQ checked Sep 18, 2026	501-1,000	501 contacts →
	Indirect evidence “Island Offshore - The Island Offshore Group is a leading provider of services to the offshore industry ranging from Platform Supply, Walk-to-work and Anchor Handling to Advanced…” Source: RevenueBase Database · checked Sep 18, 2026
3	Global Maritime	Indirect evidence	Stavanger, NorwayHQ checked Sep 18, 2026	201-500	472 contacts →
	Indirect evidence “Global Maritime delivers integrated marine solutions for a changing offshore world.” Source: RevenueBase Database · checked Sep 18, 2026
4	Reach Subsea	Strong evidence	Haugesund, NorwayHQ checked Sep 18, 2026	201-500	454 contacts →
	Strong evidence “Reach Subsea ASA (“Reach Subsea”, “Reach” or “the Group”) is a prominent offshore contractor that offer high quality solutions and technology to clients in need of ocean data and…” Source: RevenueBase Database · checked Sep 18, 2026
5	Akofs Offshore	Partial evidence	Oslo, NorwayHQ checked Sep 18, 2026	201-500	233 contacts →
	Partial evidence “AKOFS Offshore is a global provider of vessel based subsea well construction and intervention services to the oil and gas industry.” Source: RevenueBase Database · checked Sep 18, 2026
6	Imenco	Indirect evidence	Aksdal, NorwayHQ checked Sep 18, 2026	201-500	199 contacts →
	Indirect evidence “Imenco is a group of companies working mainly in five main business areas: Offshore oil & gas, offshore renewables, aquaculture, marine & naval and industrial.” Source: RevenueBase Database · checked Sep 18, 2026
7	Havila Subsea & Renewables	Partial evidence	Aalesund, NorwayHQ checked Sep 18, 2026	201-500	120 contacts →
	Partial evidence “Havila Subsea & Renewables operates an advanced fleet of vessels dedicated to Diving, Offshore Inspection, Repair, and Maintenance (IRM), as well as Construction.” Source: RevenueBase Database · checked Sep 18, 2026
8	Island Drilling Company AS	Indirect evidence	Sandsli, NorwayHQ checked Sep 18, 2026	51-200	114 contacts →
	Indirect evidence “Island Drilling was established in 2006 by industry veterans and Island Offshore, the leading global player in well intervention, to build and own special purpose semi-submersible…” Source: RevenueBase Database · checked Sep 18, 2026
9	NYMO	Indirect evidence	Grimstad, NorwayHQ checked Sep 18, 2026	201-500	105 contacts →
	Indirect evidence “Nymo is a full-service engineering, procurement and construction company within the oil & gas and process industry.” Source: RevenueBase Database · checked Sep 18, 2026
10	Optime, A Halliburton Service	Partial evidence	Notodden, NorwayHQ checked Sep 18, 2026	51-200	98 contacts →
	Partial evidence “Optime, A Halliburton Service is an innovative subsea oil and gas provider focusing on cost efficient solutions specifically towards products within the well access, well…” Source: RevenueBase Database · checked Sep 18, 2026
11	Level Offshore	Indirect evidence	Haugesund, NorwayHQ checked Sep 18, 2026	51-200	78 contacts →
	Indirect evidence “Connecting Top Talent with Leading Offshore Companies.” Source: RevenueBase Database · checked Sep 18, 2026
12	Moss Maritime	Indirect evidence	Lysaker, NorwayHQ checked Sep 18, 2026	51-200	65 contacts →
	Indirect evidence “Moss Maritime provides leading technology and expertise within design and engineering services to the offshore energy sector as well as other ocean-based sectors.” Source: RevenueBase Database · checked Sep 18, 2026
13	Technip India Limited	Indirect evidence	Sandvika, NorwayHQ checked Sep 18, 2026	51-200	59 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 18, 2026
14	Agility	Partial evidence	Skien, NorwayHQ checked Sep 18, 2026	51-200	53 contacts →
	Partial evidence “A Trusted Partner in Subsea Technology.” Source: RevenueBase Database · checked Sep 18, 2026
15	Petrolink AS	Strong evidence	NorwayHQ checked Sep 18, 2026	51-200	50 contacts →
	Strong evidence “Petrolink operates platforms, subsea installations and floating production units offshore, oil and gas terminals onshore, refineries and process plants including power plants and…” Source: RevenueBase Database · checked Sep 18, 2026
16	Passer	Indirect evidence	Sandefjord, NorwayHQ checked Sep 18, 2026	201-500	48 contacts →
	Indirect evidence “PASSER is a company supplying cable handling equipment for the offshore oil & gas and renewable energy industry.” Source: RevenueBase Database · checked Sep 18, 2026
17	Subseadesign AS	Partial evidence	Lierbyen, NorwayHQ checked Sep 18, 2026	51-200	47 contacts →
	Partial evidence “SubseaDesign (SD) is an engineering, design and fabrication company providing equipment and services for the oil and gas industry.” Source: RevenueBase Database · checked Sep 18, 2026
18	Wellconnection Group	Partial evidence	Stavanger, NorwayHQ checked Sep 18, 2026	51-200	46 contacts →
	Partial evidence “WellConnection Group is the leading company within inspection, maintenance and repair services (IMR) for drilling and subsea equipment on the Norwegian Continental Shelf.” Source: RevenueBase Database · checked Sep 18, 2026
19	RTS	Indirect evidence	Åkrehamn, NorwayHQ checked Sep 18, 2026	11-50	44 contacts →
	Indirect evidence “RTS is a supplier of engineering solutions, equipment rental, product sales and personnel supply.” Source: RevenueBase Database · checked Sep 18, 2026
20	Subseapartner AS	Strong evidence	Haugesund, NorwayHQ checked Sep 18, 2026	11-50	44 contacts →
	Strong evidence “SubseaPartner is a leading diving contractor in the shallow-deep segment.” Source: RevenueBase Database · checked Sep 18, 2026
21	Swire Seabed	Partial evidence	Bergen, NorwayHQ checked Sep 18, 2026	51-200	40 contacts →
	Partial evidence “Swire Seabed provides a highly flexible range of integrated subsea services to the global Oil & Gas and renewables industries.” Source: RevenueBase Database · checked Sep 18, 2026
22	Innova	Indirect evidence	Sandnes, NorwayHQ checked Sep 18, 2026	51-200	38 contacts →
	Indirect evidence “Established in 1997, Innova is a leading supplier of services, equipment and solutions to the international underwater industry.” Source: RevenueBase Database · checked Sep 18, 2026
23	Kystdesign	Partial evidence	Aksdal, NorwayHQ checked Sep 18, 2026	51-200	37 contacts →
	Partial evidence “KYSTDESIGN delivers a wide range of products for the subsea oil- and gas industry, renewables, research and fish farming.” Source: RevenueBase Database · checked Sep 18, 2026
24	Control Cutter	Partial evidence	Tananger, NorwayHQ checked Sep 18, 2026	11-50	28 contacts →
	Partial evidence “Control Cutter is a global decommissioning full-service provider, delivering patented cutting solutions across both topside and subsea removal, wherever offshore assets reach end…” Source: RevenueBase Database · checked Sep 18, 2026
25	Envirex AS	Partial evidence	Bryne, NorwayHQ checked Sep 18, 2026	11-50	28 contacts →
	Partial evidence “Envirex’ engineering expertise delivers a wide range of products, systems and services for the subsea oil and gas industry.” Source: RevenueBase Database · checked Sep 18, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: subsea installation contractors. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names subsea installation contractors.
Partial evidence: Its own public description names part of subsea installation contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name subsea installation contractors. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 130 subsea installation contractors based in Norway

