Company lists · Data refreshed September 2026

Top 24 Offshore drilling contractors based in the United Kingdom

Name: Offshore drilling contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 166 companies tracked

RevenueBase identified 166 offshore drilling contractors headquartered in the United Kingdom as of September 2026 and tracks 18,382 professional contacts across them, including 3,317 with verified work emails. Aberdeen is the largest hub.

This list covers offshore drilling contractors 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 17, 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 17, 2026 86% judged on-target in blind review

166Companies

18,382Contacts tracked

3,317Verified emails

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The 24 largest offshore drilling contractors based in the United Kingdom

Ranked by team size

Top 24 of 166 offshore drilling contractors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to offshore drilling 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	Ensco PLC	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	5,001-10,000	2,679 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 17, 2026
2	Odfjell Drilling	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,864 contacts →
	Partial evidence “Odfjell Drilling is an international drilling company with around 1,500 employees with operations around the world.” Source: RevenueBase Database · checked Sep 17, 2026
3	Borr Drilling	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,699 contacts →
	Strong evidence “Borr Drilling Limited is an offshore shallow-water drilling contractor providing worldwide offshore drilling services to the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
4	Altera Infrastructure	Partial evidence	Aberdeenshire, United KingdomHQ checked Sep 17, 2026	501-1,000	955 contacts →
	Partial evidence “Altera Infrastructure is a leading global energy infrastructure services group focused on the ownership and operation of offshore energy assets.” Source: RevenueBase Database · checked Sep 17, 2026
5	Dolphin Drilling	Strong evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	201-500	694 contacts →
	Strong evidence “Dolphin Drilling is the offshore drilling pioneer of the past and for the future.” Source: RevenueBase Database · checked Sep 17, 2026
6	Swire Oilfield Services	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	501-1,000	202 contacts →
	Partial evidence “Swire Energy Services, part of the global conglomerate, the Swire group, is the world's largest supplier of specialist offshore cargo carrying units to the global energy industry…” Source: RevenueBase Database · checked Sep 17, 2026
7	Aquaterra Energy	Partial evidence	Norwich, United KingdomHQ checked Sep 17, 2026	51-200	167 contacts →
	Partial evidence “Aquaterra Energy provides intelligently engineered products and services for well access and offshore developments - supporting efficient operations across the full life cycle of…” Source: RevenueBase Database · checked Sep 17, 2026
8	Interocean Marine Services	Partial evidence	Portlethen, United KingdomHQ checked Sep 17, 2026	51-200	134 contacts →
	Partial evidence “Interocean provide a comprehensive range of services to the offshore oil and gas, marine, and renewable sectors.” Source: RevenueBase Database · checked Sep 17, 2026
9	Aquaterra Group LTD	Indirect evidence	Kintore, United KingdomHQ checked Sep 17, 2026	11-50	123 contacts →
	Indirect evidence “RELIABLE \| RESOURCEFUL \| READY We continually raise the bar by challenging ourselves and our clients to enable safe and efficient performance.” Source: RevenueBase Database · checked Sep 17, 2026
10	Hobark International Limited	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	113 contacts →
	Indirect evidence “Hobark International Limited (HIL) is an Integrated Services Company whose subsidiaries: DrillPet International Limited (DIL), Uniterm Nigeria Limited (UNL), UltiProc Nigeria…” Source: RevenueBase Database · checked Sep 17, 2026
11	Derrick Services UK LTD	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 17, 2026	51-200	111 contacts →
	Indirect evidence “Derrick Service UK Ltd (DSL) is a diversified oil & gas construction company which provides a broad range of products and services to the market from our Worldwide locations.” Source: RevenueBase Database · checked Sep 17, 2026
12	Awilco Drilling	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	88 contacts →
	Partial evidence “Awilco Drilling Limited was incorporated in December 2009 in connection with the acquisition of the two semi submersible drilling rigs, WilPhoenix (previously Arctic II) and…” Source: RevenueBase Database · checked Sep 17, 2026
13	RDS	Strong evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	1,001-5,000	70 contacts →
	Strong evidence “RDS is an engineering specialist working for oil and gas companies and major topsides and drilling contractors.” Source: RevenueBase Database · checked Sep 17, 2026
14	Global Resources Network	Indirect evidence	Dyce, United KingdomHQ checked Sep 17, 2026	11-50	63 contacts →
