Company lists · Data refreshed September 2026

Top 25 Offshore decommissioning contractors worldwide

Name: Offshore decommissioning contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 810 companies tracked

RevenueBase identified 810 offshore decommissioning contractors worldwide as of September 2026 and tracks 83,131 professional contacts across them, including 17,292 with verified work emails and 0 with mobile numbers. The United States is the largest market and Houston the largest hub.

This list covers offshore decommissioning contractors worldwide, 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. Country and city lists for offshore decommissioning contractors follow the table.

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

810Companies

83,131Contacts tracked

17,292Verified emails

0Mobile numbers

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The 25 largest offshore decommissioning contractors worldwide

Ranked by team size

Top 25 of 810 offshore decommissioning contractors worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to offshore decommissioning 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	SBM Offshore	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 17, 2026	5,001-10,000	8,478 contacts →
	Partial evidence “SBM Offshore is the world’s deepwater ocean-infrastructure expert.” Source: RevenueBase Database · checked Sep 17, 2026
2	Lamprell	Partial evidence	Sharjah, United Arab EmiratesHQ checked Sep 17, 2026	5,001-10,000	6,080 contacts →
	Partial evidence “With 50 years of experience, Lamprell is a key player in the global offshore wind and oil & gas markets, delivering high-quality, complex energy infrastructure projects.” Source: RevenueBase Database · checked Sep 17, 2026
3	Noble Corporation	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	5,601 contacts →
	Strong evidence “Noble is a leading offshore drilling contractor for the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
4	Valaris Limited	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	3,173 contacts →
	Indirect evidence “We Are Valaris With decades of expertise and strategic commitment built on efficiency, capability and ingenuity, our sights are continually set toward a future built with purpose…” Source: RevenueBase Database · checked Sep 17, 2026
5	Heerema Marine Contractors	Strong evidence	Leiden, NetherlandsHQ checked Sep 17, 2026	1,001-5,000	2,643 contacts →
	Strong evidence “Heerema Marine Contractors is a world-leading marine contractor in the international offshore energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
6	OCYAN	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 17, 2026	1,001-5,000	2,427 contacts →
	Indirect evidence “A OCYAN atua há décadas na prestação de serviços para o setor de óleo e gás upstream, estruturando suas operações em três frentes de atuação.” Source: RevenueBase Database · checked Sep 17, 2026
7	ZMI Holdings	Partial evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 17, 2026	1,001-5,000	1,917 contacts →
	Partial evidence “ZMI Holdings an ADNOC L&S company THE NEW WAVE Transforming the Offshore Energy Industry An integrated service provider offering unparalleled commitment.” Source: RevenueBase Database · checked Sep 17, 2026
8	ELFE	Indirect evidence	Macaé, BrazilHQ checked Sep 17, 2026	1,001-5,000	1,898 contacts →
	Indirect evidence “No mercado há mais de duas décadas, a Axia é uma empresa nacional com atuação em operação e manutenção industrial.” Source: RevenueBase Database · checked Sep 17, 2026
9	Helix Energy Solutions Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,706 contacts →
	Partial evidence “Helix Energy Solutions, headquartered in Houston, Texas, is an international offshore energy services company that provides specialty services to the offshore energy industry…” Source: RevenueBase Database · checked Sep 17, 2026
10	Bumi Armada	Indirect evidence	Kuala Lumpur, MalaysiaHQ checked Sep 17, 2026	1,001-5,000	1,628 contacts →
	Indirect evidence “At Bumi Armada, we amplify competency to resonate with the changing Oil & Gas industry demands, values and expectations.” Source: RevenueBase Database · checked Sep 17, 2026
11	Deepocean	Indirect evidence	Oslo, NorwayHQ checked Sep 17, 2026	1,001-5,000	1,375 contacts →
	Indirect evidence “DeepOcean is a technology-driven, independent solution provider in the ocean space.” Source: RevenueBase Database · checked Sep 17, 2026
12	PMI	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 17, 2026	n/a	1,308 contacts →
	Indirect evidence “Training and Development Solutions” Source: RevenueBase Database · checked Sep 17, 2026
13	CCC Underwater Engineering S.A.L	Indirect evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 17, 2026	201-500	1,279 contacts →
	Indirect evidence “(Underwater Engineering) S.A.L was established in 1976.” Source: RevenueBase Database · checked Sep 17, 2026
14	HMH	Indirect evidence	Amsterdam, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,097 contacts →
	Indirect evidence “HMH is a premier drilling solutions provider - delivering a broad portfolio of products and services that are designed to be the safest and most efficient in the industry.” Source: RevenueBase Database · checked Sep 17, 2026
15	Boskalis Offshore Energy	Indirect evidence	Perth, AustraliaHQ checked Sep 17, 2026	201-500	1,029 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
