Company lists · Data refreshed October 2026

Top 25 Oil rig maintenance contractors worldwide

Name: Oil rig maintenance contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 22, 2026 5,085 companies tracked

RevenueBase identified 5,085 company matches for oil rig maintenance contractors worldwide as of October 2026 and tracks 293,490 professional contacts across them, including 40,936 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers company matches for oil rig maintenance contractors 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 October 22, 2026. Country and city lists for oil rig maintenance contractors 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 Oct 22, 2026 How this list was built

5,085Companies

293,490Contacts tracked

40,936Verified emails

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The 25 largest oil rig maintenance contractors worldwide

Ranked by team size

Top 25 of 5,085 company matches for oil rig maintenance contractors worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 22, 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	Transocean	Exact match	Zug, SwitzerlandHQ recorded Oct 22, 2026	1,001-5,000	10,599 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 · Oct 22, 2026 · View company records in RevenueBase
2	Noble Corporation	Exact match	Houston, TX, United StatesHQ recorded Oct 22, 2026	5,001-10,000	5,939 contacts →
	Exact match “Noble is a leading offshore drilling contractor for the oil and gas industry.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
3	MODEC	Exact match	Chuo-ku, JapanHQ recorded Oct 22, 2026	5,001-10,000	5,354 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 · Oct 22, 2026 · View company records in RevenueBase
4	Bonatti	Exact match	Parma, United StatesHQ recorded Oct 22, 2026	5,001-10,000	5,233 contacts →
	Exact match “Bonatti is an International Contractor providing services to energy industry with over 75 years of experience.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
5	Seadrill	Exact match	Houston, United StatesHQ recorded Oct 22, 2026	1,001-5,000	5,065 contacts →
	Exact match “Seadrill is setting the standard in deepwater oil and gas drilling.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
6	Cotemar	Exact match	Ciudad Del Carmen, MexicoHQ recorded Oct 22, 2026	5,001-10,000	4,362 contacts →
	Exact match “We are Mexican company specialized in services for the oil industry since 1979.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
7	Valaris Limited	Exact match	Houston, TX, United StatesHQ recorded Oct 22, 2026	5,001-10,000	3,263 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 · Oct 22, 2026 · View company records in RevenueBase
8	Estrutural	Exact match	Porto Alegre, BrazilHQ recorded Oct 22, 2026	1,001-5,000	2,795 contacts →
	Exact match “Quem somos: Somos uma empresa nacional, com mais de 30 anos no segmento da construção, montagem e manutenção industrial.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
9	Heerema Marine Contractors	Exact match	Leiden, NetherlandsHQ recorded Oct 22, 2026	1,001-5,000	2,792 contacts →
	Exact match “Heerema Marine Contractors is a world-leading marine contractor in the international offshore energy industry.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
10	Shelf Drilling	Exact match	Dubai, United Arab EmiratesHQ recorded Oct 22, 2026	1,001-5,000	2,770 contacts →
	Exact match “Shelf Drilling is a wholly owned subsidiary of ADES Holding Company, a leading international oil and gas drilling services provider.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
11	Allseas	Exact match	Châtel-saint-denis, United StatesHQ recorded Oct 22, 2026	1,001-5,000	2,765 contacts →
	Exact match “Allseas is a world-leading contractor in the offshore energy market.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
12	Brasfels	Exact match	Angra Dos Reis, BrazilHQ recorded Oct 22, 2026	5,001-10,000	2,478 contacts →
	Exact match “Empresa multinacional na área de construção e reparos de navios e plataformas.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
13	Zamil Offshore Services Company	Exact match	Al-khobar, Saudi ArabiaHQ recorded Oct 22, 2026	1,001-5,000	2,406 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 · Oct 22, 2026 · View company records in RevenueBase
14	OCYAN	Exact match	Rio De Janeiro, BrazilHQ recorded Oct 22, 2026	1,001-5,000	2,328 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 · Oct 22, 2026 · View company records in RevenueBase
15	SAN Antonio Internacional	Exact match	Comuna 1, ArgentinaHQ recorded Oct 22, 2026	1,001-5,000	2,247 contacts →
	Exact match “Somos la mayor prestadora de servicios de perforación de la Argentina y somos líderes en la prestación de servicios asociados al mantenimiento y optimización de los pozos de…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
16	Constellation OIL Services	Exact match	Rio De Janeiro, BrazilHQ recorded Oct 22, 2026	1,001-5,000	2,176 contacts →
	Exact match “Constellation Oil Services is a drilling contractor highly differentiated due to its unique experience in deep and ultra-deepwater drilling.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
17	Egyptian Drilling Company EDC	Exact match	Cairo, EgyptHQ recorded Oct 22, 2026	5,001-10,000	2,102 contacts →
	Exact match “EDC is one of the leading drilling contractors in Egypt and the MENA region; established in 1976 in partnership with Maersk Drilling, EDC is now 100% owned by Egyptian General…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
18	Arabian Drilling	Exact match	Al-khobar, Saudi ArabiaHQ recorded Oct 22, 2026	5,001-10,000	2,072 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
19	ELFE	Exact match	Macaé, BrazilHQ recorded Oct 22, 2026	1,001-5,000	2,006 contacts →
	Exact match “No mercado há mais de duas décadas, a Axia é uma empresa nacional com atuação em operação e manutenção industrial.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
20	Grupo CBO	Exact match	Niterói, BrazilHQ recorded Oct 22, 2026	1,001-5,000	1,972 contacts →
	Exact match “O Grupo CBO é uma das maiores empresas de apoio marítimo do Brasil.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
21	Brown & Root Industrial Services, LLC	Exact match	Baton Rouge, LA, United StatesHQ recorded Oct 22, 2026	5,001-10,000	1,969 contacts →
	Exact match “Brown & Root Industrial Services offers the full range of industrial services – engineering, construction, maintenance, turnaround, and specialty (painting, scaffolding…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
22	EMC Egyptian Maintenance Company	Exact match	New Cairo, EgyptHQ recorded Oct 22, 2026	5,001-10,000	1,949 contacts →
	Exact match “Since its foundation in 1997, EMC has become a well-known maintenance and modification service provider to major oil, gas and petrochemical companies, pipeline and refinery…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
23	Dietsmann	Exact match	Fontvieille, MonacoHQ recorded Oct 22, 2026	5,001-10,000	1,931 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 · Oct 22, 2026 · View company records in RevenueBase
24	Groupe Ponticelli Frères	Exact match	FranceHQ recorded Oct 22, 2026	5,001-10,000	1,900 contacts →
	Exact match “The Ponticelli Frères Group is one of the main European service suppliers to companies in the energy (oil and gas, nuclear, renewable energy), industrial (chemical, steelworks…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
25	Borr Drilling	Exact match	London, United KingdomHQ recorded Oct 22, 2026	1,001-5,000	1,805 contacts →
	Exact match “Borr Drilling Limited is an offshore shallow-water drilling contractor providing worldwide offshore drilling services to the oil and gas industry.” Recorded in the RevenueBase company graph · Oct 22, 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 “oil rig maintenance contractors”. 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 5,085 oil rig maintenance contractors worldwide

