Company lists · Data refreshed September 2026

Top 25 Offshore drilling support services based in the United Kingdom

Name: Offshore drilling support services 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 369 companies tracked

RevenueBase identified 369 offshore drilling support services headquartered in the United Kingdom as of September 2026 and tracks 23,676 professional contacts across them, including 5,034 with verified work emails. Aberdeen is the largest hub.

This list covers offshore drilling support services 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

369Companies

23,676Contacts tracked

5,034Verified emails

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The 25 largest offshore drilling support services based in the United Kingdom

Ranked by team size

Top 25 of 369 offshore drilling support services 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 offshore drilling support 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	Ensco PLC	Indirect evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
2	Odfjell Drilling	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 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 20, 2026
3	Borr Drilling	Strong evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
4	Altera Infrastructure	Partial evidence	Aberdeenshire, United KingdomHQ checked Sep 20, 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 20, 2026
5	Dolphin Drilling	Strong evidence	Aberdeen, United KingdomHQ checked Sep 20, 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 20, 2026
6	Gardline Limited	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 20, 2026	501-1,000	545 contacts →
	Indirect evidence “Gardline is a best-in-class provider of geophysical, geotechnical and environmental marine surveys.” Source: RevenueBase Database · checked Sep 20, 2026
7	Boskalis Subsea Services	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	201-500	516 contacts →
	Partial evidence “Boskalis Subsea Services is a world-leading provider of specialist subsea solutions for the offshore energy industry, seamlessly integrating services to deliver optimum results.” Source: RevenueBase Database · checked Sep 20, 2026
8	Briggs Marine	Partial evidence	Burntisland, United KingdomHQ checked Sep 20, 2026	501-1,000	387 contacts →
	Partial evidence “Briggs Marine is a leading provider of marine and environmental services, specialising in port and marine operations, subsea and environmental support and vessel charter.” Source: RevenueBase Database · checked Sep 20, 2026
9	Ashtead Technology	Indirect evidence	Westhill, United KingdomHQ checked Sep 20, 2026	501-1,000	368 contacts →
	Indirect evidence “Established in 1985, Ashtead Technology has grown organically and through strategic acquisition to become the leading provider of equipment rental solutions, advanced underwater…” Source: RevenueBase Database · checked Sep 20, 2026
10	Swire Energy Services	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	501-1,000	284 contacts →
	Partial evidence “Swire Energy Services is a global provider of services supporting the energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
11	Cyan Sentinel Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	51-200	249 contacts →
	Indirect evidence “An International Shipowning and Marine Investment Company.” Source: RevenueBase Database · checked Sep 20, 2026
12	Acteon	Partial evidence	Norwich, United KingdomHQ checked Sep 20, 2026	1,001-5,000	192 contacts →
	Partial evidence “Acteon delivers data-driven, engineering-led solutions across the lifecycle of offshore energy infrastructure.” Source: RevenueBase Database · checked Sep 20, 2026
13	Fletcher	Strong evidence	Portlethen, United KingdomHQ checked Sep 20, 2026	201-500	184 contacts →
	Strong evidence “Fletcher operate and manage a modern fleet of Offshore Platform Supply Vessels, employing over 300 people to support our operations.” Source: RevenueBase Database · checked Sep 20, 2026
14	Aquaterra Energy	Strong evidence	Norwich, United KingdomHQ checked Sep 20, 2026	51-200	167 contacts →
	Strong 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 20, 2026
15	Seatec	Partial evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	201-500	155 contacts →
	Partial evidence “SeaTec provides a comprehensive range of services and products to meet the needs of the shipping, offshore and defence industries.” Source: RevenueBase Database · checked Sep 20, 2026
16	Seatrium Offshore Renewable Services LTD	Partial evidence	Lowestoft, United KingdomHQ checked Sep 20, 2026	n/a	155 contacts →
	Partial evidence “Seatrium Offshore Renewable Services Ltd (Seatrium ORS) has over 55 years of unparalleled expertise and experience in the offshore energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
17	Interocean Marine Services	Partial evidence	Portlethen, United KingdomHQ checked Sep 20, 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 20, 2026
18	Hobark International Limited	Indirect evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
19	Derrick Services UK LTD	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 20, 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 20, 2026
20	James Fisher Offshore	Strong evidence	Oldmeldrum, United KingdomHQ checked Sep 20, 2026	51-200	107 contacts →
	Strong evidence “James Fisher Offshore (JFO) is an international supplier of marine back deck, specialist subsea equipment and engineering services supporting the global subsea contractors across…” Source: RevenueBase Database · checked Sep 20, 2026
21	Andrews Survey	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	51-200	88 contacts →
	Partial evidence “Andrews Survey is predominantly active in construction and trenching support, ROV pipeline inspection support, renewable energy and wind-farm installation support and rig…” Source: RevenueBase Database · checked Sep 20, 2026
22	Awilco Drilling	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 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 20, 2026
23	Shearwater Marine Services	Indirect evidence	Sandbank, United KingdomHQ checked Sep 20, 2026	51-200	87 contacts →
	Indirect evidence “Founded in 1992, Shearwater Marine Services have since grown to become a highly respected topside and sub-surface marine engineering service provider.” Source: RevenueBase Database · checked Sep 20, 2026
24	Holyhead Towing Co. LTD	Indirect evidence	Holyhead, United KingdomHQ checked Sep 20, 2026	51-200	75 contacts →
	Indirect evidence “Holyhead Towing Company (Est.” Source: RevenueBase Database · checked Sep 20, 2026
25	Cpower Energy LTD	Partial evidence	Colchester, United KingdomHQ checked Sep 20, 2026	n/a	72 contacts →
	Partial evidence “CPower Energy was set up in August 2015 to service a wide variety of jobs within both the Construction and O&M phase of Onshore and Offshore Windfarms.” 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: offshore drilling support 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 offshore drilling support services.
Partial evidence: Its own public description names part of offshore drilling support services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore drilling support 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 369 offshore drilling support services based in the United Kingdom

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Offshore drilling support services based in the United Kingdom at a glance

As of Sep 20, 2026

21.3%Verified-email coverage

64.2Average contacts per company

11-50Median size (employees)

19.5%Largest-city concentration · Aberdeen

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

169

11-50

101

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 369 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 support 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.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “offshore drilling support 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 offshore drilling support 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 offshore drilling support services, 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, 5,034 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.

Offshore drilling support services by metro

Offshore drilling support services in Aberdeen72
Offshore drilling support services in London44

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 support 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 offshore drilling support services are there based in the United Kingdom?

RevenueBase identified 369 offshore drilling support services 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 support services?

Aberdeen leads with 72 headquartered companies, followed by London (44) and Lowestoft (6).

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 5,034 verified decision-maker contacts tracked across these 369 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.