Company lists · Data refreshed November 2026

Top 25 Subsea inspection and maintenance services worldwide

Name: Subsea inspection and maintenance services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 5,281 companies tracked

RevenueBase identified 5,281 company matches for subsea inspection and maintenance services worldwide as of November 2026 and tracks 135,869 professional contacts across them, including 22,045 with verified work emails. The United Kingdom is the largest market and Singapore the largest hub.

This list covers company matches for subsea inspection and maintenance services worldwide, 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 November 6, 2026. Country and city lists for subsea inspection and maintenance services follow the table.

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 Nov 6, 2026 How this list was built

5,281Companies

135,869Contacts tracked

22,045Verified emails

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The 25 largest subsea inspection and maintenance services worldwide

Ranked by team size

Top 25 of 5,281 company matches for subsea inspection and maintenance services worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	DOF	Exact match	Bergen, NorwayHQ recorded Nov 6, 2026	5,001-10,000	3,303 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Allseas	Exact match	Châtel-saint-denis, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,837 contacts →
	Exact match “Allseas is a world-leading contractor in the offshore energy market.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Zamil Offshore Services Company	Exact match	Al-khobar, Saudi ArabiaHQ recorded Nov 6, 2026	1,001-5,000	2,473 contacts →
	Exact match “Zamil Offshore Services Company has been offering diversified offshore and marine support services to the oil and gas industry since 1977.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Free Lancer	Exact match	BrazilHQ recorded Nov 6, 2026	n/a	2,408 contacts →
	Exact match “Rov company.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	OCYAN	Exact match	Rio De Janeiro, BrazilHQ recorded Nov 6, 2026	1,001-5,000	2,402 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Dietsmann	Exact match	Fontvieille, MonacoHQ recorded Nov 6, 2026	5,001-10,000	2,035 contacts →
	Exact match “Dietsmann is the leading independent specialist in Operation & Maintenance services for continuous-production plant in the oil & gas and power industries with over 40 years of…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Grupo CBO	Exact match	Niterói, BrazilHQ recorded Nov 6, 2026	1,001-5,000	1,847 contacts →
	Exact match “O Grupo CBO é uma das maiores empresas de apoio marítimo do Brasil.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Helix Energy Solutions Group	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,814 contacts →
	Exact match “Helix Energy Solutions, headquartered in Houston, Texas, is an international offshore energy services company that provides specialty services to the offshore energy industry…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Deepocean	Exact match	Oslo, NorwayHQ recorded Nov 6, 2026	1,001-5,000	1,607 contacts →
	Exact match “DeepOcean is a technology-driven, independent solution provider in the ocean space.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	CCC Underwater Engineering S.A.L	Exact match	Abu Dhabi, United Arab EmiratesHQ recorded Nov 6, 2026	201-500	1,344 contacts →
	Exact match “(Underwater Engineering) S.A.L was established in 1976.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Aries Energy	Exact match	United Arab EmiratesHQ recorded Nov 6, 2026	1,001-5,000	1,319 contacts →
	Exact match “Aries is the largest Engineering, Inspection & Maintenance firm in the Middle East.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	BELOV	Exact match	Matriz, BrazilHQ recorded Nov 6, 2026	1,001-5,000	1,251 contacts →
	Exact match “A Belov Engenharia foi criada em 1981 em Salvador/BA, pelo engenheiro Aleixo Belov, que à época desfrutava de uma experiência de 15 anos de participação na condução das maiores…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Tuboscope	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	10001+	1,103 contacts →
	Exact match “For more than 85 years, Tuboscope™ has provided the industry with tubular expertise and an integrated suite of value-added solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Micoperi SRL	Exact match	Ravenna, ItalyHQ recorded Nov 6, 2026	201-500	959 contacts →
	Exact match “MICOPERI has been active in the marine sector since 1946 when the company was incorporated as a salvage company to free the shipping routes from vessels sunk during the Second…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	NDT Global	Exact match	Québec, QC, CanadaHQ recorded Nov 6, 2026	1,001-5,000	871 contacts →
	Exact match “NDT Global is the leading provider of inline diagnostic solutions, advanced data insights, subsea inspection, and integrity management services that safeguard energy-sector…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Swire Pacific Offshore	Exact match	SingaporeHQ recorded Nov 6, 2026	1,001-5,000	853 contacts →
