Company lists · Data refreshed September 2026

Top 25 Subsea services companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 5,739 companies tracked

RevenueBase identified 5,739 subsea services companies worldwide as of September 2026 and tracks 295,157 professional contacts across them, including 48,851 with verified work emails. The United Kingdom is the largest market and Singapore the largest hub.

This list covers subsea services companies 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 22, 2026. Country and city lists for subsea services companies 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 22, 2026 86% judged on-target in blind review

5,739Companies

295,157Contacts tracked

48,851Verified emails

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The 25 largest subsea services companies worldwide

Ranked by team size

Top 25 of 5,739 subsea services companies worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to subsea services 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	Oceaneering	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	10001+	12,031 contacts →
	Indirect evidence “Oceaneering is a global technology company delivering engineered services and products and robotic solutions to the offshore energy, defense, aerospace, and manufacturing…” Source: RevenueBase Database · checked Sep 22, 2026
2	Technip Former Company	Indirect evidence	United KingdomHQ checked Sep 22, 2026	10001+	11,255 contacts →
	Indirect evidence “Technip is a former company that was separated into two independent companies: TechnipFMC and Technip Energies, which now operate with no capital ties.” Source: RevenueBase Database · checked Sep 22, 2026
3	Onesubsea	Strong evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	10001+	6,543 contacts →
	Strong evidence “SLB OneSubsea is the world’s leading subsea technology and solutions provider, focused on accelerating innovation to improve subsea asset performance, while increasing energy…” Source: RevenueBase Database · checked Sep 22, 2026
4	EXPRO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	5,001-10,000	6,466 contacts →
	Indirect evidence “Long recognized for extraordinary performance, superb safety and long-standing partnerships, and now incorporating Frank’s International, Expro is focused on enabling our…” Source: RevenueBase Database · checked Sep 22, 2026
5	Seadrill	Indirect evidence	Houston, United StatesHQ checked Sep 22, 2026	1,001-5,000	4,845 contacts →
	Indirect evidence “Seadrill is setting the standard in deepwater oil and gas drilling.” Source: RevenueBase Database · checked Sep 22, 2026
6	Seatrium	Indirect evidence	United StatesHQ checked Sep 22, 2026	10001+	4,522 contacts →
	Indirect evidence “A Premier Global Player with Deep Engineering Expertise in the offshore, marine and energy industries Engineering our Future Together.” Source: RevenueBase Database · checked Sep 22, 2026
7	Deme Group	Indirect evidence	Beveren-kruibeke-zwijndrecht, BelgiumHQ checked Sep 22, 2026	5,001-10,000	4,395 contacts →
	Indirect evidence “DEME (Euronext Brussels: DEME) is a leading contractor in the fields of offshore energy, dredging and marine infrastructure, and environmental remediation.” Source: RevenueBase Database · checked Sep 22, 2026
8	PT Elnusa TBK	Indirect evidence	Jakarta Selatan, IndonesiaHQ checked Sep 22, 2026	1,001-5,000	3,932 contacts →
	Indirect evidence “We are the one and only national company that possesses combined competencies in oil & gas services: seismic, drilling and oilfield.” Source: RevenueBase Database · checked Sep 22, 2026
9	Tidewater	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	5,001-10,000	3,290 contacts →
	Indirect evidence “Tidewater Inc.(Tidewater) is the owner and operator of the world’s largest Offshore Support Vessel (OSV) fleet.” Source: RevenueBase Database · checked Sep 22, 2026
10	DOF	Strong evidence	Bergen, NorwayHQ checked Sep 22, 2026	5,001-10,000	2,942 contacts →
	Strong 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 22, 2026
11	Heerema Marine Contractors	Indirect evidence	Leiden, NetherlandsHQ checked Sep 22, 2026	1,001-5,000	2,643 contacts →
	Indirect evidence “Heerema Marine Contractors is a world-leading marine contractor in the international offshore energy industry.” Source: RevenueBase Database · checked Sep 22, 2026
12	Allseas	Indirect evidence	Châtel-saint-denis, SwitzerlandHQ checked Sep 22, 2026	1,001-5,000	2,554 contacts →
	Indirect evidence “Allseas is a world-leading contractor in the offshore energy market.” Source: RevenueBase Database · checked Sep 22, 2026
13	OCYAN	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 22, 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 22, 2026
14	Zamil Offshore Services Company	Indirect evidence	Al-khobar, Saudi ArabiaHQ checked Sep 22, 2026	1,001-5,000	2,312 contacts →
	Indirect evidence “Zamil Offshore Services Company has been offering diversified offshore and marine support services to the oil and gas industry since 1977.” Source: RevenueBase Database · checked Sep 22, 2026
15	Oilserv	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 22, 2026	1,001-5,000	2,249 contacts →
