Company lists · Data refreshed September 2026

Top 25 Offshore rig construction companies based in Norway

Name: Offshore rig construction companies based in Norway
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 66 companies tracked

RevenueBase identified 66 offshore rig construction companies headquartered in Norway as of September 2026 and tracks 6,998 professional contacts across them, including 2,665 with verified work emails. Stavanger is the largest hub.

This list covers offshore rig construction 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 17, 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 17, 2026 86% judged on-target in blind review

66Companies

6,998Contacts tracked

2,665Verified emails

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The 25 largest offshore rig construction companies based in Norway

Ranked by team size

Top 25 of 66 offshore rig construction companies based in Norway, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to offshore rig construction 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	DOF	Partial evidence	Bergen, NorwayHQ checked Sep 17, 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 17, 2026
2	Cosl Drilling Europe AS	Indirect evidence	Sandnes, NorwayHQ checked Sep 17, 2026	501-1,000	629 contacts →
	Indirect evidence “Always do better" is our guiding principle leading us through the energy transition and towards our vision of becoming the preferred supplier of drilling services.” Source: RevenueBase Database · checked Sep 17, 2026
3	Mhwirth	Indirect evidence	Kristiansand, NorwayHQ checked Sep 17, 2026	1,001-5,000	560 contacts →
	Indirect evidence “October 2021.” Source: RevenueBase Database · checked Sep 17, 2026
4	Island Offshore	Partial evidence	Ulsteinvik, NorwayHQ checked Sep 17, 2026	501-1,000	501 contacts →
	Partial 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 17, 2026
5	Eidesvik Offshore ASA	Partial evidence	Langevag, NorwayHQ checked Sep 17, 2026	501-1,000	308 contacts →
	Partial evidence “Offshore Shipping Company.” Source: RevenueBase Database · checked Sep 17, 2026
6	Ocean Installer	Strong evidence	Stavanger, NorwayHQ checked Sep 17, 2026	201-500	299 contacts →
	Strong 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 17, 2026
7	Akofs Offshore	Strong evidence	Oslo, NorwayHQ checked Sep 17, 2026	201-500	233 contacts →
	Strong 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 17, 2026
8	PSW Technology	Indirect evidence	Mongstad, NorwayHQ checked Sep 17, 2026	201-500	133 contacts →
	Indirect evidence “PSW Technology offers a wide range of services and solutions to the global drilling industry.” Source: RevenueBase Database · checked Sep 17, 2026
9	Island Drilling Company AS	Partial evidence	Sandsli, NorwayHQ checked Sep 17, 2026	51-200	114 contacts →
	Partial 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 17, 2026
10	Sevan Deepwater Technology	Indirect evidence	Bergen, NorwayHQ checked Sep 17, 2026	11-50	108 contacts →
	Indirect evidence “Sevan Deepwater Technology is a specialized marine engineering and design house.” Source: RevenueBase Database · checked Sep 17, 2026
11	NYMO	Partial evidence	Grimstad, NorwayHQ checked Sep 17, 2026	201-500	105 contacts →
	Partial evidence “Nymo is a full-service engineering, procurement and construction company within the oil & gas and process industry.” Source: RevenueBase Database · checked Sep 17, 2026
12	Westcon Yards AS	Strong evidence	Vindafjord, NorwayHQ checked Sep 17, 2026	201-500	103 contacts →
	Strong evidence “Westcon Yards AS is a modern shipyard with a main focus on offshore service, shipbuilding, rig and ship repair.” Source: RevenueBase Database · checked Sep 17, 2026
13	Macro Offshore	Strong evidence	Sandnes, NorwayHQ checked Sep 17, 2026	51-200	91 contacts →
	Strong evidence “Macro Offshore, is a fully integrated owner and operator of accommodation vessels with a fleet of two harsh-environment deep-water accommodation jack-up rigs, Haven and Crossway…” Source: RevenueBase Database · checked Sep 17, 2026
14	Moss Maritime	Partial evidence	Lysaker, NorwayHQ checked Sep 17, 2026	51-200	65 contacts →
	Partial 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 17, 2026
15	Moen Marin AS	Indirect evidence	Trondheim, NorwayHQ checked Sep 17, 2026	51-200	53 contacts →
	Indirect evidence “Moen Marin AS is a company well-anchored in the maritime community, with roots dating as far back as 1923.” Source: RevenueBase Database · checked Sep 17, 2026