	Exact match “Established since 1975, Swire Pacific Offshore (SPO) was a trusted marine services provider that pride itself on delivering safe, high quality, reliable and sustainable Marine…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Allianz Middle East Ship Management LLC	Exact match	Abu Dhabi, United Arab EmiratesHQ recorded Nov 6, 2026	1,001-5,000	816 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	KBR Energo Engineering	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	n/a	807 contacts →
	Exact match “Energo Engineering is a KBR Company that provides the full package of structural integrity management (SIM) and advanced structural engineering services for offshore floating and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Stanford Marine	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 6, 2026	n/a	775 contacts →
	Exact match “Established in 1997, we operate an extensive fleet of Offshore Supply Vessels that service the Oil and Gas industry in the Middle East, South East Asia, Africa, India and the Gulf…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Yantai Cimc Raffles Offshore LTD	Exact match	Yantai, ChinaHQ recorded Nov 6, 2026	10001+	759 contacts →
	Exact match “Yantai CIMC Raffles Offshore Technology Group Co, Ltd.(“CIMC Raffles”) is a leading offshore engineering and high-end marine equipment group in China, with a strong focus on the…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Pacific Radiance LTD	Exact match	SingaporeHQ recorded Nov 6, 2026	201-500	741 contacts →
	Exact match “The Pacific Radiance Group of Companies is an established owner and operator of offshore vessels and a provider of subsea services, shipyard services, marine equipment as well as…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	C & C Technologies, INC	Exact match	Lafayette, LA, United StatesHQ recorded Nov 6, 2026	501-1,000	692 contacts →
	Exact match “Oceaneering International, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Sistac	Exact match	Macaé, BrazilHQ recorded Nov 6, 2026	501-1,000	687 contacts →
	Exact match “A SISTAC é líder no segmento de inspeção, manutenção e reparo offshore na indústria de óleo e gás no Brasil, através de acesso com embarcações de apoio marítimo, mergulhadores…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Unique Group	Exact match	Sharjah, United Arab EmiratesHQ recorded Nov 6, 2026	501-1,000	643 contacts →
	Exact match “Unique Group is a leading specialist and integrated engineering solutions provider across the global subsea, renewables, oil and gas, and defence industries.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Vertical Group	Exact match	Niterói, BrazilHQ recorded Nov 6, 2026	501-1,000	637 contacts →
	Exact match “Somos uma empresa especializada em serviços de trabalho em altura, com foco em inspeção, reparo e manutenção nos setores naval e industrial.” Recorded in the RevenueBase company graph · Nov 6, 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 “subsea inspection and maintenance services”. 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 5,281 subsea inspection and maintenance services worldwide

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Subsea inspection and maintenance services worldwide at a glance

As of Nov 6, 2026

16.2%Verified-email coverage

25.7Average contacts per company

11-50Median size (employees)

3.1%Largest-city concentration · Singapore

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

2,137

11-50

1,938

51-200

790

201-500

218

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for subsea inspection and maintenance services are linked below.
What qualifies: Company records worldwide whose business descriptions match “subsea inspection and maintenance services” 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. 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 22,045 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 November 6, 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.

Subsea inspection and maintenance services by location

40 lists · largest first

Every Subsea inspection and maintenance services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 “subsea inspection and maintenance services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many subsea inspection and maintenance services are there worldwide?

RevenueBase identified 5,281 company matches for subsea inspection and maintenance services worldwide as of November 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?

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

Which country has the most subsea inspection and maintenance services?

The United Kingdom leads with 515 companies, followed by the United States (508) and Brazil (295). Every subsea inspection and maintenance services list by country and city is linked on this page.

Which city has the most subsea inspection and maintenance services?

Singapore leads with 162 company records, followed by Aberdeen (89) and Dubai (82).

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 22,045 professional contacts with verified work emails tracked across these 5,281 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 November 6, 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 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.