	Indirect evidence “OiLSERV is a provider of an expanding range of oilfield services, including well logging, well testing, production enhancement, drilling services, surface production management…” Source: RevenueBase Database · checked Sep 22, 2026
16	Free Lancer	Indirect evidence	BrazilHQ checked Sep 22, 2026	n/a	2,224 contacts →
	Indirect evidence “Rov company.” Source: RevenueBase Database · checked Sep 22, 2026
17	OIL States International	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	5,001-10,000	2,215 contacts →
	Indirect evidence “Oil States International, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
18	Oceanica	Indirect evidence	Macaé - Rj, BrazilHQ checked Sep 22, 2026	1,001-5,000	2,213 contacts →
	Indirect evidence “OCEÂNICA is a Brazilian company dedicated to providing services and engineering technology solutions for companies with underwater activities” Source: RevenueBase Database · checked Sep 22, 2026
19	ZMI Holdings	Indirect evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 22, 2026	1,001-5,000	1,917 contacts →
	Indirect 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 22, 2026
20	Grupo CBO	Indirect evidence	Niterói, BrazilHQ checked Sep 22, 2026	1,001-5,000	1,847 contacts →
	Indirect evidence “O Grupo CBO é uma das maiores empresas de apoio marítimo do Brasil.” Source: RevenueBase Database · checked Sep 22, 2026
21	Helix Energy Solutions Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,706 contacts →
	Indirect 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 22, 2026
22	Rawabi Vallianz Offshore Services	Indirect evidence	Al Khobar, Saudi ArabiaHQ checked Sep 22, 2026	1,001-5,000	1,664 contacts →
	Indirect evidence “With an extensive fleet of over 200 vessels worldwide, Rawabi Vallianz Offshore Services leverages Rawabi’s expertise to ensure exceptional quality and on-time delivery.” Source: RevenueBase Database · checked Sep 22, 2026
23	Bumi Armada	Indirect evidence	Kuala Lumpur, MalaysiaHQ checked Sep 22, 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 22, 2026
24	Sembcorp Marine LTD	Indirect evidence	SingaporeHQ checked Sep 22, 2026	1,001-5,000	1,610 contacts →
	Indirect evidence “Delivering Sustainable Synergies for Global Possibilities Sembcorp Marine is an integrated brand offering one-stop engineering solutions for the offshore, marine and energy…” Source: RevenueBase Database · checked Sep 22, 2026
25	Grupo Bravante	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 22, 2026	1,001-5,000	1,592 contacts →
	Indirect evidence “O Grupo Bravante é 100% brasileiro com mais de 60 anos provendo serviços para a indústria de óleo e gás, além de atuar nas áreas de apoio marítimo, apoio portuário, construção e…” Source: RevenueBase Database · checked Sep 22, 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: subsea services 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 subsea services companies.
Partial evidence: Its own public description names part of subsea services companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name subsea services 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 5,739 subsea services companies worldwide

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Subsea services companies worldwide at a glance

As of Sep 22, 2026

16.6%Verified-email coverage

51.4Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · Singapore

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

1,925

11-50

2,064

51-200

1,018

201-500

376

501-1,000

166

1,001-5,000

126

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 subsea services 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.
Coverage: Every country. Country and city lists for subsea services companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “subsea services 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 subsea services 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 subsea services companies, 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, 48,851 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 22, 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.

Subsea services companies by location

26 lists · largest first

Every Subsea services companies 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 subsea services 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 subsea services companies are there worldwide?

RevenueBase identified 5,739 subsea services companies 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?

Oceaneering, headquartered in Houston, tops this list with the largest team on record.

Which country has the most subsea services companies?

The United Kingdom leads with 658 companies, followed by the United States (604) and Nigeria (349). Every subsea services companies list by country and city is linked on this page.

Which city has the most subsea services companies?

Singapore leads with 197 headquartered companies, followed by Houston (151) and Aberdeen (125).

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 48,851 verified decision-maker contacts tracked across these 5,739 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 22, 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.