Company lists · Data refreshed September 2026

Top 25 Offshore support vessel operators worldwide

Name: Offshore support vessel operators worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 4,904 companies tracked

RevenueBase identified 4,904 offshore support vessel operators worldwide as of September 2026 and tracks 323,601 professional contacts across them, including 49,438 with verified work emails. The United States is the largest market and Singapore the largest hub.

This list covers offshore support vessel operators 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 20, 2026. Country and city lists for offshore support vessel operators 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 20, 2026 86% judged on-target in blind review

4,904Companies

323,601Contacts tracked

49,438Verified emails

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The 25 largest offshore support vessel operators worldwide

Ranked by team size

Top 25 of 4,904 offshore support vessel operators worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to offshore support vessel operators: 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	Transocean	Partial evidence	Zug, SwitzerlandHQ checked Sep 20, 2026	1,001-5,000	10,068 contacts →
	Partial evidence “Transocean is a leading international provider of offshore contract drilling services for oil and gas wells.” Source: RevenueBase Database · checked Sep 20, 2026
2	Bernhard Schulte Shipmanagement	Partial evidence	Hamburg, GermanyHQ checked Sep 20, 2026	10001+	5,732 contacts →
	Partial evidence “Bernhard Schulte Shipmanagement (BSM) is an integrated maritime solutions provider and one of the world’s top-ranking ship managers in the gas, tanker, offshore, container, bulk…” Source: RevenueBase Database · checked Sep 20, 2026
3	Noble Corporation	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	5,001-10,000	5,601 contacts →
	Partial evidence “Noble is a leading offshore drilling contractor for the oil and gas industry.” Source: RevenueBase Database · checked Sep 20, 2026
4	MODEC	Partial evidence	Chuo-ku, JapanHQ checked Sep 20, 2026	5,001-10,000	5,077 contacts →
	Partial evidence “MODEC has been a leading provider of solutions for the floating offshore oil and gas market for over 50 years.” Source: RevenueBase Database · checked Sep 20, 2026
5	Seadrill	Indirect evidence	Houston, United StatesHQ checked Sep 20, 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 20, 2026
6	v.group	Indirect evidence	London, GermanyHQ checked Sep 20, 2026	10001+	4,559 contacts →
	Indirect evidence “The committed partner of progress for everything at sea.” Source: RevenueBase Database · checked Sep 20, 2026
7	Deme Group	Partial evidence	Beveren-kruibeke-zwijndrecht, BelgiumHQ checked Sep 20, 2026	5,001-10,000	4,395 contacts →
	Partial 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 20, 2026
8	GAC Group	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 20, 2026	5,001-10,000	3,322 contacts →
	Indirect evidence “With more than 7,500 employees working in 300 strategically located offices in more than 50 countries around the world, GAC delivers world-class shipping, logistics and marine…” Source: RevenueBase Database · checked Sep 20, 2026
9	Tidewater	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	5,001-10,000	3,290 contacts →
	Strong evidence “Tidewater Inc.(Tidewater) is the owner and operator of the world’s largest Offshore Support Vessel (OSV) fleet.” Source: RevenueBase Database · checked Sep 20, 2026
10	Valaris Limited	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 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 20, 2026
11	Transpetro	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 20, 2026	5,001-10,000	3,119 contacts →
	Indirect evidence “A Transpetro – Petrobras Transporte S.A.” Source: RevenueBase Database · checked Sep 20, 2026
12	DOF	Strong evidence	Bergen, NorwayHQ checked Sep 20, 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 20, 2026
13	Bram Offshore	Partial evidence	Rio De Janeiro, BrazilHQ checked Sep 20, 2026	1,001-5,000	2,922 contacts →
	Partial evidence “Somos a Bram Offshore Transportes Marítimos, a maior empresa representante do Grupo Edison Chouest Offshore no Brasil, reconhecida como o fornecedor de soluções de transporte…” Source: RevenueBase Database · checked Sep 20, 2026
14	Heerema Marine Contractors	Partial evidence	Leiden, NetherlandsHQ checked Sep 20, 2026	1,001-5,000	2,643 contacts →
	Partial evidence “Heerema Marine Contractors is a world-leading marine contractor in the international offshore energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
15	Allseas	Partial evidence	Châtel-saint-denis, SwitzerlandHQ checked Sep 20, 2026	1,001-5,000	2,554 contacts →
	Partial evidence “Allseas is a world-leading contractor in the offshore energy market.” Source: RevenueBase Database · checked Sep 20, 2026
16	Arkas Holding	Indirect evidence	Izmir, TürkiyeHQ checked Sep 20, 2026	5,001-10,000	2,537 contacts →