	Indirect evidence “Global Resources supply Drill Crew to the UK and International Oil & Gas Industry Our experience means we understand the need for QUALITY & COMPETENT crew.” Source: RevenueBase Database · checked Sep 17, 2026
15	Aventus Energy	Indirect evidence	Alness, United KingdomHQ checked Sep 17, 2026	11-50	57 contacts →
	Indirect evidence “Aventus Energy Ltd is a recently formed Scottish Highland based company operating from our bespoke premises in Alness.” Source: RevenueBase Database · checked Sep 17, 2026
16	First Marine Solutions	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	55 contacts →
	Indirect evidence “First Marine Solutions is a leading international energy service and equipment organisation with operations worldwide, We provide expertise, technology, techniques and support…” Source: RevenueBase Database · checked Sep 17, 2026
17	Saltire Energy Group	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	51 contacts →
	Partial evidence “Established in 1986, Saltire Energy Group supplies high-quality drilling equipment to the global oil and gas industry from its headquarters in Aberdeen and seven bases around the…” Source: RevenueBase Database · checked Sep 17, 2026
18	Crondall Energy	Partial evidence	Southampton, United KingdomHQ checked Sep 17, 2026	11-50	50 contacts →
	Partial evidence “Crondall Energy is an independent offshore energy consultancy specialising in floating and subsea facilities.” Source: RevenueBase Database · checked Sep 17, 2026
19	KD Marine LTD	Strong evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	11-50	48 contacts →
	Strong evidence “KD Marine are a commercial diving contractor providing underwater intervention services to the offshore oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
20	RIG Surveys Group	Strong evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	37 contacts →
	Strong evidence “We are a dynamic team with over 20 years experience servicing the Mobile Offshore Drilling Unit market around the World.” Source: RevenueBase Database · checked Sep 17, 2026
21	Gorevega	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	37 contacts →
	Partial evidence “GoreVega supports the global oil and gas industry by providing valuable technical expertise for operators and service companies at each stage of a well’s lifecycle, from drilling…” Source: RevenueBase Database · checked Sep 17, 2026
22	Seatronics LTD	Indirect evidence	Westhill, United KingdomHQ checked Sep 17, 2026	51-200	37 contacts →
	Indirect evidence “Seatronics is now part of Ashtead Technology.” Source: RevenueBase Database · checked Sep 17, 2026
23	TIS Manufacturing	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	11-50	33 contacts →
	Indirect evidence “TIS Manufacturing is a specialist in the design, manufacture, refurbishment and rental of well service and subsea control equipment for the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
24	Indepth International	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	30 contacts →
	Partial evidence “Our global organic talent allows us to deliver specialized knowledge and solutions for offshore operations to our clients around the world.” 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: offshore drilling 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 offshore drilling contractors.
Partial evidence: Its own public description names part of offshore drilling contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore drilling 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 24 of 166 offshore drilling contractors based in the United Kingdom

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Offshore drilling contractors based in the United Kingdom at a glance

As of Sep 17, 2026

18.0%Verified-email coverage

110.7Average contacts per company

11-50Median size (employees)

25.9%Largest-city concentration · Aberdeen

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 166 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 offshore drilling 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 Kingdom whose own description of what they do matches “offshore drilling 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 offshore drilling 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 offshore drilling contractors, 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, 3,317 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.

Offshore drilling contractors by metro

Offshore drilling contractors in Aberdeen43
Offshore drilling contractors in London33

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 offshore drilling 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 offshore drilling contractors are there based in the United Kingdom?

RevenueBase identified 166 offshore drilling contractors 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?

Ensco PLC, headquartered in London, tops this list with the largest team on record.

Which city has the most offshore drilling contractors?

Aberdeen leads with 43 headquartered companies, followed by London (33) and Portlethen (4).

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 3,317 verified decision-maker contacts tracked across these 166 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.