Company lists · Data refreshed September 2026

Top 25 Upstream oil and gas IT services worldwide

Name: Upstream oil and gas IT services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 9,708 companies tracked

RevenueBase identified 9,708 upstream oil and gas IT services worldwide as of September 2026 and tracks 539,272 professional contacts across them, including 119,493 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers upstream oil and gas IT services 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 29, 2026. Country and city lists for upstream oil and gas IT services 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 29, 2026 86% judged on-target in blind review

9,708Companies

539,272Contacts tracked

119,493Verified emails

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The 25 largest upstream oil and gas IT services worldwide

Ranked by team size

Top 25 of 9,708 upstream oil and gas IT services worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to upstream oil and gas IT services: 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	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	10001+	76,561 contacts →
	Indirect evidence “SLB is a global technology company that has driven energy innovation for more than a century.” Source: RevenueBase Database · checked Sep 29, 2026
2	Halliburton	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 29, 2026
3	NOV	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	10001+	29,577 contacts →
	Indirect evidence “NOV delivers technology-driven solutions to empower the global energy industry.” Source: RevenueBase Database · checked Sep 29, 2026
4	Aker Solutions	Indirect evidence	Fornebu, NorwayHQ checked Sep 29, 2026	10001+	15,774 contacts →
	Indirect evidence “Aker Solutions is a global engineering and technology company known for delivering complex energy projects with trusted quality and predictable results.” Source: RevenueBase Database · checked Sep 29, 2026
5	Technip Former Company	Indirect evidence	United KingdomHQ checked Sep 29, 2026	10001+	11,255 contacts →
	Indirect evidence “Technip is a former company that was separated into two independent companies: TechnipFMC and Technip Energies, which now operate with no capital ties.” Source: RevenueBase Database · checked Sep 29, 2026
6	EXPRO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 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 29, 2026
7	Nabors Industries	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 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 29, 2026
8	Seadrill	Strong evidence	Houston, United StatesHQ checked Sep 29, 2026	1,001-5,000	4,845 contacts →
	Strong evidence “Seadrill is setting the standard in deepwater oil and gas drilling.” Source: RevenueBase Database · checked Sep 29, 2026
9	PT Elnusa TBK	Strong evidence	Jakarta Selatan, IndonesiaHQ checked Sep 29, 2026	1,001-5,000	3,932 contacts →
	Strong 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 29, 2026
10	NESR	Indirect evidence	Houston, United StatesHQ checked Sep 29, 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 29, 2026
11	ADES	Strong evidence	Al Khobar, Saudi ArabiaHQ checked Sep 29, 2026	5,001-10,000	3,251 contacts →
	Strong evidence “ADES is a world-leading international provider of oil and gas drilling services.” Source: RevenueBase Database · checked Sep 29, 2026
12	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 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 29, 2026
13	Precision Drilling	Strong evidence	Calgary, AB, CanadaHQ checked Sep 29, 2026	5,001-10,000	2,471 contacts →
	Strong 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 29, 2026
14	OCYAN	Partial evidence	Rio De Janeiro, BrazilHQ checked Sep 29, 2026	1,001-5,000	2,427 contacts →
	Partial 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 29, 2026
15	Archer	Indirect evidence	Sandnes, NorwayHQ checked Sep 29, 2026	5,001-10,000	2,373 contacts →
	Indirect evidence “Archer is a company providing drilling and well services to the global energy industry.” Source: RevenueBase Database · checked Sep 29, 2026
16	Taqa Industrialization & Energy Services Company	Indirect evidence	Dhahran, Saudi ArabiaHQ checked Sep 29, 2026	5,001-10,000	2,250 contacts →
	Indirect evidence “TAQA is an international company that offers leading well solutions for the energy industry and is creating value and opportunity for all its stakeholders.” Source: RevenueBase Database · checked Sep 29, 2026
17	Oilserv	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 29, 2026	1,001-5,000	2,249 contacts →
	Indirect 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 29, 2026
18	OIL States International	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	5,001-10,000	2,215 contacts →
	Partial evidence “Oil States International, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
19	SAN Antonio Internacional	Indirect evidence	Comuna 1, ArgentinaHQ checked Sep 29, 2026	1,001-5,000	2,064 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 29, 2026
20	Sinopec International Petroleum Service Corporation	Indirect evidence	北京市, ChinaHQ checked Sep 29, 2026	10001+	1,952 contacts →
	Indirect evidence “Sinopec International Petroleum Service Corporation SSC” Source: RevenueBase Database · checked Sep 29, 2026
21	Superior Energy Services	Strong evidence	Houston, TX, United StatesHQ checked Sep 29, 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 29, 2026
22	ZMI Holdings	Indirect evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 29, 2026	1,001-5,000	1,917 contacts →
	Indirect evidence “ZMI Holdings an ADNOC L&S company THE NEW WAVE Transforming the Offshore Energy Industry An integrated service provider offering unparalleled commitment.” Source: RevenueBase Database · checked Sep 29, 2026
23	TGS	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,775 contacts →
	Indirect evidence “TGS provides advanced data and intelligence to companies active in the energy sector.” Source: RevenueBase Database · checked Sep 29, 2026
24	Geolog International	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 29, 2026	1,001-5,000	1,685 contacts →
	Indirect evidence “Every year, drilling teams make decisions worth millions of dollars on incomplete information.” Source: RevenueBase Database · checked Sep 29, 2026
25	Pertamina Hulu Rokan	Indirect evidence	Jakarta, IndonesiaHQ checked Sep 29, 2026	1,001-5,000	1,647 contacts →
	Indirect evidence “PT Pertamina Hulu Rokan (PHR) is a subsidiary of PT Pertamina Hulu Energi (PHE)” Source: RevenueBase Database · checked Sep 29, 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 IT services. 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 IT services.
Partial evidence: Its own public description names part of upstream oil and gas IT services, 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 IT services. 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 9,708 upstream oil and gas IT services worldwide

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Upstream oil and gas IT services worldwide at a glance

As of Sep 29, 2026

22.2%Verified-email coverage

55.5Average contacts per company

11-50Median size (employees)

6.6%Largest-city concentration · Houston

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

3,288

11-50

3,324

51-200

1,919

201-500

616

501-1,000

242

1,001-5,000

223

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 upstream oil and gas IT services, 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 upstream oil and gas IT services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “upstream oil and gas IT services”. 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 IT services), 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 IT services, 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, 119,493 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 29, 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 IT services by location

64 lists · largest first

Every Upstream oil and gas IT services 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 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 IT services, 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 IT services are there worldwide?

RevenueBase identified 9,708 upstream oil and gas IT services 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?

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

Which country has the most upstream oil and gas IT services?

The United States leads with 2,756 companies, followed by Nigeria (604) and Canada (565). Every upstream oil and gas IT services list by country and city is linked on this page.

Which city has the most upstream oil and gas IT services?

Houston leads with 637 headquartered companies, followed by Calgary (300) and Port Harcourt (168).

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 119,493 verified decision-maker contacts tracked across these 9,708 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 29, 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.