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,461 reachable decision-makers.

Free signup · no credit card

View the full list →

Subsea installation contractors based in Norway at a glance

As of Sep 18, 2026

34.1%Verified-email coverage

55.4Average contacts per company

11-50Median size (employees)

8.5%Largest-city concentration · Stavanger

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for Norway, so it is reported there. Company counts and contact totals on this page are exact for Norway, over 130 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among subsea installation contractors, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Norway whose own description of what they do matches “subsea installation contractors”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names subsea installation contractors), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among subsea installation contractors, and records with no verified work email. Companies headquartered outside Norway are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 2,461 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 18, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names subsea installation contractors, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many subsea installation contractors are there based in Norway?

RevenueBase identified 130 subsea installation contractors headquartered in Norway as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

DOF, headquartered in Bergen, tops this list with the largest team on record.

Which city has the most subsea installation contractors?

Stavanger leads with 11 headquartered companies, followed by Haugesund (8) and Oslo (8).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,461 verified decision-maker contacts tracked across these 130 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 18, 2026.

Ready to reach these companies? Verified emails and direct dials for all 130 subsea installation contractors based in Norway. Start with a free account, no credit card.

Download this list →

Related lists

Subsea installation contractors by geography

Browse the directory

Browse: Companies home · All Norway lists · All Subsea installation contractors lists · New lists

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.