Company lists · Data refreshed September 2026

Top 25 Underwater infrastructure companies based in Norway

Name: Underwater infrastructure companies based in Norway
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 70 companies tracked

RevenueBase identified 70 underwater infrastructure companies headquartered in Norway as of September 2026 and tracks 2,823 professional contacts across them, including 1,021 with verified work emails. Oslo is the largest hub.

This list covers underwater infrastructure companies 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 22, 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 22, 2026 86% judged on-target in blind review

70Companies

2,823Contacts tracked

1,021Verified emails

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The 25 largest underwater infrastructure companies based in Norway

Ranked by team size

Top 25 of 70 underwater infrastructure companies based in Norway, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to underwater infrastructure companies: 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	Global Maritime	Indirect evidence	Stavanger, NorwayHQ checked Sep 22, 2026	201-500	472 contacts →
	Indirect evidence “Global Maritime delivers integrated marine solutions for a changing offshore world.” Source: RevenueBase Database · checked Sep 22, 2026
2	Höegh EVI	Indirect evidence	Oslo, NorwayHQ checked Sep 22, 2026	501-1,000	437 contacts →
	Indirect evidence “Höegh Evi is the vital link to secure transition-delivering fast, adaptable, and secure solutions that respond to countries’ evolving energy needs.” Source: RevenueBase Database · checked Sep 22, 2026
3	Ocean Installer	Indirect evidence	Stavanger, NorwayHQ checked Sep 22, 2026	201-500	299 contacts →
	Indirect evidence “Ocean Installer is a leading marine construction company that specializes in offshore installation services with more than 15 years of experience delivering large and complex…” Source: RevenueBase Database · checked Sep 22, 2026
4	Akofs Offshore	Indirect evidence	Oslo, NorwayHQ checked Sep 22, 2026	201-500	233 contacts →
	Indirect 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 22, 2026
5	Imenco	Indirect evidence	Aksdal, NorwayHQ checked Sep 22, 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 22, 2026
6	Havila Subsea & Renewables	Indirect evidence	Aalesund, NorwayHQ checked Sep 22, 2026	201-500	120 contacts →
	Indirect 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 22, 2026
7	Abyss AS	Indirect evidence	Kristiansund, NorwayHQ checked Sep 22, 2026	201-500	84 contacts →
	Indirect evidence “Abyss utfører alle tjenester på sjøen - over og under vann.” Source: RevenueBase Database · checked Sep 22, 2026
8	Moss Maritime	Indirect evidence	Lysaker, NorwayHQ checked Sep 22, 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 22, 2026
9	Ulefos Norge	Indirect evidence	Ulefoss, NorwayHQ checked Sep 22, 2026	201-500	59 contacts →
	Indirect evidence “Ulefos er et ledende nordisk selskap innen vannindustrien etablert i 1657, med over 300 ansatte i Norge, Sverige, Finland og Danmark.” Source: RevenueBase Database · checked Sep 22, 2026
10	Subseadesign AS	Indirect evidence	Lierbyen, NorwayHQ checked Sep 22, 2026	51-200	47 contacts →
	Indirect 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 22, 2026
11	Subseapartner AS	Indirect evidence	Haugesund, NorwayHQ checked Sep 22, 2026	11-50	44 contacts →
	Indirect evidence “SubseaPartner is a leading diving contractor in the shallow-deep segment.” Source: RevenueBase Database · checked Sep 22, 2026
12	Swire Seabed	Indirect evidence	Bergen, NorwayHQ checked Sep 22, 2026	51-200	40 contacts →
	Indirect 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 22, 2026
13	Innova	Partial evidence	Sandnes, NorwayHQ checked Sep 22, 2026	51-200	38 contacts →
	Partial evidence “Established in 1997, Innova is a leading supplier of services, equipment and solutions to the international underwater industry.” Source: RevenueBase Database · checked Sep 22, 2026
14	Envirex AS	Indirect evidence	Bryne, NorwayHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect 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 22, 2026
15	Techno Dive	Indirect evidence	Avaldsnes, NorwayHQ checked Sep 22, 2026	11-50	25 contacts →
	Indirect evidence “Techno Dive is your partner for Safe and Efficient Subsea Work.” Source: RevenueBase Database · checked Sep 22, 2026
16	Wellpartner AS	Indirect evidence	Tananger, NorwayHQ checked Sep 22, 2026	51-200	23 contacts →
	Indirect evidence “WellPartner AS is a service company that delivers technical expertise and high quality equipment and services within subsea drilling, completion and intervention operations.” Source: RevenueBase Database · checked Sep 22, 2026