16	Altera Infrastructure	Partial evidence	Aberdeenshire, United KingdomHQ checked Sep 17, 2026	501-1,000	955 contacts →
	Partial evidence “Altera Infrastructure is a leading global energy infrastructure services group focused on the ownership and operation of offshore energy assets.” Source: RevenueBase Database · checked Sep 17, 2026
17	C-Innovation, LLC	Indirect evidence	Mandeville, LA, JamaicaHQ checked Sep 17, 2026	201-500	823 contacts →
	Indirect evidence “YOUR SINGLE SOURCE FOR SUBSEA SOLUTIONS FROM EQUIPMENT TO EXPERIENCE, C-INNOVATION IS THE SUBSEA SOLUTION C-Innovation (C-I) is an integrated marine services company specializing…” Source: RevenueBase Database · checked Sep 17, 2026
18	ABL	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	804 contacts →
	Indirect evidence “The Energy and Marine Consultants - an Aqualis company.” Source: RevenueBase Database · checked Sep 17, 2026
19	Allianz Middle East Ship Management LLC	Strong evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 17, 2026	1,001-5,000	793 contacts →
	Strong evidence “With offices in Abu Dhabi, Dubai, Qatar and Singapore, Allianz Middle East Ship Management LLC(Allianz-ME) is a well-established marine contractors providing modern Offshore…” Source: RevenueBase Database · checked Sep 17, 2026
20	Dolphin Drilling	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	201-500	694 contacts →
	Partial evidence “Dolphin Drilling is the offshore drilling pioneer of the past and for the future.” Source: RevenueBase Database · checked Sep 17, 2026
21	Unique Group	Indirect evidence	Sharjah, United Arab EmiratesHQ checked Sep 17, 2026	501-1,000	618 contacts →
	Indirect evidence “Unique Group is a leading specialist and integrated engineering solutions provider across the global subsea, renewables, oil and gas, and defence industries.” Source: RevenueBase Database · checked Sep 17, 2026
22	GIS	Indirect evidence	Galliano, LA, United StatesHQ checked Sep 17, 2026	1,001-5,000	612 contacts →
	Indirect evidence “Established in 1948 in Grand Isle, LA, GIS began as a modest company serving the commercial fishing industry.” Source: RevenueBase Database · checked Sep 17, 2026
23	Dixstone	Indirect evidence	Hoofddorp, NetherlandsHQ checked Sep 17, 2026	1,001-5,000	546 contacts →
	Indirect evidence “Headquartered in Hoofddorp, the Netherlands, Dixstone is an affiliate of the Perenco Group, specialized in integrated solutions for the industry.” Source: RevenueBase Database · checked Sep 17, 2026
24	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
25	Global Maritime	Partial evidence	Stavanger, NorwayHQ checked Sep 17, 2026	201-500	472 contacts →
	Partial evidence “Global Maritime delivers integrated marine solutions for a changing offshore world.” 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 decommissioning 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 decommissioning contractors.
Partial evidence: Its own public description names part of offshore decommissioning contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore decommissioning 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 810 offshore decommissioning contractors worldwide

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Offshore decommissioning contractors worldwide at a glance

As of Sep 17, 2026

20.8%Verified-email coverage

102.6Average contacts per company

11-50Median size (employees)

7.3%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

212

11-50

263

51-200

193

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 decommissioning 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.
Coverage: 11 countries, largest first: the United States, the United Kingdom, Nigeria, Norway, the Netherlands, the United Arab Emirates, Brazil, Malaysia, Australia, Canada and 1 more. Country and city lists for offshore decommissioning contractors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “offshore decommissioning 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 decommissioning 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 decommissioning contractors, and records with no verified work email.
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, 17,292 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.

Offshore decommissioning contractors by location

11 lists · largest first

Every Offshore decommissioning contractors list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 decommissioning 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 decommissioning contractors are there worldwide?

RevenueBase identified 810 offshore decommissioning contractors worldwide 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?

SBM Offshore, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most offshore decommissioning contractors?

The United States leads with 199 companies, followed by the United Kingdom (168) and Nigeria (79). Every offshore decommissioning contractors list by country and city is linked on this page.

Which city has the most offshore decommissioning contractors?

Houston leads with 59 headquartered companies, followed by Aberdeen (38) and Port Harcourt (19).

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 17,292 verified decision-maker contacts tracked across these 810 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.