Company lists · Data refreshed September 2026

Top 25 Oil and gas exploration companies worldwide

Name: Oil and gas exploration companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 3,581 companies tracked

RevenueBase identified 3,581 oil and gas exploration companies worldwide as of September 2026 and tracks 381,496 professional contacts across them, including 85,139 with verified work emails and 0 with mobile numbers. The United States is the largest market and Houston the largest hub.

This list covers oil and gas exploration companies 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 oil and gas exploration companies 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

3,581Companies

381,496Contacts tracked

85,139Verified emails

0Mobile numbers

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The 25 largest oil and gas exploration companies worldwide

Ranked by team size

Top 25 of 3,581 oil and gas exploration companies worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to oil and gas exploration 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	Halliburton	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 17, 2026
2	Petronas	Indirect evidence	Kuala Lumpur, MalaysiaHQ checked Sep 17, 2026	10001+	28,095 contacts →
	Indirect evidence “Petroliam Nasional Berhad (PETRONAS) is a leading global energy company committed to powering society’s progress in a responsible and sustainable manner.” Source: RevenueBase Database · checked Sep 17, 2026
3	Conocophillips	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	15,828 contacts →
	Strong evidence “We are a global oil and gas company tasked with an important job-to safely find and deliver energy for the world.” Source: RevenueBase Database · checked Sep 17, 2026
4	Equinor	Indirect evidence	Stavanger, NorwayHQ checked Sep 17, 2026	10001+	14,332 contacts →
	Indirect evidence “We provide reliable energy for a world with growing demand.” Source: RevenueBase Database · checked Sep 17, 2026
5	Petroleum Development Oman	Strong evidence	Muscat, OmanHQ checked Sep 17, 2026	5,001-10,000	12,478 contacts →
	Strong evidence “We are the leading exploration and production company in the Sultanate of Oman that delivers the majority of the country's crude oil production and natural gas supply, but above…” Source: RevenueBase Database · checked Sep 17, 2026
6	Canadian Natural Resources Limited Cnrl	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 17, 2026	10001+	8,992 contacts →
	Indirect evidence “MAKE YOUR MARK WHILE YOU GROW YOUR CAREER At Canadian Natural we believe our employees are the key to unlocking asset potential.” Source: RevenueBase Database · checked Sep 17, 2026
7	Cenovus Energy	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 17, 2026	5,001-10,000	6,379 contacts →
	Indirect evidence “Cenovus Energy Inc.” Source: RevenueBase Database · checked Sep 17, 2026
8	Santos LTD	Indirect evidence	Adelaide, AustraliaHQ checked Sep 17, 2026	1,001-5,000	6,366 contacts →
	Indirect evidence “Our purpose is to provide reliable and affordable energy to help create a better world for everyone.” Source: RevenueBase Database · checked Sep 17, 2026
9	Woodside Energy	Indirect evidence	Perth, AustraliaHQ checked Sep 17, 2026	1,001-5,000	5,559 contacts →
	Indirect evidence “We aim to thrive through the global energy transition with a low-cost, lower-carbon, profitable, resilient and diversified portfolio.” Source: RevenueBase Database · checked Sep 17, 2026
10	W&t Offshore Inc. Nyse WTI	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	n/a	5,489 contacts →
	Strong evidence “We are an independent oil and natural gas acquisition, exploitation and exploration company.” Source: RevenueBase Database · checked Sep 17, 2026
11	Perenco	Partial evidence	Londres, United KingdomHQ checked Sep 17, 2026	5,001-10,000	5,220 contacts →
	Partial evidence “Founded over thirty years ago, Perenco is an independent hydrocarbon producer involved in the entire lifecycle of projects, from exploration to decommissioning.” Source: RevenueBase Database · checked Sep 17, 2026
12	Seadrill	Strong evidence	Houston, United StatesHQ checked Sep 17, 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 17, 2026
13	CEPSA	Indirect evidence	Madrid, SpainHQ checked Sep 17, 2026	10001+	4,646 contacts →
	Indirect evidence “Cepsa is a leading international company committed to sustainable mobility and energy with strong technical expertise after more than 90 years of activity.” Source: RevenueBase Database · checked Sep 17, 2026
14	Hess Corporation	Strong evidence	New York, NY, United StatesHQ checked Sep 17, 2026	1,001-5,000	4,642 contacts →
	Strong evidence “Hess Corporation is a global independent energy company engaged in the exploration and production of crude oil and natural gas.” Source: RevenueBase Database · checked Sep 17, 2026
15	EOG Resources	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	4,346 contacts →
	Indirect evidence “EOG Resources, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
16	PT Elnusa TBK	Strong evidence	Jakarta Selatan, IndonesiaHQ checked Sep 17, 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 17, 2026
17	Murphy OIL Corporation	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	n/a	3,514 contacts →
	Strong evidence “Murphy Oil Corporation is a global independent oil and natural gas exploration and production company.” Source: RevenueBase Database · checked Sep 17, 2026
18	Anadarko Petroleum Corporation	Strong evidence	The Woodlands, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	3,460 contacts →
	Strong evidence “Anadarko is among the world’s largest independent oil and natural gas exploration and production companies, with corporate offices in The Woodlands, Texas.” Source: RevenueBase Database · checked Sep 17, 2026
19	Perbras	Indirect evidence	Catu, BrazilHQ checked Sep 17, 2026	1,001-5,000	2,946 contacts →
	Indirect evidence “A PERBRAS é uma empresa brasileira que atua há 50 anos no mercado de Petróleo e Gás em diversas regiões do Brasil.” Source: RevenueBase Database · checked Sep 17, 2026
20	Pluspetrol	Indirect evidence	Caba, IndiaHQ checked Sep 17, 2026	1,001-5,000	2,764 contacts →
	Indirect evidence “Pluspetrol es una empresa privada de energía con más 45 años de experiencia en la exploración y producción de hidrocarburos.” Source: RevenueBase Database · checked Sep 17, 2026
21	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 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 17, 2026
22	Aker BP ASA	Strong evidence	Lysaker, NorwayHQ checked Sep 17, 2026	1,001-5,000	2,703 contacts →
	Strong evidence “Aker BP explores for and produces oil and gas on the Norwegian continental shelf.” Source: RevenueBase Database · checked Sep 17, 2026
23	Cairn OIL And GAS	Strong evidence	Gurugram, IndiaHQ checked Sep 17, 2026	1,001-5,000	2,585 contacts →
	Strong evidence “Cairn Oil & Gas, part of Vedanta Limited, is India's largest private oil and gas exploration and production company, contributing more than a quarter of India’s domestic crude oil…” Source: RevenueBase Database · checked Sep 17, 2026
24	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
25	Taqa Industrialization & Energy Services Company	Indirect evidence	Dhahran, Saudi ArabiaHQ checked Sep 17, 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 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: oil and gas exploration 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 oil and gas exploration companies.
Partial evidence: Its own public description names part of oil and gas exploration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name oil and gas exploration 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 3,581 oil and gas exploration companies worldwide

