Company lists · Data refreshed September 2026

Top 25 Underwater construction firms based in Norway

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 101 companies tracked

RevenueBase identified 101 company matches for underwater construction firms associated with Norway as of September 2026 and tracks 3,648 professional contacts across them, including 976 with verified work emails. Haugesund is the largest hub.

This list covers company matches for underwater construction firms associated with Norway, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 19, 2026 How this list was built

101Companies

3,648Contacts tracked

976Verified emails

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

The 25 largest underwater construction firms based in Norway

Ranked by team size

Top 25 of 101 company matches for underwater construction firms based in Norway, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Island Offshore	Exact match	Ulsteinvik, NorwayHQ recorded Sep 19, 2026	501-1,000	501 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2	Global Maritime	Exact match	Stavanger, NorwayHQ recorded Sep 19, 2026	201-500	472 contacts →
	Exact match “Global Maritime delivers integrated marine solutions for a changing offshore world.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	Reach Subsea	Exact match	Haugesund, NorwayHQ recorded Sep 19, 2026	201-500	454 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4	Ocean Installer	Exact match	Stavanger, NorwayHQ recorded Sep 19, 2026	201-500	299 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5	Akofs Offshore	Exact match	Oslo, NorwayHQ recorded Sep 19, 2026	201-500	233 contacts →
	Exact match “AKOFS Offshore is a global provider of vessel based subsea well construction and intervention services to the oil and gas industry.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6	Imenco	Exact match	Aksdal, NorwayHQ recorded Sep 19, 2026	201-500	199 contacts →
	Exact match “Imenco is a group of companies working mainly in five main business areas: Offshore oil & gas, offshore renewables, aquaculture, marine & naval and industrial.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7	Havila Subsea & Renewables	Exact match	Aalesund, NorwayHQ recorded Sep 19, 2026	201-500	120 contacts →
	Exact match “Havila Subsea & Renewables operates an advanced fleet of vessels dedicated to Diving, Offshore Inspection, Repair, and Maintenance (IRM), as well as Construction.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	Abyss AS	Exact match	Kristiansund, NorwayHQ recorded Sep 19, 2026	201-500	84 contacts →
	Exact match “Abyss utfører alle tjenester på sjøen - over og under vann.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	Moss Maritime	Exact match	Lysaker, NorwayHQ recorded Sep 19, 2026	51-200	65 contacts →
	Exact match “Moss Maritime provides leading technology and expertise within design and engineering services to the offshore energy sector as well as other ocean-based sectors.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10	Subseadesign AS	Exact match	Lierbyen, NorwayHQ recorded Sep 19, 2026	51-200	47 contacts →
	Exact match “SubseaDesign (SD) is an engineering, design and fabrication company providing equipment and services for the oil and gas industry.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	Subseapartner AS	Exact match	Haugesund, NorwayHQ recorded Sep 19, 2026	11-50	44 contacts →
	Exact match “SubseaPartner is a leading diving contractor in the shallow-deep segment.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	Swire Seabed	Exact match	Bergen, NorwayHQ recorded Sep 19, 2026	51-200	40 contacts →
	Exact match “Swire Seabed provides a highly flexible range of integrated subsea services to the global Oil & Gas and renewables industries.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13	Innova	Exact match	Sandnes, NorwayHQ recorded Sep 19, 2026	51-200	38 contacts →
	Exact match “Established in 1997, Innova is a leading supplier of services, equipment and solutions to the international underwater industry.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	Kystdesign	Exact match	Aksdal, NorwayHQ recorded Sep 19, 2026	51-200	37 contacts →
	Exact match “KYSTDESIGN delivers a wide range of products for the subsea oil- and gas industry, renewables, research and fish farming.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15	Techno Dive	Exact match	Avaldsnes, NorwayHQ recorded Sep 19, 2026	11-50	25 contacts →
	Exact match “Techno Dive is your partner for Safe and Efficient Subsea Work.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16	Rexor Marine AS	Exact match	Tananger, NorwayHQ recorded Sep 19, 2026	51-200	24 contacts →
	Exact match “Rexor Marine er en annerledes og spennende aktør innen arbeidsdykking, havnearbeid og bemanning i regionen.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	Samba Marin AS	Exact match	Lepsøy, NorwayHQ recorded Sep 19, 2026	11-50	24 contacts →
	Exact match “Vi leverer tjenester innen Havbruk, Offshore, Bygg- og Anlegg” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	Aquastructures AS	Exact match	Trondheim, NorwayHQ recorded Sep 19, 2026	11-50	23 contacts →
	Exact match “Aquastructures is recognized and acknowledged as an innovative and leading engineering house, establishing long term client relations, finding viable and sustainable technical…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19	Noble Installation AS	Exact match	Rudskogen, NorwayHQ recorded Sep 19, 2026	51-200	23 contacts →
	Exact match “Om NOBLE INSTALLATION AS: Heleid datterselskap av Noble AS, etablert i Vår virksomhet er innenfor marine operasjoner, offshore installasjon, mekanisk montasje og produksjon.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	Stinger Technology AS	Exact match	Stavanger, NorwayHQ recorded Sep 19, 2026	11-50	23 contacts →
	Exact match “Stinger Technology AS is an innovative solution provider focusing on underwater wells monitoring, seabed surveys and jacket inspections.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	A S Delprodukt	Exact match	Melhus, NorwayHQ recorded Sep 19, 2026	51-200	23 contacts →
	Exact match “Delprodukt is a leading supplier of mechanical services within land based industry, shipping and maritime, energy production, offshore and sub-sea, plate and welding services…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	Sjøentreprenøren AS	Exact match	Bergen, NorwayHQ recorded Sep 19, 2026	11-50	22 contacts →
	Exact match “Vi utfører oppdrag innen mudring, sprenging, riving, konstruksjon, inspeksjon og mye mer under vann.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23	Submara Prosjekt AS	Exact match	Tofte, NorwayHQ recorded Sep 19, 2026	11-50	21 contacts →
	Exact match “Dykkerteknikk AS ble etablert i 1976 og er et godt etablert selskap innen undervannsarbeid og marine operasjoner.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24	Kvenna	Exact match	Ålesund, NorwayHQ recorded Sep 19, 2026	11-50	21 contacts →
	Exact match “Kvenna is located in the beautiful city of Aalesund, Norway.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
25	Deep C	Exact match	Kristiansund, NorwayHQ recorded Sep 19, 2026	11-50	21 contacts →
	Exact match “Deep C provides Seabed Intervention Services that simply fit together.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “underwater construction firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 101 underwater construction firms based in Norway

See the full list, filter by size, metro and specialty, and access 976 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Underwater construction firms based in Norway at a glance

As of Sep 19, 2026

26.8%Verified-email coverage

36.1Average contacts per company

11-50Median size (employees)

8.9%Largest-city concentration · Haugesund

Sep 19, 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 101 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Norway whose business descriptions match “underwater construction firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 976 professional contacts with verified work emails across the full matched dataset. 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 19, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “underwater construction firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many underwater construction firms are there based in Norway?

RevenueBase identified 101 company matches for underwater construction firms associated with Norway as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Island Offshore tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most underwater construction firms?

Haugesund leads with 9 company records, followed by Oslo (8) and Stavanger (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 976 professional contacts with verified work emails tracked across these 101 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

Ready to reach these companies? Verified emails and direct dials for all 101 underwater construction firms based in Norway. Start with a free account, no credit card.

Download this list →

Related lists

Underwater construction firms by geography

Browse the directory

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 SmartSearch, 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.