See the full list, filter by size, metro and specialty, and access 40,936 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Oil rig maintenance contractors worldwide at a glance

As of Oct 22, 2026

13.9%Verified-email coverage

57.7Average contacts per company

11-50Median size (employees)

2.3%Largest-city concentration · Houston

Oct 22, 2026Page data refreshed

Companies by employee count

1-10

1,167

11-50

1,802

51-200

1,152

201-500

494

501-1,000

201

1,001-5,000

198

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 oil rig maintenance contractors are linked below.
What qualifies: Company records worldwide whose business descriptions match “oil rig maintenance contractors” 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 40,936 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 October 22, 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.

Oil rig maintenance contractors by location

39 lists · largest first

Every Oil rig maintenance contractors 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 “oil rig maintenance contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many oil rig maintenance contractors are there worldwide?

RevenueBase identified 5,085 company matches for oil rig maintenance contractors worldwide as of October 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?

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

Which country has the most oil rig maintenance contractors?

The United States leads with 814 companies, followed by Brazil (313) and Nigeria (292). Every oil rig maintenance contractors list by country and city is linked on this page.

Which city has the most oil rig maintenance contractors?

Houston leads with 116 company records, followed by Singapore (114) and Port Harcourt (101).

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 40,936 professional contacts with verified work emails tracked across these 5,085 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 October 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 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.