Company lists · Data refreshed September 2026

Top 25 Upstream oil and gas technology companies based in Houston, United States

Name: Upstream oil and gas technology companies based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 522 companies tracked

RevenueBase identified 522 upstream oil and gas technology companies headquartered in Houston, United States as of September 2026 and tracks 296,788 professional contacts across them, including 90,028 with verified work emails. Houston is the largest hub.

This list covers upstream oil and gas technology companies headquartered in Houston, 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 19, 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 19, 2026 86% judged on-target in blind review

522Companies

296,788Contacts tracked

90,028Verified emails

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The 25 largest upstream oil and gas technology companies based in Houston, United States

Ranked by team size

Top 25 of 522 upstream oil and gas technology companies based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to upstream oil and gas technology companies: 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	SLB	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	76,561 contacts →
	Partial evidence “SLB is a global technology company that has driven energy innovation for more than a century.” Source: RevenueBase Database · checked Sep 19, 2026
2	Baker Hughes	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	61,166 contacts →
	Partial evidence “Baker Hughes (NASDAQ: BKR) is an energy technology company that provides solutions for energy and industrial customers worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
3	Halliburton	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 19, 2026
4	NOV	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	29,577 contacts →
	Partial evidence “NOV delivers technology-driven solutions to empower the global energy industry.” Source: RevenueBase Database · checked Sep 19, 2026
5	EXPRO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
6	Nabors Industries	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	5,865 contacts →
	Partial evidence “Nabors Industries is a leading provider of advanced technology for the energy industry.” Source: RevenueBase Database · checked Sep 19, 2026
7	FMC Technologies	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	4,749 contacts →
	Partial evidence “FMC Technologies is now TechnipFMC.” Source: RevenueBase Database · checked Sep 19, 2026
8	NESR	Indirect evidence	Houston, United StatesHQ checked Sep 19, 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 19, 2026
9	Valaris Limited	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
10	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
11	Patterson-Uti	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	2,317 contacts →
	Strong 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 19, 2026
12	OIL States International	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	5,001-10,000	2,215 contacts →
	Partial evidence “Oil States International, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
13	Superior Energy Services	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,938 contacts →
	Strong 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 19, 2026
14	Core Laboratories	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,500 contacts →
	Partial evidence “With over 70 offices in more than 50 countries located in major oil-producing provinces, Core Laboratories provides services to the world's major, national, and independent oil…” Source: RevenueBase Database · checked Sep 19, 2026
15	Dril-Quip	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
16	Stewart & Stevenson	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,135 contacts →
	Strong 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 19, 2026
17	KLX Energy Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	857 contacts →
	Partial evidence “KLX Energy Services provides more than 100 mission-critical oilfield services, tools, technologies and equipment to some of the industry’s leading operators.” Source: RevenueBase Database · checked Sep 19, 2026
18	LMKR	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	777 contacts →
	Partial evidence “Founded in 1994 and built on a strong geoscience and data management footprint, LMKR has evolved into a premier technology company expanding its reach to Clean Energy…” Source: RevenueBase Database · checked Sep 19, 2026
19	Nine Energy Service	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
20	Cactus Wellhead	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	703 contacts →
	Indirect evidence “Cactus designs, manufactures, sells and rents a range of highly-engineered wellheads and pressure control equipment.” Source: RevenueBase Database · checked Sep 19, 2026
21	Worldwide Oilfield Machine	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	635 contacts →
	Indirect evidence “Worldwide Oilfield Machine (WOM) is a multinational equipment manufacturer specializing in solutions for drilling, testing, production and intervention operations.” Source: RevenueBase Database · checked Sep 19, 2026
22	Pacific Drilling	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	538 contacts →
	Indirect evidence “On April 15, 2021, Noble Corporation plc completed its acquisition of Pacific Drilling Company LLC.” Source: RevenueBase Database · checked Sep 19, 2026
23	Cetco Energy Services	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	499 contacts →
	Strong evidence “CETCO Energy Services (CETCO) specializes in treating complex fluids for offshore oil and gas operators.” Source: RevenueBase Database · checked Sep 19, 2026
24	Varel Energy Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	424 contacts →
	Indirect 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 19, 2026
25	Enervest, LTD	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	424 contacts →
	Strong evidence “EnerVest is a top-tier, low-cost oil and natural gas operating company.” Source: RevenueBase Database · checked Sep 19, 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: upstream oil and gas technology companies. 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 upstream oil and gas technology companies.
Partial evidence: Its own public description names part of upstream oil and gas technology companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name upstream oil and gas technology companies. 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 522 upstream oil and gas technology companies based in Houston, United States

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Upstream oil and gas technology companies based in Houston, United States at a glance

As of Sep 19, 2026

30.3%Verified-email coverage

568.6Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

165

11-50

181

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 522 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 upstream oil and gas technology companies, 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 Houston, United States whose own description of what they do matches “upstream oil and gas technology companies”. 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 upstream oil and gas technology companies), 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 upstream oil and gas technology companies, and records with no verified work email. Companies headquartered outside Houston 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, 90,028 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 19, 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.

Upstream oil and gas technology companies by metro in the United States

Upstream oil and gas technology companies in Houston522
Upstream oil and gas technology companies in Midland78
Upstream oil and gas technology companies in Oklahoma City54
Upstream oil and gas technology companies in Dallas44
Upstream oil and gas technology companies in Denver43
Upstream oil and gas technology companies in Odessa41
Upstream oil and gas technology companies in The Woodlands38
Upstream oil and gas technology companies in Austin31
Upstream oil and gas technology companies in Katy29
Upstream oil and gas technology companies in Conroe28
Upstream oil and gas technology companies in Lafayette28
Upstream oil and gas technology companies in Spring27
Upstream oil and gas technology companies in Tulsa27

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 upstream oil and gas technology companies, 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 upstream oil and gas technology companies are there based in Houston, United States?

RevenueBase identified 522 upstream oil and gas technology companies headquartered in Houston, 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?

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

Which city has the most upstream oil and gas technology companies?

Houston leads with 522 headquartered companies, followed by Midland (78) and Oklahoma City (54).

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 90,028 verified decision-maker contacts tracked across these 522 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 19, 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.