Company lists · Data refreshed November 2026

Top 25 Deepwater support services worldwide

Name: Deepwater support services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 7,359 companies tracked

RevenueBase identified 7,359 company matches for deepwater support services worldwide as of November 2026 and tracks 502,816 professional contacts across them, including 89,687 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers company matches for deepwater support 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 deepwater support 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

7,359Companies

502,816Contacts tracked

89,687Verified emails

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The 25 largest deepwater support services worldwide

Ranked by team size

Top 25 of 7,359 company matches for deepwater support 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	Halliburton	Exact match	Houston, United StatesHQ recorded Nov 6, 2026	10001+	58,281 contacts →
	Exact match “We collaborate and engineer solutions to maximize asset value for our customers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Technip Former Company	Exact match	United KingdomHQ recorded Nov 6, 2026	10001+	12,130 contacts →
	Exact match “Technip is a former company that was separated into two independent companies: TechnipFMC and Technip Energies, which now operate with no capital ties.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Transocean	Exact match	Zug, SwitzerlandHQ recorded Nov 6, 2026	1,001-5,000	11,020 contacts →
	Exact match “Transocean is a leading international provider of offshore contract drilling services for oil and gas wells.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	SBM Offshore	Exact match	Amsterdam, NetherlandsHQ recorded Nov 6, 2026	5,001-10,000	9,397 contacts →
	Exact match “SBM Offshore is the world’s deepwater ocean-infrastructure expert.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Onesubsea	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	10001+	6,954 contacts →
	Exact match “SLB OneSubsea is the world’s leading subsea technology and solutions provider, focused on accelerating innovation to improve subsea asset performance, while increasing energy…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	EXPRO	Exact match	Houston, United StatesHQ recorded Nov 6, 2026	5,001-10,000	6,924 contacts →
	Exact match “Long recognized for extraordinary performance, superb safety and long-standing partnerships, and now incorporating Frank’s International, Expro is focused on enabling our…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Nabors Industries	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	10001+	6,404 contacts →
	Exact match “Nabors Industries is a leading provider of advanced technology for the energy industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Noble Corporation	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	5,001-10,000	6,077 contacts →
	Exact match “Noble is a leading offshore drilling contractor for the oil and gas industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	MODEC	Exact match	Chuo-ku, JapanHQ recorded Nov 6, 2026	5,001-10,000	5,542 contacts →
	Exact match “MODEC has been a leading provider of solutions for the floating offshore oil and gas market for over 50 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Seadrill	Exact match	Houston, United StatesHQ recorded Nov 6, 2026	1,001-5,000	5,319 contacts →
	Exact match “Seadrill is setting the standard in deepwater oil and gas drilling.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Seatrium	Exact match	United StatesHQ recorded Nov 6, 2026	10001+	5,162 contacts →
	Exact match “A Premier Global Player with Deep Engineering Expertise in the offshore, marine and energy industries Engineering our Future Together.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	v.group	Exact match	London, GermanyHQ recorded Nov 6, 2026	10001+	4,823 contacts →
	Exact match “The committed partner of progress for everything at sea.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Deme Group	Exact match	Beveren-kruibeke-zwijndrecht, BelgiumHQ recorded Nov 6, 2026	5,001-10,000	4,731 contacts →
	Exact match “DEME (Euronext Brussels: DEME) is a leading contractor in the fields of offshore energy, dredging and marine infrastructure, and environmental remediation.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Cotemar	Exact match	Ciudad Del Carmen, MexicoHQ recorded Nov 6, 2026	5,001-10,000	4,509 contacts →
	Exact match “We are Mexican company specialized in services for the oil industry since 1979.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Tidewater	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	5,001-10,000	3,739 contacts →
	Exact match “Tidewater Inc.(Tidewater) is the owner and operator of the world’s largest Offshore Support Vessel (OSV) fleet.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Ortec Group	Exact match	Aix-en-provence, FranceHQ recorded Nov 6, 2026	10001+	3,602 contacts →
	Exact match “En conjuguant depuis sa création audace et rigueur, le groupe Ortec est devenu aujourd’hui un des leaders des services à l’industrie, l’énergie et l’environnement.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Valaris Limited	Exact match	Houston, United StatesHQ recorded Nov 6, 2026	5,001-10,000	3,352 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	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
19	Gran Services S.A	Exact match	Macaé, BrazilHQ recorded Nov 6, 2026	1,001-5,000	3,117 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	KEY Energy Services	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,991 contacts →
	Exact match “Headquartered in Houston, Texas, Key Energy Services provides a wide array of leading edge energy production solutions and services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	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
22	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
23	Oilserv	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 6, 2026	1,001-5,000	2,408 contacts →
	Exact match “OiLSERV is a provider of an expanding range of oilfield services, including well logging, well testing, production enhancement, drilling services, surface production management…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	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
25	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

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 “deepwater support 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 7,359 deepwater support services worldwide

See the full list, filter by size, metro and specialty, and access 89,687 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Deepwater support services worldwide at a glance

As of Nov 6, 2026

17.8%Verified-email coverage

68.3Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · Houston

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

2,224

11-50

2,606

51-200

1,418

201-500

547

501-1,000

236

1,001-5,000

201

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 deepwater support services are linked below.
What qualifies: Company records worldwide whose business descriptions match “deepwater support 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 89,687 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.

Deepwater support services by location

54 lists · largest first

Every Deepwater support 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 “deepwater support services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many deepwater support services are there worldwide?

RevenueBase identified 7,359 company matches for deepwater support 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?

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

Which country has the most deepwater support services?

The United States leads with 885 companies, followed by the United Kingdom (622) and Nigeria (612). Every deepwater support services list by country and city is linked on this page.

Which city has the most deepwater support services?

Houston leads with 248 company records, followed by Singapore (174) and Port Harcourt (163).

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 89,687 professional contacts with verified work emails tracked across these 7,359 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.