Company lists · Data refreshed September 2026

Top 25 Drilling services contractors based in the United States

Name: Drilling services contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 1,356 companies tracked

RevenueBase identified 1,356 drilling services contractors headquartered in the United States as of September 2026 and tracks 141,238 professional contacts across them, including 34,277 with verified work emails. Houston is the largest hub.

This list covers drilling services contractors headquartered in the United States, 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 16, 2026.

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 16, 2026 86% judged on-target in blind review

1,356Companies

141,238Contacts tracked

34,277Verified emails

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The 25 largest drilling services contractors based in the United States

Ranked by team size

Top 25 of 1,356 drilling services contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to drilling services 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	Halliburton	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 16, 2026
2	EXPRO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 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 16, 2026
3	Nabors Industries	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 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 16, 2026
4	Noble Corporation	Strong evidence	Houston, TX, United StatesHQ checked Sep 16, 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 16, 2026
5	NESR	Indirect evidence	Houston, United StatesHQ checked Sep 16, 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 16, 2026
6	Boart Longyear	Partial evidence	West Valley City, UT, United StatesHQ checked Sep 16, 2026	5,001-10,000	3,285 contacts →
	Partial evidence “Established in 1890, Boart Longyear is the world’s leading innovative provider of drilling services, manufacturer of productivity-driven drilling equipment and performance…” Source: RevenueBase Database · checked Sep 16, 2026
7	Valaris Limited	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 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 16, 2026
8	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,755 contacts →
	Indirect evidence “Headquartered in Houston, Texas, Key Energy Services provides a wide array of leading edge energy production solutions and services.” Source: RevenueBase Database · checked Sep 16, 2026
9	Patterson-Uti	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 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 16, 2026
10	OIL States International	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	5,001-10,000	2,215 contacts →
	Indirect evidence “Oil States International, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
11	Superior Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,938 contacts →
	Indirect evidence “For oil & gas exploration and production companies worldwide, Superior Energy Services is an oilfield products and services company with global reach, financial stability and…” Source: RevenueBase Database · checked Sep 16, 2026
12	Dril-Quip	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,387 contacts →
	Indirect evidence “Dril-Quip is part of Innovex, a unique energy industrial platform.” Source: RevenueBase Database · checked Sep 16, 2026
13	Cudd Energy Services	Indirect evidence	The Woodlands, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,285 contacts →
	Indirect evidence “Cudd offers a broad range of technical and specialized oilfield services to companies engaged in the exploration and production of oil and natural gas worldwide.” Source: RevenueBase Database · checked Sep 16, 2026
14	Newpark	Indirect evidence	Katy, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,244 contacts →
	Indirect evidence “Newpark Fluids Systems is the world’s leading pure-play oil & gas and geothermal fluid solutions provider.” Source: RevenueBase Database · checked Sep 16, 2026
15	Stewart & Stevenson	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,135 contacts →
	Indirect evidence “Stewart & Stevenson is a leading designer, manufacturer and provider of specialized equipment and aftermarket parts and service for the oil and gas and other industries that we…” Source: RevenueBase Database · checked Sep 16, 2026
16	Scientific Drilling	Partial evidence	The Woodlands, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,134 contacts →
	Partial evidence “THE ULTIMATE PARTNER IN WELLBORE PLACEMENT Scientific Drilling International is an independent service provider offering a complete high accuracy wellbore placement and drilling…” Source: RevenueBase Database · checked Sep 16, 2026
17	WIS Wellbore Integrity Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	744 contacts →
	Indirect evidence “Wellbore Integrity Solutions provides superior technologies and global service domain expertise, enabling our customers to enhance the full lifecycle of their wells by solving…” Source: RevenueBase Database · checked Sep 16, 2026
18	Nine Energy Service	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	712 contacts →
	Indirect evidence “With a culture built on high performance and flawless execution, Nine Energy Service is a unique kind of oilfield services company, offering industry-shaping completion solutions…” Source: RevenueBase Database · checked Sep 16, 2026
19	Fesco, LTD	Indirect evidence	Alice, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	651 contacts →
	Indirect evidence “FESCO is a diversified energy services company providing quality equipment and experienced personnel since 1949.” Source: RevenueBase Database · checked Sep 16, 2026
20	Atwood Oceanics	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	639 contacts →
	Indirect evidence “Atwood Oceanics, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
21	Pacific Drilling	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	538 contacts →
	Partial evidence “On April 15, 2021, Noble Corporation plc completed its acquisition of Pacific Drilling Company LLC.” Source: RevenueBase Database · checked Sep 16, 2026
22	Ranger Energy Services, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	501 contacts →
	Indirect evidence “Ranger is one of the largest providers of high specification mobile rig well services, cased hole wireline services, and ancillary services in the U.S.” Source: RevenueBase Database · checked Sep 16, 2026
23	Cactus Drilling CO	Strong evidence	Oklahoma City, OK, United StatesHQ checked Sep 16, 2026	1,001-5,000	440 contacts →
	Strong evidence “As the largest privately-held domestic land drilling contractor in the United States, Cactus provides competent, motivated personnel utilizing premium equipment to meet and exceed…” Source: RevenueBase Database · checked Sep 16, 2026
24	Varel Energy Solutions	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	424 contacts →
	Partial evidence “Founded in 1947, Varel Energy Solutions is one of the world’s largest independent manufacturers and suppliers of downhole drilling and completions products to the energy sector.” Source: RevenueBase Database · checked Sep 16, 2026
25	Express Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	379 contacts →
	Indirect evidence “Express Energy Services, a leading oilfield services company, is active in every major hydrocarbon basin in the United States and is a premier provider of products and services…” Source: RevenueBase Database · checked Sep 16, 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: drilling services 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 drilling services contractors.
Partial evidence: Its own public description names part of drilling services contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name drilling services 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 1,356 drilling services contractors based in the United States

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Drilling services contractors based in the United States at a glance

As of Sep 16, 2026

24.3%Verified-email coverage

104.2Average contacts per company

11-50Median size (employees)

16.2%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

455

11-50

491

51-200

257

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,356 companies.

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 drilling services 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “drilling services 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 drilling services 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 drilling services contractors, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 34,277 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 16, 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.

Drilling services contractors by metro

Drilling services contractors in Houston219
Drilling services contractors in Midland56

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 drilling services 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 drilling services contractors are there based in the United States?

RevenueBase identified 1,356 drilling services contractors headquartered in the United States 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?

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

Which city has the most drilling services contractors?

Houston leads with 219 headquartered companies, followed by Midland (56) and Oklahoma City (24).

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 34,277 verified decision-maker contacts tracked across these 1,356 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 16, 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.