Company lists · Data refreshed September 2026

Top 25 Petroleum exploration companies based in the United Kingdom

Name: Petroleum exploration companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 131 companies tracked

RevenueBase identified 131 petroleum exploration companies headquartered in the United Kingdom as of September 2026 and tracks 10,546 professional contacts across them, including 2,538 with verified work emails. London is the largest hub.

This list covers petroleum exploration companies headquartered in the United Kingdom, 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 20, 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 20, 2026 86% judged on-target in blind review

131Companies

10,546Contacts tracked

2,538Verified emails

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The 25 largest petroleum exploration companies based in the United Kingdom

Ranked by team size

Top 25 of 131 petroleum exploration companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to petroleum 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	Harbour Energy	Indirect evidence	Victoria, United KingdomHQ checked Sep 20, 2026	1,001-5,000	2,216 contacts →
	Indirect evidence “The largest independent oil and gas company listed on the London Stock Exchange.” Source: RevenueBase Database · checked Sep 20, 2026
2	Tullow OIL	Partial evidence	Chiswick, United KingdomHQ checked Sep 20, 2026	501-1,000	1,333 contacts →
	Partial evidence “Tullow is an independent oil & gas, exploration and production group focused on its core producing assets in Ghana and is quoted on the London and Ghanaian stock exchanges…” Source: RevenueBase Database · checked Sep 20, 2026
3	Cairn Energy PLC	Partial evidence	Edinburgh, United KingdomHQ checked Sep 20, 2026	201-500	927 contacts →
	Partial evidence “Cairn Energy PLC ('Cairn') is one of Europe's leading independent oil and gas exploration and production companies and is listed on the London Stock Exchange.” Source: RevenueBase Database · checked Sep 20, 2026
4	Assala Energy	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	655 contacts →
	Partial evidence “Assala Energy is an oil exploration and production company.” Source: RevenueBase Database · checked Sep 20, 2026
5	Energean	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	587 contacts →
	Indirect evidence “Established in 2007, Energean is a London-listed FTSE 250 and Tel Aviv-listed TA-90 E&P company with operations in the Europe, Middle East and Africa (“EMEA”) region.” Source: RevenueBase Database · checked Sep 20, 2026
6	Dana Petroleum Limited	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	501-1,000	427 contacts →
	Partial evidence “We're an international oil and gas company with exploration and production activities in the UK, Egypt and The Netherlands.” Source: RevenueBase Database · checked Sep 20, 2026
7	Northern Petroleum PLC	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	n/a	314 contacts →
	Strong evidence “Northern Petroleum is an oil and gas exploration and production company quoted on the AIM Market of the London Stock Exchange.” Source: RevenueBase Database · checked Sep 20, 2026
8	Serica Energy PLC	Indirect evidence	Anderson Drive, United KingdomHQ checked Sep 20, 2026	201-500	271 contacts →
	Indirect evidence “Serica is an AIM-listed, UK-based independent upstream oil and gas company with a balanced portfolio, delivering from multiple hubs and their associated subsea infrastructure in…” Source: RevenueBase Database · checked Sep 20, 2026
9	Ophir-Energy	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	79 contacts →
	Partial evidence “Ophir Energy plc (Ophir) is an independent upstream oil and gas exploration and production company focused on Africa and Asia.” Source: RevenueBase Database · checked Sep 20, 2026
10	JKX OIL & GAS	Indirect evidence	Marylebone, United KingdomHQ checked Sep 20, 2026	501-1,000	47 contacts →
	Indirect evidence “JKX Oil & Gas plc.” Source: RevenueBase Database · checked Sep 20, 2026
11	Panoro Energy	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	41 contacts →
	Indirect evidence “Panoro Energy ASA is an independent E&P company based in London and listed on the Oslo Stock Exchange with ticker PEN.” Source: RevenueBase Database · checked Sep 20, 2026
12	Aminex PLC	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	n/a	36 contacts →
	Partial evidence “Aminex is an Africa-focused oil and gas company with near term production, development and high impact exploration, listed on the London Stock Exchange and primary-listed on the…” Source: RevenueBase Database · checked Sep 20, 2026
13	Pharos Energy	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “Pharos Energy is an independent energy company listed on the main market of the London Stock Exchange focused on delivering sustainable growth and returns to stakeholders, with a…” Source: RevenueBase Database · checked Sep 20, 2026
14	Heritage OIL Limited	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	26 contacts →
	Partial evidence “Heritage Oil Limited is an independent and privately owned oil & gas exploration and operating company” Source: RevenueBase Database · checked Sep 20, 2026
15	NEW AGE African Global Energy Limited	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	25 contacts →
