Company lists · Data refreshed September 2026

Top 25 Offshore drilling contractors based in Norway

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 90 companies tracked

RevenueBase identified 90 offshore drilling contractors headquartered in Norway as of September 2026 and tracks 12,568 professional contacts across them, including 3,908 with verified work emails. Stavanger is the largest hub.

This list covers offshore drilling 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 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

90Companies

12,568Contacts tracked

3,908Verified emails

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The 25 largest offshore drilling contractors based in Norway

Ranked by team size

Top 25 of 90 offshore drilling contractors 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 drilling 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 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	Archer	Partial evidence	Sandnes, NorwayHQ checked Sep 17, 2026	5,001-10,000	2,373 contacts →
	Partial evidence “Archer is a company providing drilling and well services to the global energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
3	AGR	Partial evidence	Oslo, NorwayHQ checked Sep 17, 2026	501-1,000	768 contacts →
	Partial evidence “AGR – an Aqualis company – is a multidisciplinary consultancy, specialising in drilling & wells, subsurface, marine and subsea solutions, resourcing, technical safety and software…” Source: RevenueBase Database · checked Sep 17, 2026
4	Cosl Drilling Europe AS	Partial evidence	Sandnes, NorwayHQ checked Sep 17, 2026	501-1,000	629 contacts →
	Partial 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
5	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
6	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
7	Reach Subsea	Strong evidence	Haugesund, NorwayHQ checked Sep 17, 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 17, 2026
8	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
9	Akofs Offshore	Partial evidence	Oslo, NorwayHQ checked Sep 17, 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 17, 2026
10	TS Group	Indirect evidence	Porsgrunn, NorwayHQ checked Sep 17, 2026	201-500	215 contacts →
	Indirect evidence “TS Group is a multidiscipline industry- and oil service company with offices in Porsgrunn, Molde, Herøya Industripark and Bergen.” Source: RevenueBase Database · checked Sep 17, 2026
11	Enhanced Drilling	Partial evidence	Straume, NorwayHQ checked Sep 17, 2026	51-200	194 contacts →
	Partial evidence “Innovative, enabling technology is at the very heart of Enhanced Drilling.” Source: RevenueBase Database · checked Sep 17, 2026
12	RTC Offshore AS	Partial evidence	Skien, NorwayHQ checked Sep 17, 2026	201-500	164 contacts →
	Partial evidence “RTC Offshore leverer høyt kvalifisert personell til olje- og gassindustrien, både for kortsiktige og langsiktige oppdrag.” Source: RevenueBase Database · checked Sep 17, 2026
13	PSW Technology	Partial evidence	Mongstad, NorwayHQ checked Sep 17, 2026	201-500	133 contacts →
	Partial evidence “PSW Technology offers a wide range of services and solutions to the global drilling industry.” Source: RevenueBase Database · checked Sep 17, 2026
14	Island Drilling Company AS	Strong evidence	Sandsli, NorwayHQ checked Sep 17, 2026	51-200	114 contacts →
	Strong 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
15	Techouse AS	Partial evidence	Sandnes, NorwayHQ checked Sep 17, 2026	51-200	106 contacts →
	Partial evidence “Techouse is a leader in the provision of offshore platform processing equipment and services to the international oil & gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
16	Macro Offshore	Partial evidence	Sandnes, NorwayHQ checked Sep 17, 2026	51-200	91 contacts →
	Partial 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
17	FØN Energy Services	Partial evidence	Fornebu, NorwayHQ checked Sep 17, 2026	51-200	78 contacts →
	Partial evidence “Føn Energy Services is an independent service provider to the offshore energy sector.” Source: RevenueBase Database · checked Sep 17, 2026
18	IKM Acona	Indirect evidence	Sandnes, NorwayHQ checked Sep 17, 2026	51-200	73 contacts →
	Indirect evidence “IKM Acona is a leading provider of services to the oil and gas industry covering the complete lifecycle of oil and gas projects.” Source: RevenueBase Database · checked Sep 17, 2026
19	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
20	Siem Offshore	Partial evidence	NorwayHQ checked Sep 17, 2026	1,001-5,000	64 contacts →
	Partial evidence “Siem Offshore offers a dedicated and skilled workforce.” Source: RevenueBase Database · checked Sep 17, 2026
21	SUB SEA Services AS	Strong evidence	Stavanger, NorwayHQ checked Sep 17, 2026	51-200	52 contacts →
	Strong 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
22	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
23	Subseapartner AS	Partial evidence	Haugesund, NorwayHQ checked Sep 17, 2026	11-50	44 contacts →
	Partial evidence “SubseaPartner is a leading diving contractor in the shallow-deep segment.” Source: RevenueBase Database · checked Sep 17, 2026
24	IOT Group	Indirect evidence	Stavanger, NorwayHQ checked Sep 17, 2026	201-500	43 contacts →
	Indirect evidence “IOT Group is an international service organisation within the oil & gas industry, with worldwide locations in the most important oil & gas logistics hubs.” Source: RevenueBase Database · checked Sep 17, 2026
25	Tomax AS	Partial evidence	Stavanger, NorwayHQ checked Sep 17, 2026	11-50	36 contacts →
	Partial evidence “Formed in 2005, Tomax is focused on developing technology for improving drilling efficiency with modern drilling systems.” 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 drilling 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 offshore drilling contractors.
Partial evidence: Its own public description names part of offshore drilling contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore drilling 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 90 offshore drilling contractors based in Norway

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Offshore drilling contractors based in Norway at a glance

As of Sep 17, 2026

31.1%Verified-email coverage

139.6Average contacts per company

11-50Median size (employees)

16.7%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 90 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 drilling 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 “offshore drilling 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 offshore drilling 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 offshore drilling 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, 3,908 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 drilling 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 offshore drilling contractors are there based in Norway?

RevenueBase identified 90 offshore drilling 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 offshore drilling contractors?

Stavanger leads with 15 headquartered companies, followed by Haugesund (6) and Kristiansand (6).

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 3,908 verified decision-maker contacts tracked across these 90 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.