16	Semar AS	Partial evidence	Lysaker, NorwayHQ checked Sep 17, 2026	11-50	52 contacts →
	Partial evidence “Semar was founded in 1980 as an independent engineering consultant firm devoted primarily to the offshore oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
17	SUB SEA Services AS	Partial evidence	Stavanger, NorwayHQ checked Sep 17, 2026	51-200	52 contacts →
	Partial evidence “Sub Sea Services is a solution-focused, flexible and collaboration oriented partner to the offshore drilling industry.” Source: RevenueBase Database · checked Sep 17, 2026
18	Petrolink AS	Partial evidence	NorwayHQ checked Sep 17, 2026	51-200	50 contacts →
	Partial 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 17, 2026
19	Subseadesign AS	Indirect evidence	Lierbyen, NorwayHQ checked Sep 17, 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 17, 2026
20	Brevik Engineering AS	Indirect evidence	Brevik, NorwayHQ checked Sep 17, 2026	11-50	36 contacts →
	Indirect evidence “Brevik Engineering is a naval architect and marine engineering company located in Brevik, Norway.” Source: RevenueBase Database · checked Sep 17, 2026
21	Inocean	Indirect evidence	Sentrum, NorwayHQ checked Sep 17, 2026	51-200	29 contacts →
	Indirect evidence “Inocean delivers design, engineering- and project management services, and cover Oil & Gas as well as the Renewable Industry.” Source: RevenueBase Database · checked Sep 17, 2026
22	Wellpartner AS	Indirect evidence	Tananger, NorwayHQ checked Sep 17, 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 17, 2026
23	Moreld	Partial evidence	Stavanger, NorwayHQ checked Sep 17, 2026	1,001-5,000	17 contacts →
	Partial evidence “Moreld is an industrial multi-disciplinary engineering group offering full-scope services across the offshore energy and marine industries including subsea installations.” Source: RevenueBase Database · checked Sep 17, 2026
24	Assure AS	Partial evidence	Kristiansand, NorwayHQ checked Sep 17, 2026	11-50	14 contacts →
	Partial evidence “Our knowledge is built on expertise and experience from rig equipment suppliers in Southern Norway, in addition to experience from rig companies, EPCIC segment and shipyards…” Source: RevenueBase Database · checked Sep 17, 2026
25	Engineering IDS	Partial evidence	Hinna, NorwayHQ checked Sep 17, 2026	11-50	10 contacts →
	Partial evidence “Engineering IDS is an engineering company specializing in offshore technology, concept design, marine services and crane inspections.” Source: RevenueBase Database · checked Sep 17, 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: offshore rig construction 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 offshore rig construction companies.
Partial evidence: Its own public description names part of offshore rig construction companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore rig construction 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 66 offshore rig construction companies based in Norway

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Offshore rig construction companies based in Norway at a glance

As of Sep 17, 2026

38.1%Verified-email coverage

106.0Average contacts per company

11-50Median size (employees)

18.2%Largest-city concentration · Stavanger

Sep 17, 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 66 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 offshore rig construction 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 “offshore rig construction 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 offshore rig construction 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 offshore rig construction 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, 2,665 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 17, 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 offshore rig construction 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 offshore rig construction companies are there based in Norway?

RevenueBase identified 66 offshore rig construction 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?

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

Which city has the most offshore rig construction companies?

Stavanger leads with 12 headquartered companies, followed by Oslo (6) and Kristiansand (5).

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 2,665 verified decision-maker contacts tracked across these 66 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 17, 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.