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Oil and gas exploration companies worldwide at a glance

As of Sep 17, 2026

22.3%Verified-email coverage

106.5Average contacts per company

11-50Median size (employees)

8.3%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,386

11-50

1,183

51-200

558

201-500

204

501-1,000

1,001-5,000

100

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 oil and gas exploration 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.
Coverage: 23 countries, largest first: the United States, Canada, the United Kingdom, Nigeria, Australia, India, Indonesia, Brazil, the United Arab Emirates, Malaysia and 13 more. Country and city lists for oil and gas exploration companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “oil and gas exploration 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 oil and gas exploration 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 oil and gas exploration companies, 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, 85,139 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.

Oil and gas exploration companies by location

30 lists · largest first

Every Oil and gas exploration companies 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 oil and gas exploration 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 oil and gas exploration companies are there worldwide?

RevenueBase identified 3,581 oil and gas exploration companies 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?

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

Which country has the most oil and gas exploration companies?

The United States leads with 1,463 companies, followed by Canada (332) and the United Kingdom (285). Every oil and gas exploration companies list by country and city is linked on this page.

Which city has the most oil and gas exploration companies?

Houston leads with 297 headquartered companies, followed by Calgary (186) and London (108).

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 85,139 verified decision-maker contacts tracked across these 3,581 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.