	Indirect evidence “1902 yılında temelleri atılan Arkas’ın ana iş kolları, Denizcilik ve Liman ve Terminal Hizmetleri ile birlikte deniz, kara, demiryolu ve hava taşımacılığını entegre ederek sunduğu…” Source: RevenueBase Database · checked Sep 20, 2026
17	OCYAN	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 20, 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 20, 2026
18	P&o Maritime Logistics	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 20, 2026	5,001-10,000	2,355 contacts →
	Partial evidence “P&O Maritime Logistics is a leading provider of marine solutions with focus on offshore energy, port services and cargo transport.” Source: RevenueBase Database · checked Sep 20, 2026
19	Teekay	Indirect evidence	Vancouver, BC, CanadaHQ checked Sep 20, 2026	1,001-5,000	2,319 contacts →
	Indirect evidence “Teekay is a leading provider of international crude oil marine transportation services.” Source: RevenueBase Database · checked Sep 20, 2026
20	Zamil Offshore Services Company	Strong evidence	Al-khobar, Saudi ArabiaHQ checked Sep 20, 2026	1,001-5,000	2,312 contacts →
	Strong 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 20, 2026
21	Free Lancer	Indirect evidence	BrazilHQ checked Sep 20, 2026	n/a	2,224 contacts →
	Indirect evidence “Rov company.” Source: RevenueBase Database · checked Sep 20, 2026
22	Arabian Drilling	Partial evidence	Al-khobar, Saudi ArabiaHQ checked Sep 20, 2026	5,001-10,000	2,042 contacts →
	Partial evidence “We are the region’s trusted onshore and offshore oil & gas drilling company with an extensive track record of operational excellence and advanced capabilities that have enabled…” Source: RevenueBase Database · checked Sep 20, 2026
23	BW Offshore	Partial evidence	Oslo, NorwayHQ checked Sep 20, 2026	501-1,000	1,860 contacts →
	Partial evidence “BW Offshore engineers innovative floating production solutions.” Source: RevenueBase Database · checked Sep 20, 2026
24	Edison Chouest Offshore	Partial evidence	Cut Off, LA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,853 contacts →
	Partial evidence “Recognized Worldwide for Diverse and Dynamic Marine Transportation Solutions Founded as Edison Chouest Boat Rental in Galliano, Louisiana, in 1960, the Edison Chouest Offshore…” Source: RevenueBase Database · checked Sep 20, 2026
25	Grupo CBO	Indirect evidence	Niterói, BrazilHQ checked Sep 20, 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 20, 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 support vessel operators. 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 support vessel operators.
Partial evidence: Its own public description names part of offshore support vessel operators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore support vessel operators. 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 4,904 offshore support vessel operators worldwide

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Offshore support vessel operators worldwide at a glance

As of Sep 20, 2026

15.3%Verified-email coverage

66.0Average contacts per company

11-50Median size (employees)

3.8%Largest-city concentration · Singapore

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

1,383

11-50

1,699

51-200

935

201-500

420

501-1,000

217

1,001-5,000

174

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 offshore support vessel operators, 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 offshore support vessel operators are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “offshore support vessel operators”. 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 support vessel operators), 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 support vessel operators, 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, 49,438 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 20, 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 support vessel operators by location

26 lists · largest first

Every Offshore support vessel operators 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 support vessel operators, 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 support vessel operators are there worldwide?

RevenueBase identified 4,904 offshore support vessel operators 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?

Transocean, headquartered in Zug, tops this list with the largest team on record.

Which country has the most offshore support vessel operators?

The United States leads with 454 companies, followed by the United Kingdom (289) and the United Arab Emirates (262). Every offshore support vessel operators list by country and city is linked on this page.

Which city has the most offshore support vessel operators?

Singapore leads with 184 headquartered companies, followed by Dubai (105) and Istanbul (82).

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 49,438 verified decision-maker contacts tracked across these 4,904 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 20, 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.