	Indirect evidence “New Age (African Global Energy) Limited is a privately held oil and gas company with a portfolio of quality assets in seven countries, mostly in sub-Saharan Africa, a highly…” Source: RevenueBase Database · checked Sep 20, 2026
16	Bowleven PLC	Indirect evidence	London Bridge, United KingdomHQ checked Sep 20, 2026	1-10	22 contacts →
	Indirect evidence “Bowleven plc is an Africa-focused, oil & gas company, dedicated to realising material shareholder value from its assets in Cameroon, whilst maintaining capital discipline and…” Source: RevenueBase Database · checked Sep 20, 2026
17	Corcel PLC	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	18 contacts →
	Indirect evidence “Corcel is an independent upstream oil and gas company focused on emerging opportunities across Africa and LATAM.” Source: RevenueBase Database · checked Sep 20, 2026
18	Gulfsands	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	16 contacts →
	Indirect evidence “Gulfsands is an independent, public energy company, incorporated in the United Kingdom focused on growth in the Middle East and North Africa region.” Source: RevenueBase Database · checked Sep 20, 2026
19	Impact OIL & GAS	Partial evidence	Uk, United KingdomHQ checked Sep 20, 2026	11-50	16 contacts →
	Partial evidence “Impact is a frontier exploration company with early-stage, deep water prospective hydrocarbon plays that are of sufficient size to attract Oil Majors as partners ahead of drilling.” Source: RevenueBase Database · checked Sep 20, 2026
20	Octavia Energy	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	15 contacts →
	Partial evidence “Octavia is a private oil and gas exploration and production company with a head office in London and subsidiary offices in Cairo.” Source: RevenueBase Database · checked Sep 20, 2026
21	Angus Energy PLC	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	13 contacts →
	Partial evidence “Angus Energy is an independent UK onshore oil and gas company with deep experience in exploration, production and development.” Source: RevenueBase Database · checked Sep 20, 2026
22	Surestream Petroleum Limited	Strong evidence	Reading, United KingdomHQ checked Sep 20, 2026	11-50	13 contacts →
	Strong evidence “Surestream Petroleum is an independent, UK-based, oil exploration company that was founded in September 2004 by the present management team with the aim to build a balanced and…” Source: RevenueBase Database · checked Sep 20, 2026
23	Petroxin	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	13 contacts →
	Indirect evidence “PETROXIN is an international upstream oil and gas company providing technical expertise and cost-effective full life-cycle integrated solutions to global clients of operators and…” Source: RevenueBase Database · checked Sep 20, 2026
24	Europa OIL & GAS PLC	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	12 contacts →
	Partial evidence “Europa Oil & Gas (Holdings) plc is an AIM quoted UK, Ireland and West Africa focused oil and gas exploration, development and production company.” Source: RevenueBase Database · checked Sep 20, 2026
25	Egdon Resources Limited	Partial evidence	United KingdomHQ checked Sep 20, 2026	1-10	12 contacts →
	Partial evidence “Private oil and gas exploration company focused on the UK onshore.” Source: RevenueBase Database · checked Sep 20, 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: petroleum 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 petroleum exploration companies.
Partial evidence: Its own public description names part of petroleum exploration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name petroleum 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 131 petroleum exploration companies based in the United Kingdom

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Petroleum exploration companies based in the United Kingdom at a glance

As of Sep 20, 2026

24.1%Verified-email coverage

80.5Average contacts per company

11-50Median size (employees)

54.2%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 131 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 petroleum 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.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “petroleum 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 petroleum 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 petroleum exploration companies, and records with no verified work email. Companies headquartered outside United Kingdom 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, 2,538 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 20, 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.

Petroleum exploration companies by metro

Petroleum exploration companies in London71

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 petroleum 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 petroleum exploration companies are there based in the United Kingdom?

RevenueBase identified 131 petroleum exploration companies headquartered in the United Kingdom 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?

Harbour Energy, headquartered in Victoria, tops this list with the largest team on record.

Which city has the most petroleum exploration companies?

London leads with 71 headquartered companies, followed by Aberdeen (12) and Bath (2).

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 2,538 verified decision-maker contacts tracked across these 131 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 20, 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.