Company lists · Data refreshed September 2026

Top 25 Offshore drilling contractors worldwide

Name: Offshore drilling contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 2,425 companies tracked

RevenueBase identified 2,425 offshore drilling contractors worldwide as of September 2026 and tracks 258,497 professional contacts across them, including 40,576 with verified work emails and 0 with mobile numbers. The United States is the largest market and Houston the largest hub.

This list covers offshore drilling contractors 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 17, 2026. Country and city lists for offshore drilling contractors 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 17, 2026 86% judged on-target in blind review

2,425Companies

258,497Contacts tracked

40,576Verified emails

0Mobile numbers

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The 25 largest offshore drilling contractors worldwide

Ranked by team size

Top 25 of 2,425 offshore drilling contractors worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to offshore drilling contractors: 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	SBM Offshore	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 17, 2026	5,001-10,000	8,478 contacts →
	Partial evidence “SBM Offshore is the world’s deepwater ocean-infrastructure expert.” Source: RevenueBase Database · checked Sep 17, 2026
2	EXPRO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 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 17, 2026
3	Nabors Industries	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	5,865 contacts →
	Indirect evidence “Nabors Industries is a leading provider of advanced technology for the energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
4	Noble Corporation	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	5,601 contacts →
	Strong evidence “Noble is a leading offshore drilling contractor for the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
5	Seadrill	Partial evidence	Houston, United StatesHQ checked Sep 17, 2026	1,001-5,000	4,845 contacts →
	Partial evidence “Seadrill is setting the standard in deepwater oil and gas drilling.” Source: RevenueBase Database · checked Sep 17, 2026
6	Cotemar	Indirect evidence	Ciudad Del Carmen, MexicoHQ checked Sep 17, 2026	5,001-10,000	4,138 contacts →
	Indirect evidence “We are Mexican company specialized in services for the oil industry since 1979.” Source: RevenueBase Database · checked Sep 17, 2026
7	PT Elnusa TBK	Partial evidence	Jakarta Selatan, IndonesiaHQ checked Sep 17, 2026	1,001-5,000	3,932 contacts →
	Partial 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 17, 2026
8	NESR	Indirect evidence	Houston, United StatesHQ checked Sep 17, 2026	5,001-10,000	3,683 contacts →
	Indirect evidence “National Energy Services Reunited Corp.(NESR) was founded in 2017 as one of the largest national oilfield services providers in the MENA and Asia Pacific regions and was the first…” Source: RevenueBase Database · checked Sep 17, 2026
9	Tidewater	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	3,290 contacts →
	Partial evidence “Tidewater Inc.(Tidewater) is the owner and operator of the world’s largest Offshore Support Vessel (OSV) fleet.” Source: RevenueBase Database · checked Sep 17, 2026
10	ADES	Partial evidence	Al Khobar, Saudi ArabiaHQ checked Sep 17, 2026	5,001-10,000	3,251 contacts →
	Partial evidence “ADES is a world-leading international provider of oil and gas drilling services.” Source: RevenueBase Database · checked Sep 17, 2026
11	Valaris Limited	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 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 17, 2026
12	DOF	Partial evidence	Bergen, NorwayHQ checked Sep 17, 2026	5,001-10,000	2,942 contacts →
	Partial 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 17, 2026
13	Shelf Drilling	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 17, 2026	1,001-5,000	2,689 contacts →
	Partial evidence “Shelf Drilling is a wholly owned subsidiary of ADES Holding Company, a leading international oil and gas drilling services provider.” Source: RevenueBase Database · checked Sep 17, 2026
14	Heerema Marine Contractors	Strong evidence	Leiden, NetherlandsHQ checked Sep 17, 2026	1,001-5,000	2,643 contacts →
	Strong evidence “Heerema Marine Contractors is a world-leading marine contractor in the international offshore energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
15	Precision Drilling	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 17, 2026	5,001-10,000	2,471 contacts →
	Indirect evidence “Precision is a leading provider of safe and High Performance, High-Value services to the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
16	Estrutural	Indirect evidence	Porto Alegre, BrazilHQ checked Sep 17, 2026	1,001-5,000	2,461 contacts →
	Indirect evidence “Quem somos: Somos uma empresa nacional, com mais de 30 anos no segmento da construção, montagem e manutenção industrial.” Source: RevenueBase Database · checked Sep 17, 2026
17	OCYAN	Indirect evidence	Rio De Janeiro, BrazilHQ checked Sep 17, 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 17, 2026
18	Archer	Partial evidence	Sandnes, NorwayHQ checked Sep 17, 2026	5,001-10,000	2,373 contacts →
	Partial evidence “Archer is a company providing drilling and well services to the global energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
19	Brasfels	Indirect evidence	Angra Dos Reis, BrazilHQ checked Sep 17, 2026	5,001-10,000	2,370 contacts →
	Indirect evidence “Empresa multinacional na área de construção e reparos de navios e plataformas.” Source: RevenueBase Database · checked Sep 17, 2026
20	Patterson-Uti	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	2,317 contacts →
	Partial evidence “Patterson-UTI is a leading provider of drilling and completion services to oil and natural gas exploration and production companies in the United States and other select…” Source: RevenueBase Database · checked Sep 17, 2026
21	Zamil Offshore Services Company	Partial evidence	Al-khobar, Saudi ArabiaHQ checked Sep 17, 2026	1,001-5,000	2,312 contacts →
	Partial 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 17, 2026
22	Oilserv	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 17, 2026	1,001-5,000	2,249 contacts →
	Partial 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 17, 2026
23	OIL States International	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	2,215 contacts →
	Indirect evidence “Oil States International, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
24	Ensign Energy Services	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 17, 2026	1,001-5,000	2,176 contacts →
	Indirect evidence “Ensign Energy Services Inc.” Source: RevenueBase Database · checked Sep 17, 2026
25	Egyptian Drilling Company EDC	Strong evidence	Cairo, EgyptHQ checked Sep 17, 2026	5,001-10,000	2,122 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 17, 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 drilling contractors. 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 drilling contractors.
Partial evidence: Its own public description names part of offshore drilling contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore drilling contractors. 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 2,425 offshore drilling contractors worldwide

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Offshore drilling contractors worldwide at a glance

As of Sep 17, 2026

15.7%Verified-email coverage

106.6Average contacts per company

11-50Median size (employees)

7.0%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

528

11-50

782

51-200

580

201-500

245

501-1,000

116

1,001-5,000

130

5,001-10,000

10001+

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 drilling contractors, 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: 20 countries, largest first: the United States, Nigeria, the United Arab Emirates, the United Kingdom, Canada, India, Brazil, Indonesia, Singapore, Norway and 10 more. Country and city lists for offshore drilling contractors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “offshore drilling contractors”. 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 drilling contractors), 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 drilling contractors, 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, 40,576 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 17, 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 drilling contractors by location

20 lists · largest first

Every Offshore drilling contractors 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 drilling contractors, 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 drilling contractors are there worldwide?

RevenueBase identified 2,425 offshore drilling contractors 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?

SBM Offshore, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most offshore drilling contractors?

The United States leads with 704 companies, followed by Nigeria (223) and the United Arab Emirates (167). Every offshore drilling contractors list by country and city is linked on this page.

Which city has the most offshore drilling contractors?

Houston leads with 169 headquartered companies, followed by Singapore (93) and Port Harcourt (64).

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 40,576 verified decision-maker contacts tracked across these 2,425 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 17, 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.