17	Stinger Technology AS	Partial evidence	Stavanger, NorwayHQ checked Sep 22, 2026	11-50	23 contacts →
	Partial evidence “Stinger Technology AS is an innovative solution provider focusing on underwater wells monitoring, seabed surveys and jacket inspections.” Source: RevenueBase Database · checked Sep 22, 2026
18	Sjøentreprenøren AS	Indirect evidence	Bergen, NorwayHQ checked Sep 22, 2026	11-50	22 contacts →
	Indirect evidence “Vi utfører oppdrag innen mudring, sprenging, riving, konstruksjon, inspeksjon og mye mer under vann.” Source: RevenueBase Database · checked Sep 22, 2026
19	Submara Prosjekt AS	Indirect evidence	Tofte, NorwayHQ checked Sep 22, 2026	11-50	21 contacts →
	Indirect evidence “Dykkerteknikk AS ble etablert i 1976 og er et godt etablert selskap innen undervannsarbeid og marine operasjoner.” Source: RevenueBase Database · checked Sep 22, 2026
20	Kvenna	Indirect evidence	Ålesund, NorwayHQ checked Sep 22, 2026	11-50	21 contacts →
	Indirect evidence “Kvenna is located in the beautiful city of Aalesund, Norway.” Source: RevenueBase Database · checked Sep 22, 2026
21	Deep C	Indirect evidence	Kristiansund, NorwayHQ checked Sep 22, 2026	11-50	21 contacts →
	Indirect evidence “Deep C provides Seabed Intervention Services that simply fit together.” Source: RevenueBase Database · checked Sep 22, 2026
22	Fsubsea	Indirect evidence	Oslo, NorwayHQ checked Sep 22, 2026	11-50	20 contacts →
	Indirect evidence “FSubsea is a Norwegian ocean technology company focused on climate-smart subsea desalination systems, as well as robust subsea pumping systems for a variety of energy and green…” Source: RevenueBase Database · checked Sep 22, 2026
23	Unitech Energy Group	Indirect evidence	Bergen, NorwayHQ checked Sep 22, 2026	51-200	18 contacts →
	Indirect evidence “For over 35 years, oil companies have relied on UNITECH Energy Group to help them improve the safety, reliability and efficiency of their subsea systems.” Source: RevenueBase Database · checked Sep 22, 2026
24	Valen Marina AS	Indirect evidence	Kolltveit, NorwayHQ checked Sep 22, 2026	11-50	18 contacts →
	Indirect evidence “Valen Marina AS er en sjøentreprenør som har sitt virke innenfor dykke- og ROV tjenester.” Source: RevenueBase Database · checked Sep 22, 2026
25	Submara	Indirect evidence	Sætre, NorwayHQ checked Sep 22, 2026	201-500	13 contacts →
	Indirect evidence “Som en av Norges ledende aktører innen undervanns- og dykkertjenester kan vi levere hele spekteret av undervannstjenester nasjonalt og internasjonalt.” Source: RevenueBase Database · checked Sep 22, 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: underwater infrastructure companies. 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 underwater infrastructure companies.
Partial evidence: Its own public description names part of underwater infrastructure companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name underwater infrastructure companies. 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 70 underwater infrastructure companies based in Norway

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Underwater infrastructure companies based in Norway at a glance

As of Sep 22, 2026

36.2%Verified-email coverage

40.3Average contacts per company

11-50Median size (employees)

12.9%Largest-city concentration · Oslo

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

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 70 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 underwater infrastructure companies, 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 “underwater infrastructure companies”. 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 underwater infrastructure companies), 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 underwater infrastructure companies, 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, 1,021 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 22, 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 underwater infrastructure companies, 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 underwater infrastructure companies are there based in Norway?

RevenueBase identified 70 underwater infrastructure companies 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?

Global Maritime, headquartered in Stavanger, tops this list with the largest team on record.

Which city has the most underwater infrastructure companies?

Oslo leads with 9 headquartered companies, followed by Stavanger (6) and Bergen (4).

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 1,021 verified decision-maker contacts tracked across these 70 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 22, 2026.

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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.